Determining Root Sequence

A method, executed in a root sequence determiner for a base station controlling a first cell, the first cell associated with at least one root sequence used for cell differentiation on a random access channel, the method comprising:

• obtaining information on root sequences of neighboring cells, the neighboring cells neighboring the first cell;
• in response to finding a root sequence conflict between the first cell and a neighboring cell, the neighboring cell having the root sequence conflict denoted as a conflict cell, determining if the conflict cell is of a higher priority than the first cell, the priorities of the first cell and the conflict cell being based on properties of the respective cells;
• in response to the conflict cell being of a higher priority than the first cell, finding a new root sequence for the first cell that avoids any root sequences of the neighboring cells.

A computer program product stored in a non-transitory computer readable medium for determining a root sequence in a root sequence determiner for a base station controlling a first cell, the first cell associated with at least one root sequence used for cell differentiation on a random access channel, the computer program product comprising software instructions which, when run on one or more processing circuits of the root sequence determiner, causes the root sequence determiner to:

• obtain information on root sequences with neighboring cells, the neighboring cells neighboring the first cell;
• in response to finding a root sequence conflict between the first cell and a neighboring cell, the neighboring cell having the root sequence conflict denoted as a conflict cell, determine if the conflict cell is of a higher priority than the first cell, the priorities of the first cell and the conflict cell being based on properties of the respective cells;
• in response to the conflict cell being of a higher priority than the first cell, find a new root sequence for the first cell that avoids any root sequences of the neighboring cells.