CN107925961B

CN107925961B - Method for adjusting power in wireless communication and wireless access point

Info

Publication number: CN107925961B
Application number: CN201580078900.0A
Authority: CN
Inventors: 庄宏成; 张洁涛; 安德里安·别列茨基
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-04-17
Filing date: 2015-04-17
Publication date: 2020-09-29
Anticipated expiration: 2035-04-17
Also published as: CN107925961A; WO2016165141A1

Abstract

The invention discloses a method for adjusting power in wireless communication and a wireless access point, wherein the method for adjusting power in wireless communication comprises the following steps: a wireless access point determines an energy saving load threshold of a first cell controlled by the wireless access point (110); the wireless access point controls a transmit power of the first cell based on the energy saving load threshold, the transmit power of the first cell comprising a transmit power of a data channel (120). The method for adjusting power in wireless communication and the wireless access point of the embodiment of the invention can adjust the transmitting power of the cell according to the dynamic change of the load of the cell, thereby realizing distributed control of the transmitting power of each cell and being beneficial to reducing the power consumption of the whole network and the interference among network devices.

Description

Method for adjusting power in wireless communication and wireless access point

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a method for adjusting power in wireless communication and a wireless access point.

Background

In order to improve the Network capacity, the miniaturization and the densification of access points of a wireless Network are the development trend of the wireless Network, and a dense wireless access Network (English: Ultra-dense Network, abbreviated as UDN) improves the regional throughput of the system by increasing short-distance user access as much as possible.

The mobility of users and the time varying nature of the traffic result in the system capacity requirements of the network being dynamically changing, and such changes can be more dynamic in dense networks. Under the condition of fully exerting the service efficiency of the network, the energy consumption efficiency needs to be effectively improved.

In the traditional method, the network energy saving is based on the distribution of users and services, and the wireless access point is dynamically turned off. And the energy consumption efficiency is improved through dynamic network topology control. However, this method requires collecting information of users and neighboring cells, has a large signaling overhead, is generally suitable for large time granularity control, and is often based on centralized control.

Disclosure of Invention

The embodiment of the invention provides a method for adjusting power in wireless communication and a wireless access point, which can adjust the transmitting power of each cell in a distributed manner and are beneficial to reducing the power consumption and interference of each network device.

In a first aspect, a method for adjusting power in wireless communication is provided, the method comprising: a wireless access point determines an energy-saving load threshold of a first cell controlled by the wireless access point; and the wireless access point controls the transmission power of the first cell according to the energy-saving load threshold, wherein the transmission power of the first cell comprises the transmission power of a data channel.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the wireless access point, an energy saving load threshold of a first cell controlled by the wireless access point includes: the wireless access point acquires the load information of the first cell in the current period; and the wireless access point determines an energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the determining, by the wireless access point, an energy-saving load threshold of the first cell in a next period according to the load information of the first cell in the current period includes: the wireless access point acquires load information of a second cell in the current period and determines a load average value of the first cell and the second cell in the current period; the wireless access point acquires a network load balancing target value; and the wireless access point determines the energy-saving load threshold of the first cell according to the load average value of the current period and the network load balancing target value.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the determining, by the wireless access point, an energy-saving load threshold of the first cell in a next period according to the load information of the first cell in the current period includes: the wireless access point reports the load information of the first cell in the current period to a controller, and the load information of the first cell in the current period is used by the controller to determine an energy-saving load threshold of the first cell in the next period; (ii) a And receiving an energy-saving load threshold of the first cell in the next period, which is sent by the controller.

With reference to the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the determining, by the wireless access point, an energy-saving load threshold of the first cell in a next period according to the load information of the first cell in the current period includes: the wireless access point determines the current load variation of the first cell according to the load information of the first cell in the last period and the load information of the first cell in the current period; the wireless access point acquires a network load balancing target value; and the wireless access point determines an energy-saving load threshold of the first cell according to the load variation of the first cell and the load balancing target value.

With reference to the first aspect or any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the controlling, by the wireless access point, the transmission power of the cell according to the energy-saving load threshold includes: determining, by the wireless access point, a current load of the first cell; if the current load of the first cell is smaller than the energy-saving load threshold, the wireless access point determines the reduction amplitude of the transmission power of the first cell according to the current transmission power of the first cell; and the wireless access point executes the reduction operation of the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the performing, by the wireless access point, an operation of reducing the current transmission power of the first cell according to the reduction degree of the transmission power of the first cell includes: and the wireless access point sets the sum of the current transmitting power of the first cell and the reduction amplitude as the transmitting power of the first cell after adjustment, and the transmitting power of the first cell after adjustment is larger than a power minimum threshold value.

With reference to the fifth possible implementation manner of the first aspect, in another possible implementation manner of the first aspect, the performing, by the wireless access point, an operation of reducing the transmission power of the first cell according to the reduction degree of the transmission power of the first cell includes: and if the difference between the current transmitting power of the first cell and the reduction amplitude of the transmitting power of the first cell is larger than a power minimum threshold value, updating the transmitting power of the first cell to be the difference between the current transmitting power of the first cell and the reduction amplitude.

