JP6526962B2 - Power control method, base station and central controller - Google Patents

Description

  The present invention relates to the field of mobile communication technology, and more particularly, to a power control method and an apparatus which is a base station or a centralized controller.

  Cellular mobile phones are extremely useful for people's communication. The 3rd Generation Partnership Project (3GPP), as a key organization in the field of mobile communications, will greatly accelerate the progress of standardization of the 3rd generation mobile communications technology (3G: The Third Generation). In order to address the challenges of broadband access technology and to meet the growing demand for new services, 3GPP has been working on the standardization of Long Term Evolution (LTE) technology from 3G from the end of 2004. By having it started, the spectrum efficiency is further improved, the performance of the cell edge user is improved, the system delay is reduced, and the higher speed access service is provided to the high speed mobile user. The improved LTE (LTE-A: LTE-Advanced) technology is also based on LTE technology to increase the spectrum bandwidth several times and double the data rate, further to more mobile users Provide services that are faster and have better performance.

  For example, in addition to the macro cell (Macro Cell) in the traffic congestion area, the provision of Release 12 (Rel-12) of 3GPP in order to improve the network capacity of the traffic congestion area such as a gymnasium and a shopping center etc. Small cells can be deployed, and these small cells can bear most of the data traffic. By placing small cells in a high traffic area, network capacity can be greatly improved, but at the same time, as the density of small cells increases, interference between small cells also significantly increases, which in turn, increases network capacity. Improvement is limited.

  In order to solve the above problems, in an embodiment of the present invention, a power control method capable of reducing inter-cell interference to improve network capacity, and a base station or centralized controller executing this method Are provided.

  The power control method provided in the embodiment of the present invention determines the sum of gains due to the reduction of the transmission power of the base station of the first cell of the users in all the second cells adjacent to the first cell, Determine the sum of the price that all users in the first cell will pay for the reduction of the transmission power of the base station of the first cell, and the base station of the first cell of the users in all the second cells Of the first cell based on the sum of the gain due to the reduction of the transmission power and the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell. Determining the transmission power of the base station.

  Here, to determine the sum of gains due to the reduction of the transmission power of the base station of the first cell of the users in all the second cells adjacent to the first cell is received by the user in the second cell. Determine the relationship between the difference between the signal quality parameter of the second cell and the first cell and the gain due to the reduction of the transmission power of the base station of the first cell, and each user in all the second cells Determine the difference between the signal quality parameters of the second cell and the first cell received in step c., And the signal quality parameters of the second cell and the first cell received by the user in the second cell By reducing the transmission power of the base station of the first cell of each user in all the second cells, based on the relationship between the difference between the two and the gain due to the reduction of the transmission power of the base station of the first cell. Each of the users in all of the second cells Of the transmission powers of the base station of the first cell to reduce the sum of the gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell , Including.

  Here, the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the gain due to the reduction of the transmission power of the base station of the first cell is The smaller the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell, the larger the gain due to the reduction of the transmission power of the base station of the first cell. Including.

  Here, the base station of the second cell may determine the difference between the signal quality parameter of the second cell and the first cell received by each user in all the second cells. The signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell are received and fed back to the base station of the first cell, and the first cell of the first cell is received. A base station receives signal quality parameters of the second cell and signal quality parameters of the first cell received by each user in the second cell, which are fed back from base stations of all the second cells. And for each user in all of the second cells, the base station of the first cell is the signal quality of the second cell and the first cell received by each user in all of the second cells. Calculate each parameter difference , Including that.

  Alternatively, it is preferable that the base station of the second cell determines the difference in signal quality parameter between the second cell and the first cell received by each user in all the second cells. Receiving the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in two cells, and for each user in the second cell, the base station of the second cell Respectively calculate the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell and feed back to the base station of the first cell, the base stations of the first cell all Receiving the difference between the signal quality parameter of the second cell received by each user in the second cell and the signal quality parameter of the first cell, which is fed back from the base station of the second cell; Including.

  Alternatively, the base station of the second cell may determine the difference between the signal quality parameter of the second cell and the first cell received by each user in all the second cells. Receiving signal quality parameters of the first cell and signal quality parameters of the second cell reported from each user in the second cell, and for each user in the second cell, the base of the second cell And calculating a difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, respectively. In this case, in each of the users in all the second cells, the base station of the second cell determines the gain due to the reduction of the transmission power of the base station of the first cell. Based on the relationship between the difference between the reference signal reception power of the second cell and the first cell received by each user in two cells and the gain due to the reduction of the transmission power of the base station of the first cell, Determining a gain by reducing the transmission power of the base station of the first cell for each user in the second cell. The sum of the gains by reduction of the transmission power of the base station of the first cell of the respective users in all of the second cells may be obtained by combining the base stations of the second cell with the respective users in the second cell. The sum of the gain of each user in the second cell due to the reduction of the transmission power of the base station of the first cell by summing the gains of the reduction of the transmission power of the base station of the first cell, The feedback is made to the base station of the first cell, and the base station of the first cell further sums the sum of the gains fed back from the base stations of all the second cells, and the users in all the second cells Obtaining a sum of gains due to the reduction of the transmission power of the base station of the first cell.

  Alternatively, the base station of the second cell may determine the difference between the signal quality parameter of the second cell and the first cell received by each user in all the second cells. The signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell are received and fed back to the centralized controller, the centralized controller is for all the said Receiving a signal quality parameter of the second cell and a signal quality parameter of the first cell received by each user in the second cell, fed back from a base station of the second cell; The central controller calculates, for each user in a cell, respectively, the difference in signal quality parameters between the second cell and the first cell received by each user in all the second cells; Including .

  Alternatively, the base station of the second cell may determine the difference between the signal quality parameter of the second cell and the first cell received by each user in all the second cells. Receiving signal quality parameters of the first cell and signal quality parameters of the second cell reported from each user in the second cell, and for each user in the second cell, the base of the second cell The station calculates the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell respectively and feeds it back to the centralized controller, the centralized controller being the base of all the second cells Receiving the difference between the signal quality parameter of the second cell received by each user in the second cell and the signal quality parameter of the first cell, fed back from a station.

  Alternatively, the base station of the second cell may determine the difference between the signal quality parameter of the second cell and the first cell received by each user in all the second cells. Receiving signal quality parameters of the first cell and signal quality parameters of the second cell reported from each user in the second cell, and for each user in the second cell, the base of the second cell And calculating a difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, respectively. In this case, in each of the users in all the second cells, the base station of the second cell determines the gain due to the reduction of the transmission power of the base station of the first cell. Based on the relationship between the difference between the reference signal reception power of the second cell and the first cell received by each user in two cells and the gain due to the reduction of the transmission power of the base station of the first cell, Determining a gain by reducing the transmission power of the base station of the first cell for each user in the second cell. The sum of the gains by reduction of the transmission power of the base station of the first cell of the respective users in all of the second cells may be obtained by combining the base stations of the second cell with the respective users in the second cell. The sum of the gain of each user in the second cell due to the reduction of the transmission power of the base station of the first cell is concentrated by summing the gains of the reduction of the transmission power of the base station of the first cell. The feedback to the controller, the centralized controller further sums the sum of the gains fed back from the base stations of all the second cells, and the first cell of the users in all the second cells. Obtaining the sum of gains due to the reduction of the transmission power of the base station.

  Here, it is possible to determine the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell, the signal-to-interference-noise ratio of the users in the first cell. The relationship between (SINR) and the price paid by the user for reduction of the transmission power of the base station of the first cell is determined, and SINR of each user in the first cell is determined, respectively; Each user in the first cell is the base of the first cell based on the relationship between the SINR of the user in the cell and the price paid by the user for the reduction of the transmission power of the base station of the first cell. The price to be paid for the reduction of the transmission power of each station is determined, and the price for each user in the first cell to pay for the reduction of the transmission power of the base station of the first cell is totaled. All users in the cell are at the base station of the first cell Obtaining a sum of the price to pay in order to reduce the transmission power, including that.

  The relationship between the signal to interference and noise ratio (SINR) of the user in the first cell and the price paid by the user for the reduction of the transmission power of the base station of the first cell is the user in the first cell The smaller the SINR, the greater the price paid by the user for the reduction of the transmission power of the base station of the first cell.

によって、前記第１セルの基地局の送信電力を決定する、ことを含み、ここで、Ｐは、前記第１セルの基地局の最大送信電力であり、Ｐ_ＴＸは、前記第１セルの基地局の調整後の送信電力であり、ΣＰａｉｎは、前記第１セル内の全てのユーザが前記第１セルの基地局の送信電力の低減のために支払う代価の和であり、ΣＧａｉｎは、全ての前記第２セル内のユーザの、前記第１セルの基地局の送信電力の低減による利得の和である。 Here, determining the transmission power of the base station of the first cell is

To determine the transmission power of the base station of the first cell, where P is the maximum transmission power of the base station of the first cell, and P _TX is the base of the first cell The adjusted transmission power of the station, ΣPain is the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell, and GaGain is all It is the sum of the gain by reduction of the transmission power of the base station of the said 1st cell of the user in the said 2nd cell.

によって、前記第１セルの基地局の送信電力を決定する、ことを含み、ここで、Ｐは、前記第１セルの基地局の最大送信電力であり、Ｐ_Ｔｘは、前記第１セルの基地局の調整後の送信電力であり、ΣＰａｉｎは、前記第１セル内の全てのユーザが前記第１セルの基地局の送信電力の低減のために支払う代価の和であり、ΣＧａｉｎは、全ての前記第２セル内のユーザの、前記第１セルの基地局の送信電力の低減による利得の和であり、αは、負荷因子であり、前記第２セルに干渉を与えることが可能なセルの数と関係がある。ここで、前記第２セルに干渉を与えることが可能なセルの数が少ないほど、αが大きくなる。 Alternatively, determining the transmission power of the base station of the first cell is

To determine the transmission power of the base station of the first cell, where P is the maximum transmission power of the base station of the first cell, and P _Tx is the base of the first cell The adjusted transmission power of the station, ΣPain is the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell, and GaGain is all The sum of the gain of the user in the second cell due to the reduction of the transmission power of the base station of the first cell, and α is a load factor, of the cell capable of giving interference to the second cell It is related to the number. Here, α is larger as the number of cells capable of giving interference to the second cell is smaller.

  A base station according to an embodiment of the present invention is a gain determining means for determining a sum of gains of users in all second cells adjacent to a first cell due to reduction of transmission power of the base station of the first cell Price determining means for determining the sum of the price paid by all users in the first cell for reduction of the transmission power of the base station of the first cell, and the users in all the second cells, Based on the sum of the gain due to the reduction of the transmission power of the base station of the first cell and the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell And power determination means for determining the transmission power of the base station of the first cell.

