CN106793047B - Uplink power control method and base station - Google Patents
Uplink power control method and base station Download PDFInfo
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- CN106793047B CN106793047B CN201710096611.4A CN201710096611A CN106793047B CN 106793047 B CN106793047 B CN 106793047B CN 201710096611 A CN201710096611 A CN 201710096611A CN 106793047 B CN106793047 B CN 106793047B
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- 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
- H04W52/12—Outer and inner loops
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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
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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
- H04W52/18—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
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Abstract
The invention relates to the technical field of communication, in particular to an uplink power control method and a base station, which are used for effectively controlling the interference phenomenon of adjacent cells and comprise the following steps: a base station determines an interference neighbor set of a terminal under the base station, wherein the interference neighbor set is used for representing a neighbor interfered by the terminal; the base station determines a power control indication type of the terminal according to the interfered type of each adjacent cell in the interfered adjacent cell set, wherein the interfered type of each adjacent cell is used for indicating the interfered degree of each adjacent cell; and the base station controls the uplink power of the terminal according to the determined power control indication type. Because the interference adjacent cell of the terminal is determined, and the power control is carried out on the terminal according to the interference type of the adjacent cell, the uplink power of the terminal in the interference source can be accurately reduced to realize the reduction of the interference among the cells, and the uplink power of the non-interference source terminal is accurately improved to increase the utilization of system resources, so that the performance of the terminal is improved, and the overall throughput of the system is also improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an uplink power control method and a base station.
Background
Power control in an LTE (Long Term Evolution) system is divided into downlink power control And uplink power control according to a link direction, where the downlink power control is a power allocation strategy that uses a constant transmission power in frequency And time, that is, the downlink power control is a Resource Element (RE) unit, And the uplink power control is such that for the same Modulation And Coding Scheme (MCS), PSD (power spectral Density) of different users arriving at a base station, that is, power over a unit bandwidth, is approximately equal.
For the LTE system, the downlink employs an OFDMA (Orthogonal Frequency Division Multiple Access) technique, so downlink signals between different users are Orthogonal to each other, the near-far effect of the CDMA (code Division Multiple Access) system does not exist, and uplink data between different users in the same downlink cell are designed to be Orthogonal to each other in order not to affect the accuracy of downlink CQI (Channel Quality Indicator) measurement and downlink scheduling. The base station allocates different sending bandwidths and modulation coding schemes MCS to different users, so that the users under different conditions obtain corresponding different uplink sending rates. Therefore, the management of uplink interference in a cell is relatively much easier for an LTE system than for a CDMA system.
In a cellular mobile communication system constructed by taking OFDM as a multiple access method adopted by an LTE system, a frequency reuse factor of 1 can be achieved, that is, all cells within the coverage area of the entire system use the same frequency band to provide services for users of the cell, so that SINR (Signal to Interference plus noise ratio) of users at the center of the cell can be greatly improved, and thus higher data rate and better service quality can be provided. For the users at the cell edge, because the interference to the users occupying the same carrier resources by the adjacent cells is large, and the distance from the adjacent cells to the base station is long, the SINR of the users is relatively small, which results in the situation that although the throughput of the whole cell is high, the service quality of the users at the cell edge is poor, and the throughput is low.
In order to solve the problem of serious interference at the cell edge of the LTE system, 3GPP proposes various solutions, including interference randomization, interference cancellation, and interference coordination techniques. Interference randomization utilizes the statistical characteristic of the interference to suppress the interference, and the error is large; the interference cancellation technology can significantly improve the system performance at the cell edge and obtain higher spectral efficiency, but is not suitable for services with smaller bandwidth (such as VoIP (Voice over Internet Protocol)), and is also relatively complex to implement in the OFDMA system, and the subsequent research on the system is not much; interference coordination/avoidance is a popular technology currently studied, is simple to implement, can be applied to services with various bandwidths, and has a good effect on interference suppression.
The core idea of the interference coordination technology of the LTE system is to adopt a frequency reuse technology to make the distance between the interference signal sources in the adjacent cells as far as possible, thereby suppressing the interference of the adjacent cells, and achieving the effects of improving the transmission quality and increasing the throughput. In addition, in order to enable better interconnection and interworking between cells, 3GPP protocols stipulate that the cell information interaction between base stations can be realized through the establishment of an X2 interface, wherein a load indication function of an X2 interface enables OI (overload indicator) and HII (high interference indicator) of a transmission system between base stations, thereby realizing interference coordination between cells.
