CN107548144B - A method and device for downlink power control applied to NB-IoT - Google Patents
A method and device for downlink power control applied to NB-IoT Download PDFInfo
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Abstract
本发明实施例公开了一种应用于NB‑IoT的下行功率控制方法及设备，涉及通信技术领域，可以在不缩短NB‑IoT的覆盖范围，即保证数据能够正常传输的同时，降低邻区对处于小区边缘的终端的干扰。具体方案为：第一基站接收终端发送的控制信息，该控制信息中包含有信号参数，该信号参数包括第一RSRP和SINR；第一基站根据第一RSRP和SINR，判断终端所处的区域；第一基站根据终端所处的区域，确定分配给NB‑IoT的频带的目标发射功率。本发明实施例可以应用于基站控制分配给NB‑IoT的频带的发射功率的过程中。
The embodiment of the present invention discloses a downlink power control method and device applied to NB-IoT, which relates to the field of communication technologies, and can reduce the number of adjacent cells without shortening the coverage of NB-IoT, that is, while ensuring that data can be transmitted normally. Interference from terminals at the cell edge. The specific scheme is: the first base station receives control information sent by the terminal, the control information includes signal parameters, and the signal parameters include the first RSRP and SINR; the first base station determines the area where the terminal is located according to the first RSRP and SINR; The first base station determines the target transmit power of the frequency band allocated to the NB-IoT according to the area where the terminal is located. The embodiments of the present invention can be applied to the process in which the base station controls the transmit power of the frequency band allocated to the NB-IoT.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a downlink power control method and equipment applied to NB-IoT.
Background
Narrow-Band cellular Internet of Things (Narrow Band-Internet of Things, NB-IOT) is an emerging technology in the field of Internet of Things, has the characteristics of high capacity, wide coverage, low power consumption, low cost, high stability and the like, can well solve the bottleneck of the traditional Internet of Things communication technology (for example, the short-distance communication technology has a limited coverage range, and the 2/3/4G long-distance cellular communication technology has high power consumption and high cost), and is one of the main connection technologies of the Internet of Things.
In order to increase the deep coverage performance, the NB-IoT enhances the signal coverage gain by 20dB compared with a Global System for Mobile Communication (GSM) through a narrow band and a retransmission technology, the coverage area is enlarged by 100 times, the NB-IoT can cover scenes such as basements, underground garages, underground pipelines and the like, and the application requirements of users such as meter reading and pipeline detection are met.
However, the deep coverage of NB-IoT has introduced new problems while meeting the access requirements of basements, underground pipelines, and other scenes: the 20dB enhancement causes the cross-area coverage and adjacent cell interference, which may occupy the Long Term Evolution (LTE) in-band resource, and the NB-IoT frequency points interfere with each other, thereby affecting the performance of the LTE system.
Therefore, the prior art only meets the requirements of deep coverage of basements, underground pipelines and the like, and does not consider the condition that coverage enhancement causes interference to adjacent cells. This may cause the terminal to be interfered by the base station of the neighboring cell at the cell edge, thereby affecting the service performance.
Disclosure of Invention
The application provides a downlink power control method and device applied to NB-IoT, which can reduce the interference of adjacent cells to a terminal at the edge of a cell while not shortening the coverage of the NB-IoT, namely ensuring normal transmission of data.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect of the present application, a downlink power control method applied to NB-IoT is provided, where the method includes: the first base station receives control information sent by a terminal, wherein the control information comprises Signal parameters, and the Signal parameters comprise first Reference Signal Receiving Power (RSRP) and Signal-to-Noise Ratio (SINR); the first base station judges the area of the terminal according to the first RSRP and the SINR; the first base station determines the target transmission power of the frequency band allocated to the NB-IoT according to the area where the terminal is located.
In this application, the first base station may determine, according to the control information sent by the terminal, a region where the terminal is located, and determine, according to the region where the terminal is located, a target transmission power of a frequency band allocated to the NB-IoT. The target transmission power of the frequency band allocated to the NB-IoT by the first base station is different due to different areas where the terminals are located; when the first base station performs data interaction with terminals in different areas, different target transmitting powers are adopted, so that the coverage of NB-IoT can not be shortened, namely, normal transmission of data can be ensured; meanwhile, when the terminal is at the edge of the cell covered by the first base station, the interference of the adjacent cell to the terminal at the edge of the cell is reduced.