With reference to the first aspect or any one of the first to sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the transmit power of the first cell includes a transmit power of a control channel.

With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the method further includes: determining, by the wireless access point, a magnitude of reduction in transmit power of the first cell as an offset parameter for the first cell; and sending the offset parameter of the cell to user equipment, so that the user equipment performs cell reselection operation according to the offset parameter.

In a second aspect, a wireless access point is provided, comprising: a first determining unit, configured to determine an energy saving load threshold of a first cell controlled by the radio access point; a control unit, configured to control the transmit power of the first cell according to the energy saving load threshold determined by the determining unit, where the transmit power of the first cell includes a transmit power of a data channel.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the wireless access point further includes an obtaining unit, where the obtaining unit is configured to: acquiring load information of the first cell in a current period; and determining the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the obtaining unit is specifically configured to: acquiring load information of a second cell in the current period, and determining a load average value of the first cell and the second cell in the current period; acquiring a network load balancing target value; and determining the energy-saving load threshold of the first cell according to the load average value of the current period and the network load balancing target value.

With reference to the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the obtaining unit further includes: a first sending unit, configured to report load information of the first cell in a current period to a controller, where the controller is used for the controller to determine an energy saving load threshold of the first cell in a next period according to the load information of the first cell in the current period; a receiving unit, configured to receive an energy saving load threshold of the first cell in a next period, where the energy saving load threshold is sent by the controller.

With reference to the first possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the obtaining unit is specifically configured to: acquiring load information of the first cell in a last period and load information of the first cell in a current period, and determining a current load variation of the first cell according to the load information of the first cell in the last period and the load information of the first cell in the current period; acquiring a network load balancing target value; and determining the energy-saving load threshold of the first cell according to the load variation of the first cell and the load balancing target value.

With reference to the second aspect or any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the first aspect, the control unit includes a second determining unit, and the second determining unit is configured to: determining a current load of the first cell; the second determining unit is configured to determine, when the current load of the first cell is smaller than the energy-saving load threshold, a reduction range of the transmission power of the first cell according to the current transmission power of the first cell; the control unit is specifically configured to: and executing the reduction operation of the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell.

With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the control unit is specifically configured to: and setting the sum of the current transmitting power and the reduction amplitude of the first cell as the transmitting power of the first cell after adjustment, wherein the transmitting power of the first cell after adjustment is larger than a power minimum threshold value.

With reference to the fifth possible implementation manner of the second aspect, in another possible implementation manner of the second aspect, the control unit is specifically configured to: and if the difference between the current transmitting power of the first cell and the reduction amplitude of the transmitting power of the first cell is larger than a power minimum threshold value, updating the transmitting power of the first cell to be the difference between the current transmitting power of the first cell and the reduction amplitude.

With reference to the second aspect or any one of the first to sixth possible implementation manners of the second aspect, in a seventh possible implementation manner of the second aspect, the transmit power of the first cell includes a transmit power of a control channel.

With reference to the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner of the second aspect, the wireless access point further includes: a third determining unit, configured to determine a magnitude of reduction of the transmission power of the first cell as an offset parameter of the first cell; and the second sending unit is used for sending the offset parameter of the cell so as to be used for the user equipment to perform cell reselection operation according to the offset parameter.

Based on the above technical solution, the method for adjusting power in wireless communication and the wireless access point in the embodiments of the present invention can adjust the transmission power of the cell according to the energy-saving load threshold of the cell, thereby implementing distributed control of the transmission power of each cell, and facilitating reduction of power consumption of the entire access network and interference between each network device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below 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 creative efforts.

Fig. 1 is a schematic flow chart of a method of adjusting power in wireless communication according to an embodiment of the present invention.

Fig. 2 is a schematic flow chart of a method for adjusting power in wireless communication according to an embodiment of the present invention.

Fig. 3 is a schematic flow chart of a method for adjusting power in wireless communication according to another embodiment of the present invention.

Fig. 4 is a schematic block diagram of a wireless access point according to an embodiment of the present invention.

Fig. 5 is a schematic block diagram of a wireless access point of another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example: a Global System for Mobile communication ("GSM") System, a code Division Multiple Access ("CDMA") System, a Wideband code Division Multiple Access ("WCDMA") System, a General packet radio Service ("GPRS"), a Long Term Evolution ("LTE") System, a LTE Frequency Division Duplex ("FDD") System, a LTE Time Division Duplex ("TDD") System, a WiMAX (Universal Mobile telecommunications System, "UMTS") System, or a world wide Interoperability microwave Access ("UMTS") communication System.

It should also be understood that, in the embodiment of the present invention, a User Equipment (User Equipment, abbreviated as "UE") may be referred to as a Terminal (Terminal), a Mobile Station (Mobile Station, abbreviated as "MS"), a Mobile Terminal (Mobile Terminal), or the like, and the User Equipment may communicate with one or more core networks via a Radio Access Network (RAN), for example, the User Equipment may be a Mobile phone (or referred to as a "cellular" phone) or a computer with a Mobile Terminal, for example, the User Equipment may also be a portable, pocket, hand-held, computer-embedded, or vehicle-mounted Mobile device, and they exchange voice and/or data with the RAN.