At present, a common method for performing interference coordination based on an OI indication is that after receiving an interference indication of an adjacent cell, a base station only implements a power control strategy for users using an interfered resource block subset, so that misadjustment is easily generated because the resource position scheduled by the users in real time is dynamically changed; or only carrying out a power control strategy on the edge users; or when the base station receives the interference overload indication, the Po _ UE _ pusch (j) (semi-static reference point, i.e. uplink expected received power) of the cell center and/or the cell edge user is adjusted according to the interference overload indication, and the like, which methods do not determine which users really cause interference, so that power reduction operation is easily performed because the users schedule the uncertainty of the resource block or the edge users which do not really cause interference are misjudged as interference source users; this results in reduced performance for non-interfering users, but no improvement in reducing inter-cell interference.
In summary, the uplink power control method for the terminal in the prior art has the problems of inaccurate power control and incapability of effectively controlling the interference phenomenon of the neighboring cell.
Disclosure of Invention
The invention provides an uplink power control method and a base station, which are used for effectively controlling the interference phenomenon of adjacent regions.
In a first aspect, an embodiment of the present invention provides an uplink power control method, including:
a base station determines an interference neighbor set of a terminal under the base station, wherein the interference neighbor set is used for representing a neighbor interfered by the terminal;
the base station determines a power control indication type of the terminal according to the interfered type of each adjacent cell in the interfered adjacent cell set, wherein the interfered type of each adjacent cell is used for indicating the interfered degree of each adjacent cell;
and the base station controls the uplink power of the terminal according to the determined power control indication type.
Optionally, the determining, by the base station, the interfering neighbor set of the terminal under the base station includes:
the base station determines the adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal;
the base station determines the position state of the terminal, wherein the position state is used for indicating the relative position of the terminal under the base station;
if the position state is a cell center, the base station takes a set formed by all adjacent cells except a target adjacent cell in the adjacent cells of the terminal as an interference adjacent cell set of the terminal, and the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cell of the terminal is smaller than a preset interference threshold;
and if the position state is the cell edge, the base station takes a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
Optionally, the determining, by the base station, the interfering neighbor set of the terminal under the base station includes:
the base station determines the adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal;
the base station determines the quality state of the terminal, wherein the quality state is used for indicating the interference condition of the terminal under the base station;
if the quality state is not interfered, the base station takes a set formed by all adjacent cells except a target adjacent cell in the adjacent cells of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cell of the terminal is smaller than a preset interference threshold;
and if the quality state is interfered, the base station takes a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
Optionally, the determining, by the base station, a power control indication type of the terminal according to the interfered type of each neighboring cell in the interfering neighboring cell set includes:
if the interfered type of at least one adjacent cell in the interference adjacent cell set is strong interference, the base station determines that the power control indication type of the terminal is power control limitation;
if the interfered types of all the adjacent cells in the interfered adjacent cell set are not strong interference and the interfered type of at least one adjacent cell is medium interference, the base station determines the power control indication type of the terminal as power control retention;
and if the interfered types of all the adjacent cells in the interfered adjacent cell set are low interference, the base station determines the power control indication type of the terminal as power control promotion.
Optionally, the controlling, by the base station, the uplink power of the terminal according to the determined power control indication type includes:
if the power control indication type of the terminal is power control limitation, the base station reduces the increase step length in the uplink inner loop power control of the terminal and reduces the target signal-to-interference ratio in the uplink outer loop power control of the terminal;
if the power control indication type of the terminal is power control maintenance, the base station maintains an original power control strategy for the terminal;
and if the power control indication type of the terminal is power control improvement, the base station increases the increase step length in the uplink inner loop power control of the terminal and increases the target signal-to-interference ratio in the uplink outer loop power control of the terminal.
In a second aspect, an embodiment of the present invention provides a base station, including:
an interference neighbor cell determining unit, configured to determine an interference neighbor cell set of a terminal in a base station, where the interference neighbor cell set is used to represent a neighbor cell interfered by the terminal;
a power control indication type determining unit, configured to determine a power control indication type of the terminal according to an interfered type of each neighboring cell in the interfering neighboring cell set, where the interfered type of each neighboring cell is used to indicate an interfered degree of each neighboring cell;
and the control unit is used for controlling the uplink power of the terminal according to the determined power control indication type.
Optionally, the interfering neighboring cell determining unit is specifically configured to:
determining adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal;
determining a position state of the terminal, wherein the position state is used for indicating the relative position of the terminal under the base station;
if the position state is a cell center, using a set formed by all adjacent cells except a target adjacent cell in the adjacent cells of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cells of the terminal is smaller than a preset interference threshold;
and if the position state is the cell edge, taking a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
Optionally, the interfering neighboring cell determining unit is specifically configured to:
determining adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal;
determining a quality state of the terminal, wherein the quality state is used for indicating that the terminal is interfered under the base station;
if the quality state is not interfered, taking a set formed by all adjacent cells except a target adjacent cell in the adjacent cell of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cell of the terminal is smaller than a preset interference threshold;
and if the quality state is interfered, taking a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
Optionally, the power control indication type determining unit is specifically configured to:
if the interfered type of at least one adjacent cell in the interference adjacent cell set is strong interference, determining that the power control indication type of the terminal is power control limitation;
if the interfered types of all the adjacent cells in the interfered adjacent cell set are not strong interference and the interfered type of at least one adjacent cell is medium interference, determining the power control indication type of the terminal as power control retention;
and if the interfered types of all the adjacent cells in the interfered adjacent cell set are low interference, determining the power control indication type of the terminal as power control promotion.