In a second aspect of the present application, there is provided a first base station, including: the device comprises a receiving unit, a judging unit and a determining unit. The receiving unit is configured to receive control information sent by a terminal, where the control information includes signal parameters, and the signal parameters include a first RSRP and an SINR. And the judging unit is used for judging the area where the terminal is located according to the first RSRP and the SINR. And the determining unit is used for determining the target transmitting power of the frequency band allocated to the NB-IoT according to the area where the terminal is located.
It should be noted that each functional unit of the second aspect and various possible implementations of the second aspect of the embodiment of the present invention is a logical partition performed on the first base station in order to execute the NB-IoT downlink power control method according to the first aspect and various optional manners of the first aspect. For a detailed description and a beneficial effect analysis of each functional unit of the second aspect and various possible implementations thereof, reference may be made to the corresponding description and technical effects in the first aspect and various possible implementations thereof, which are not described herein again.
In a third aspect of the present application, a first base station is provided, and the first base station may include: a processor, a memory, and a communication interface. The memory is configured to store computer-executable instructions, and the processor and the communication interface are connected to the memory through a bus, and when the first base station runs, the processor executes the computer-executable instructions stored in the memory, so that the first base station performs the downlink power control method applied to the NB-IoT according to the first aspect and the various alternatives of the first aspect.
In a fourth aspect of the present application, a computer-readable storage medium is provided, which includes computer instructions, when the computer instructions are executed on a computer, the computer is caused to execute the downlink power control method applied to NB-IoT according to the first aspect and the various alternatives of the first aspect.
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 obvious that the drawings in the following description are only some embodiments of the present invention. For a person skilled in the art, other figures can also be obtained from these figures without inventive exercise.
FIG. 1 is a system architecture diagram according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of a first base station according to an embodiment of the present invention;
fig. 3 is a first flowchart of a downlink power control method applied to NB-IoT according to an embodiment of the present invention;
fig. 4 is a flowchart of a downlink power control method applied to NB-IoT according to an embodiment of the present invention;
fig. 5 is a flowchart of a downlink power control method applied to NB-IoT according to an embodiment of the present invention;
fig. 6 is a flowchart of a downlink power control method applied to NB-IoT according to a fourth embodiment of the present invention;
fig. 7 is a flowchart of a downlink power control method applied to NB-IoT according to an embodiment of the present invention;
fig. 8 is a flowchart of a sixth method for controlling downlink power applied to NB-IoT according to an embodiment of the present invention;
fig. 9 is a flowchart of a downlink power control method applied to NB-IoT according to an embodiment of the present invention;
fig. 10 is a flowchart eight of a downlink power control method applied to NB-IoT according to an embodiment of the present invention;
fig. 11 is a second schematic structural diagram of a first base station according to an embodiment of the present invention;
fig. 12 is a third schematic structural diagram of a first base station according to an embodiment of the present invention;
fig. 13 is a fourth schematic structural diagram of a first base station according to an embodiment of the present invention.
Detailed Description
The terms "first," "second," and "third," etc. in the description and in the claims of embodiments of the present invention are used for distinguishing between different objects and not for describing a particular order of the objects. For example, the first area, the second area, the third area, and so on are for distinguishing that the terminal is in different areas, not for describing a specific order of recording.
In the description of the embodiments of the present invention, the meaning of "a plurality" means two or more unless otherwise specified. For example, multiple processors refers to processors that include two or more physical cores.
Furthermore, the terms "comprising" and "having" and any variations thereof as mentioned in the description of the embodiments of the invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Some concepts involved in the NB-IoT downlink power control method and apparatus provided in the embodiments of the present invention are explained below.
NB-IoT: compared with GSM and LTE, the signal coverage gain is enhanced by 20dB through a narrow-band retransmission technology, the coverage area is enlarged by 100 times, the signal coverage gain can cover scenes such as basements, underground garages and underground pipelines, and the application requirements of users such as meter reading and pipeline detection are met.
Signal-to-noise ratio (SNR): is one of the parameters of the link state, which is a parameter describing the proportional relationship of the effective component to the noise component in the signal, expressed in dB. For example, the higher the snr value, the better the link state quality.
A first RSRP: and the reference signal received power of the terminal under the first base station.
And a second RSRP: and the reference signal received power of the terminal under the second base station.
The downlink power control method and device applied to the NB-IoT provided by the embodiment of the invention can be applied to the process that the base station controls the transmission power of the frequency band allocated to the NB-IoT. The downlink power control method and the device applied to the NB-IoT provided by the embodiment of the invention can reduce the interference of the adjacent cell to the terminal at the edge of the cell without shortening the coverage range of the NB-IoT, namely ensuring the normal transmission of data.
Please refer to fig. 1, which illustrates a system architecture diagram applied to a downlink power control method applied to NB-IoT according to an embodiment of the present invention. As shown in fig. 1, the system architecture may include a terminal 01, a first base station 02, and a second base station 03. The first base station 02 and the second base station 03 can perform information interaction through an X2 interface.
As shown in fig. 1, cell 1 is a coverage area of the first base station 02, cell 2 is a coverage area of the second base station 03, and area 3 is a 20dB coverage enhancement area of NB-IoT.
Illustratively, a terminal in embodiments of the present invention is a device that provides voice and/or data connectivity to a user, a handheld device having wired/wireless connectivity, or other processing device connected to a wireless modem. A terminal may communicate with one or more base stations. The terminal may be a mobile terminal, such as a mobile phone (or referred to as a "cellular" phone) and a computer having the mobile terminal, or a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, which exchanges languages and/or data with the RAN, for example, a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), and the like, which are not limited in this respect by the embodiment of the present invention.
Illustratively, the base station in the embodiment of the present invention is an apparatus deployed in a radio access network to provide a terminal with a wireless communication function. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, names of devices having a base station function may be different, for example, in an LTE system, The device is called an evolved NodeB (eNB or eNodeB), and in a 3rd Generation Telecommunication (3G) system, The device is called a base station (Node B), and so on. The name "base station" may change as communication technology evolves.
An embodiment of the present invention provides a base station, and fig. 2 shows a schematic structural diagram of a first base station provided in an embodiment of the present invention. As shown in fig. 2, the first base station 02 includes a processor 10, a memory 11, a communication interface 12, and a communication bus 13.
The following describes each component of the first base station in detail with reference to fig. 2:
the processor 10 is a control center of the first base station 02, and may be a single processor or a collective term for a plurality of processing elements. For example, processor 10 is a Central Processing Unit (CPU), or may be an Application Specific Integrated Circuit (ASIC), or may be one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs). The processor 10 connects various parts of the entire first base station 02 using various interfaces and lines. By executing or executing the software programs and/or modules stored in the memory 11 and calling up the data stored in the memory 11, various functions of the first base station 02 and processing data are performed, thereby performing overall monitoring of the first base station 02.
Optionally, in a specific implementation, the processor 10 may include one or more CPUs, such as CPU 0 and CPU 1 shown in fig. 2, as an embodiment.
Optionally, in a specific implementation, as an embodiment, the first base station 02 may include a plurality of processors, that is, the first base station 02 may include a multicore processor. Each of these processors may be a Single-core processor (Single-CPU) or a Multi-core processor (Multi-CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
The memory 11 may be used to store software programs and modules, and the processor 10 executes various functional applications and data processing of the first base station 02 by operating the software programs and modules stored in the memory 11. The memory 11 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the first base station 02, and the like. Further, the Memory 11 may be a Read-Only Memory (ROM) or other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices 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 Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage device, 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 this.
The communication interface 12 may be any device, such as a transceiver, for communicating with other devices or communication Networks, such as ethernet, RAN, Wireless Local Area Networks (WLAN), etc. The communication interface 12 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.
The communication bus 13 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus 13 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. 2, but it is not intended that there be only one bus or one type of bus.
It should be noted that the apparatus structure shown in fig. 2 does not constitute a limitation on the first base station 02, and may include more or less components than those shown in the drawings, or combine some components, or arrange different components, which is not limited in this embodiment of the present invention. Although not shown, the first base station 02 may further include a display, a battery, a camera, a bluetooth module, a Global Positioning System (GPS), and other modules, which are not described herein.