  Here, the gain determination means is configured to determine all the signal quality parameters of the first cell and the signal quality parameters of the second cell reported from each user in the second cell to the base station of the second cell. The difference between the signal quality parameter of the first cell and the signal quality parameter of the second cell for each first user receiving from the base station of the second cell and for each user in all the second cells Calculation module for respectively calculating the difference between the signal quality parameter of the first cell and the signal quality parameter of the second cell, and of the transmission power of the base station of the first cell of the user in the second cell The relationship between the reduction gain and the gain is stored, and the difference between the signal quality parameter of the first cell and the signal quality parameter of the second cell and the transmission of the base station of the first cell by the user in the second cell Power A mapping module for obtaining gain by reducing the transmission power of the base station of the first cell for each user in all the second cells based on the relation with gain by reduction, and a mapping module in all the second cells Gain of each user of the first cell by reduction of the transmission power of the base station of the first cell, and gain of the reduction of the transmission power of the base station of the first cell of the users in all the second cells And a first sum module for obtaining a sum.

  Alternatively, the gain determining means may calculate all differences between the signal quality parameter of the second cell and the signal quality parameter of the first cell reported from each user in the second cell to the base station of the second cell. A second receiving module respectively receiving from a base station of the second cell, a difference between a signal quality parameter of the second cell and a signal quality parameter of the first cell, and a user of the second cell, The relationship between the signal quality parameter of the second cell and the signal quality parameter of the first cell is stored, and the relationship between the signal quality parameter of the second cell and the signal quality parameter of the first cell is stored. Based on the relationship with the gain due to the reduction of the transmission power of the base station of the first cell, the gain due to the reduction of the transmission power of the base station of the first cell of each user in all the second cells is Get mapping Joule and the gain by reducing the transmission power of the base station of the first cell, of each user in all the second cells, and adding the gain of the first cell of the users in all the second cells. And a first summing module for obtaining a sum of gains due to the reduction of the transmission power of the base station.

  Alternatively, the gain determining means may receive, from each of the base stations of all the second cells, the sum of the gain of each user in the second cell due to the reduction of the transmission power of the base station of the first cell. The sum of gains due to reductions in transmission power of the base station of the first cell of three reception modules and each user in each of the second cells is further summed up to obtain the user of all the second cells. And a second summing module for obtaining a sum of gains due to the reduction of the transmission power of the base station of the first cell.

  Here, the price determination means comprises: an SINR receiving module for receiving a signal to interference and noise ratio (SINR) of each user reported from a user in the first cell; a SINR of the user in the first cell; The relationship between the user and the price paid for the reduction of the transmission power of the base station of the first cell is stored, and the SINR of the user in the first cell and the transmission power of the base station of the first cell A second mapping module for determining the price paid by each user in the first cell for reduction of the transmission power of the base station of the first cell based on the relationship with the price paid for reduction of All users in the first cell are transmitted by the base station of the first cell, adding up the price that each user in the first cell pays for the reduction of the transmission power of the base station of the first cell. Support for reducing power consumption Including the price the total module to obtain the sum of cormorants price, the.

  A base station according to another embodiment of the present invention receives a signal quality parameter of the first cell reported by a user in the first cell and a signal quality parameter of each second cell adjacent to the first cell. Receiving means, the signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of the corresponding second cell to the base station or centralized controller of each of the second cells And first reporting means for feedback.

  A base station according to another embodiment of the present invention receives a signal quality parameter of the first cell reported by a user in the first cell and a signal quality parameter of each second cell adjacent to the first cell. Calculating means for calculating the difference between the signal quality parameter of the first cell reported from the user and the signal quality parameter of the second cell for each user in the first cell And the difference between the signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of the corresponding second cell to the base station or centralized controller of each of the second cells. And second reporting means for feedback.

  A base station according to another embodiment of the present invention receives a signal quality parameter of the first cell reported by a user in the first cell and a signal quality parameter of each second cell adjacent to the first cell. Calculating means for calculating the difference between the signal quality parameter of the first cell reported from the user and the signal quality parameter of the second cell for each user in the first cell , The difference between the signal quality parameter of the first cell and the signal quality parameter of each second cell, and the gain that the reduction of the transmission power of the base station of the second cell brings to the user in the first cell For each user in the first cell based on the difference between the signal quality parameter of the first cell received by the user and the signal quality parameter of each of the second cells. Transmission of cell base station Mapping means for respectively determining the gain that the reduction of power brings to the user, and the sum of the gains that the reduction of the transmission power of the base station of the second cell brings to the users in the first cell for each of the second cells Are fed back to the corresponding second cell base station or central controller of the corresponding second cell, and the sum of the gain that the reduction of the transmission power of the second cell base station brings to the user in the first cell And third reporting means.

  Another embodiment of the present invention also discloses a power control method. This method determines the sum of the price that the users in all the second cells adjacent to the first cell pay for the increase of the transmission power of the base station of the first cell, and for all the users in the first cell Determine the sum of gains due to the increase of the transmission power of the base station of the first cell, and the sum of the price paid by the users in all the second cells for the increase of the transmission power of the base station of the first cell, Determining the transmission power of the base station of the first cell based on the sum of the gains by the increase of the transmission power of the base station of the first cell of all the users in one cell.

  Here, to determine the sum of the price that users in all the second cells adjacent to the first cell pay for the increase of the transmission power of the base station of the first cell is received by the user in the second cell Determine the relationship between the difference between the signal quality parameters of the second cell and the first cell, and the price to be paid for the increase of the transmission power of the base station of the first cell, and each user in all the second cells To determine the difference between the signal quality parameters of the second cell and the first cell received by the user, and the difference between the signal quality parameters of the second cell and the first cell received by the user in the second cell, and Each user in all the second cells pays for the increase of the transmission power of the base station of the first cell based on the relation with the price to pay for the increase of transmission power of the base station of one cell. Each of the users in all the second cells is transmitted by the base station of the first cell. By summing the price to pay for the increase, the users in all the second cell to obtain a sum of price to pay for increased transmission power of the base station of the first cell includes.

  Here, determining the sum of gains due to the increase in transmission power of the base station of the first cell of all the users in the first cell means the signal to interference and noise ratio (SINR) of the users in the first cell. Determine the relationship between the user in the first cell and the gain due to the increase of the transmission power of the base station in the first cell, determine the SINR of each user in the first cell, and The transmission power of the first cell base station of each user in the first cell based on the relationship between the SINR and the gain of the user in the first cell due to the increase in transmission power of the base station in the first cell. The gains due to the increase are respectively determined, and the gains due to the increase of the transmission power of the base station of the first cell for each user in the first cell are summed up, and the base of the first cell for all the users in the first cell Obtaining the sum of gains due to the increase in transmission power of the station.

によって、第１セルの基地局の送信電力を決定し、ここで、Ｐ_originalは、第１セルの基地局の初期送信電力であり、Ｐ_Ｔｘは、第１セルの基地局の調整後の送信電力であり、ΣＰａｉｎ_１は、全ての第２セル内のユーザが第１セルの基地局の送信電力の増加のために支払う代価の和であり、ΣＧａｉｎ_１は、第１セル内の全てのユーザの、第１セルの基地局の送信電力の増加による利得の和である。 Where the formula

Determines the transmission power of the base station of the first cell, where P _original is the initial transmission power of the base station of the first cell, and P _Tx is the adjusted transmission of the base station of the first cell The power, ΣPain ₁ is the sum of the costs that the users in all the second cells pay for the increase of the transmission power of the base station of the first cell, and GaGain ₁ is all the users in the first cell , The sum of gains due to the increase of the transmission power of the base station of the first cell.

によって、第１セルの基地局の送信電力を決定し、ここで、Ｐ_originalは、第１セルの基地局の初期送信電力であり、Ｐ_Ｔｘは、第１セルの基地局の調整後の送信電力であり、ΣＰａｉｎ_１は、全ての第２セル内のユーザが第１セルの基地局の送信電力の増加のために支払う代価の和であり、ΣＧａｉｎ_１は、第１セル内の全てのユーザの、第１セルの基地局の送信電力の増加による利得の和であり、αは、負荷因子である。 Or the formula

Determines the transmission power of the base station of the first cell, where P _original is the initial transmission power of the base station of the first cell, and P _Tx is the adjusted transmission of the base station of the first cell The power, ΣPain ₁ is the sum of the costs that the users in all the second cells pay for the increase of the transmission power of the base station of the first cell, and GaGain ₁ is all the users in the first cell Is the sum of gains due to the increase in transmission power of the base station in the first cell, and α is a loading factor.

  Another embodiment of the present invention also discloses a base station. The base station determines second sum price determination means for determining the sum of the price paid by the users in all the second cells adjacent to the first cell for the increase of the transmission power of the base station of the first cell; A second gain determining means for determining the sum of gains due to increases in transmission power of the base station of the first cell among all users in the cell; and a user in all the second cells is a transmission of the base station of the first cell The transmission of the base station of the first cell based on the sum of the price paid for the increase of power and the sum of the gains by the increase of the transmission power of the base station of the first cell for all the users in the first cell And second power determining means for determining power.

  Here, the second gain determining means comprises: a SINR receiving module for receiving a signal to interference and noise ratio (SINR) of each user reported from a user in the first cell; a SINR of the user in the first cell; The relationship between the user's gain due to the increase in transmission power of the base station in the first cell is stored, and the SINR of the user in the first cell and the gain due to the increase in transmission power of the base station in the first cell And a fourth mapping module for determining gains by the increase in transmission power of the base station in the first cell of each user in the first cell based on the relationship with And a gain summing module that sums the gains due to the increase of the transmission power of the cell base station to obtain the sum of the gains due to the increase of the transmission power of the base station of the first cell for all users in the first cell. .

  A base station according to another embodiment of the present invention receives a signal quality parameter of a first cell reported by a user in a first cell and a signal quality parameter of each second cell adjacent to the first cell. Means, difference calculation means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported by the user and the signal quality parameter of each second cell, and the first cell Storing the relationship between the difference between the signal quality parameter of the second cell and the signal quality parameter of each second cell and the price paid by the user in the first cell for the increase of the transmission power of the base station of the second cell; For the users in the cell, each user in the first cell is associated with each second cell based on the difference between the signal quality parameter of the first cell received by the user and the signal quality parameter of each second cell. Of the base station's transmit power increase For each of the second cells, and the sum of the price paid by the user in the first cell for the increase of the transmission power of the base station of the second cell. The second summing means for calculating and the sum of the price that the user in the first cell pays for the increase of the transmission power of the base station of the second cell to the corresponding second cell base station respectively And reporting means.