It should also be understood that, in the embodiment of the present invention, a wireless Access point may be used for communicating with a terminal device, and the wireless Access point may be a Base Transceiver Station (BTS) in a Global System for Mobile communication (GSM) System or Code Division Multiple Access (CDMA), a Base station NodeB (NB) in a Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB) or eNodeB) in a Long Term Evolution (LTE), or an Access Point (AP) in a WLAN, and the wireless Access point may be a relay station, a WLAN AP, a vehicle-mounted device, a wearable device, a Base station device in a future 5G network, and the like.

Fig. 1 shows a schematic flow diagram of a method 100 of adjusting power in wireless communication according to an embodiment of the present invention. As shown in fig. 1, the method 100 includes:

in step 110, the wireless access point determines an energy saving load threshold of a first cell controlled by the wireless access point.

Step 120, the wireless access point controls the transmission power of the first cell according to the energy-saving load threshold, and the transmission power of the first cell includes the transmission power of the data channel.

Specifically, in step 110, one wireless access point may have only one cell or multiple cells, so that the first cell may represent one or more cells controlled by the wireless access point, and the load of a certain cell may be represented by a ratio of the radio resources required by the user equipment in the cell to all the radio resources in the cell.

Optionally, as an embodiment of the present invention, the determining, by the wireless access point, an energy saving load threshold of the first cell controlled by the wireless access point includes: the wireless access point acquires the load information of the first cell in the current period; and the wireless access point determines the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period.

Specifically, the adjustment of the transmission power of the first cell is performed based on an energy saving load threshold of the first cell, and if the energy saving load threshold is set too high, the access of the user equipment is affected, and if the energy saving load threshold is set too low, the energy saving effect is affected. Therefore, the energy-saving load threshold needs to be set according to the service distribution of the user, that is, the energy-saving load threshold is set based on the load condition of the cell. It should be understood that the cell load is defined as the ratio between the radio resources required to serve the user equipment and all radio resources.

It should be understood that the length of the current period or the next period for the wireless access point to obtain the load information of the first cell may be determined according to the load change condition of the first cell, and the load information of the first cell may be the average load of the first cell in the period, which is not limited by the present invention.

It should also be understood that the length of the current period or the next period during which the wireless access point obtains the first cell load information may be determined according to the load change condition of the first cell, for example, the current period or the next period may be set as a cell load change period, where the next period refers to a period of time after the current period, and the length of the next period may be the same as or different from the current period, and the load information of the first cell may be an average load of the first cell in the period, which is not limited in this disclosure. Specifically, the energy-saving load threshold of the first cell in the next period may be determined according to the load threshold of the current period, so that energy-saving control of the corresponding small time granularity may be performed according to dynamic changes of the system load, and further, distributed efficient control may be implemented.

Optionally, as an embodiment of the present invention, the determining, by the wireless access point, the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period includes: the wireless access point acquires the load information of the second cell in the current period and determines the load average value of the first cell and the second cell in the current period; a wireless access point acquires a network load balancing target value; and the wireless access point determines the energy-saving load threshold of the first cell according to the load mean value of the current period and the network load balancing target value.

Specifically, the second cell refers to one or more cells other than the first cell in the entire network, for example, the second cell may be a cell controlled by a neighbor access point of the wireless access point, which is described above, and the present invention is not limited thereto. The wireless access point may determine the average load value in the current period according to the load information of the first cell and the second cell in the current period.

Specifically, the wireless access point may obtain the network load balancing target value according to an operator policy or an access control threshold of the wireless access point.

Specifically, the wireless access point determines an energy-saving load threshold of the first cell according to the load average value of the current period and the network load balancing target value, and may calculate an energy-saving load threshold value of each cell according to formula (1), where the formula (1) is as follows:

ρ_thr＝αρ_avg+(1-α)ρ_tar(1)

here, α is a smoothing coefficient, and may be set to 0.5 ρ, for example_thrIs the energy-saving load threshold, rho, of the cell_avgIs the target value of network load balancing.

It should be understood that the wireless access point may set the energy saving load threshold of the first cell, and may also send the energy saving load threshold of the first cell to other wireless access points in the network, so that the other wireless access points may set according to the energy saving load threshold, thereby controlling the cell transmission power according to the energy saving load threshold.

Optionally, as an embodiment of the present invention, the determining, by the wireless access point, the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period includes: the wireless access point reports the load information of the first cell in the current period to the controller, and the load information of the first cell in the current period is used for the controller to determine the energy-saving load threshold of the first cell in the next period; and receiving the energy-saving load threshold of the first cell in the next period sent by the controller.

It should be understood that the controller may be located at a wireless access point or may be independent of any wireless access point as a stand-alone network device.