Based on each network function module in the system architecture shown in fig. 1 and each module or component of the first base station 02 shown in fig. 2, an embodiment of the present invention provides a downlink power control method applied to NB-IoT, which introduces details of a process of controlling, by the first base station, transmission power of a frequency band allocated to NB-IoT. Specifically, as shown in fig. 3, the downlink power control method applied to NB-IoT may include S301 to S303:
s301, the first base station receives control information sent by the terminal.
The control information includes signal parameters, the signal parameters include a first RSRP and an SINR, and the first RSRP and the SINR can be used to determine a region where the terminal is located.
Optionally, the signal parameter in the embodiment of the present invention may further include a data error rate.
S302, the first base station judges the area where the terminal is located according to the first RSRP and the SINR.
The first base station may determine the SINR and a preset snr decision threshold (i.e., Δ SINR), and determine the first RSRP and a preset reference signal received power decision threshold (i.e., Δ RSRP), so as to determine the area where the terminal is located.
Specifically, in the embodiment of the present invention, with reference to fig. 3, as shown in fig. 4, the foregoing S302 may be specifically implemented by S302a-S303 c:
s302a, if the SINR is greater than Δ SINR and the first RSRP is less than Δ RSRP, the first base station determines that the terminal is in the first area.
The Δ SINR is a signal-to-noise ratio decision threshold preset by the first base station, the Δ RSRP is a reference signal received power decision threshold preset by the first base station, and the first area is a deep coverage area in a cell covered by the first base station.
For example, the deep coverage area may be a basement, underground pipe, or the like.
S302b, if the SINR is less than Δ SINR and the first RSRP is less than Δ RSRP, the first base station determines that the terminal is in the second area.
The second area is a handover coverage area, the handover coverage area is an area covered by both the first base station and the second base station, and the second base station is an adjacent base station of the first base station.
For example, the second region may be region 3 in fig. 1.
S302c, if the SINR is greater than Δ SINR and the first RSRP is greater than Δ RSRP, the first base station determines that the terminal is in the third area.
And the third area is a normal area in a cell covered by the first base station. The normal area may be an area covered by the first base station that does not include basements, underground pipes, etc., and not covered by the second base station.
S303, the first base station determines the target transmitting power of the frequency band allocated to the NB-IoT according to the area where the terminal is located.
The areas where the terminals are located are different, and the target transmission power of the frequency band allocated to the NB-IoT by the first base station is different. The first base station may adjust the initial transmit power of the frequency band allocated to the NB-IoT according to the region in which the terminal is located.
The embodiment of the invention provides a downlink power control method applied to NB-IoT, wherein a first base station can judge the area where a terminal is located according to control information sent by the terminal, and determines target transmitting power of a frequency band allocated to the NB-IoT according to the area where the terminal is located. The target transmission power of the frequency band allocated to the NB-IoT by the first base station is different due to different areas where the terminals are located; when the first base station performs data interaction with terminals in different areas, different target transmitting powers are adopted, so that the coverage of NB-IoT can not be shortened, namely, normal transmission of data can be ensured; meanwhile, when the terminal is at the edge of the cell covered by the first base station, the interference of the adjacent cell to the terminal at the edge of the cell is reduced.
Specifically, in the first application scenario of the embodiment of the present invention, when the first base station determines that the terminal is in the first area, as shown in fig. 5 in combination with fig. 3, the above S303 may be specifically implemented by S303a1-S303d 1:
s303a1, the first base station increases the first initial transmission power to a first transmission power.
Wherein the first initial transmit power is an initial transmit power of a frequency band allocated to the NB-IoT by the first base station.
Illustratively, when the terminal is in the first area (i.e., deep coverage area), the first base station may increase the first initial transmission power in order to ensure that the coverage area of the first base station can cover the deep coverage area.
For example, the first initial transmit power of the first base station is P1, the first base station adjusts the amplitude value of the initial transmit power of the frequency band allocated to NB-IoT every time by e, and the first base station adjusts the first initial transmit power P1 to P1+ e after determining that the terminal is in the basement, that is, the first transmit power is P1+ e.
S303b1, the first base station receives the first data error rate reported by the terminal.