  The embodiments of the present invention also provide a centralized controller. The central controller comprises: gain determining means for determining a sum of gains due to reduction of transmission power of a base station of the first cell of users in all second cells adjacent to the first cell; Price determination means for determining the sum of the price paid for the reduction of the transmission power of the base station of the first cell by all the users in the first cell; the base of the first cell of the users in all the second cells The first cell, based on the sum of the gain due to the reduction of the transmission power of the station and the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell. Power determination means for determining the transmission power of the base station, and notification means for notifying the base station of the first cell of the determined transmission power of the base station of the first cell.

  A central controller according to another embodiment of the present invention determines the sum of the price that users in all the second cells adjacent to the first cell pay for the increase of the transmission power of the base station of the first cell. A second cost determining means, a second gain determining means for determining the sum of gains due to the increase of the transmission power of the base station of the first cell of all the users in the first cell, and the users in all the second cells Based on the sum of the price paid for the increase of the transmission power of the base station of the first cell, and the sum of the gains of all the users in the first cell due to the increase of the transmission power of the base station of the first cell, A second power determination means for determining the transmission power of the base station of the first cell, and a notification means for notifying the base station of the first cell of the determined transmission power of the base station of the first cell.

  As can be understood from the above power control method and the internal configuration of the base station or the centralized controller, when performing power control, the base station of the cell reduces the transmission power of the base station of the first cell within the second cell. In addition to taking into account the throughput gain that can be provided to users in the first cell, the throughput cost paid by the users in the first cell for reduction of the transmission power of the base station in the first cell is also taken into account simultaneously, or The throughput paid by the users in the second cell for the increase in the transmission power of the base station in the first cell, as well as taking into account the throughput gain that the increase in transmission power of the base station can bring to the users in the first cell The cost is also taken into consideration simultaneously, and the gain and cost due to the reduction or increase of the transmission power are taken into consideration to determine the preferable transmission power value and improve the capacity of the entire system.

FIG. 1 shows a conventional network configuration with a small cell arrangement. FIG. 7 is a diagram illustrating another conventional network configuration having a small cell arrangement. 5 is a flowchart of a power control method according to an embodiment of the present invention. It is a flowchart of the method of determining the sum of the gain by reduction of the transmission power of the base station of a 1st cell of the user in all the 2nd cells adjacent to a 1st cell. FIG. 7 is a flow chart of a method of determining the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell. It is a figure which shows the internal structure of the base station which concerns on one Example of this invention. It is a figure which shows the internal structure of the base station which concerns on the other Example of this invention. It is a figure which shows the internal structure of the base station which concerns on the other Example of this invention. It is a figure which shows the internal structure of the base station which concerns on the other Example of this invention. 7 is a flowchart of a power control method according to another embodiment of the present invention. It is a flowchart of the method of determining the sum of the price which users in all the 2nd cells adjacent to the 1st cell pay for increase of the transmission power of the base station of the 1st cell. FIG. 7 is a flow chart of a method of determining the sum of gains due to the increase of the transmission power of the base station of the first cell of all the users in the first cell. It is a figure which shows the internal structure of the base station which concerns on the other Example of this invention.

  FIG. 1 is a diagram showing a conventional network configuration having a small cell arrangement. As shown in FIG. 1, a plurality of small cells, Small cell 1, Small cell 2, and Small cell 3, are simultaneously disposed within the coverage of one macro cell Macro cell, and Macro cell and Small cell Use different frequencies. FIG. 2 is a diagram showing another conventional network configuration having a small cell arrangement. In the network configuration shown in FIG. 2, although the macro cell Macro cell is not arranged, only a plurality of small cells, which are Small cell 1, Small cell 2 and Small cell 3, are arranged. As mentioned above, placing small cells in a high traffic area can significantly improve network capacity, but at the same time, as the density of small cells increases, interference between small cells also increases significantly. On the contrary, the improvement of network capacity is limited.

  Also, as can be understood by those skilled in the art, the magnitude of the transmission power of a base station in a cell directly affects the magnitude of interference to users in neighboring cells by the base station. For example, when the transmission power of the base station in a cell is high, the base station causes large interference to users in adjacent cells (particularly, end users of adjacent cells close to the base station). Conversely, when the transmission power of the base station of a cell is reduced, the interference to users in neighboring cells by the base station is also reduced. Moreover, such disciplines are also applicable in a small cell environment. Therefore, the present invention improves the system capacity in a case where the arrangement of the small cells is concentrated and the interference between the small cells is increased by devising to find a power control method applicable to the environment of the small cells. Plan to

  The following research results can be found by research. As mentioned above, when the transmission power of the base station of a cell is reduced, the interference to users in the neighboring cells by the base station is reduced, thereby improving the throughput of the users in the neighboring cell. The increase of the throughput of the user in such a neighboring cell corresponds to the gain of the user in the neighboring cell due to the reduction of the transmission power of the base station of the present cell. However, at the same time, since the transmission power of the base station of this cell is reduced, the throughput of the users in this cell is reduced. The reduction of the user's throughput in the cell due to the reduction of the transmission power of the base station of the present cell is at the expense of the user in the cell paying for the reduction of the transmission power of the base station of the cell. It is equivalent. Based on the above research results, embodiments of the present invention provide a power control method applicable to the small cell environment. Hereinafter, for convenience of description, the present cell will be referred to as a first cell, and all cells adjacent to the first cell will be referred to as second cells. The specific flow of the method mainly includes the following steps, as shown in FIG.

  In step 301, the sum of the gains of the users in all the second cells adjacent to the first cell due to the reduction of the transmission power of the base station of the first cell is determined. In step 302, the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell is determined. In step 303, the sum of the gain due to the reduction of the transmission power of the base station of the first cell of the users in all the second cells and the transmission power of the transmission power of the base stations of all the first cells in the first cell. The transmission power of the base station of the first cell is determined based on the sum of the price paid for reduction.

であると仮定する。ここで、λは、電力調整係数であって、かつ、λ＞１である。 Next, a method of determining the sum of gains by reduction of the transmission power of the base station of the first cell of the users in all the second cells adjacent to the first cell in step 301 will be described in detail. The maximum transmission power of the base station of the cell (eg, small cell Small cell 1) is P, and the low adjusted transmission power is

Suppose that Here, λ is a power adjustment coefficient, and λ> 1.

  Under the above assumption conditions, before and after adjusting the transmission power of the base station of Small cell 1, the signal to interference and noise ratio of user UE1 in the second cell of Small cell 1 (for example, Small cell Small cell 2) is respectively It is as showing to following Numerical formula 1 and Numerical formula 2.

Here, SINR _f1 is the signal-to-interference-and-noise ratio of user UE1 in small cell 2 before adjustment of the transmission power of the small cell 1 base station, and SINR _r1 is the transmission power of the small cell 1 base station after adjustment of a signal to interference noise ratio of the UE1, _{S 2} is the signal intensity of Small cell 2 received in UE1, _{I 1,} before adjustment of the transmission power of the base station of Small cell 1 The interference from Small cell 1 received at UE 1, I _out is the interference from other adjacent small cells received at UE 1, and N is system noise.

Dividing SINR _r1 by SINR _f1 gives a reference value of the signal to interference and noise ratio gain. Specifically, it is as shown in Equation 3 below.

According to Shannon's theory, the larger the ΔSINR ₁ , the greater the increase in throughput of UE 1, ie, the greater the gain due to power reduction.

Also, as can be found by studying Equation 3 above, if λ, I _out , and N are fixed and do not change, the larger I ₁ is, the larger ΔSINR ₁ is. This is because the power adjustment factor does not change and the network environment does not basically change, and the user in Small cell 2 gets closer to Small cell 1 by reducing the base station power of Small cell 1 Represents that the gain obtained is increased. That is, the difference between the signal quality parameter of Small cell 2 received by the user in Small cell 2 and the signal quality parameter of Small cell 1 received, and the transmission power of the user's base station of Small cell 1. There is an inverse relationship similar to the gain due to the reduction of. The signal quality parameters should include, but are not limited to, reference signal received power (RSRP), reference signal received quality (RSRQ), and received signal strength indication (RSSI). However, for convenience of explanation, in the embodiment of the present invention, RSRP is described as an example. That is, in the following embodiments, RSRP may be directly replaced with signal quality parameters such as RSRQ or RSSI.

  The difference between the reference signal received power (RSRP) of the second cell and the first cell received by the user in the second cell with the power adjustment coefficient determined by the above research results and simulation experiments, The relationship with the gain due to the reduction of the transmission power of the base station of the cell can be obtained. This relationship may be an approximate expression or a table as shown in Table 1 below. In Table 1 below, the above gain values can be further normalized to obtain normalized gain values.

  Based on the above study, as shown in FIG. 4, this step 301 may specifically include the following steps.

  In step 401, the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the gain due to the reduction of the transmission power of the base station of the first cell (for example, Determine Table 1). In step 402, the differences in signal quality parameters between the second cell and the first cell received by each user in all the second cells are respectively determined. In step 403, based on the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell, and the gain due to the reduction of the transmission power of the base station of the first cell, The gain by reducing the transmission power of the base station of the first cell is determined for each user in all the second cells. In step 404, the gain by reducing the transmission power of the base station of the first cell of each user in all the second cells is summed up, and the base station of the first cell of the users in all the second cells Obtain the sum of gains due to the reduction of the transmission power.

  In a specific application, the sum of gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell may be determined by the following three methods.

  Method 1: The base station of the second cell reports the signal quality parameter of the first cell (eg, reference signal received power RSRP1) reported from each user in the second cell and the signal quality parameter of the second cell (eg, reference) When the signal reception power RSRP2) is received, it is directly fed back to the base station of the first cell, and the base station of the first cell transmits the signal quality parameter of the second cell to the users in all the second cells. The difference with the signal quality parameter of the first cell is calculated respectively, and then the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell and the reduction of the transmission power of the base station of the first cell Based on the relationship with the gain brought to the users in the two cells, the gains in reduction of the transmission power of the base station of the first cell by the users in all the second cells are respectively obtained, and finally, by the sum, all Second Users in the cell, obtaining a gain sum by reducing transmission power of the base station of the first cell.

  Method 2: When the base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell, the signal quality parameter of the second cell and The difference with the signal quality parameter of the first cell is respectively calculated, and the difference is fed back to the base station of the first cell, and for the users in all the second cells, the base station of the first cell is The difference between the signal quality parameter of the cell and the signal quality parameter of the first cell (in actual applications, which of the four sections may be indicated by 2 bits), the transmission power of the base station of the first cell Based on the relationship with the gain that the reduction of the power brings to the users in the second cell, the gains by the reduction of the transmission power of the base station of the first cell are obtained respectively for the users in all the second cells, and finally the sum By all the second cells Of over THE obtain the gain sum by reducing transmission power of the base station of the first cell.