Optionally, the controller may configure the energy saving load threshold of each wireless access point in a unified manner, that is, may configure the energy saving load threshold of each cell in a unified manner, and the specific steps are as follows: the controller acquires the load balance values of all cells in a first period; the controller obtains a target value of network load balancing, wherein the target value can be obtained based on an operator strategy or set based on an access control threshold of a wireless access point, and the invention is not limited to the target value; the controller determines an energy-saving load threshold of each wireless access point according to the load balancing value and the smooth average value of the load balancing target value, and sends the energy-saving load threshold to each wireless access point, so that each wireless access point can carry out uniform configuration according to the energy-saving load threshold.

Specifically, the controller determines an energy-saving load threshold according to the load mean value of each cell in the current period and the network load balancing target value, and may calculate the energy-saving load threshold according to a formula (1), where the formula (1) is as follows:

ρ_thr＝αρ_avg+(1-α)ρ_tar(1)

Optionally, as an embodiment of the present invention, the determining, by the wireless access point, the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period includes: the wireless access point determines the current load variation of the first cell according to the load information of the first cell in the previous period and the load information of the first cell in the current period; a wireless access point acquires a network load balancing target value; and the wireless access point determines the energy-saving load threshold of the first cell according to the load variation of the first cell and the load balancing target value.

Specifically, the wireless access point may configure the energy saving load threshold of the first cell separately, specifically, for example, when configuring the energy saving load threshold of the first cell separately, the specific steps are as follows: counting the load and the load variation trend in a first period of a first cell; the target value of the load balancing of the whole network is obtained, and specifically, the target value of the load balancing of the whole network can be obtained through a network management system, or through a controller or through table lookup. Determining an energy-saving load threshold value according to a formula (2) by the wireless access point with the load smaller than the target value of the whole network load balance, wherein the formula (2) is as follows:

ρ_thr,i＝ρ_tar-ρ_tarsign(Δρ_i)Δρ_tar(2)

Δρ_tarthe threshold preset for the system may be set to 10%. sign (Δ ρ)_i) The load of the cell i is changed, when the load is smaller, the value is-1, when the load is larger, the value is +1, otherwise, the value is 0. When the load of the cell is reduced, the energy-saving load threshold is above the target value of the load balance of the whole network, and the amplitude is a preset threshold; otherwise, the energy-saving load threshold is below the target value of the whole network load balance, and the amplitude is a preset threshold.

Optionally, as an embodiment of the present invention, the controlling, by the wireless access point, the transmission power of the cell according to the energy saving load threshold includes: the wireless access point determines the current load of the first cell; if the current load of the first cell is smaller than the energy-saving load threshold, the wireless access point determines the reduction amplitude of the transmission power of the first cell according to the current transmission power of the first cell; and the wireless access point performs the operation of reducing the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell.

Specifically, the wireless access point may select different times to measure the current load condition of the first cell according to an actual condition, and if the current load measured by the first cell at the first time is smaller than the energy-saving load threshold, the wireless access point may determine a reduction range of the transmission power of the first cell according to the current transmission power of the first cell, specifically, may determine a range of power adjustment according to formula (3), where formula (3) is as follows:

wherein p is_n,iIs the current transmission power, rho, of the ith cell_n,iAnd ρ_thr,iRespectively the current measurement load and the energy-saving load threshold of the ith cell.

Optionally, as an embodiment of the present invention, the performing, by the wireless access point, an operation of reducing the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell includes: and if the difference between the current transmitting power of the first cell and the reduction amplitude of the transmitting power of the first cell is larger than the power minimum threshold value, updating the transmitting power of the first cell to be the difference between the current transmitting power of the first cell and the reduction amplitude.

Optionally, as an embodiment of the present invention, the performing, by the wireless access point, an operation of reducing the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell includes: and the wireless access point executes the reduction operation of the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell and the power minimum threshold value.

Optionally, as an embodiment of the present invention, if a difference between a current transmission power of the first cell and a reduction amplitude of the transmission power of the first cell is greater than a power minimum threshold, the wireless access point reduces the current transmission power, otherwise, the transmission power is not reduced.

It should be understood that the wireless access point continues to measure the current load of the first cell at the second time, and when the current load of the first cell at the second time is less than the energy-saving load threshold, the wireless access point continues to perform the operation of reducing the current transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell, wherein the second time occurs after the first time.

It should be understood that the operation of reducing the transmission power of the first cell is performed only when the sum of the current transmission power of the first cell and the reduction amplitude of the transmission power of the first cell is greater than the power minimum threshold value.

Specifically, the adjusted transmit power may be determined according to equation (4), where equation (4) is shown as follows:

p_n+1,i＝Δp_n+1,i+p_n,i(4)

the method provided by the embodiment of the invention can dynamically adjust the transmitting power, can adapt to the dynamic change of the load, can reduce the energy consumption after the transmitting power of the low-load cell is reduced, simultaneously reduces the interference to other cells or wireless access points, simultaneously can reduce the load of other high-load wireless access points, and the load of the whole network tends to be balanced.

Optionally, as an embodiment of the present invention, the transmission power of the first cell further includes a transmission power of a control channel.

