Method and Apparatus For Transmitting Data
An apparatus, comprises an interface ( 113 ) receiving first data scheduled for a first set of channels by a remote scheduler ( 107 ). A local scheduler ( 111 ) allocates data for a second set of channels in response to a power usage assumption of the power used by the remote scheduler ( 107 ). A transmit power processor ( 117 ) determines a transmit power associated with the first data in a first time interval of a scheduling time interval of the local scheduler ( 111 ) and a power limiter ( 119 ) is arranged to limit a transmit power level of the first data in the scheduling time interval in response to the determined power resource. The resulting signal is transmitted to user equipment ( 123 ) by a transceiver ( 121 ). The invention may be particularly suitable for a 3 rd generation cellular communication system supporting High Speed Downlink Packet Access (HSDPA) services.
1 . An apparatus comprising:
means for receiving first data scheduled for a first set of channels by a remote scheduler
a local scheduler arranged to allocate data for a second set of channels in response to a power usage assumption of the power used by the data scheduled by the remote scheduler;
means for transmitting the first data in the first set of channels and the second data in the second set of channels;
means for determining a transmit power associated with the first data in a first time interval of a scheduling time interval of the local scheduler;
means for limiting a transmit power level of the first data in the scheduling time interval in response to the determined transmit power.
2 . The apparatus claimed in claim 1 wherein the first time interval of the resource time interval has a duration substantially identical to a power control time interval duration.
3 . The apparatus claimed in claim 1 wherein the means for determining the transmit power is arranged to determine the transmit power associated with the first data by determining a total transmit power of a transmitted signal and subtracting a transmit power level associated with the second set of channels.
4 . The apparatus claimed in claim 1 wherein the means for limiting is arranged to limit the transmit power level if the transmit power exceeds one of the group of the power usage assumption and a power threshold.
5 . The apparatus claimed in claim 1 wherein the means for limiting the transmit power level is arranged to further limit the transmit power level of the first data in response to a power resource associated with the local scheduler.
6 . The apparatus claimed in claim 1 wherein the means for limiting is arranged to limit the transmit power if the transmit power is in a non-linear region of a power amplifier of the means for transmitting.
7 . The apparatus claimed in claim 1 wherein the means for limiting is arranged to reduce a gain of a transmit path associated only with the first set of channels.
8 . The apparatus claimed in claim 1 wherein the means for limiting is arranged to ignore at least some power up commands.
9 . The apparatus claimed in claim 1 wherein the apparatus further comprises means for determining the power usage assumption in response to a previous power usage of the remote scheduler.
10 . A method of transmitting data comprising:
receiving first data scheduled for a first set of channels by a remote scheduler,
scheduling data for a second set of channels in response to a power usage assumption of the power used by the data scheduled by the remote scheduler;
transmitting the first data in the first set of channels and the second data in the second set of channels;
determining a transmit power associated with the first data in a first time interval of a scheduling time interval associated with the second channels; and
limiting a transmit power level of the first data in response to the determined transmit power.