  Method 3: When the base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell, the signal quality parameter of the second cell and The difference with the signal quality parameter of the first cell is calculated respectively, and then the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell and the reduction of the transmission power of the base station of the first cell Based on the relationship with the gain brought to the users in the two cells, each user in the second cell obtains a gain due to the reduction of the transmission power of the base station of the first cell, and the sum gives all of the cells in the second cell. The sum of gains by reduction of the transmission power of the base station of the first cell among the users of the first cell is obtained and fed back to the base station of the first cell, and the base station of the first cell is from the base stations of all the second cells. The cell that was fed back Of all the users in the first cell by reduction of the transmission power of the base station in the first cell, and the sum of the gains in all the second cells, by the reduction of the transmission power of the base station in the first cell. Get the sum of

  It should be noted that any of the above three methods are suitable for application to distributed systems. On the other hand, when applied to a centralized system, since the system includes a centralized controller (for example, a Base Band Unit (BBU)), instead of the base station of the first cell in the above three methods, Using the above-mentioned central controller to realize the corresponding function, and the central controller calculates the sum of the gain of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell May be

  Specifically, corresponding to the method 1, the base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell. Then, it directly feeds back to the centralized controller, and for users in all the second cells, the centralized controller calculates the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, respectively. Then, based on the relationship between the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the gain that the reduction of the transmission power of the base station of the first cell brings to the user in the second cell. Gain gain by reducing the transmission power of the base station of the first cell of the users in all the second cells, and finally the base station of the first cell of the users in all the second cells by summation Gain due to reduced transmit power Get the sum.

  In response to the method 2, when the base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell, the second cell The difference between the signal quality parameter of the first cell and the signal quality parameter of the first cell is calculated, and the difference is fed back to the centralized controller, and for the users in all the second cells, the centralized controller All the second cells based on the relationship between the difference between the signal quality parameter of the first cell and the signal quality parameter of the first cell and the gain that the reduction of the transmission power of the base station of the first cell brings to the user in the second cell. Gain by reducing the transmission power of the base station of the first cell by each of the users, and finally by reducing the transmission power of the base station of the first cell by users in all the second cells Get the sum of the gains.

  In response to the method 3, when the base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell, the second cell The difference between the signal quality parameter of the first cell and the signal quality parameter of the first cell is calculated respectively, and then the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell and the transmission of the base station of the first cell Based on the relationship between the reduction in power and the gain that the reduction in power brings to the users in the second cell, each user in the second cell obtains a gain due to the reduction of the transmission power of the base station in the first cell, respectively, and The sum of gains by reduction of the transmission power of the base station of the first cell of all users in two cells is obtained and fed back to the centralized controller, which feeds back from the base stations of all the second cells. That was done The sum of the gains of all the users in the first cell due to the reduction of the transmission power of the base station of the first cell is further summed up to reduce the transmission power of the base station of the first cell among the users in all the second cells. Get the sum of the gains.

  Next, the method of determining the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell in step 302 will be described in detail.

であると仮定する。ここで、λは、電力調整係数であって、かつ、λ＞１である。 Similarly, the maximum transmission power of the base station of the cell (eg, small cell Small cell 1) is P, and the low adjusted transmission power is

Suppose that Here, λ is a power adjustment coefficient, and λ> 1.

  Under the above assumed conditions, before and after the adjustment of the transmission power of the small cell 1 base station, the signal to interference and noise ratio of the user UE 2 in the small cell 1 is as shown in Formula 4 and Formula 5 below, respectively.

Here, SINR _f2 is the signal-to-interference-noise ratio of user UE2 in Small cell 1 before adjustment of the transmission power of the Small cell 1 base station, and SINR _r2 is the transmission power of the Small cell 1 base station after adjustment of a signal to interference noise ratio of the user UE2 in Small cell _{1, S} 1 is the signal intensity of Small cell 1 received by the user UE2, I is the user of UE2 Small cell 1 It is interference from the received adjacent small cell, and N is system noise.

Dividing SINR _r2 by SINR _f2 gives a reference value of the signal to interference and noise ratio gain. Specifically, it is as shown in Equation 6 below.

As can be found by studying Equation 6 above, if λ is fixed and does not change, the smaller the SINR _f 2, the more expensive the UE 2 will pay for the power reduction of the small cell 1 base station. This means that when the power adjustment factor does not change, the user is more likely to pay for the power reduction of the small cell 1 base station as the distance from the small cell 1 base station increases. That is, there is a similar inverse proportional relationship between the SINR of the user in the small cell Small cell 1 and the price that the user pays for the power reduction of the base station of the Small cell 1.

  The relationship between the SINR of the user in the first cell and the price that the user pays for the reduction of the transmission power of the base station in the first cell by the power adjustment coefficient determined by the above research results and simulation experiments You can get it. This relationship may be an approximate expression or a table as shown in Table 2 below. In Table 2 below, the above-mentioned prostheses can be further normalized to obtain a standardized prostheses.

  Based on the above study, as shown in FIG. 5, this step 302 may specifically include the following steps.

  In step 501, determine the relationship between the SINR of the user in the first cell and the price paid by the user in the first cell for reduction of the transmission power of the base station of the first cell (for example, Table 2 above) . At step 502, the SINRs of each user in the first cell are determined. For example, the base station of the first cell receives the SINRs of each user reported by the users in the first cell. In step 503, based on the relationship between the SINR of the user in the first cell and the price paid by the user in the first cell for reduction of the transmission power of the base station of the first cell, each in the first cell The user pays for the reduction of the transmission power of the base station of the first cell. In step 504, all users in the first cell transmit in the first cell base station, adding up the price that each user in the first cell pays for reduction of the transmission power of the base station in the first cell. Get the sum of the price you pay for the reduction of power.

  In a distributed system, the method of steps 501-504 may be performed directly by the base station of the first cell. On the other hand, in the centralized system, the above steps 501 to 504 may be executed by the base station of the first cell, and the base station of the first cell transmits each user in the first cell to the base station of the first cell. Total costs paid for reduction of power and report to central controller. Alternatively, as an alternative, the central controller stores the relationship between the SINR of the user in the first cell and the price paid by the user in the first cell for reduction of the transmission power of the base station of the first cell. And the base station of the first cell is the SINR reported by each user in the first cell (in actual application, it may be indicated by 2 bits which one of the four sections in the table the SINR belongs to) , The SINRs of each user are reported to the central controller, and the central controller stores the SINRs of the users in the first cell and the base station of the first cell in which the users in the first cell are stored. Then, based on the relationship with the price paid to reduce the transmission power of each of the users, the user in the first cell determines the price to be paid for the reduction of the transmission power of the base station of the first cell, and then step 504 Run each one in the first cell The total cost for the reduction of the transmission power of the base station of the first cell, and the cost of all users in the first cell for the reduction of transmission power of the base station of the first cell. Get a sum.

  Next, the method of determining the transmission power of the base station of the first cell in step 303 will be described in detail. Specifically, in one embodiment of the present invention, the transmission power of the base station of the first cell may be determined by Equation 7 below.

Here, P is a maximum transmission power of the base station of the first cell, P _Tx is the transmit power after the adjustment of the base station of the first cell, ShigumaPain, all users in the first cell The sum of the price paid for the reduction of the transmission power of the base station of the first cell, and GaGain is the sum of the gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell is there. As described above, when the adjusted transmission power of the base station of the first cell calculated by Equation 7 above is larger than the maximum transmission power of the base station of the first cell, there is no need to adjust the transmission power, ie, The base station of the first cell still uses the maximum transmission power.

  Specifically, in another embodiment of the present invention, Equation 7 above can be improved to obtain Equation 8 below for determining the transmission power of the base station of the first cell.

Here, P is a maximum transmission power of the base station of the first cell, P _Tx is the transmit power after the adjustment of the base station of the first cell, ShigumaPain, all users in the first cell The sum of the price paid for the reduction of the transmission power of the base station of the first cell, and GaGain is the sum of the gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell is there. Also, α is a loading factor, which is related to the number of cells that can give interference to the second cell. For example, the smaller the number of cells that can give interference to the second cell, the larger the loading factor. The loading factor has a maximum value of 1 and a minimum value of greater than 0. In other words, α is related to system traffic (eg, user's arrival rate) because it interferes with neighboring cells only when there is a user in the cell.

  Table 3 below shows an example of the relationship between α and the user's arrival rate in one embodiment of the present invention. In the present embodiment, the α value may be determined based on the user's arrival rate (user's arrival rate in the first cell) and Table 3. Here, when the arrival rate of the user is 9, the resource utilization rate of the small cell is approximately 20%, but when the arrival rate of the user is 15, the resource utilization rate of the small cell is approximately 50%.

  In a distributed system, the base station of the first cell may directly determine the transmission power of its own station by the method described above. On the other hand, in a centralized system, the centralized controller may determine the transmission power of each base station in the system by the method described above, and transmit the determined transmission power to the corresponding base station.

  As can be seen from the above power control method, in determining the transmission power, the base station of the first cell can provide a throughput gain that the reduction of the transmission power of the base station of the first cell can bring to the users in the second cell. Not only considering, but also simultaneously considering the throughput cost that the user in the first cell pays for the reduction of the transmission power of the base station of the first cell, and considering the gain and the cost due to the reduction of the transmission power, When the throughput gain is larger than the throughput cost, the value of the transmission power can be appropriately reduced, whereby the capacity of the entire system can be improved by determining a preferable transmission power value.

  It should be noted that the power control method in the present invention is suitable not only for small cell environment but also for other cellular mobile communication systems.

  In addition to the power control method described above, an embodiment of the present invention also shows the internal configuration of a base station that implements the method in a distributed system.

  When the base station of the first cell is used, the internal configuration of the base station is mainly as shown in FIG. 6, mainly for the base station of the first cell of the users in all the second cells adjacent to the first cell. A gain determining means for determining the sum of gains by reduction of transmission power; and a price determining means for determining the sum of costs paid by all users in the first cell for reduction of the transmission power of the base station of the first cell. The sum of the gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell and the reduction of the transmission power of all the users in the first cell of the base station of the first cell Power determination means for determining the transmission power of the base station of the first cell based on the sum of the price to be paid.

  Here, corresponding to method 1 above, the gain determining means may specifically include the signal quality parameter of the first cell and the second cell reported to the base station of the second cell from each user in the second cell. Signal quality parameters of the second cell and the signal quality parameters of the second cell and the signals of the first cell for each user in the first receiving module, which receives from the base stations of all the second cells, respectively, and The calculation module for calculating the difference with the quality parameter, the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the transmission of the base station of the first cell of the user in the second cell The relationship between the power reduction and the gain is stored, and the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the transmission power of the base station of the first cell of the user in the second cell Relationship with the gain by And a mapping module for obtaining gain by reducing the transmission power of the base station of the first cell of each user in all the second cells, and a first cell of each user in all the second cells. And a first summing module for summing the gains due to the reduction of the transmission power of the base stations in order to obtain the sum of the gains due to the reduction of the transmission power of the base station of the first cell of the users in all the second cells. It is good.