Specifically, when the control channel and the data channel are separated, adjusting only the transmission power of the data channel does not affect the control channel, and therefore, the association relationship between the user equipment and each cell is not changed; when the data channel and the control channel are unified, for example, in a wireless local area network, the power of the data channel is adjusted and the control channel is also adjusted, that is, the embodiment of the present invention is also used for saving the transmission power of the control channel.

Optionally, as an embodiment of the present invention, the method further includes: the wireless access point determines an offset parameter of the first cell according to the reduction amplitude of the transmitting power of the first cell; and sending the offset parameter of the cell to the user equipment, so that the user equipment performs cell reselection operation according to the offset parameter.

Specifically, the offset of the first cell may be determined according to equation (5), where equation (5) is shown as follows:

Offset_n+1,i＝-Δp_n+1,i(5)

wherein, Offset_n+1,iIs the cell offset after the adjustment, delta p_n+1,iThe current power reduction magnitude for wireless access point i.

The method provided by the embodiment of the invention can send the cell offset parameter to the user equipment, so that the user equipment keeps the same user association and unnecessary switching is reduced.

Optionally, as an embodiment of the present invention, when the user equipment receives the cell offset parameter sent by the wireless access point, the cell reselection operation needs to be performed according to the cell offset parameter.

Specifically, the user equipment generally selects a cell with the highest received signal strength when selecting, reselecting or camping on the cell. When the control channel power of the serving cell is adjusted, the user equipment in the cell will perform the following adjustment according to the received cell offset parameter, as shown in equation (6):

the RSRP is a Reference Signal Received Power (RSRP), that is, the ue selects a cell with the largest sum of the RSRP and the cell offset parameter as a serving cell.

Specifically, the ue also depends on the received signal changes of the serving cell and the neighboring cell when making a handover decision, and the cell offset parameter needs to be considered in this case, which is not limited in this invention.

Fig. 2 is a schematic flow chart of a method for adjusting power in wireless communication according to an embodiment of the present invention. As shown in fig. 2, the method includes:

step 210, determining an energy saving load threshold of each wireless access point based on the distribution statistics of the user services.

Step 220, the wireless access point with the current load lower than the energy-saving load threshold adjusts the transmitting power of the wireless access point.

Step 230, the wireless access point with the current load lower than the energy saving load threshold determines the cell offset parameter according to the transmitting power of the wireless access point, and sends the offset parameter to the user equipment.

In step 240, the ue selects, camps on, or switches the cell based on the offset parameter of the cell.

In step 210, each wireless access point may individually configure the energy saving load threshold, or may be configured by a certain wireless access point or a controller in a unified manner, which is not limited in the present invention.

Specifically, the step of uniformly setting the energy-saving load threshold of each wireless access point by the controller is as follows:

1) each wireless access point periodically counts the load of the wireless access point and reports the load to the controller;

2) the controller calculates the mean ρ of the loads of all wireless access points_avg；

3) The controller obtains a target value rho of network load balance_tarThe target value can be set based on the policy of the operator or based on the access control threshold of the wireless access point;

4) the controller determines the smooth average value of the load mean value and the load balancing target value as an energy-saving load threshold of each wireless access point:

ρ_thr＝αρ_avg+(1-α)ρ_tar

α is a smoothing coefficient, and may be set to 0.5 ρ_thrAnd all the wireless access points under the controller are uniformly set for the energy-saving load threshold of the wireless access points.

Specifically, the step of configuring the energy saving load threshold by each wireless access point separately is as follows:

1) and each wireless access point periodically counts the load and the load change trend:

Δρ_i＝ρ_cur,i-ρ_prv,i

where ρ is_cur,iAnd ρ_prv,iRespectively the current load and the last statistical load of the wireless access point i;

2) obtaining a target value rho of load balance of the whole network_tar；

3) Determining an energy-saving load threshold of a wireless access point with a load smaller than a target value of the whole network load balance:

ρ_thr,i＝ρ_tar-ρ_tarsign(Δρ_i)Δρ_tar

wherein, Δ ρ_tarThe threshold preset for the system may be set to 10%. sign (Δ ρ)_i) The load of the wireless access point i is changed, when the load is smaller, the value is-1, when the load is larger, the value is +1, otherwise, the value is 0. When the load of the wireless access point is reduced, the energy-saving load threshold is above the target value of the load balance of the whole network, and the amplitude is a preset threshold; otherwise, the energy-saving load threshold is below the target value of the whole network load balance, and the amplitude is a preset threshold.

In step 220, specifically, the step of adjusting the transmission power by each wireless access point is as follows:

1) each wireless access point measuring its load;

2) if the measured load is smaller than the energy-saving load threshold, continuing to participate in power adjustment, otherwise, not adjusting;

3) determining a magnitude of the power adjustment;

4) adjusting power based on the amplitude, wherein if the adjusted power is greater than the power minimum threshold and the measured load is less than the energy-saving load threshold, continuing to adjust, otherwise, not adjusting;

the lowest threshold of power is to ensure certain network coverage and Quality of service (QoS), and in a dense network scenario, the lowest threshold may be set very small;

5) the wireless access point sends the new cell offset parameter to the user to keep the same user association and reduce unnecessary switching.

