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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsRafael Celedon, Ali Shah, Julio Velo, Dwight Inman
Estimating the term…
A count is made of the number of mobile assisted handoff (MAHO) attempts between a service cell and a targeted cell. A count is also made of the number of times the targeted cell is considered a Best Candidate (BestCand) for handoff from the service cell. If the targeted cell is not included in the service cell's neighbor list, a potential neighbor cell (PNC), hysteresis is added to the targeted cell to prevent handoffs to the targeted cell. The MAHO and BestCand counts are determined and if the counts meet or exceed predetermined threshold values the targeted cell is added to the list. If the targeted cell is on the neighbor list, no hysteresis is added. If the count data does not meet or exceed the threshold values, the target is removed from the list
A method for adding a cell to a neighbor list comprising the steps of:
A base station in a wireless telecommunications system, comprising:
A method for modifying a neighbor list in a cellular telecommunications network, comprising the steps of:
Dependencies are inferred from the claim text.
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Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists: hand-off measurements
Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists: determination of neighbour cell lists
Wireless communication networks
Term end not estimated
1 Technical Field of the Invention
The present invention relates to digital wireless communication systems. More particularly, the present invention relates to neighboring cells within a digital wireless communication system. Even more particularly, the present invention relates to managing neighbor-cell lists within the digital wireless communication system.
2 Description of Related Art
The invention will be better understood and its numerous objects and advantages will become more apparent to those skilled in the art by reference to the following drawings, in conjunction with the accompanying specification, in which:
FIG. 1 depicts a high level diagram of a network in which a neighbor-cell is considered for removal from a neighbor list, in accordance with a preferred embodiment of the present invention;
FIG. 2 depicts a method for identifying cells that are to be removed or restricted from a neighbor list, according to a preferred embodiment of the present invention
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, interfaces, techniques, etc. in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments that depart from theses specific details. In other instances detailed descriptions of well-known devices, circuit, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
FIG. 1 depicts a high level diagram of a telecommunications network in which a preferred embodiment of the present invention may be implemented, wherein a neighbor-cell is to be considered for removal. Included in the network, though not shown, is an operational support system (OSS) that is a set of programs to provide, among other functions, control and analyzing functions. The OSS creates commands to act (remove or add) on target cells in a mobile service center (MSC). Network 100 includes Mobile Station (MS) 102 that is in communication with service cell 104. Network 100 includes Neighbor-cells (Ncell) N1, N2, and N3. As one skilled in the art might conclude, there are more than three neighbor-cells in a typical wireless network. FIG. 1 is limited to three Ncells to simplify explanation and illustration of the present invention. Table 112 comprises measurements that are collected in cellular systems. The present invention optimizes a neighbor list for a particular cell in a cellular telecommunications network by automatically removing unnecessary cells and adding necessary neighbor-cells to the cell's neighbor list when warranted. Generally, measurements are stored and available in an MSC to use in determining the necessity for removing or adding a particular cell in a neighbor list.
High-level block diagram 110 depicts gathering statistics related to handoff attempts (MAHO data) at individual cells, and the number of times a neighbor-cell is determined to be a best candidate (BestCand data). The variable x in diagram 110 represents MAHO data and the variable y represents BestCand data. Each neighbor-cell (Ncell(1), Ncell(2), . . . Ncell(n)) provides x and y values for the neighbor list of cell i (in this example, cell A equates to service cell 104).