  Corresponding to method 2 above, the gain determining means may specifically signal the signal quality parameter of the second cell and the signal of the first cell reported from each user in the second cell to the base station of the second cell. A second receiving module for receiving the difference with the quality parameter from the base stations of all the second cells, the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the difference in the second cell The relationship between the user and the gain due to the reduction of the transmission power of the base station of the first cell is stored, and the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell and the user in the second cell Gain based on the reduction of the transmission power of the base station of the first cell for each user in all the second cells based on the relation with the reduction of the transmission power of the base station of the first cell Mapping module and all the second The sum of the gain by reducing the transmission power of the base station of the first cell by the reduction of the transmission power of the base station of the first cell by adding the gain by reducing the transmission power of the base station of the first cell A first summing module to obtain.

  In response to method 3 above, the gain determining means specifically calculates the sum of the gains of the reduction in transmission power of the base station of the first cell for each user in the second cell, for all the second cells. The sum of gains due to reductions in transmission power of the base station of the first cell of the third receiving modules respectively received from the base station and each user in each second cell is further summed up to obtain the sums in all the second cells. And a second summing module for obtaining the sum of gains due to the reduction of the transmission power of the base station of the first cell of the user.

  Specifically, the price determining means comprises an SINR receiving module for receiving the signal to interference and noise ratio (SINR) of each user reported from the user in the first cell, the SINR of the user in the first cell, and the SINR. The relationship between the user and the price paid for the reduction of the transmission power of the base station of the first cell is stored, and the SINR of the user in the first cell and the reduction of the transmission power of the base station of the first cell. A second mapping module for determining the price paid by each user in the first cell for reduction of the transmission power of the base station in the first cell based on the relation with the price paid for the second cell; All the users in the first cell pay for the reduction of the transmission power of the base station of the first cell by adding up the costs that each user pays for the reduction of the transmission power of the base station of the first cell Total cost module to get the sum It may include.

  As should be described, in the centralized system, the centralized controller also has the configuration as shown in FIG. 6 above, that is, it includes gain determining means, cost determining means, and power determining means. The centralized controller may further include notification means for notifying the base station of the first cell of the determined transmission power of the base station of the first cell.

  Here, corresponding to method 1 above, the gain determining means may specifically include a first receiving module, a calculating module, a mapping module and a first summing module. Corresponding to method 2 above, the gain determining means may specifically include a second receiving module, a mapping module and a first summing module. Corresponding to method 3 above, the gain determining means may specifically include a third receiving module and a second summing module.

  Specifically, the price determining means is configured to receive a SINR of each user reported from a user in the first cell from the base station of the first cell, the second mapping module, the second mapping module, and the cost. And a summing module. Alternatively, specifically, the price determination means receives from the base station of the first cell the sum of the price paid by the user in the first cell for reduction of the transmission power of the base station of the first cell. A receiving module may be included.

  When the base station of the second cell is used, the internal configuration of the base station is as shown in FIGS. As described above, since the present cell is referred to as the first cell and all cells adjacent to the first cell are referred to as the second cell, in the following description of the base station in the case of methods 1 to 3, One cell corresponds to the second cell in methods 1 to 3 above, and the second cell corresponds to the first cell in methods 1 to 3 above.

  Here, FIG. 7 shows an internal configuration of a base station in the case of the above method 1. In this case, the base station mainly receives the signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of each second cell adjacent to the first cell, and And first reporting means for feeding back the signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of the corresponding second cell to the base station of each second cell respectively. .

  Here, FIG. 8 shows the internal configuration of the base station in the case of the above method 2. In this case, the base station mainly receives the signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of each second cell adjacent to the first cell, and , Difference calculation means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported from the user and the signal quality parameter of each second cell; And second reporting means for feeding back the difference between the signal quality parameter of the first cell reported by the user and the signal quality parameter of the corresponding second cell to the base station of each second cell.

  Here, FIG. 9 shows the internal configuration of the base station in the case of the above method 3. In this case, the base station mainly receives the signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of each second cell adjacent to the first cell, and , Difference calculating means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported from the user and the signal quality parameter of each second cell, and the signal of the first cell The relationship between the difference between the quality parameter and the signal quality parameter of each second cell and the gain that the reduction of the transmission power of the base station of the second cell brings to the user in the first cell is stored, and the user in the first cell The reduction of the transmission power of the base station of each second cell brings to the user, based on the difference between the signal quality parameter of the first cell received by the user and the signal quality parameter of each second cell. To determine each gain Ping means, summing means for calculating, for each of the second cells, the sum of gains which the reduction of the transmission power of the base station of the second cell brings to the users in the first cell, and the corresponding second cells And third reporting means for feeding back, to the base station, the sum of gains that the reduction of the transmission power of the base station of the second cell brings to the user in the first cell, respectively.

  As can be seen from the above-described internal configuration of the base station, when performing power control, the base station of the cell provides a throughput gain that reduction of the transmission power of the base station of the first cell can bring to users in the second cell. Not only considering, but also simultaneously considering the throughput cost that the user in the first cell pays for the reduction of the transmission power of the base station of the first cell, and considering the gain and the cost due to the reduction of the transmission power, When the throughput gain is larger than the throughput cost, the value of the transmission power can be appropriately reduced, whereby the capacity of the entire system can be improved by determining a preferable transmission power value.

  It should be noted that the above method and base station are suitable for power control when the initial transmit power is full power. If the base station's initial transmit power is not full power, eg, half power, the cost to pay for the reduced transmit power may be greater than the gain provided by the reduced transmit power. In this case, the above method may not be suitable.

  In this case, the research can discover the following research results. When the transmission power of the base station of a cell is increased, the interference to users in adjacent cells by the base station is increased, which reduces the throughput of users in adjacent cells. The reduction of the throughput of the user in such a neighboring cell corresponds to the price paid by the user in the neighboring cell for the increase of the transmission power of the base station of this cell. However, at the same time, since the transmission power of the base station of the present cell is increased, the throughput of users in the present cell is improved. The increase of the throughput of the user in the cell due to the increase of the transmission power of the base station of the cell corresponds to the gain of the user in the cell due to the increase of the transmission power of the base station of the cell. .

  Based on the above research results, the embodiment of the present invention provides another power control method applicable to the small cell environment. Hereinafter, for convenience of description, the present cell is similarly referred to as a first cell, and all cells adjacent to the first cell are also referred to as second cells. The specific flow of the method mainly includes the following steps, as shown in FIG.

  In step 1001, the sum of the price paid by the users in all the second cells adjacent to the first cell to increase the transmission power of the base station of the first cell is determined. In step 1002, the sum of the gains of the increase in transmission power of the base station of the first cell is determined for all users in the first cell. In step 1003, the sum of the price that the users in all the second cells pay for the increase of the transmission power of the base station of the first cell and the base station of the first cell of all the users in the first cell. The transmission power of the base station of the first cell is determined based on the sum of the gains due to the increase of the transmission power.

  Next, the method of determining the sum of the price paid by the users in all the second cells adjacent to the first cell in step 1001 for the increase of the transmission power of the base station of the first cell will be described in detail. Similarly, the difference between the signal quality parameters of the second cell and the first cell received by the user in the second cell and the base station of the first cell, with power adjustment factors determined by research and simulation experiments The relationship with the price paid for the increase of the transmission power of can be obtained. This relationship may be an approximate expression or a table.

  In this case, as shown in FIG. 11, step 1001 may specifically include the following steps. In step 1101, the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the cost to be paid for the increase of the transmission power of the base station of the first cell is calculated. decide. In step 1102, the differences in signal quality parameters between the second cell and the first cell received by each user in all the second cells are respectively determined. At step 1103, the difference between the signal quality parameter difference between the second cell and the first cell received by the user in the second cell and the price paid for the increase of the transmission power of the base station of the first cell Based on this, each user in all the second cells determines the price to be paid for the increase of the transmission power of the base station of the first cell. At step 1104, the users in all the second cells are the base stations of the first cell, adding up the price that each user in all the second cells pays for the increase of the transmission power of the base station of the first cell. The sum of the price paid for the increase of the transmission power of

  In a distributed system, a method similar to the three methods in the above-described embodiment determines the sum of the price that users in all the second cells pay for the increase of the transmission power of the base station of the first cell. It is also good. That is, in the first method, the base station of the second cell directly transmits the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell to the base of the first cell. It feeds back to the station, and the base station of the first cell executes the processing of steps 1101 to 1104. In the second method, the base station of the second cell directly sets the difference between the signal quality parameter of the second cell corresponding to each user in the second cell and the signal quality parameter of the first cell to the base of the first cell. It feeds back to the station, and the base station of the first cell executes the processing of step 1101 and steps 1103 to 1104. In the third method, it is fed back from the base station of the second cell to the base station of the first cell that all users in the second cell pay for the increase of the transmission power of the base station of the first cell. And the base station of the first cell further adds up the sum of the prices fed back from the base stations of the second cells, and the users in all the second cells are transmitted by the base station of the first cell. You can get the sum of the price you pay for the increase in power.

  In the centralized system, instead of the base station of the first cell, the centralized controller realizes the corresponding function, ie, the base station of the second cell feeds back information to the centralized controller, and the centralized controller Execute the subsequent process. That is, in the first method, the base station of the second cell directly feeds back the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell to the centralized controller. The central controller executes the processing of steps 1101 to 1104. In the second method, the base station of the second cell directly feeds back the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell corresponding to each user in the second cell to the centralized controller. The central controller executes the processing of step 1101 and steps 1103 to 1104. In the third method, it is fed back from the base station of the second cell to the central controller at the sum of the price that all users in the second cell pay for the increase of the transmission power of the base station of the first cell The central controller further sums up the sum of the price fed back from the base station of each second cell so that the users in all the second cells increase the transmission power of the base station of the first cell. You can get the sum of the price you pay.

  Next, the method of determining the sum of the gains by the increase of the transmission power of the base station of the first cell of all the users in the first cell in step 1002 will be described in detail. Similarly, to obtain the relationship between the SINR of the user in the first cell and the gain due to the increase in the transmission power of the base station of the first cell with the power adjustment coefficient determined by research and simulation experiments. Can. This relationship may be an approximate expression or a table.

  In this case, as shown in FIG. 12, the present step 1002 may specifically include the following steps. In step 1201, the relationship between the SINR of the user in the first cell and the gain due to the increase in transmission power of the base station in the first cell of the user in the first cell is determined. At step 1202, the SINRs of each user in the first cell are determined. For example, the base station of the first cell receives the SINRs of each user reported by the users in the first cell. In step 1203, based on the relationship between the SINR of the user in the first cell and the gain of the user in the first cell due to the increase in the transmission power of the base station in the first cell, each user in the first cell is , And gain by increasing the transmission power of the base station of the first cell. In step 1204, the gains by the increase in transmission power of the base station of the first cell of the users in the first cell are summed up, and the transmission powers of the base stations of the first cell of all users in the first cell Get the sum of the gains by increasing.