Optionally, the control unit is specifically configured to:
if the power control indication type of the terminal is power control limitation, reducing the increasing step length in uplink inner loop power control of the terminal and reducing the target signal-to-interference ratio in uplink outer loop power control of the terminal;
if the power control indication type of the terminal is power control maintenance, maintaining an original power control strategy for the terminal;
and if the power control indication type of the terminal is power control promotion, increasing the increasing step length in the uplink inner loop power control of the terminal and increasing the target signal-to-interference ratio in the uplink outer loop power control of the terminal.
In the embodiment of the invention, a base station determines an interference neighbor set of a terminal under the base station, wherein the interference neighbor set is used for representing a neighbor interfered by the terminal; the base station determines a power control indication type of the terminal according to the interfered type of each adjacent cell in the interfered adjacent cell set, wherein the interfered type of each adjacent cell is used for indicating the interfered degree of each adjacent cell; and the base station controls the uplink power of the terminal according to the determined power control indication type. Because the interference adjacent cell of the terminal is determined, and the power of the terminal is controlled according to the interference type of the adjacent cell, the uplink power of the terminal in the interference source of the adjacent cell can be accurately reduced to realize the reduction of the interference between the cells, and the uplink power of the non-interference source terminal is accurately improved to increase the utilization of system resources, so that the performance of the terminal is improved, and the overall throughput of the system is also improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of an uplink power control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a cell structure provided in an embodiment of the present invention;
fig. 3 is a detailed flowchart of an uplink power control method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a base station according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the 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 embodiments of the present application may be applicable to a 4G (fourth generation mobile communication system) evolution system, such as an LTE (Long term evolution) system, or may also be applicable to a 5G (fifth generation mobile communication system) system, such as an access network using a New radio access technology (New RAT); communication systems such as CRAN (Cloud Radio access network ). Hereinafter, some terms in the present application are explained to facilitate understanding by those skilled in the art.
1) A terminal, also called a User Equipment (UE), is a device providing voice and/or data connectivity to a User, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and so on. Common terminals include, for example: the mobile phone includes a mobile phone, a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), and a wearable device such as a smart watch, a smart bracelet, a pedometer, and the like.
2) A base station, also called a Radio Access Network (RAN) device, is a device for accessing a terminal to a wireless Network, and includes but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), Home Base Station (e.g., Homeevolved Node B, or Home Node B, HNB), BaseBand Unit (BBU). In addition, a Wifi Access Point (AP) or the like may also be included.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
As shown in fig. 1, an execution subject of the uplink power control method provided in the embodiment of the present invention is a base station, and the method includes:
And step 102, the base station determines a power control indication type of the terminal according to the interfered type of each neighboring cell in the interfering neighboring cell set, wherein the interfered type of each neighboring cell is used for indicating the interfered degree of each neighboring cell.
And 103, the base station controls the uplink power of the terminal according to the determined power control indication type.
In step 101, the base station determines an interference neighboring cell set of each terminal under the base station, that is, each terminal under the base station corresponds to one interference neighboring cell set, and the interference neighboring cell set is used to indicate a neighboring cell interfered by each terminal.
For example, referring to fig. 2, a schematic diagram of a Cell structure provided in the embodiment of the present invention is illustrated, in which a base station Cell0 (also referred to as a Cell0) is taken as an example, as shown in fig. 2, assuming that there are terminals UE1, UE2, UE3, and UE4 under the base station Cell0, the base station Cell0 may collect measurement information of terminals UE1 to UE4 in a base station as follows:
UE1：(Cell5，-105dBm)、(Cell6，-98dBm)；
UE2：(Cell2，-95dBm)；
UE3：(Cell4，-90dBm)；
UE4：(Cell1，-98dBm)、(Cell6，-99dBm)。
thus, the base station Cell0 may obtain the interference neighbor set of each terminal respectively:
interfering neighbor set of UE 1: { Cell5, Cell6 };
interfering neighbor set of UE 2: { Cell2 };
interfering neighbor set of UE 3: { Cell4 };
interfering neighbor set of UE 4: { Cell1, Cell6 }.
Of course, in order to accurately determine the interfering user, the embodiment of the present invention may use any one of the following two methods to determine the interfering neighbor set of each terminal in the base station.
Method one, position state of terminal and measurement information reported by terminal
Aiming at any terminal under a base station, the method is realized by the following steps:
step A1, the base station determines the adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal.