The first data error rate corresponds to the first transmission power. After the first base station increases the first initial transmission power to the first transmission power, the data error rate reported when the terminal interacts with the first base station changes, and the first base station judges whether to continuously adjust the first transmission power according to the data error rate reported by the terminal.
S303c1, the first base station determines whether the first data error rate is greater than or equal to a first threshold.
The first critical value is a data error rate decision threshold preset by the first base station. The first base station may determine whether to continue adjusting the first transmission power according to the first data error rate and the first threshold.
For example, after the first base station adjusts the first initial transmission power P1 to the first transmission power P1+ e, the first data error rate reported by the received terminal is x1, the first threshold value is y1, and the first base station determines the sizes of x1 and y 1.
S303d1, if the first data error rate is greater than or equal to the first threshold, the first base station determines the first transmit power as the target transmit power of the frequency band allocated to the NB-IoT.
Illustratively, when the first base station determines that x1 is greater than or equal to y1, the first base station determines the first transmit power P1+ e as the target transmit power of the band allocated to NB-IoT, i.e., the target transmit power of the band allocated to NB-IoT is P1+ e.
Further, in the embodiment of the present invention, when the first base station determines that the first data error rate is smaller than the first critical value, the first base station continues to increase the first transmission power until the received first data error rate reported by the terminal is greater than or equal to the first critical value, and determines the increased first transmission power as the target transmission power allocated to the NB-IoT frequency band.
For example, when the first base station determines that x1 is smaller than y1, the first base station adjusts the first transmission power P1+ e to P1+ e + e, and the first transmission power at this time is P1+ e + e, then the first base station receives a first data error rate reported by the terminal, and the first data error rate at this time is x2, the first base station determines the sizes of x2 and y1, and if x2 is greater than or equal to y1, the first base station determines the first transmission power P1+ e + e as the target transmission power allocated to the NB-IoT frequency band.
In the embodiment of the invention, when the terminal is in the first area (namely the deep coverage area), the target transmission power of the frequency band allocated to the NB-IoT determined by the first base station according to the area of the terminal takes the coverage range of the NB-IoT into consideration, so that the terminal can normally transmit data.
In a second application scenario of the embodiment of the present invention, when the first base station determines that the terminal is in the second area, with reference to fig. 3, as shown in fig. 6, the above S303 may be specifically implemented by S303a2-S303e 2:
s303a2, the first base station obtains a second RSRP of the second base station, and compares the first RSRP with the second RSRP.
After the first base station determines that the terminal is in the second area, the first base station may obtain, through the X2 interface, a second RSRP of the second base station, which is sent by the second base station.
And S303b2, when the first RSRP is larger than or equal to the second RSRP, the first base station increases the first initial transmission power to the second transmission power.
For example, when the first base station determines that the terminal is in the second region (i.e., the handover coverage) and determines that the first RSRP is greater than or equal to the second RSRP, the first base station may increase the first initial transmission power.
For example, the terminal is in the handover coverage (i.e., the area covered by both the first base station and the second base station), the first initial transmission power of the first base station is P1, the first base station presets an amplitude value for adjusting the initial transmission power of the frequency band allocated to NB-IoT each time to be e, the first RSRP is n, and the second RSRP is m. When n is larger than or equal to m, the first base station increases the first initial transmitting power P1 to P1+ e, namely, the second transmitting power is P1+ e.
Further, in the embodiment of the present invention, when the first base station increases the first initial transmission power to the second transmission power, the first base station may also send control information to the second base station, so as to reduce interference of the neighboring cell. Specifically, referring to fig. 6, as shown in fig. 7, it illustrates another downlink power control method applied to NB-IoT according to an embodiment of the present invention. The downlink power control method applied to NB-IoT shown in fig. 7 further performs S701 after S303b 2. S701 will now be described in detail:
s701, the first base station sends first indication information to the second base station.
The first indication information is used for indicating the second base station to turn down a second initial transmission power, wherein the second initial transmission power is the initial transmission power of the frequency band allocated to the NB-IoT by the second base station.
For example, when the first base station determines that the first RSRP is greater than or equal to the second RSRP, the first indication information may be sent to the second base station through an X2 interface, so that the second base station reduces the second initial transmission power.
