Power allocation method for multicast services
View Patent ↗In a mobile telecommunication system ( 10 ), a number of user equipments ( 40–45 ) may receive multimedia broadcast multicast services. The method for power allocation and user assignment for MBMS services determines any number (K) of user equipments which may be served without complete cell area coverage ( 78 ). For more than K user equipments ( 40–45 ) requesting MBMS services, dedicated channels are assigned ( 84 ). For user equipments requesting MBMS service during a broadcast, such user equipment is assigned to the channel (broadcast or dedicated) with the lower power requirement, if power is available. If the user is assigned to the broadcast channel, and power is available, power of the broadcast channel is adjusted ( 108 ). Otherwise, the power of the broadcast channel is increased and no further power is indicated as being available ( 112 ).
1. A power allocation and user assignment method for multimedia broadcast multicast services (MBMS services) in a mobile communication system, the power allocation and user assignment method comprising the steps of:
transmitting a pilot signal to a plurality of user equipments;
collecting by a radio network controller (RNC) of the mobile communication system a signal/noise ratio (S/N) of the pilot signal as received by the plurality of user equipments; sorting by the RNC the plurality of user equipments by the strength of the S/N of the pilot signal from a strongest pilot signal to a weakest pilot signal;
determining a number (K) of a particular user equipment of the plurality of user equipments to support on a broadcast channel;
determining by the RNC a coverage area within the cell for the MBMS services; and
assigning a portion of the plurality of user equipments, one through K, to the broadcast channel, wherein the step of determining the number K includes a step of:
K
=
arg
k
max
(
P
B
(
N
UE
)
-
P
B
(
k
)
-
(
∑
i
=
k
+
1
N
UE
P
i
)
)
wherein P B (k) is the required power allocation of the broadcast channel to support user k, P B (N UE ) is the total power allocation required to cover all users using the broadcast channel and P i is the required power to support user i using a dedicated channel.
2. A power allocation and user assignment method for multimedia broadcast multicast services (MBMS services) in a mobile communication system, the power allocation and user assignment method comprising the steps of:
transmitting a pilot signal to a plurality of user equipments;
sorting each of the plurality of user equipments by a strength of the pilot signal;
determining a number (K) of a particular user equipment of the plurality of user equipments to support on a broadcast channel; and
assigning a portion of the plurality of user equipments, one through K, to the broadcast channel, wherein the step of determining the number K includes a step of:
K
=
arg
k
max
(
P
B
(
N
UE
)
-
P
B
(
k
)
-
(
∑
i
=
k
+
1
N
UE
P
i
)
)
wherein P B (k) is the required power allocation of the broadcast channel to support user k, P B (N UE )is the total power allocation required to cover all users using the broadcast channel and P i is the required power to support user i using a dedicated channel.