Taking the above example as an example, it may be determined that the neighboring cells of each terminal and the reference signal received power of each neighboring cell are:
UE1：(Cell5，-105dBm)、(Cell6，-98dBm)；
UE2：(Cell2，-95dBm)；
UE3：(Cell4，-90dBm)；
UE4：(Cell1，-98dBm)、(Cell6，-99dBm)。
step B1, the base station determines the position state of the terminal, and the position state is used for indicating the relative position of the terminal under the base station; if the location status is the cell center, go to step C1, and if the location status is the cell edge, go to step D1.
The position state of the terminal can be obtained by performing decision through various methods, which are known technologies, and a common method is to decide through the spatial distance between the terminal and the base station, set a received Power threshold RSRPth of a Reference Signal, for example, set to-95 dBm, and when the Reference Signal Receiving Power (RSRP) of the terminal is greater than the threshold, consider the position state of the terminal as the cell edge, otherwise, as the cell center; or, it can also determine whether the user is at the cell edge by the quality difference between the serving base station and the neighboring base station, and when the neighboring quality is greater than the serving cell quality by a certain threshold, the location state of the terminal is considered as the cell edge, otherwise, as the cell center.
And step C1, the base station uses a set formed by all the adjacent cells except the target adjacent cell in the adjacent cell of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power is smaller than a preset interference threshold in the adjacent cell of the terminal.
In this step, the position state of the terminal is the cell center, that is, the terminal is located at or near the center position of the base station, and the set formed by all the neighboring cells except the target neighboring cell in the neighboring cells of the terminal is used as the interfering neighboring cell set of the terminal, so the target neighboring cell is not considered, because the reference signal receiving power of the target neighboring cell is less than the preset interference threshold, the possibility that the terminal causes interference to the target neighboring cell can be considered to be low, and the base station overhead is reduced, so such neighboring cells are not considered.
And D1, the base station takes the set formed by the adjacent cells of the terminal as the interference adjacent cell set of the terminal.
For a terminal whose location state is at the edge of a cell, a set formed by neighboring cells of the terminal is directly used as an interfering neighboring cell set of the terminal, and this is so set because the terminal located at the edge of the cell is likely to cause interference to the neighboring cells, and therefore all needs to be considered.
For example, assuming the location state of the UE1 is cell center and the location states of the UE2, UE3, and UE4 are cell edge, then:
for UE 1: deleting the neighbor Cell5 with the reference signal received power of the pre-neighbor Cell being less than the preset interference threshold (assuming Ith is-99 dBm), and obtaining an interference neighbor set.
For UE2, UE3, and UE4, the set of neighboring cells is directly used as the interfering neighbor set.
The interference neighbor cell set of each UE obtained finally is:
UE1 interferes with the neighbor set: { Cell6 };
UE2 interferes with the neighbor set: { Cell2 };
UE3 interferes with the neighbor set: { Cell4 };
UE4 interferes with the neighbor set: { Cell1, Cell6 }.
Method two, quality state of terminal + measurement information reported by terminal
Aiming at any terminal under a base station, the method is realized by the following steps:
step A2, the base station determines the adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal.
The steps are the same as those of the step A1, and are not described in detail herein.
And step B2, the base station determines the quality state of the terminal, the quality state is used for indicating the interference condition of the terminal under the base station, if the quality state is not interfered, the step C2 is carried out, and if the quality state is interfered, the step D2 is carried out.
In this step, a quality status of the terminal is determined, where the quality status is used to indicate that the terminal is interfered with by the base station. The quality state of the user is divided into interfered state and non-interfered state, and the signal to interference plus noise ratio of the terminal can be compared with a preset signal to interference plus noise ratio threshold, for example, the threshold is set to be 6dB, when the signal to interference plus noise ratio of the terminal is greater than the preset signal to interference plus noise ratio threshold, the quality state of the terminal is the non-interfered state, otherwise, the quality state is the interfered state.
Step C2, the base station uses a set formed by all neighboring cells except the target neighboring cell in the neighboring cell of the terminal as an interfering neighboring cell set of the terminal, where the target neighboring cell is a neighboring cell in which the reference signal receiving power in the neighboring cell of the terminal is smaller than a preset interference threshold.
The steps are the same as those of step C1, and are not described in detail here.
And D2, the base station takes the set formed by the adjacent cells of the terminal as the interference adjacent cell set of the terminal.
This step is the same as step D1 described above and will not be described here.
In step 102, the base station determines a power control indication type of the terminal according to an interfered type of each neighboring cell in the interfering neighboring cell set, where the interfered type of each neighboring cell is used to indicate an interfered degree of each neighboring cell. Moreover, the interference condition of the neighboring cell may be represented by an overload indication transferred by the X2 interface, or may be represented by a neighboring cell interference indication sent by the local centralized control unit.
