Method and apparatus for power headroom reporting during multi-carrier operation
First Claim
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1. A method in a wireless communication base station that supports aggregated carrier access by a mobile station, the method comprising:
- configuring, with the base station, a mobile station to operate a first uplink carrier as a primary uplink carrier;
receiving, from the mobile station, a power headroom report of a first type for a second uplink carrier when the wireless communication device is not configured to transmit an uplink control channel on the second uplink carrier, the first type power headroom report being based on transmission of an uplink shared channel;
receiving a power headroom report of a second type for the second uplink carrier;
the power headroom of the second type being based on an estimated transmit power of a virtual uplink control channel and an estimated transmit power of the uplink shared channel, the virtual uplink control channel representing a virtual resource allocation;
calculating a difference between the power headroom report of the first type and the power headroom report of the second type;
determining, based on the calculation, whether the second uplink carrier can support transmission of the uplink control channel and the uplink shared channel in a same transmission time interval; and
configuring, with the base station, in response to the determining, the mobile station to operate the second uplink carrier as the primary uplink carrier.
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Abstract
A method in a wireless communication terminal supports aggregated carrier access. The terminal is configured to transmit a power headroom report of a first type, determine that a condition for transmission of a power headroom report of a second type is satisfied, and transmits a power headroom report of the second type. In other embodiments, essential power headroom reports are prioritized over non-essential power headroom reports.
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Citations
11 Claims
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1. A method in a wireless communication base station that supports aggregated carrier access by a mobile station, the method comprising:
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configuring, with the base station, a mobile station to operate a first uplink carrier as a primary uplink carrier; receiving, from the mobile station, a power headroom report of a first type for a second uplink carrier when the wireless communication device is not configured to transmit an uplink control channel on the second uplink carrier, the first type power headroom report being based on transmission of an uplink shared channel; receiving a power headroom report of a second type for the second uplink carrier;
the power headroom of the second type being based on an estimated transmit power of a virtual uplink control channel and an estimated transmit power of the uplink shared channel, the virtual uplink control channel representing a virtual resource allocation;calculating a difference between the power headroom report of the first type and the power headroom report of the second type; determining, based on the calculation, whether the second uplink carrier can support transmission of the uplink control channel and the uplink shared channel in a same transmission time interval; and configuring, with the base station, in response to the determining, the mobile station to operate the second uplink carrier as the primary uplink carrier. - View Dependent Claims (2, 3, 4)
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5. A method in a wireless communication device that supports aggregated carrier access, the method comprising:
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determining that a first condition for transmitting a power headroom report is satisfied, the first condition including elapse of a specified time since a previous transmission of a power headroom report; scheduling a first power headroom report for transmission during a first time period when the first condition is satisfied; determining whether a second condition for transmitting a second power headroom report of a second uplink carrier is satisfied in addition to the first condition being satisfied, the second condition comprising determining that a resource allocation for reception of data on the downlink carrier paired to the second uplink carrier has been received within another elapsed time period; and scheduling, if the second condition for transmitting of the second power headroom report is satisfied in addition to the first condition being satisfied, a second power headroom report for transmission during the first time period. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification