Physical cell identifier allocation method and apparatus

Patent metadata

Field	Value
Publication number	US-10075842-B2
Application number	US-201515114825-A
Country	US
Kind code	B2
Filing date	Jan 27, 2015
Priority date	Jan 27, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

The present invention relates to the technical field of wireless communications. Disclosed are a physical cell identifier allocation method and an apparatus. In a scheme, when allocating a physical cell identifier, first determining a degree of interference of each type of an adjacent cell to a main cell for which a physical cell identifier needs to be allocated, and then performing allocation for the main cell based on a remainder value corresponding to a minimum degree of interference, thus implementing effective reduction of reference signal interference and improving effectiveness of reducing reference signal interference.

First claim

What is claimed is:

1. A method for allocating a physical cell identifier, the method comprising:
obtaining, by a network device, cell wireless measurement index information of each of sampling points associated with an allocation target cell for which a physical cell identifier needs to be allocated, wherein the cell wireless measurement index information characterizes a quality of signal of a cell, and the cell wireless measurement index information comprises at least a Reference Signal Receive Power, RSRP, value and a Signal to Interference and Noise Ratio, SINR, value;
determining, by the network device, a co-channel interference sampling point from the sampling points associated with the allocation target cell according to the cell wireless measurement index information, and determining an adjacent cell according to the cell wireless measurement index information of the co-channel interference sampling point;
determining, by the network device, a remainder of current physical cell identifier MOD 3 of the determined adjacent cells, and classifying adjacent cells with identical remainder into a same category; and
determining, by the network device, a degree of interference from each of categories of adjacent cells to the allocation target cell according to the cell wireless measurement index information, and allocating a physical cell identifier for the allocation target cell according to a remainder corresponding to a minimum interference degree;
wherein determining the degree of interference from each of the categories of adjacent cells to the allocation target cell according to the cell wireless measurement index information comprises:
for each category of adjacent cells, calculating a degree of interference from each of the adjacent cells in the category, and determining a sum of the calculated degrees of interference from respective adjacent cells in the category as the degree of interference from the category of adjacent cells to the allocation target cell.

2. The method according to claim 1 , wherein determining the co-channel interference sampling point according to the cell wireless measurement index information comprises:
determining a sampling point with its RSRP value below a preset threshold of weak coverage, and a SINR value below a preset SINR threshold as the co-channel interference sampling point.

3. The method according to claim 2 , wherein after the adjacent cell is determined according to the cell wireless measurement index information of the co-channel interference sampling point, and before the remainder of the current physical cell identifier MOD 3 of the determined adjacent cells is determined, and the adjacent cells with identical remainders are classified into the same category, the method further comprises:
calculating a first performance attribute value of each of the adjacent cells, wherein the first performance attribute value characterizes receive power strength of the adjacent cell; and
determining an adjacent cell with its first performance attribute value above an adjacent cell interference threshold as a target interference adjacent cell; and
determining the remainder of the current physical cell identifier MOD 3 of the determined adjacent cell, and classifying the adjacent cells with identical remainders into the same category comprises:
determining a remainder of the current physical cell identifier MOD 3 of the target interference adjacent cell, and classifying the adjacent cells with identical remainder into the same category.

4. The method according to claim 1 , wherein after the adjacent cell is determined according to the cell wireless measurement index information of the co-channel interference sampling point, and before the remainder of the current physical cell identifier MOD 3 of the determined adjacent cells is determined, and the adjacent cells with identical remainders are classified into the same category, the method further comprises:
calculating a first performance attribute value of each of the adjacent cells, wherein the first performance attribute value characterizes receive power strength of the adjacent cell; and
determining an adjacent cell with its first performance attribute value above an adjacent cell interference threshold as a target interference adjacent cell; and
determining the remainder of the current physical cell identifier MOD 3 of the determined adjacent cell, and classifying the adjacent cells with identical remainders into the same category comprises:
determining a remainder of the current physical cell identifier MOD 3 of the target interference adjacent cell, and classifying the adjacent cells with identical remainder into the same category.

5. The method according to claim 4 , wherein calculating the first performance attribute value of each of the adjacent cells comprises:
performing following operations respectively for any one of the adjacent cells:
picking out all of second performance attribute values corresponding to the adjacent cell from all the cell wireless measurement index information corresponding to all interference sampling points, wherein any one of the second performance attribute values corresponding to the adjacent cell characterizes receive power strength of the adjacent cell; and
determining an average of all the picked-out second performance attribute values as the first performance attribute value of the adjacent cell.

6. The method according to claim 1 , wherein calculating the degree of interference from each of the adjacent cells in the category comprises:
performing following operations respectively for any one of the adjacent cells:
determining all of associated interference sampling points with their corresponding cell wireless measurement index information comprising second performance attribute values of the adjacent cell;
for any one of the associated interference sampling points, calculating a degree of sub-interference from the adjacent cell to the allocation target cell according to the cell wireless measurement index information of the allocation target cell corresponding to the associated interference sampling point, and the second performance attribute value for the adjacent cell, wherein the cell wireless measurement index information corresponding to the associated interference sampling point has a negative correlation with the sub-interference degree, and the second performance attribute value for the adjacent cell has a positive correlation with the sub-interference degree; and
determining a sum of all the calculated sub-interference degrees as the degree of interference from the adjacent cell.

7. The method according to claim 1 , wherein allocating the physical cell identifier for the allocation target cell according to the remainder corresponding to the minimum interference degree comprises:
determining a remainder corresponding to the minimum interference degree as a Primary Synchronization Signal, PSS, in the physical cell identifier of the allocation target cell.

8. An apparatus for allocating a physical cell identifier, comprising:
a processor; and
a memory storing at least one instruction, wherein the processor is configured to execute the at least one instruction to:
obtain cell wireless measurement index information of each of sampling points associated with an allocation target cell for which a physical cell identifier needs to be allocated, wherein the cell wireless measurement index information characterizes a quality of signal of a cell, and the cell wireless measurement index information comprises at least a Reference Signal Receive Power, RSRP, value and a Signal to Interference and Noise Ratio, SINR, value;
determine a co-channel interference sampling point from the sampling points associated with

Assignees

• Shanghai datang mobile communications equipment co ltd
• Datang mobile communications equipment co ltd

Inventors

• Zhou Wenqian
• He Yusong

Classifications

• H04B17/318

  Received signal strength · CPC title

• H04B17/336

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title