Wireless communication device for controlling a target transmission power of a target cell using a classification of an overall channel quality in a cell cluster

Abstract

A wireless communication device, a wireless communication method and a wireless communication system. The wireless communication device includes: a classification unit, used for, based on the channel qualities of downlinks of a target cell and other cells in a cell cluster on a specific resource block, classifying the overall condition of the channel quality; and a control unit, used for controlling, so as to determine the target transmitting power of the target cell on the specific resource block by using a power distribution method adapting to the classification. According to the scheme, the system throughput of a wireless network on the specific resource block under dense cell distribution can be maximized.

1 . A wireless communication device, comprising:
 circuitry configured to
 classify an overall channel quality based on the channel qualities of downlinks, on a specific resource block, of a target cell and other cells in a cell cluster; and 
 control a target transmission power, on the specific resource block, of the target cell using the classification of the overall channel quality so that the target cell operates with the target transmission power. 
   
     
     
         2 . The wireless communication device of  claim 1 , wherein
 according to a predetermined classification criterion, the classification of the overall channel quality comprises at least one of a first classification (good), a second classification (normal), and a third classification (bad).   
     
     
         3 . The wireless communication device of  claim 2 , wherein
 each of the channel qualities is characterized by a signal to interference plus noise ratio (SINR).   
     
     
         4 . The wireless communication device of  claim 3 , wherein the predetermined classification criterion comprises:
 the overall channel quality is classified as the first classification (good) if SINRs of the target cell and the other cells are greater than a threshold value by a first predetermined amount;   the overall channel quality is classified as the third classification if SINRs of the target cell and the other cells are less than a threshold value by a predetermined amount; and   the overall channel quality is classified as the second classification in other cases.   
     
     
         5 . The wireless communication device of  claim 1 , wherein
 the circuitry is configured to calculate an inter-cell SINR of the target cell with respect to a first other cell on the specific resource block.   
     
     
         6 . The wireless communication device of  claim 5 , wherein
 the inter-cell SINR is defined as: a ratio of the interference on the first other cell from the target cell versus a sum of all interference and noise the first other cell is subjected to, on the specific resource block.   
     
     
         7 . The wireless communication device of  claim 6 , wherein
 the circuitry is configured to calculate a sum of inter-cell SINRs of the target cell with respect to all of other cells in the cell cluster on the specific resource block.   
     
     
         8 . The wireless communication device of  claim 7 , wherein the circuitry is configured to control so as to:
 determine the target transmission power by decreasing, by a certain step length, transmission power of the target cell on the specific resource block if it is determined that the sum of the inter-cell SINRs is greater than 1.   
     
     
         9 . A wireless communication method, comprising:
 classifying, using circuitry, an overall channel quality based on the channel qualities of downlinks, on a specific resource block, of a target cell and other cells in a cell cluster; and   controlling a target transmission power, on the specific resource block, of the target cell using the classification of the overall channel quality so that the target cell operates with the target transmission power.   
     
     
         10 . A wireless communication device, comprising:
 circuitry configured to
 classify a user equipment in a cell cluster based on average channel quality of downlinks to the user equipment in a predetermined time period; 
 allocate a resource block set to the user equipment at least partly based on a classification of the user equipment, wherein the resource block set is allocated to user equipments of the same classification; and 
 control a target transmission power of a target cell on a specific resource block using the classification of the user equipment scheduled by the target cell on the specific resource block so that the target cell operates with the target transmission power. 
   
     
     
         11 . The wireless communication device of  claim 10 , wherein
 the average channel quality is characterized by an average SINR of the user equipment in the predetermined time period.   
     
     
         12 . The wireless communication device of  claim 11 , wherein the circuitry is further configured to:
 classify the user equipment into a first type if the average SINR is greater than a threshold value by a first predetermined amount;   classify the user equipment into a second type if the average SINR is less than the threshold value by a second predetermined amount; and   classify the user equipment into a third type if it is not classified as the first type or the second type.   
     
     
         13 . The wireless communication device of  claim 10 , wherein
 the circuitry is configured to allocate the resource block set to the user equipment at least partly based on the numbers of user equipments of different types.   
     
     
         14 . The wireless communication device of  claim 13 , wherein
 the circuitry is configured to allocate the resource block set at least partly based on service requirements of the user equipments of different types.   
     
     
         15 . The wireless communication device of  claim 13 , wherein
 the circuitry is configured to calculate an inter-cell SINR of the target cell with respect to a first non-target cell on the specific resource block, wherein the inter-cell SINR is defined as: a ratio of the interference on the first non-target cell from the target cell versus a sum of all interference and noise the first non-target cell is subjected to, on the specific resource block.   
     
     
         16 . The wireless communication device of  claim 15 , wherein
 the circuitry is configured to calculate a sum of inter-cell SINRs of the target cell with respect to all of non-target cells in the cell cluster on the specific resource block.   
     
     
         17 . The wireless communication device of  claim 16 , wherein the circuitry is configured to:
 determine whether the sum of the inter-cell SINRs is less than 1 if the user equipment is of the first type; and   determine the target transmission power of the target cell on the specific resource block, by making a first-order partial derivative of a total throughput of all cells in the cell cluster on the specific resource block with respect to transmission power of the target cell on the specific resource block equal to 0, if it is determined that the sum of the inter-cell SINRs is less than 1.   
     
     
         18 . The wireless communication device of  claim 16 , wherein the circuitry is configured to:
 determine whether the sum of the inter-cell SINRs is less than 1 if the user equipment is of the first type; and   determine the target transmission power by decreasing, by a certain step length, transmission power of the target cell on the specific resource block, if it is determined that the sum of the inter-cell SINRs is not less than 1.   
     
     
         19 . The wireless communication device of  claim 12 , wherein
 the circuitry is configured to determine the target transmission power of the target cell on the specific resource block by making a first-order partial derivative of a total throughput of all cells in the cell cluster on the specific resource block with respect to transmission power of the target cell on the specific resource block equal to 0, if the user equipment is of the second type.   
     
     
         20 . The wireless communication device of  claim 12 , wherein the circuitry is configured to:
 respectively compare values of first-order and second-order partial derivatives of a total throughput of all cells in the cell cluster on the specific resource block with respect to transmission power of the target cell on the specific resource block with 0; and   determine the target transmission power of the target cell on the specific resource block by making the first-order partial derivative equal to 0, in a case that the user equipment is of the third type and it is determined by the calculation unit via the comparison that the value of the first-order partial derivative is greater than 0 and the value of the second-order partial derivative is less than 0.