  In a distributed system, the method of steps 1201-1204 may be performed directly by the base station of the first cell. On the other hand, in the centralized system, the above steps 1201 to 1204 may be executed by the base station of the first cell, and the base station of the first cell is the base station of the first cell of all users in the first cell. The sum of gains due to the increase of the transmission power of is reported to the central controller. Alternatively, as an alternative, the central controller stores the relationship between the SINR of the user in the first cell and the gain by the increase in transmission power of the base station in the first cell of the user in the first cell, When the base station in the first cell receives the SINRs (which may be SINR intervals in actual applications) reported from the users in the first cell, they report the SINRs of the users to the centralized controller, The centralized controller is based on the relationship between the SINR of the user in the first cell and the gain of the user in the first cell due to the increase in the transmission power of the base station of the first cell, stored in itself. The gains of the increase in transmission power of the base station of the first cell of each user in one cell are respectively determined, and then the step 1204 is executed to set the base station of the first cell of each user in the first cell. By adding the gain due to the increase of the transmission power of All users in the le to obtain a gain sum of the increase in transmission power of the base station of the first cell.

  Next, a method of determining the transmission power of the base station of the first cell in step 1003 will be described in detail. Specifically, in one embodiment of the present invention, the transmission power of the base station of the first cell is determined according to Equation 9 below.

Here, P _original is the initial transmission power of the base station in the first cell, P _Tx is the transmission power after adjustment of the base station in the first cell, and P Pain ₁ is in all the second cells.和 Gain ₁ is the gain due to the increase of the transmission power of the base station of the first cell for all users in the first cell, which is the sum of the price that the user pays for the increase of the transmission power of the base station of the first cell Is the sum of As described above, when the adjusted transmission power of the base station of the first cell calculated by Equation 9 is smaller than the initial transmission power of the base station of the first cell, there is no need to adjust the transmission power, ie, The base station of the first cell still uses the initial transmission power.

  Specifically, in another embodiment of the present invention, Equation 9 above can be improved to obtain Equation 10 below for determining the transmission power of the base station of the first cell.

Here, P _original is the initial transmission power of the base station in the first cell, P _Tx is the transmission power after adjustment of the base station in the first cell, and P Pain ₁ is in all the second cells.和 Gain ₁ is the gain due to the increase of the transmission power of the base station of the first cell for all users in the first cell, which is the sum of the price that the user pays for the increase of the transmission power of the base station of the first cell Where α is a loading factor.

  In a distributed system, the base station of the first cell may directly determine the transmission power of its own station by the method described above. On the other hand, in a centralized system, the centralized controller may determine the transmission power of each base station in the system by the method described above, and transmit the determined transmission power to the corresponding base station.

  As can be understood from the above power control method, in determining the transmission power, the base station of the first cell can provide a throughput gain that can increase the transmission power of the base station of the first cell to the users in the first cell. Not only considering, but also simultaneously considering the throughput cost that the user in the second cell pays for the increase of the transmission power of the base station of the first cell, and considering the gain and the cost due to the increase of the transmission power, When the throughput gain is larger than the throughput cost, the value of the transmission power can be appropriately increased, whereby the capacity of the entire system can be improved by determining a preferable transmission power value.

  It should be noted that the power control method in the present invention is suitable not only for small cell environment but also for other cellular mobile communication systems.

  In addition to the power control method described above, an embodiment of the present invention also shows the internal configuration of a base station that implements the method in a distributed system.

  In the case of using the base station of the first cell, as shown in FIG. 13, the internal configuration of the base station is mainly that the users in all the second cells adjacent to the first cell are transmitted by the base station of the first cell A second price determining means for determining a sum of costs to be paid for the increase of power, and a second for determining a sum of gains of all users in the first cell due to an increase in transmission power of the base station of the first cell; Base of the first cell of the gain determining means, the sum of the price that users in all the second cells pay for the increase of the transmission power of the base station of the first cell, and the base station of the first cell of all the users in the first cell And second power determination means for determining the transmission power of the base station of the first cell based on the sum of the gains due to the increase of the transmission power.

  Here, corresponding to the above-mentioned method 1, the second charge price determining means specifically determines the signal quality parameter of the first cell reported from each user in the second cell to the base station of the second cell and The signal quality parameter of the second cell and the first cell for each first user receiving the signal quality parameters of the two cells from the base stations of all the second cells and for each user in all the second cells , A difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the user in the second cell is the base station of the first cell. The relationship between the transmission power and the expense to be paid for is stored, and the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the user in the second cell at the base station of the first cell. To increase the transmission power of A third mapping module for obtaining a price paid by each user in the second cell for an increase in the transmission power of the base station in the first cell based on the relationship with the price paid; and each user in the second cell Sums the price paid for the increase of the transmission power of the base station of the first cell, and sums the price paid by the users in all the second cells for the increase of the transmission power of the base station of the first cell And obtaining a third summing module.

  Corresponding to method 2 above, the second price determination means specifically refers to the signal quality parameter of the second cell and the first cell reported from each user in the second cell to the base station of the second cell. Of the second cell, the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the second cell. Storing the relationship between the user's expense for the increase of the transmission power of the base station of the first cell and the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and Each user in the second cell is for increasing the transmission power of the base station of the first cell, based on the relationship with the price that the users in the cell pay for the increase of the transmission power of the base station of the first cell. The third mapping module to get the price for each And the costs that each user in the second cell pays for an increase in the transmission power of the base station in the first cell, and the users in all the second cells are the base stations in the first cell. And a third summing module to obtain the sum of the price paid for the increase of the transmission power.

  Corresponding to method 3 above, the second price determination means specifically adds the sum of the price that each user in the second cell pays for the increase of the transmission power of the base station of the first cell, The fourth receiving modules respectively received from the base station of the second cell and the sum of the price that each user in each second cell pays for the increase of the transmission power of the base station of the first cell And a fourth summing module for summing the price paid by the user in the second cell for the increase of the transmission power of the base station of the first cell.

  Specifically, the second gain determining means comprises a SINR receiving module for receiving a signal to interference and noise ratio (SINR) of each user reported from a user in the first cell, a SINR of the user in the first cell, and Storing the relationship between the user's gain by increasing the transmission power of the base station in the first cell and the SINR of the user in the first cell and increasing the transmission power of the user's base station in the first cell A fourth mapping module for determining gain by increase of transmission power of the base station of the first cell of each user based on the relation with gain by the second cell, and of each user within the first cell, A gain summing module which sums the gains due to the increase of the transmission power of the base station of the first cell to obtain the sum of the gains due to the increase of the transmission power of the base station of the first cell for all users in the first cell; May be included.

  In the centralized system, the centralized controller also has the configuration as shown in FIG. 13 described above, that is, it includes the second price determination means, the second gain determination means, and the second power determination means. The centralized controller may further include notification means for notifying the base station of the first cell of the determined transmission power of the base station of the first cell.

  Here, corresponding to the above-mentioned method 1, the second price determination means may specifically include a first reception module, a calculation module, a third mapping module, and a third summation module. Corresponding to method 2 above, the second price determination means may specifically include a second receiving module, a third mapping module, and a third summing module. Corresponding to method 3 above, the second price determination means may specifically include a fourth receiving module and a fourth summing module.

  Specifically, the second gain determination unit is configured to receive, from the base station of the first cell, the SINR of each user reported from the user in the first cell, and the fourth mapping module. And the gain summing module. Alternatively, specifically, the second gain determination means is a gain sum for receiving, from the base station of the first cell, the sum of the gains of the users in the first cell due to the increase of the transmission power of the base station of the first cell. A receiving module may be included.

  The internal configuration of the base station in the case of using the base station of the second cell will be described. As described above, since the present cell is referred to as the first cell and all cells adjacent to the first cell are referred to as the second cell, in the following description of the base station in the case of methods 1 to 3, One cell corresponds to the second cell in methods 1 to 3 above, and the second cell corresponds to the first cell in methods 1 to 3 above.

  For Method 1 above, the base station mainly receives the signal quality parameters of the first cell reported by the users in the first cell and the signal quality parameters of each second cell adjacent to the first cell. First reporting means for feeding back to the base station of each second cell the receiving means, the first cell signal quality parameter reported from the user in the first cell, and the corresponding second cell signal quality parameter And may be included.

  In the case of method 2 above, the base station mainly receives the signal quality parameters of the first cell reported by the users in the first cell and the signal quality parameters of each second cell adjacent to the first cell. Receiving means, difference calculating means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported from the user and the signal quality parameter of each second cell; And second reporting means for feeding back the difference between the signal quality parameter of the first cell reported from the user in one cell and the signal quality parameter of the corresponding second cell to the base station of each second cell. .

  In the case of method 3 above, the base station mainly receives the signal quality parameters of the first cell reported by the user in the first cell and the signal quality parameters of each second cell adjacent to the first cell. Receiving means, difference calculating means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported from the user and the signal quality parameter of each second cell; Storing the relationship between the difference between the signal quality parameter of one cell and the signal quality parameter of each second cell, and the price paid by the user in the first cell for the increase of the transmission power of the base station of the second cell; For the users in the first cell, each user in the first cell may each receive a second signal based on the difference between the signal quality parameter of the first cell received by the user and the signal quality parameter of each second cell. Transmission power of 2-cell base station A second mapping means for respectively determining the price to be paid for the increase, and the sum of the price paid by the user in the first cell for the increase of the transmission power of the base station of the second cell for each of the second cells. Are fed back to the second summing means for calculating respectively and to the base station of the corresponding second cell, the sum of the price paid by the user in the first cell for the increase of the transmission power of the base station of the second cell And 4) reporting means.

  As can be seen from the above-described internal configuration of the base station, when performing power control, the base station of the cell provides a throughput gain that can increase the transmission power of the base station of the first cell to the users in the first cell. Not only considering, but also simultaneously considering the throughput cost that the user in the second cell pays for the increase of the transmission power of the base station of the first cell, and considering the gain and the cost due to the increase of the transmission power, When the throughput gain is larger than the throughput cost, the value of the transmission power can be appropriately increased, whereby the capacity of the entire system can be improved by determining a preferable transmission power value.