One optional implementation is: the method comprises the steps of dividing interference types of a neighboring cell into strong interference, medium interference and low interference, wherein the strong interference refers to interference with interference strength larger than a first interference threshold, the medium interference refers to interference with interference strength smaller than or equal to the first interference threshold and larger than or equal to a second interference threshold, and the low interference refers to interference with interference strength smaller than the second interference threshold, wherein the first interference threshold is larger than the second interference threshold.
In this division mode, then:
if the interfered type of at least one adjacent cell in the interfered adjacent cell set of one terminal is strong interference, the base station determines that the power control indication type of the terminal is power control limitation;
if the interfered types of all the adjacent cells in the interfered adjacent cell set of a terminal are not strong interference and the interfered type of at least one adjacent cell is medium interference, the base station determines the power control indication type of the terminal as power control maintenance;
and if the interfered types of all the adjacent cells in the interfered adjacent cell set of one terminal are low interference, the base station determines the power control indication type of the terminal as power control promotion.
When the power control indication type of the terminal is power control limitation, the base station reduces the increase step length in the uplink inner loop power control of the terminal and reduces the target signal-to-interference ratio in the uplink outer loop power control of the terminal;
for example, the increase step generally includes-3, 1, 2, and 3, and assuming that the current increase step is 3, if it is determined that the power control indication type of the terminal is the power control limit, the current increase step may be reduced from 3 to 2, or reduced to 1, or reduced to-3 (i.e., the uplink inner loop power is reduced).
And, the target signal-to-interference ratio in the uplink outer loop power control of the terminal refers to the maximum value of the signal-to-interference ratio of the uplink outer loop power of the terminal, and when the value is reduced, it means that the maximum transmission power of the terminal is reduced, so that the purpose of controlling the uplink transmission power of the terminal can be achieved.
When the power control indication type of the terminal is power control maintenance, the base station maintains the original power control strategy for the terminal;
and when the power control indication type of the terminal is power control promotion, the base station increases the increasing step length in the uplink inner loop power control of the terminal and increases the target signal-to-interference ratio in the uplink outer loop power control of the terminal.
Assuming that the current increasing step is 1, if it is determined that the power control indication type of the terminal is power control boosting, the current increasing step may be increased from 1 to 2, or increased to 3.
In step 103, the base station controls the uplink power of the terminal according to the determined power control indication type.
Specifically, the following are: power control limiting, power control maintaining and power control improving.
In connection with the above example, assume: knowing that the interfered type of the neighboring Cell1 is low interference, the interfered type of the neighboring Cell2 is low interference, the interfered type of the neighboring Cell4 is medium interference, the interfered type of the neighboring Cell5 is low interference, the interfered condition of the neighboring Cell6 is strong interference, and the base station Cell0 determines the power control indication type of each terminal according to the interfered neighboring Cell set of the terminal and the interfered type of the neighboring Cell and controls the uplink power of the terminal according to the power control indication type.
Specifically, since there is one neighboring Cell, that is, the interfered type of the neighboring Cell6, in the interfering neighboring Cell set of the UE1 is strong interference, the power control instruction of the user is power control restriction;
if the interfered types of all the adjacent cells in the interfering adjacent cell set of the UE2 are low interference, the power control instruction of the user is power control boost;
if the interfered type of no adjacent Cell in the interfering adjacent Cell set of the UE3 is strong interference, but the interfered condition of one adjacent Cell (adjacent Cell4) is medium interference, the power control indication of the terminal is power control maintenance;
if the interfered type of a neighboring Cell, namely a neighboring Cell6, in the interfering neighboring Cell set of the UE4 is strong interference, the power control indication of the terminal is power control limitation;
and finally, respectively obtaining power control instructions of the UE 1-UE 4 as follows:
power control indication of UE 1: { Cell6 (strong interference) } -power control restriction;
power control indication of UE 2: { Cell2 (low interference) } -power control boost;
power control indication of UE 3: { Cell4 (medium interference) } -power control hold;
power control indication of UE 4: { Cell1 (low interference), Cell6 (strong interference) } -power control limit.
As can be seen from the above, the power control restriction operation is performed for both UE1 and UE 4: for the terminal of the type, reducing the increasing step length in the uplink inner loop power control of the terminal and reducing the target signal-to-interference ratio in the uplink outer loop power control of the terminal;
power control hold operation is performed for the UE 3: maintaining an original power control strategy for the terminal, wherein the power control strategy can be a known uplink inner ring and uplink outer ring power control strategy;
performing a power control boost operation for the UE 2: and for the terminal, increasing the increasing step length in the uplink inner loop power control of the terminal and increasing the target signal-to-interference ratio in the uplink outer loop power control of the terminal.