For example, the second initial transmission power of the second base station is P2, the second base station adjusts the amplitude value of the initial transmission power of the frequency band allocated to NB-IoT every time, which is preset by the second base station, to e, and the second base station reduces the second initial transmission power P2 to P2-e after receiving the first indication information sent by the first base station.
It should be noted that, in the embodiment of the present invention, S303b2 may be executed first, and then S701 may be executed; or the step S701 may be executed first, and then the step S303b2 may be executed; s303b2 and S701 may also be performed simultaneously. The embodiment of the present invention does not limit the execution sequence of S303b2 and S701.
For example, in the embodiment of the present invention, when the first base station compares that the first RSRP is smaller than the second RSRP, the first base station may send indication information to the terminal, so that the second base station may adjust its own initial transmission power. Specifically, in conjunction with fig. 6, as shown in fig. 8, S303b2 in fig. 6 may be replaced with S303b 2':
s303b 2', when the first RSRP is smaller than the second RSRP, the first base station sends second indication information to the terminal.
The second indication information is used for indicating the terminal to send control information to the second base station, so that the second base station adjusts the second initial transmission power to the target transmission power of the frequency band allocated to the NB-IoT according to the control information.
Illustratively, after receiving the control information sent by the terminal, the second base station increases the second initial transmission power to a fourth transmission power, receives a fifth data error rate reported by the terminal, compares the fifth data error rate with a second critical value, and determines the fourth transmission power as the target transmission power allocated to the NB-IoT frequency band if the fifth data error rate is greater than or equal to the second critical value.
For example, the second initial transmission power of the second base station is P2, the second base station preset amplitude value for adjusting the initial transmission power of the frequency band allocated to NB-IoT each time is e, and the second threshold value is y 2. After receiving the control information sent by the terminal, the second base station increases the second initial transmission power P2 to a fourth transmission power P2+ e; the second base station receives a fifth data error rate x3 reported by the terminal, and judges the sizes of x3 and y 2; if x3 is greater than or equal to y2, the second base station determines the fourth transmit power P1+ e as the target transmit power for the band allocated to the NB-IoT.
Further, in the embodiment of the present invention, when the first base station sends the second indication information to the terminal, the first base station may also adjust its own initial transmission power, so as to reduce the interference of the local cell. Specifically, referring to fig. 8, as shown in fig. 9, another downlink power control method applied to NB-IoT according to an embodiment of the present invention is shown. The downlink power control method applied to NB-IoT shown in fig. 9 further performs S901 after S303b 2'. S901 will now be explained in detail:
s901, the first base station reduces the first initial transmitting power.
When the terminal is in the second area and the first RSRP is smaller than the second RSRP, the first base station may further reduce the first initial transmission power after sending the second indication information to the terminal.
For example, when the terminal is in the second area, the first initial transmission power is P1, the first base station adjusts the amplitude value of the initial transmission power of the frequency band allocated to the NB-IoT each time to be e, and when the first base station determines that the first RSRP is smaller than the second RSRP, the first initial transmission power P1 is reduced to P1-e.
It should be noted that, in the embodiment of the present invention, S303b 2' may be executed first, and then S901 is executed; or the step S901 may be executed first, and then the step S303b 2' may be executed; s303b 2' and S901 may also be performed simultaneously. The embodiment of the present invention does not limit the execution sequence of S303b 2' and S901.
S303c2, the first base station receives the second data error rate reported by the terminal.
Wherein the second data error rate corresponds to the second transmit power. After the first base station increases the first initial transmitting power to the second transmitting power, the data error rate reported when the terminal interacts with the first base station changes, and the first base station judges whether to continuously adjust the second transmitting power according to the data error rate reported by the terminal.
S303d2, the first base station determines whether the second data error rate is greater than or equal to the first threshold.
The first base station may determine whether to continue adjusting the second transmission power according to the second data error rate and the first critical value.
For example, after the first base station adjusts the first initial transmission power P1 to the second transmission power P1+ e, the second data error rate reported by the received terminal is x4, the first threshold value is y1, and the first base station determines the sizes of x4 and y 1.
S303e2, if the second data error rate is greater than or equal to the first threshold, the first base station determines the second transmission power as the target transmission power of the frequency band allocated to the NB-IoT.