  Furthermore, the present invention also provides a dynamic power adjustment method combining the power control methods of the two embodiments described above. In this method of dynamically adjusting power, first, the sum of the gain of the users in all the second cells adjacent to the first cell due to the reduction of the transmission power of the base station in the first cell and all in the first cell The sum of the price paid by the user of the first cell for reducing the transmission power of the base station and the sum of the price paid by the users in all the second cells for the increase of the transmission power of the base station of the first cell And the sum of gains of all users in the first cell due to the increase in transmission power of the base station in the first cell. Then, the sum of the gain that the reduction of the transmission power of the base station of the first cell brings to the users in the second cell and the cost that the users in the first cell pay for the reduction of the transmission power of the base station of the first cell , The sum of the gain that the increase of the transmission power of the base station of the first cell brings to the users in the first cell, and the increase of the transmission power of the base station of the first cell for the users in the second cell. The transmission power of the base station of the first cell is determined based on the four parameters with the sum of the price to be paid, ie, it is necessary to adjust the transmission power of the base station of the first cell, and transmission Decide whether to increase power or reduce transmission power. If it is determined that the transmission power needs to be reduced, the transmission power of the base station of the first cell needs to be determined and the transmission power needs to be increased according to the power control method by the reduction of the transmission power in the above embodiment. If determined, the transmission power of the base station of the first cell is determined according to the power control method by the increase of the transmission power in the above embodiment.

  For example, the sum of the gain that the reduction of the transmission power of the base station of the first cell brings to the users in the second cell, and the price that the users in the first cell pay for the reduction of the transmission power of the base station of the first cell The difference with the sum is the sum of the gain that the increase of the transmission power of the base station of the first cell brings to the users in the first cell and the increase of the transmission power of the base station of the first cell by the users in the second cell. If the difference with the sum of the price to be paid for is larger, it means that the gain due to the reduction of the transmission power is larger, and the transmission power should be reduced. Conversely, the sum of the gain that the reduction of the transmission power of the base station of the first cell brings to the users in the second cell and the user within the first cell pay for the reduction of the transmission power of the base station of the first cell The difference from the sum of costs is the sum of the gain that the increase of the transmission power of the base station of the first cell brings to the users in the first cell and the transmission power of the transmission power of the base station of the first cell by the users in the second cell. If it is smaller than the difference with the sum of the price paid for the increase, the gain due to the increase of the transmission power is represented to be larger, and the transmission power should be increased.

  The above is only a preferred embodiment of the present invention, and does not limit the protection scope of the present invention. All modifications, equivalent replacements, improvements and the like made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (32)

A power control method,
Determine the sum of the gains of the users in all the second cells adjacent to the first cell due to the reduction of the transmission power of the base station of the first cell,
Determine the sum of the price that all users in the first cell will pay for the reduction of the transmission power of the base station of the first cell,
The sum of the gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell, and the sum of the transmission power of all the users in the first cell of the base stations of the first cell The transmission power of the base station of the first cell is determined based on the sum of the price paid for reduction.
A method characterized by comprising. It is possible to determine the sum of gains due to the reduction of the transmission power of the base station of the first cell of the users in all the second cells adjacent to the first cell,
Determine the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the gain due to the reduction of the transmission power of the base station of the first cell,
Determine the difference in signal quality parameters between the second cell and the first cell received by each user in all the second cells,
Based on the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the gain due to the reduction of the transmission power of the base station of the first cell, Determine the gain of the reduction in transmission power of the base station of the first cell for each user in all the second cells;
The gain by reduction of the transmission power of the base station of the first cell of each user in all the second cells is summed up, and the base station of the first cell of the users in all the second cells Obtaining the sum of gains by reducing the transmission power,
A method according to claim 1, characterized in that. The relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the gain due to the reduction of the transmission power of the base station of the first cell is:
The smaller the difference between the signal quality parameters of the second cell and the first cell received by the user in the second cell, the larger the gain due to the reduction of the transmission power of the base station of the first cell, including,
A method according to claim 2, characterized in that. Determining the difference between the signal quality parameters of the second cell and the first cell received by each user in all the second cells respectively:
The base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell, and receives the base of the first cell. Feed back to the
The signal quality parameter of the second cell and the signal of the first cell received by each user in the second cell, the base station of the first cell being fed back from the base stations of all the second cells Receive quality parameters and
For each user in all the second cells, the base station of the first cell is the signal quality parameter of the second cell and the first cell received by each user in all the second cells. Calculate each difference, including
A method according to claim 2, characterized in that. Determining the difference between the signal quality parameters of the second cell and the first cell received by each user in all the second cells respectively:
The base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell,
The base station of the second cell calculates the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell for each user in the second cell, and Feed back to the base station of
The signal quality parameter of the second cell and the signal of the first cell received by each user in the second cell, the base station of the first cell being fed back from the base stations of all the second cells Receive the difference with the quality parameter, including
A method according to claim 2, characterized in that. Determining the difference in signal quality parameters between the second cell and the first cell received by each user in all the second cells respectively:
The base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell, and each cell in the second cell For each user, the base station of the second cell calculates the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, respectively;
For each user in all the second cells, it is possible to determine the gain by reducing the transmission power of the base station of the first cell respectively:
The base station of the second cell is the difference in reference signal reception power between the second cell and the first cell received by each user in the second cell, and the base station of the first cell. Determining the gain by reducing the transmission power of the base station of the first cell for each user in the second cell based on the relationship with the gain by reducing the transmission power, respectively;
Summarizing the gain by reducing the transmission power of the base station of the first cell of each user in all the second cells:
The base station of the second cell sums the gains of the reduction of the transmission power of the base station of the first cell of each user in the second cell, and The sum of gains due to reduction of transmission power of the base station of one cell is fed back to the base station of the first cell, and the base station of the first cell is fed back from the base stations of all the second cells. Further summing up the sums to obtain a sum of gains of the users in all of the second cells due to the reduction of the transmission power of the base station of the first cell,
A method according to claim 2, characterized in that. Determining the difference between the signal quality parameters of the second cell and the first cell received by each user in all the second cells respectively:
The base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell and feeds it back to the centralized controller. ,
The centralized controller is a signal quality parameter of the second cell received by each user in the second cell and a signal quality parameter of the first cell, which are fed back from base stations of all the second cells, and Receive
For each user in all the second cells, the central controller determines the difference in signal quality parameter between the second cell and the first cell received by each user in all the second cells. Calculate each, including
A method according to claim 2, characterized in that. Determining the difference between the signal quality parameters of the second cell and the first cell received by each user in all the second cells respectively:
The base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell,
For each user in the second cell, the base station of the second cell calculates the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and Feedback
The centralized controller is a signal quality parameter of the second cell received by each user in the second cell and a signal quality parameter of the first cell, which are fed back from base stations of all the second cells, and Receive the difference, including
A method according to claim 2, characterized in that. Determining the difference in signal quality parameters between the second cell and the first cell received by each user in all the second cells respectively:
The base station of the second cell receives the signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell, and each cell in the second cell For each user, the base station of the second cell calculates the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, respectively;
For each user in all the second cells, it is possible to determine the gain by reducing the transmission power of the base station of the first cell respectively:
The base station of the second cell is the difference in reference signal reception power between the second cell and the first cell received by each user in the second cell, and the base station of the first cell. Determining the gain by reducing the transmission power of the base station of the first cell for each user in the second cell based on the relationship with the gain by reducing the transmission power, respectively;
Summarizing the gain by reducing the transmission power of the base station of the first cell of each user in all the second cells:
The base station of the second cell sums the gains of the reduction of the transmission power of the base station of the first cell of each user in the second cell, and The sum of gains due to the reduction of the transmission power of the base station of one cell is fed back to the centralized controller, and the centralized controller further sums the sum of the gains fed back from the base stations of all the second cells. Obtaining the sum of the gain of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell,
A method according to claim 2, characterized in that. It is possible to determine the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell,
Determine the relationship between the signal to interference and noise ratio (SINR) of the user in the first cell and the price paid by the user for the reduction of the transmission power of the base station of the first cell,
Determine SINR of each user in the first cell, respectively;
Each user in the first cell is the first user based on the relationship between the SINR of the user in the first cell and the price paid by the user for reduction of the transmission power of the base station in the first cell. Determine the price to be paid for the reduction of transmission power of the cell base station
All users in the first cell are transmitted by the base station of the first cell, adding up the price that each user in the first cell pays for the reduction of the transmission power of the base station of the first cell. Including the sum of the price paid for the reduction of power, including
A method according to claim 1, characterized in that. The relationship between the signal to interference and noise ratio (SINR) of the user in the first cell and the price paid by the user for the reduction of the transmission power of the base station of the first cell is:
The smaller the SINR of the user in the first cell, the higher the price paid by the user for the reduction of the transmission power of the base station of the first cell,
11. A method according to claim 10, characterized in that. The determination of the transmission power of the base station of the first cell is

Determining the transmission power of the base station of the first cell according to
Here, P is the the maximum transmission power of the base station of the first cell, P _Tx is the transmit power after the adjustment of the base station of the first cell, ShigumaPain all in the first cell Is the sum of the price paid by the user for reduction of the transmission power of the base station of the first cell, and .SIGMA.Gain is the transmission power of the transmission power of the base station of the first cell of the users in all the second cells. The sum of the gains due to reduction,
A method according to claim 1, characterized in that. The determination of the transmission power of the base station of the first cell is