In the embodiment of the invention, a base station determines an interference neighbor set of a terminal under the base station, wherein the interference neighbor set is used for representing a neighbor interfered by the terminal; the base station determines a power control indication type of the terminal according to the interfered type of each adjacent cell in the interfered adjacent cell set, wherein the interfered type of each adjacent cell is used for indicating the interfered degree of each adjacent cell; and the base station controls the uplink power of the terminal according to the determined power control indication type. Because the interference adjacent cell of the terminal is determined, and the power of the terminal is controlled according to the interference type of the adjacent cell, the uplink power of the terminal in the interference source of the adjacent cell can be accurately reduced to realize the reduction of the interference between the cells, and the uplink power of the non-interference source terminal is accurately improved to increase the utilization of system resources, so that the performance of the terminal is improved, and the overall throughput of the system is also improved.
Compared with the prior art, the embodiment of the invention has the following advantages:
1. a base station obtains an interference neighbor set of a terminal, accurately divides potential interference neighbors of the terminal, respectively controls power by taking the terminal as a unit, does not synthesize interference conditions of all neighbors to control power of a certain class or a certain part of terminals, reduces the probability of misadjustment of the power of the terminal, and enables system resources to be utilized to the maximum;
2. the base station determines a power control instruction of each terminal according to the interference neighbor set of the terminal and the interference condition of the neighbor, executes corresponding power control operation, mainly represents interference instructions of interference neighbors corresponding to the integrated terminal, and reduces the power of an interference source terminal when the neighbor is interfered; when the adjacent cell is not interfered, the power of the non-interference source terminal is improved, corresponding power control operation is executed according to the interference condition, the resource utilization rate of the system is improved, and the purposes of reducing the inter-cell interference and improving the performance of the system are achieved.
By using the method of the embodiment of the invention, the interference source terminal can be quickly positioned, the power control operation of different terminals can be specifically distinguished according to the cell interference condition, the purposes of reducing the inter-cell interference and improving the terminal perception are achieved, and the algorithm of the embodiment of the invention has low complexity and is easy to realize.
The following describes in detail the uplink power control method provided in the embodiment of the present invention, as shown in fig. 3, including:
In the embodiment of the invention, a base station determines an interference neighbor set of a terminal under the base station, wherein the interference neighbor set is used for representing a neighbor interfered by the terminal; the base station determines a power control indication type of the terminal according to the interfered type of each adjacent cell in the interfered adjacent cell set, wherein the interfered type of each adjacent cell is used for indicating the interfered degree of each adjacent cell; and the base station controls the uplink power of the terminal according to the determined power control indication type. Because the interference adjacent cell of the terminal is determined, and the power of the terminal is controlled according to the interference type of the adjacent cell, the uplink power of the terminal in the interference source of the adjacent cell can be accurately reduced to realize the reduction of the interference between the cells, and the uplink power of the non-interference source terminal is accurately improved to increase the utilization of system resources, so that the performance of the terminal is improved, and the overall throughput of the system is also improved.
Based on the same technical concept, an embodiment of the present invention further provides a base station, as shown in fig. 4, including:
an interfering neighbor cell determining unit 401, configured to determine an interfering neighbor cell set of a terminal in a base station, where the interfering neighbor cell set is used to represent a neighbor cell interfered by the terminal;
a power control indication type determining unit 402, configured to determine a power control indication type of the terminal according to an interfered type of each neighboring cell in the interfering neighboring cell set, where the interfered type of each neighboring cell is used to indicate an interfered degree of each neighboring cell;
a control unit 403, configured to control the uplink power of the terminal according to the determined power control indication type.
Optionally, the interfering neighboring cell determining unit 401 is specifically configured to:
determining adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal;
determining a position state of the terminal, wherein the position state is used for indicating the relative position of the terminal under the base station;
if the position state is a cell center, using a set formed by all adjacent cells except a target adjacent cell in the adjacent cells of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cells of the terminal is smaller than a preset interference threshold;
and if the position state is the cell edge, taking a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
Optionally, the interfering neighboring cell determining unit 401 is specifically configured to:
determining adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal;
determining a quality state of the terminal, wherein the quality state is used for indicating that the terminal is interfered under the base station;
if the quality state is not interfered, taking a set formed by all adjacent cells except a target adjacent cell in the adjacent cell of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cell of the terminal is smaller than a preset interference threshold;
and if the quality state is interfered, taking a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
Optionally, the power control indication type determining unit 402 is specifically configured to:
if the interfered type of at least one adjacent cell in the interference adjacent cell set is strong interference, determining that the power control indication type of the terminal is power control limitation;
if the interfered types of all the adjacent cells in the interfered adjacent cell set are not strong interference and the interfered type of at least one adjacent cell is medium interference, determining the power control indication type of the terminal as power control retention;
and if the interfered types of all the adjacent cells in the interfered adjacent cell set are low interference, determining the power control indication type of the terminal as power control promotion.