For example, when the first base station determines that x4 is greater than or equal to y1, the first base station determines the first transmit power P1+ e as the target transmit power of the band allocated to NB-IoT, i.e., the target transmit power of the band allocated to NB-IoT is P1+ e.
Further, in the embodiment of the present invention, when the first base station determines that the second data error rate is smaller than the first critical value, the first base station continues to increase the second transmission power until the received second data error rate reported by the terminal is greater than or equal to the first critical value, and determines the increased second transmission power as the target transmission power allocated to the NB-IoT frequency band.
For example, when the first base station determines that x4 is smaller than y1, the first base station increases the second transmission power P1+ e to P1+ e + e, where the second transmission power is P1+ e + e; then the first base station receives a second data error rate reported by the terminal, the second data error rate is x5, and the first base station judges the sizes of x5 and y 1; if x5 is smaller than y1, the first base station increases the second transmission power P1+ e + e to P1+ e + e + e, and the second transmission power is P1+ e + e + e; then the first base station receives a second data error rate reported by the terminal, the second data error rate is x6, and the first base station judges the sizes of x6 and y 1; if x6 is greater than or equal to y1, the first base station determines the second transmit power P1+ e + e + e as the target transmit power for the band allocated to NB-IoT.
In the embodiment of the present invention, when the terminal is located in the second area (i.e. the edge position of the cell covered by the first base station), the second base station may cause interference to the terminal; the first base station determines the target transmission power of the frequency band allocated to the NB-IoT according to the area of the terminal and the sizes of the first RSRP and the second RSRP, and not only considers the coverage range of the NB-IoT, but also considers the interference of the adjacent cell to the terminal at the edge of the cell.
In a third application scenario of the embodiment of the present invention, when the first base station determines that the terminal is located in the third area, with reference to fig. 3, as shown in fig. 10, the above S303 may be specifically implemented by S303a3-S303f 3:
s303a3, where the first base station receives the third data error rate reported by the terminal.
And the third data error rate is the initial data error rate sent by the terminal.
Of course, in the embodiment of the present invention, the first base station may also obtain the third data error rate by receiving the control information sent by the terminal, that is, the control information includes a signal parameter, and the signal parameter further includes the third data error rate.
S303b3, the first base station determines whether the third data error rate is smaller than the first threshold.
When the first base station determines that the terminal is in the third area, that is, the area covered by the first base station does not include the basement, the underground pipeline and the like, and the area not covered by the second base station, the first base station may determine whether to increase the first initial transmission power according to a third data error rate reported by the terminal.
For example, the third data error rate reported by the terminal received by the first base station is x7, the first threshold value is y1, and the first base station determines the sizes of x7 and y 1.
S303c3, if the third data error rate is smaller than the first threshold, the first base station increases the first initial transmission power to the third transmission power.
Wherein the first initial transmit power is an initial transmit power of a frequency band allocated to the NB-IoT by the first base station.
For example, when the first base station determines that x7< y1, the first base station increases the first initial transmit power P1 to the third transmit power P1+ e.
Optionally, in this embodiment of the present invention, if the third data error rate received by the first base station is greater than or equal to the first critical value, the first base station may not adjust the first initial transmission power.
S303d3, where the first base station receives the fourth data error rate reported by the terminal.
And the fourth data error rate corresponds to the third transmitting power. And after the first base station increases the first initial transmitting power to the third transmitting power, the first base station receives a fourth data error rate reported by the terminal, and determines whether to continuously increase the third initial transmitting power according to the fourth data error rate.
S303e3, the first base station determines whether the fourth data error rate is greater than or equal to the first threshold.
For example, the fourth data error rate reported by the terminal received by the first base station is x8, the first threshold value is y1, and the first base station determines the sizes of x8 and y 1.
S303f3, if the fourth data error rate is greater than or equal to the first threshold, the first base station determines the third transmission power as the target transmission power of the frequency band allocated to the NB-IoT.
For example, when the first base station determines that x8 is greater than or equal to y1, the first base station determines the third transmit power P1+ e as the target transmit power of the band allocated to NB-IoT, i.e., the target transmit power of the band allocated to NB-IoT is P1+ e.