Determining the transmission power of the base station of the first cell according to
Here, P is the the maximum transmit power for the base station of the first cell, P _Tx is the transmit power after the adjustment of the base station of the first cell, ShigumaPain all in the first cell Is the sum of the price paid by the user for reduction of the transmission power of the base station of the first cell, and .SIGMA.Gain is the transmission power of the transmission power of the base station of the first cell of the users in all the second cells. The sum of gains due to reduction, α is a loading factor, and is related to the number of cells that can give interference to the second cell,
A method according to claim 1, characterized in that. The smaller the number of cells that can give interference to the second cell, the larger α is,
The method according to claim 13, characterized in that. A base station,
Gain determining means for determining the sum of the gains of the users in all the second cells adjacent to the first cell due to the reduction of the transmission power of the base station of the first cell;
Price determination means for determining the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell;
The sum of the gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell, and the sum of the transmission power of all the users in the first cell of the base stations of the first cell Power determination means for determining the transmission power of the base station of the first cell based on the sum of the price paid for reduction;
A base station characterized by including. The gain determining means may
The signal quality parameter of the first cell and the signal quality parameter of the second cell reported from each user in the second cell to the base station of the second cell from the base stations of all the second cells A first receiving module for receiving each;
A calculation module for calculating the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell for each user in all the second cells;
The relationship between the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell and the gain of the user in the second cell due to the reduction of the transmission power of the base station of the first cell is stored Relationship between the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the gain of the user in the second cell due to the reduction of the transmission power of the base station of the first cell. A mapping module for obtaining gain by reducing the transmission power of the base station of the first cell for each user in all the second cells, based on
The gain by reduction of the transmission power of the base station of the first cell of each user in all the second cells is summed up, and the base station of the first cell of the users in all the second cells A first summing module for obtaining the sum of gains due to the reduction of transmission power;
The base station according to claim 15, characterized in that it comprises: The gain determining means may
The difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell reported from each user in the second cell to the base station of the second cell is the difference of all the second cells. A second receiving module respectively receiving from the base station;
The relationship between the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell and the gain of the user in the second cell due to the reduction of the transmission power of the base station of the first cell is stored Relationship between the difference between the signal quality parameter of the second cell and the signal quality parameter of the first cell, and the gain of the user in the second cell due to the reduction of the transmission power of the base station of the first cell. A mapping module for obtaining gain by reducing the transmission power of the base station of the first cell for each user in all the second cells, based on
The gain by reduction of the transmission power of the base station of the first cell of each user in all the second cells is summed up, and the base station of the first cell of the users in all the second cells A first summing module for obtaining the sum of gains due to the reduction of transmission power;
The base station according to claim 15, characterized in that it comprises: The gain determining means may
A third receiving module for receiving, from each of the base stations of all the second cells, the sum of the gains of the reduction power of the transmission power of the base station of the first cell of each user in the second cell;
The sum of gains by reduction of the transmission power of the base station of the first cell of each user in each of the second cells is further summed up, and the base of the first cell of the users in all the second cells A second summing module to obtain the sum of gains due to the reduction of the station's transmit power;
The base station according to claim 15, characterized in that it comprises: The price determining means is
A SINR receiving module for receiving a signal to interference and noise ratio (SINR) of each user reported from a user in the first cell;
Storing the relationship between the SINR of the user in the first cell and the price that the user pays for the reduction of the transmission power of the base station of the first cell, the SINR of the user in the first cell, Each user in the first cell is for reducing the transmission power of the base station of the first cell based on the relationship with the price that the user pays for the reduction of the transmission power of the base station of the first cell. A second mapping module which determines the price to be paid respectively;
All users in the first cell are transmitted by the base station of the first cell, adding up the price that each user in the first cell pays for the reduction of the transmission power of the base station of the first cell. Total cost module to get the sum of the cost to pay for the reduction of power,
The base station according to claim 15, characterized in that it comprises: A base station,
Receiving means for receiving a signal quality parameter of the first cell reported by a user in the first cell and a signal quality parameter of each second cell adjacent to the first cell;
The first signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of the corresponding second cell are respectively fed back to the base station or centralized controller of each of the second cells. Reporting means,
Only including,
The signal quality parameter of the first cell and the signal quality parameter of the second cell are determined by the base station or centralized controller of the second cell of the users in all the first cells adjacent to the second cell, Determine the sum of the gain due to the reduction of the transmission power of the base station of the second cell, or the sum of the price paid by the users in all the first cells for the increase of the transmission power of the base station of the second cell Used to
A base station characterized by A base station,
Receiving means for receiving a signal quality parameter of the first cell reported by a user in the first cell and a signal quality parameter of each second cell adjacent to the first cell;
Difference calculation means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported by the user and the signal quality parameter of the second cell;
The difference between the signal quality parameter of the first cell reported from the user in the first cell and the signal quality parameter of the corresponding second cell is fed back to the base station or centralized controller of each of the second cells. Second reporting means,
Only including,
The difference is a gain of the base station or centralized controller of the second cell due to the reduction of the transmission power of the base station of the second cell of the users in all the first cells adjacent to the second cell. Used to determine the sum or the sum of the price that users in all the first cells pay for the increase of the transmission power of the base station of the second cell,
A base station characterized by A base station,
Receiving means for receiving a signal quality parameter of the first cell reported by a user in the first cell and a signal quality parameter of each second cell adjacent to the first cell;
Difference calculation means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported by the user and the signal quality parameter of the second cell;
The relationship between the difference between the signal quality parameter of the first cell and the signal quality parameter of each second cell and the gain that the reduction of the transmission power of the base station of the second cell brings to the user in the first cell is Storing and, for a user in said first cell, each said second cell based on the difference between the signal quality parameter of said first cell received by said user and the signal quality parameter of each said second cell Mapping means for respectively determining the gain that the reduction of the transmission power of the base station brings to the user;
Summing means for calculating, for each of the second cells, a sum of gains which the reduction of the transmission power of the base station of the second cells brings to the users in the first cells;
Third reporting means for feeding back, to the corresponding second cell base station or centralized controller, the sum of gains provided by the reduction of the transmission power of the second cell base station to the users in the first cell, respectively;
A base station characterized by including. A power control method,
Determine the sum of the price that users in all the second cells adjacent to the first cell pay for the increase of the transmission power of the base station of the first cell,
Determine the sum of gains due to the increase of the transmission power of the base station of the first cell for all users in the first cell;
The sum of the price that the users in all the second cells pay for the increase of the transmission power of the base station of the first cell and the increase of the transmission power of the base station of the first cell of all the users in the first cell The transmission power of the base station of the first cell is determined based on the sum of gains by
A method characterized by comprising. It is possible to determine the sum of the price that the users in all the second cells adjacent to the first cell pay for the increase of the transmission power of the base station of the first cell,
Determine the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the price paid for the increase of the transmission power of the base station of the first cell,
Determine the difference between the signal quality parameters of the second cell and the first cell received by each user in all the second cells respectively;
All based on the relationship between the difference between the signal quality parameter of the second cell and the first cell received by the user in the second cell and the price paid for the increase of the transmission power of the base station of the first cell Determine the price each user in the second cell pays for the increase of the transmission power of the base station of the first cell,
Users in all second cells pay for the increase in transmission power of the base station of the first cell, and the users in all second cells are the transmission power of the base station of the first cell. Get the sum of the price you pay for the increase, including
A method according to claim 23, characterized in that. Determining the sum of gains due to the increase of the transmission power of the base station of the first cell of all the users in the first cell,
Determine the relationship between the signal to interference and noise ratio (SINR) of the users in the first cell and the gain of the users in the first cell due to the increase of the transmission power of the base station of the first cell,
Determine the SINR of each user in the first cell,
The first cell of each user in the first cell based on the relationship between the SINR of the user in the first cell and the gain of the user in the first cell due to the increase of the transmission power of the base station of the first cell Determine the gains due to the increase of the transmission power of
The gain by increase of the transmission power of the base station of the first cell of each user in the first cell is summed up, and the gain by increase of the transmission power of the base station of the first cell of all users in the first cell Get the sum of, including
A method according to claim 23, characterized in that. The determination of the transmission power of the base station of the first cell is

Determining the transmission power of the base station of the first cell by
Here, P _original is the initial transmission power of the base station in the first cell, P _Tx is the transmission power after adjustment of the base station in the first cell, and P Pain ₁ is in all the second cells.和 Gain ₁ is the gain due to the increase of the transmission power of the base station of the first cell for all users in the first cell, which is the sum of the price that the user pays for the increase of the transmission power of the base station of the first cell Is the sum of
A method according to claim 23, characterized in that. The determination of the transmission power of the base station of the first cell is

Determining the transmission power of the base station of the first cell by
Here, P _original is the initial transmission power of the base station in the first cell, P _Tx is the transmission power after adjustment of the base station in the first cell, and P Pain ₁ is in all the second cells.和 Gain ₁ is the gain due to the increase of the transmission power of the base station of the first cell for all users in the first cell, which is the sum of the price that the user pays for the increase of the transmission power of the base station of the first cell Where α is the loading factor,
A method according to claim 23, characterized in that. A base station,
Second price determining means for determining a sum of costs paid by users in all second cells adjacent to the first cell for an increase in transmission power of the base station of the first cell;
Second gain determining means for determining a sum of gains due to an increase in transmission power of the base station of the first cell of all users in the first cell;
The sum of the price that the users in all the second cells pay for the increase of the transmission power of the base station of the first cell and the increase of the transmission power of the base station of the first cell of all the users in the first cell Second power determination means for determining the transmission power of the base station of the first cell based on the sum of gains by
A base station characterized by including. The second gain determining means
A SINR receiving module for receiving the signal to interference and noise ratio (SINR) of each user reported from the users in the first cell;
The relationship between the SINR of the user in the first cell and the gain due to the increase of the transmission power of the base station in the first cell is stored, and the SINR of the user in the first cell and the first user of the user A fourth mapping module for determining gains by the increase of the transmission power of the base station of the first cell, based on the relationship with the gain by the increase of the transmission power of the base station of the cell;
The gain by increase of the transmission power of the base station of the first cell of each user in the first cell is summed up, and the gain by increase of the transmission power of the base station of the first cell of all users in the first cell Gain sum module to obtain the sum of
The base station according to claim 28, characterized in that it comprises A base station,
Receiving means for receiving a signal quality parameter of the first cell reported by a user in the first cell and a signal quality parameter of each second cell adjacent to the first cell;
Difference calculation means for calculating, for each user in the first cell, the difference between the signal quality parameter of the first cell reported by the user and the signal quality parameter of each second cell;
The relationship between the difference between the signal quality parameter of the first cell and the signal quality parameter of each second cell and the price paid by the user in the first cell for the increase of the transmission power of the base station of the second cell is stored For each user in the first cell, each user in the first cell is each based on the difference between the signal quality parameter of the first cell received by the user and the signal quality parameter of each second cell. A second mapping means for respectively determining the price to be paid for the increase of the transmission power of the base station of the second cell;
A second summing means for calculating, for each of the second cells, the sum of the price paid by the user in the first cell for the increase of the transmission power of the base station of the second cell;
Fourth reporting means for feeding back the sum of the price paid by the user in the first cell for the increase of the transmission power of the base station in the second cell to the corresponding second cell base station, and
A base station characterized by including. A centralized controller,
Gain determining means for determining the sum of the gains of the users in all the second cells adjacent to the first cell due to the reduction of the transmission power of the base station of the first cell;
Price determination means for determining the sum of the price that all users in the first cell pay for the reduction of the transmission power of the base station of the first cell;
The sum of the gains of the users in all the second cells due to the reduction of the transmission power of the base station of the first cell, and the sum of the transmission power of all the users in the first cell of the base stations of the first cell Power determination means for determining the transmission power of the base station of the first cell based on the sum of the price paid for reduction;
Notification means for notifying the base station of the first cell of the determined transmission power of the base station of the first cell;
A centralized controller characterized by including. A centralized controller,
Second price determining means for determining a sum of costs paid by users in all second cells adjacent to the first cell for an increase in transmission power of the base station of the first cell;
Second gain determining means for determining a sum of gains due to an increase in transmission power of the base station of the first cell of all users in the first cell;
The sum of the price that the users in all the second cells pay for the increase of the transmission power of the base station of the first cell and the increase of the transmission power of the base station of the first cell of all the users in the first cell Second power determination means for determining the transmission power of the base station of the first cell based on the sum of gains by
Notification means for notifying the base station of the first cell of the determined transmission power of the base station of the first cell;
A centralized controller characterized by including.

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