In step 240, when the user receives the cell offset parameter sent by the wireless access point, it needs to be applied in time. Generally, operations related to the power domain, such as cell reselection, handover decision, etc., need to be adjusted accordingly, and specifically, a user may perform the following operations:

1) cell reselection

The user typically selects the cell with the highest received signal strength when selecting/reselecting/camping on the cell. When the pilot power of the serving cell is adjusted, the user in the cell receives the cell offset parameter, and then the cell is selected as follows:

2) handover decision

The handover decision is also related to the operation of the power domain, depending on the received signal changes of the serving cell and the neighbor cell, when the cell offset needs to be added as well.

Fig. 3 is a schematic flow chart of a method 300 for energy conservation in a dense radio access network according to an embodiment of the present invention. The method 300 may be performed by a wireless access point, as shown in fig. 3, the method comprising:

step 301, measuring the current load.

Step 302, judging whether the current load is smaller than an energy-saving load threshold, if the current load is not smaller than the energy-saving load threshold, ending the power adjustment; and if the current load is less than the energy-saving load threshold, continuing to participate in the adjustment of the transmission power.

Step 303, determine the magnitude of the power adjustment.

And 304, adjusting power based on the power adjustment amplitude.

Step 305, determine whether the adjusted transmit power is greater than the minimum threshold power. If the adjusted transmitting power is not higher than the lowest threshold power, the power adjustment is finished; if the adjusted transmitting power is higher than the lowest threshold power, further judging whether the current load is still smaller than the energy-saving load threshold, and if the current load is smaller than the energy-saving load threshold, continuing to adjust the transmitting power.

In step 303, the magnitude of each power adjustment needs to be determined. Specifically, the magnitude of the power adjustment may be determined according to equation (3), where equation (3) is as follows:

In step 304, a power adjustment is made based on the power adjustment magnitude. Specifically, the adjusted transmit power may be determined according to equation (4), where equation (4) is shown as follows:

p_n+1,i＝Δp_n+1,i+p_n,i(4)

The method for energy saving of the dense radio access network according to the embodiment of the present invention is described in detail above with reference to fig. 1 to 3, and the apparatus for energy saving of the dense radio access network according to the embodiment of the present invention is described below with reference to fig. 4 to 5.

As shown in fig. 4, the wireless access point 400 according to an embodiment of the present invention includes:

a first determining unit 410, configured to determine an energy saving load threshold of a first cell controlled by a wireless access point.

A control unit 420, configured to control a transmission power of the first cell according to the energy saving load threshold determined by the determining unit, where the transmission power of the first cell includes a transmission power of a data channel.

Specifically, a wireless access point may have only one cell or may have multiple cells, so that the first cell may represent one or more cells controlled by the wireless access point, and the load of a certain cell may be represented by a ratio of radio resources required by user equipment in the cell to all radio resources of the cell.

Optionally, as an embodiment of the present invention, the wireless access point further includes an obtaining unit, where the obtaining unit is configured to: acquiring load information of a first cell in a current period; and acquiring the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period.

It should also be understood that the acquiring unit may be located at a certain wireless access point, or may be used as a single device to uniformly control each wireless access point in the network, and the present invention is not limited thereto.

Optionally, as an embodiment of the present invention, the obtaining unit is specifically configured to: acquiring load information of a second cell in a current period, and determining a load average value of a first cell and the second cell in the current period; acquiring a network load balancing target value; and determining the energy-saving load threshold of the first cell according to the load average value of the current period and the network load balancing target value.

ρ_thr＝αρ_avg+(1-α)ρ_tar(1)

Optionally, as an embodiment of the present invention, the obtaining unit further includes: the first sending unit is used for reporting the load information of the first cell in the current period to the controller, and the load information of the first cell in the current period is used for the controller to determine the energy-saving load threshold of the first cell in the next period; and the receiving unit is used for receiving the energy-saving load threshold of the first cell in the next period, which is sent by the controller.

ρ_thr＝αρ_avg+(1-α)ρ_tar(1)

Optionally, as an embodiment of the present invention, the obtaining unit is specifically configured to: acquiring load information of a first cell in a previous period and load information of the first cell in a current period, and determining the current load variation of the first cell according to the load information of the first cell in the previous period and the load information of the first cell in the current period; acquiring a network load balancing target value; and determining the energy-saving load threshold of the first cell according to the load variation of the first cell and the load balancing target value.

ρ_thr,i＝ρ_tar-ρ_tarsign(Δρ_i)Δρ_tar(2)

Optionally, as an embodiment of the present invention, the control unit includes a second determination unit, and the second determination unit is configured to: determining the current load of a cell; when the current load of the first cell is smaller than the energy-saving load threshold, determining the reduction amplitude of the transmitting power of the first cell according to the current transmitting power of the first cell; the control unit is specifically configured to: and according to the reduction amplitude of the transmission power of the first cell, performing the reduction operation of the transmission power of the first cell.