Further, in the embodiment of the present invention, when the first base station determines that the fourth data error rate is smaller than the first critical value, the first base station continues to increase the third transmission power until the received fourth data error rate reported by the terminal is greater than or equal to the first critical value, the first base station stops increasing the third transmission power, and determines the increased third transmission power as the target transmission power allocated to the NB-IoT frequency band.
For example, when the first base station determines that x8 is smaller than y1, the first base station increases the third transmission power P1+ e to P1+ e + e, where the third transmission power is P1+ e + e; then the first base station receives a fourth data error rate reported by the terminal, the fourth data error rate is x9, and the first base station judges the sizes of x9 and y 1; if x9 is greater than or equal to y1, the first base station determines the third transmit power P1+ e + e as the target transmit power for the band allocated to NB-IoT.
In the embodiment of the invention, when the terminal is in the third area (namely the normal area of the cell covered by the first base station), the second base station does not cause interference to the terminal; the first base station determines the target transmitting power of the frequency band allocated to the NB-IoT according to the area of the terminal, and considers the coverage range of the NB-IoT, so that the terminal can normally transmit data.
The above description mainly introduces the solution provided by the embodiment of the present invention from the perspective of the first base station. It is understood that the first base station comprises corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-mentioned functions. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware, or a combination of hardware and computer software, for example, for the first base station and the algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiment of the present invention, the first base station may be divided into the functional modules or the functional units according to the above method examples, 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 embodiments of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
Fig. 11 shows a schematic diagram of a possible structure of the first base station involved in the above embodiment. The first base station 1100 may include: a receiving unit 1101, a judging unit 1102, and a determining unit 1103.
The function of the receiving unit 1101 may be implemented by the communication interface 12 shown in fig. 2. The receiving unit 1101 is used to support S301 in the above-described embodiments, and/or other processes for the techniques described herein.
The function of the determination unit 1102 may be implemented by the processor 10 shown in fig. 2. The determination unit 1102 is used to support S302 and S302a-S303c in the above-described embodiments, and/or other processes for the techniques described herein.
The function of the determining unit 1103 may be implemented by the processor 10 shown in fig. 2. The determination unit 1103 is used to support S303, S303a1-S303d1, S303a2-S303e2, S303b 2', and S303a3-S303f3 in the above-described embodiments, and/or other processes for the techniques described herein.
Further, when the determining unit 1103 compares that the first RSRP is greater than or equal to the second RSRP, as shown in fig. 12 in conjunction with fig. 11, the first base station 1100 may further include: a transmission unit 1104.
The function of the transmitting unit 1104 can be implemented by the communication interface 12 shown in fig. 2. The sending unit 1104 is used to support S701 in the above embodiments, and/or other processes for the techniques described herein.
Further, when the determining unit 1103 compares that the first RSRP is smaller than the second RSRP, as shown in fig. 13 in conjunction with fig. 11, the first base station 1100 may further include: an adjustment unit 1105.
The function of the adjusting unit 1105 may be implemented by the processor 10 shown in fig. 2. The adjustment unit 1105 is used to support S901 in the above embodiments, and/or other processes for the techniques described herein.
Of course, the first base station 1100 provided in the embodiment of the present invention includes, but is not limited to, the above-described modules, and for example, the first base station 1100 may further include a storage unit. The function of the memory unit may be implemented by the memory 11 shown in fig. 2.
In the case of using an integrated unit, the above-mentioned determination unit 1102, determination unit 1103, adjustment unit 1105, and the like may be implemented by being integrated in one processing module, which may be the processor 10. The receiving unit 1101 and the transmitting unit 1104 may be implemented integrally in one communication module, which may be the communication interface 12.
Embodiments of the present invention also provide a computer-readable storage medium including computer instructions which, when executed on a computer, cause the computer to perform the associated method steps as in any of fig. 3-10.
The detailed description of each module in the first base station 1100 and the technical effects brought by each module or unit after performing the related method steps in any one of fig. 3 to fig. 10 provided in the embodiment of the present invention may refer to the related description in the embodiment of the method of the present invention, and are not repeated herein.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be essentially or partially contributed to by the prior art, or all or part of the technical solution may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions within the technical scope of the present invention are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (18)
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| CN113473586A (en) * | 2020-03-30 | 2021-10-01 | 福州市博讯网络科技有限公司 | Wireless video transmission system power control method for high-definition video transmission |
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