Handover in cellular system utilising narrow and wide beam antennas
First Claim
1. Method for operating a cellular radio system having a base station comprising at least one antenna with a wide area beam and at least one antenna with a narrow beam, whereby only a limited number of narrow beam channels (p) are available on the at least one narrow beam antenna, the base-station being adapted to assign the narrow beam channels to a number of mobile terminals (t, n, N), the method comprising the steps of determining the expected duty cycle values (α
- , β
) on the up- and downlink channel, respectively, for each mobile terminal, determining possible combinations (x) of assigning mobile terminals (t) to the available channels (p), for each possible combination (x) calculating the total power emission value (P_sum(x)) from the power emission values of the base-station (P_B(x)) and the assigned mobile terminals (P_t(x)), respectively, scaling the respective power emission values by the duty cycle (α
, β
) in question, selecting a channel assignment combination (x) based on the total power emission value calculation, performing channel assignment in accordance with the selected combination.
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Accused Products
Abstract
The invention concerns a method for operating a cellular radio system having a base station comprising at least one antenna with a wide area beam and at least one antenna with a narrow area beam whereby only a limited number of channels (p) are available on the at least one narrow beam antenna. According to the invention, a number of narrow beam channels are assigned to a number of mobile terminals (t, n, N) according to estimated duty cycle values (α, β) on the up- and downlink channel for the respective mobile terminals in order to minimise interferences in the cellular system.
17 Citations
9 Claims
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1. Method for operating a cellular radio system having a base station comprising at least one antenna with a wide area beam and at least one antenna with a narrow beam, whereby only a limited number of narrow beam channels (p) are available on the at least one narrow beam antenna, the base-station being adapted to assign the narrow beam channels to a number of mobile terminals (t, n, N), the method comprising the steps of
determining the expected duty cycle values (α - , β
) on the up- and downlink channel, respectively, for each mobile terminal,determining possible combinations (x) of assigning mobile terminals (t) to the available channels (p), for each possible combination (x) calculating the total power emission value (P_sum(x)) from the power emission values of the base-station (P_B(x)) and the assigned mobile terminals (P_t(x)), respectively, scaling the respective power emission values by the duty cycle (α
, β
) in question,selecting a channel assignment combination (x) based on the total power emission value calculation, performing channel assignment in accordance with the selected combination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- , β
Specification