Specifically, the wireless access point may measure a current load condition of the first cell according to an actual condition, and if the current load of the first cell is smaller than the energy-saving load threshold, the wireless access point may determine a reduction amplitude of the transmission power of the first cell according to the current transmission power of the first cell, specifically, may determine an amplitude of power adjustment according to formula (3), where formula (3) is as follows:

Optionally, as an embodiment of the present invention, the control unit is specifically configured to: and if the difference between the current transmitting power of the first cell and the reduction amplitude of the transmitting power of the first cell is larger than the power minimum threshold value, updating the transmitting power of the first cell to be the difference between the current transmitting power of the first cell and the reduction amplitude.

p_n+1,i＝Δp_n+1,i+p_n,i(4)

Optionally, as an embodiment of the present invention, the wireless access point further includes: a third determining unit, configured to determine an offset parameter of the first cell according to a reduction amplitude of the transmission power of the first cell; and the second sending unit is used for sending the offset parameter of the cell, so that the user equipment performs cell reselection operation according to the offset parameter.

Offset_n+1,i＝-Δp_n+1,i(5)

Specifically, the user equipment generally selects the cell with the greatest receiving channel strength when selecting, reselecting or camping on the cell. When the control channel power of the serving cell is adjusted, the user equipment in the cell will perform the following adjustment according to the received cell offset parameter, as shown in equation (6):

the RSRP is a Reference Signal Receiving Power (RSRP), that is, the ue selects a cell with the largest sum of the RSRP and the cell offset parameter as a serving cell.

It should be understood that the wireless access point 400 according to the embodiment of the present invention may correspond to the method 100 for performing power adjustment in wireless communication in the embodiment of the present invention, and the above and other operations and/or functions of each unit in the wireless access point 400 are respectively for implementing corresponding flows of each method in fig. 1 to fig. 3, and are not described herein again for brevity.

As shown in fig. 5, an embodiment of the present invention further provides a wireless access point 500, where the apparatus 500 includes a processor 510, a memory 520, and a bus system 530. The processor 510, the memory 520, and the bus system 530 are connected, wherein the memory 520 is used for storing instructions, and the processor 510 is used for executing the instructions stored in the memory 520. Wherein processor 510 is configured to: determining an energy-saving load threshold of a first cell controlled by a wireless access point; and controlling the transmission power of the first cell according to the determined energy-saving load threshold, wherein the transmission power of the first cell comprises the transmission power of the data channel.

It should be understood that, in the embodiment of the present invention, the processor 510 may be a Central Processing Unit (CPU), and the processor 510 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 520 may include both read-only memory and random access memory, and provides instructions and data to the processor 510. A portion of memory 520 may also include non-volatile random access memory. For example, the memory 520 may also store device type information.

The bus system 530 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as bus system 530.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 510. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 520, and the processor 510 reads the information in the memory 520 and performs the steps of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.

Alternatively, as an embodiment of the present invention, processor 510 may call program code stored in memory 520 to perform the following operations: acquiring load information of a first cell in a current period; and acquiring the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period.

Alternatively, as an embodiment of the present invention, processor 510 may call program code stored in memory 520 to perform the following operations: acquiring load information of a second cell in a current period, and determining a load average value of a first cell and the second cell in the current period; acquiring a network load balancing target value; and determining the energy-saving load threshold of the first cell according to the load average value of the current period and the network load balancing target value.

Optionally, as an embodiment of the present invention, the apparatus 500 further includes: a transmitter 540, where the transmitter 540 is configured to report load information of the first cell in a current period to the controller, where the load information is used for the controller to determine, according to the load information of the first cell in the current period, an energy saving load threshold of the first cell in a next period; a receiver 550, where the receiver 550 is configured to receive the energy saving load threshold of the first cell in the next period sent by the controller.

Alternatively, as an embodiment of the present invention, processor 510 may call program code stored in memory 520 to perform the following operations: acquiring load information of a first cell in a previous period and load information of the first cell in a current period, and determining the current load variation of the first cell according to the load information of the first cell in the previous period and the load information of the first cell in the current period; acquiring a network load balancing target value; and determining the energy-saving load threshold of the first cell according to the load variation of the first cell and the load balancing target value.

Alternatively, as an embodiment of the present invention, processor 510 may call program code stored in memory 520 to perform the following operations: determining a current load of a first cell; when the current load cell of the first cell is smaller than the energy-saving load threshold, determining the reduction amplitude of the transmitting power of the first cell according to the current transmitting power of the first cell; and according to the reduction amplitude of the transmission power of the first cell, performing the reduction operation of the transmission power of the first cell.

Alternatively, as an embodiment of the present invention, processor 510 may call program code stored in memory 520 to perform the following operations: and if the difference between the current transmitting power of the first cell and the reduction amplitude of the transmitting power of the first cell is larger than the power minimum threshold value, updating the transmitting power of the first cell to be the difference between the current transmitting power of the first cell and the reduction amplitude.

Optionally, as an embodiment of the present invention, the transmission power of the first cell includes a transmission power of a control channel.

Alternatively, as an embodiment of the present invention, processor 510 may invoke the program code stored in memory 520 to determine an offset parameter for the first cell based on the magnitude of the reduction in the transmit power of the first cell; the transmitter 540 is configured to send the offset parameter of the first cell for the user equipment to perform a cell reselection operation according to the offset parameter.