Optionally, the control unit 403 is specifically configured to:
if the power control indication type of the terminal is power control limitation, reducing the increasing step length in uplink inner loop power control of the terminal and reducing the target signal-to-interference ratio in uplink outer loop power control of the terminal;
if the power control indication type of the terminal is power control maintenance, maintaining an original power control strategy for the terminal;
and if the power control indication type of the terminal is power control promotion, increasing the increasing step length in the uplink inner loop power control of the terminal and increasing the target signal-to-interference ratio in the uplink outer loop power control of the terminal.
In the embodiment of the invention, a base station determines an interference neighbor set of a terminal under the base station, wherein the interference neighbor set is used for representing a neighbor interfered by the terminal; the base station determines a power control indication type of the terminal according to the interfered type of each adjacent cell in the interfered adjacent cell set, wherein the interfered type of each adjacent cell is used for indicating the interfered degree of each adjacent cell; and the base station controls the uplink power of the terminal according to the determined power control indication type. Because the interference adjacent cell of the terminal is determined, and the power of the terminal is controlled according to the interference type of the adjacent cell, the uplink power of the terminal in the interference source of the adjacent cell can be accurately reduced to realize the reduction of the interference between the cells, and the uplink power of the non-interference source terminal is accurately improved to increase the utilization of system resources, so that the performance of the terminal is improved, and the overall throughput of the system is also improved.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. An uplink power control method, comprising:
a base station determines an interference neighbor set of a terminal under the base station, wherein the interference neighbor set is used for representing a neighbor interfered by the terminal;
the base station determines a power control indication type of the terminal according to the interfered type of each adjacent cell in the interfered adjacent cell set, wherein the interfered type of each adjacent cell is used for indicating the interfered degree of each adjacent cell;
the base station controls the uplink power of the terminal according to the determined power control indication type;
the method for determining the interference neighbor set of the terminal under the base station by the base station comprises the following steps:
the base station determines the adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal; the base station determines the position state of the terminal, wherein the position state is used for indicating the relative position of the terminal under the base station; if the position state is a cell center, the base station takes a set formed by all adjacent cells except a target adjacent cell in the adjacent cells of the terminal as an interference adjacent cell set of the terminal, and the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cell of the terminal is smaller than a preset interference threshold; if the position state is a cell edge, the base station takes a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal; alternatively, the first and second electrodes may be,
the base station determines the adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal; the base station determines the quality state of the terminal, wherein the quality state is used for indicating the interference condition of the terminal under the base station; if the quality state is not interfered, the base station takes a set formed by all adjacent cells except a target adjacent cell in the adjacent cells of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cell of the terminal is smaller than a preset interference threshold; and if the quality state is interfered, the base station takes a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
2. The method of claim 1, wherein the determining, by the base station, the power control indication type of the terminal according to the interfered type of each neighboring cell in the interfering neighboring cell set comprises:
if the interfered type of at least one adjacent cell in the interference adjacent cell set is strong interference, the base station determines that the power control indication type of the terminal is power control limitation;
if the interfered types of all the adjacent cells in the interfered adjacent cell set are not strong interference and the interfered type of at least one adjacent cell is medium interference, the base station determines the power control indication type of the terminal as power control retention;
and if the interfered types of all the adjacent cells in the interfered adjacent cell set are low interference, the base station determines the power control indication type of the terminal as power control promotion.
3. The method according to claim 1 or 2, wherein the controlling, by the base station, the uplink power of the terminal according to the determined power control indication type includes:
if the power control indication type of the terminal is power control limitation, the base station reduces the increase step length in the uplink inner loop power control of the terminal and reduces the target signal-to-interference ratio in the uplink outer loop power control of the terminal;
if the power control indication type of the terminal is power control maintenance, the base station maintains an original power control strategy for the terminal;
and if the power control indication type of the terminal is power control improvement, the base station increases the increase step length in the uplink inner loop power control of the terminal and increases the target signal-to-interference ratio in the uplink outer loop power control of the terminal.
4. A base station, comprising:
an interference neighbor cell determining unit, configured to determine an interference neighbor cell set of a terminal in a base station, where the interference neighbor cell set is used to represent a neighbor cell interfered by the terminal;
a power control indication type determining unit, configured to determine a power control indication type of the terminal according to an interfered type of each neighboring cell in the interfering neighboring cell set, where the interfered type of each neighboring cell is used to indicate an interfered degree of each neighboring cell;
a control unit, configured to control uplink power of the terminal according to the determined power control indication type;
the interfering neighbor cell determining unit is specifically configured to:
determining adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal; determining a position state of the terminal, wherein the position state is used for indicating the relative position of the terminal under the base station; if the position state is a cell center, using a set formed by all adjacent cells except a target adjacent cell in the adjacent cells of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cells of the terminal is smaller than a preset interference threshold; if the position state is a cell edge, taking a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal; alternatively, the first and second electrodes may be,
determining adjacent cells of the terminal and the reference signal receiving power of each adjacent cell according to the measurement information reported by the terminal; determining a quality state of the terminal, wherein the quality state is used for indicating that the terminal is interfered under the base station; if the quality state is not interfered, taking a set formed by all adjacent cells except a target adjacent cell in the adjacent cell of the terminal as an interference adjacent cell set of the terminal, wherein the target adjacent cell is an adjacent cell of which the reference signal receiving power in the adjacent cell of the terminal is smaller than a preset interference threshold; and if the quality state is interfered, taking a set formed by adjacent cells of the terminal as an interference adjacent cell set of the terminal.
