Method for reducing intra-cell interference between cell phones performing random access
First Claim
1. A method in a network node in control of a cell in a cellular telecommunication network for reducing intra-cell interference between user equipments (UE) residing in said cell and performing random access (RA) on a Random Access Channel (RACH), comprising the steps ofarranging groups of preamble sequences where the sequences within each group are orthogonal to each other, while sequences belonging to different groups are not orthogonal to each other;
- assigning one such group to the cell, from which group the UEs performing RA randomly selects a preamble, andassigning one or more additional group(s) of preamble sequences to said cell if the RACH or traffic load exceeds a certain threshold.
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Abstract
A method in a network node in control of a cell in a cellular telecommunication network for reducing intra-cell interference between user equipments (UE) residing in said cell and performing random access (RA). The method comprises the steps of arranging groups of preamble sequences where the sequences within each group are orthogonal to each other, assigning one such group to the cell, from which group the UEs performing RA randomly selects a preamble, and assigning one or more additional group(s) of preamble sequences to said cell if the RACH or traffic load exceeds a certain threshold. The invention further relates to a radio network node in a cellular telecommunication system, capable of carrying out said method.
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Citations
15 Claims
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1. A method in a network node in control of a cell in a cellular telecommunication network for reducing intra-cell interference between user equipments (UE) residing in said cell and performing random access (RA) on a Random Access Channel (RACH), comprising the steps of
arranging groups of preamble sequences where the sequences within each group are orthogonal to each other, while sequences belonging to different groups are not orthogonal to each other; -
assigning one such group to the cell, from which group the UEs performing RA randomly selects a preamble, and assigning one or more additional group(s) of preamble sequences to said cell if the RACH or traffic load exceeds a certain threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A radio network node in a cellular telecommunication system, comprising:
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means for arranging groups of preamble sequences where the sequences within each group are orthogonal to each other, while sequences belonging to different groups are not orthogonal to each other; means for assigning one or more such groups to the cell that the radio network node is in control of; and means for receiving a load estimation input and for making a decision on assignment of one or more additional group(s) to the cell based on said input. - View Dependent Claims (15)
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Specification