It should be understood that the wireless access point 500 according to the embodiment of the present invention may correspond to the wireless access point 200 in the embodiment of the present invention, and may correspond to a corresponding main body in executing the method 100 according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the wireless access point 500 are respectively for implementing corresponding flows of each method in fig. 1 to fig. 4, and are not described again here for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. 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.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, 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 or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. 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 functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) 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: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for adjusting power in wireless communications, comprising:

a wireless access point determines an energy-saving load threshold of a first cell controlled by the wireless access point;

the wireless access point controls the transmitting power of the first cell according to the energy-saving load threshold, wherein the transmitting power of the first cell comprises the transmitting power of a data channel;

wherein the determining, by the wireless access point, an energy saving load threshold of a first cell controlled by the wireless access point comprises:

the wireless access point acquires the load information of the first cell in the current period;

the wireless access point determines an energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period;

wherein the determining, by the wireless access point, the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period includes:

the wireless access point acquires load information of a second cell in the current period and determines a load average value of the first cell and the second cell in the current period;

the wireless access point acquires a network load balancing target value;

and the wireless access point determines the energy-saving load threshold of the first cell according to the load average value of the current period and the network load balancing target value.

2. A method for adjusting power in wireless communications, comprising:

wherein, the determining, by the wireless access point, the energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period includes:

the wireless access point determines the current load variation of the first cell according to the load information of the first cell in the last period and the load information of the first cell in the current period;

the wireless access point acquires a network load balancing target value;

and the wireless access point determines an energy-saving load threshold of the first cell according to the load variation of the first cell and the load balancing target value.

3. The method of claim 1 or 2, wherein the controlling, by the wireless access point, the transmit power of the first cell based on the energy saving load threshold comprises:

determining, by the wireless access point, a current load of the first cell;

if the current load of the first cell is smaller than the energy-saving load threshold, the wireless access point determines the reduction amplitude of the transmission power of the first cell according to the current transmission power of the first cell;

and the wireless access point executes the reduction operation of the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell.

4. The method of claim 3, wherein the wireless access point performing the operation of reducing the transmission power of the first cell according to the reduction of the transmission power of the first cell comprises:

and if the difference between the current transmitting power of the first cell and the reduction amplitude of the transmitting power of the first cell is larger than a power minimum threshold value, updating the transmitting power of the first cell to be the difference between the current transmitting power of the first cell and the reduction amplitude.

5. The method of claim 1 or 2, wherein the transmit power of the first cell comprises a transmit power of a control channel.

6. The method of claim 5, further comprising:

determining, by the wireless access point, a magnitude of reduction in transmit power of the first cell as an offset parameter for the first cell;

and sending the offset parameter of the cell to user equipment, so that the user equipment performs cell reselection operation according to the offset parameter.

7. A wireless access point, comprising:

a first determining unit, configured to determine an energy saving load threshold of a first cell controlled by the radio access point;

a control unit, configured to control the transmit power of the first cell according to the energy saving load threshold determined by the determining unit, where the transmit power of the first cell includes the transmit power of a data channel;

wherein the wireless access point further comprises an obtaining unit, the obtaining unit is configured to:

acquiring load information of the first cell in a current period;

determining an energy-saving load threshold of the first cell in the next period according to the load information of the first cell in the current period;

wherein the obtaining unit is specifically configured to:

acquiring load information of a second cell in the current period, and determining a load average value of the first cell and the second cell in the current period;

acquiring a network load balancing target value;

and determining the energy-saving load threshold of the first cell according to the load average value of the current period and the network load balancing target value.

8. A wireless access point, comprising:

acquiring load information of the first cell in a current period;

wherein the obtaining unit is specifically configured to:

acquiring load information of the first cell in a last period and load information of the first cell in a current period, and determining a current load variation of the first cell according to the load information of the first cell in the last period and the load information of the first cell in the current period;

acquiring a network load balancing target value;

and determining the energy-saving load threshold of the first cell according to the load variation of the first cell and the load balancing target value.

9. The wireless access point according to claim 7 or 8, wherein the control unit comprises a second determining unit configured to: determining a current load of the first cell; the second determining unit is configured to determine, when the current load of the first cell is lower than the energy-saving load threshold, a reduction range of the transmission power of the first cell according to the current transmission power of the first cell;

the control unit is specifically configured to: and executing the reduction operation of the transmission power of the first cell according to the reduction amplitude of the transmission power of the first cell.

10. The wireless access point of claim 9, wherein the control unit is specifically configured to:

11. A wireless access point according to claim 7 or 8, wherein the transmit power of the first cell comprises the transmit power of a control channel.

12. The wireless access point of claim 11, wherein the wireless access point further comprises:

a third determining unit, configured to determine a magnitude of reduction of the transmission power of the first cell as an offset parameter of the first cell;

and the second sending unit is used for sending the offset parameter of the cell so as to be used for the user equipment to perform cell reselection operation according to the offset parameter.