5. The base station of claim 4, wherein the power control indication type determining unit is specifically configured to:
if the interfered type of at least one adjacent cell in the interference adjacent cell set is strong interference, determining that the power control indication type of the terminal is power control limitation;
if the interfered types of all the adjacent cells in the interfered adjacent cell set are not strong interference and the interfered type of at least one adjacent cell is medium interference, determining the power control indication type of the terminal as power control retention;
and if the interfered types of all the adjacent cells in the interfered adjacent cell set are low interference, determining the power control indication type of the terminal as power control promotion.
6. The base station according to claim 4 or 5, wherein the control unit is specifically configured to:
if the power control indication type of the terminal is power control limitation, reducing the increasing step length in uplink inner loop power control of the terminal and reducing the target signal-to-interference ratio in uplink outer loop power control of the terminal;
if the power control indication type of the terminal is power control maintenance, maintaining an original power control strategy for the terminal;
and if the power control indication type of the terminal is power control promotion, increasing the increasing step length in the uplink inner loop power control of the terminal and increasing the target signal-to-interference ratio in the uplink outer loop power control of the terminal.
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| CN201710096611.4A CN106793047B (en) | 2017-02-22 | 2017-02-22 | Uplink power control method and base station |
| PCT/CN2017/117268 WO2018153152A1 (en) | 2017-02-22 | 2017-12-19 | Uplink power control method, and base station |
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| CN106793047B (en) * | 2017-02-22 | 2020-01-14 | 京信通信系统（中国）有限公司 | Uplink power control method and base station |
| WO2019028898A1 (en) * | 2017-08-11 | 2019-02-14 | 华为技术有限公司 | Power control method, network device and terminal device |
| CN109041009B (en) * | 2018-07-06 | 2020-03-17 | 北京科技大学 | Internet of vehicles uplink power distribution method and device |
| CN109151972B (en) * | 2018-10-31 | 2021-12-17 | 京信网络系统股份有限公司 | Uplink power control method, device, computer equipment and storage medium |
| CN113395778A (en) * | 2020-03-11 | 2021-09-14 | 索尼公司 | Electronic device, wireless communication method, and computer-readable storage medium |
| CN112312533B (en) * | 2020-11-05 | 2023-05-12 | 京信网络系统股份有限公司 | Power adjustment method, device, access network equipment and storage medium |
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| CN103535086A (en) * | 2013-05-16 | 2014-01-22 | 华为技术有限公司 | Uplink power control method and base station |
| CN104202807A (en) * | 2014-08-26 | 2014-12-10 | 京信通信系统（中国）有限公司 | Method and system for controlling uplink power |
| CN105323776A (en) * | 2014-05-29 | 2016-02-10 | 普天信息技术有限公司 | Uplink interference coordination method |
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| CN101873686A (en) * | 2009-04-23 | 2010-10-27 | 上海无线通信研究中心 | Power control method of TD-LTE (TD-SCDMA Long Term Evolution) system |
| US9319997B2 (en) * | 2012-09-18 | 2016-04-19 | Qualcomm Incorporated | Apparatus, method, and system for uplink power control in a heterogeneous wireless communication network |
| CN104717733B (en) * | 2013-12-13 | 2018-06-15 | 中国移动通信集团公司 | A kind of method and apparatus for adjusting terminal uplink transmission power |
| CN104811989B (en) * | 2015-04-30 | 2018-09-25 | 上海大唐移动通信设备有限公司 | A kind of interfered cell determines method and device |
| CN106793047B (en) * | 2017-02-22 | 2020-01-14 | 京信通信系统（中国）有限公司 | Uplink power control method and base station |
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| CN103535086A (en) * | 2013-05-16 | 2014-01-22 | 华为技术有限公司 | Uplink power control method and base station |
| CN105323776A (en) * | 2014-05-29 | 2016-02-10 | 普天信息技术有限公司 | Uplink interference coordination method |
| CN104202807A (en) * | 2014-08-26 | 2014-12-10 | 京信通信系统（中国）有限公司 | Method and system for controlling uplink power |
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