Method and apparatus for determining transmission power of a secondary transmitter in a hierarchical spectrum sharing system

摘要

The present invention provides a method and apparatus for determining a transmission power of a secondary transmitter in a hierarchical spectrum sharing system. The method can comprise steps of obtaining channel quality information on a primary link from at least one primary receiver within a transmission range of the secondary transmitter; and determining the transmission power for the secondary transmitter based on the channel quality information, wherein the transmission power is matched with the channel quality indicated by the channel quality information. According to the embodiments of the present invention, a power control scheme is applied to the secondary transmitter based on the channel quality information on the primary link. In such a way, the secondary transmitter' throughput can be improved with controllable rate loss to the primary receiver and accordingly the spectrum efficiency for the whole system can be further upgraded.

主权项

1. A method for determining a transmission power of a secondary device in a hierarchical spectrum sharing system, comprising:
obtaining Channel Quality Indicator (CQI) by the secondary device, on a primary link from a primary device within a transmission range of the secondary device; and
determining the transmission power for the secondary device based on the CQI, wherein the transmission power is matched with the channel quality indicated by the CQI, wherein determining the transmission power for the secondary device based on the CQI comprising:
determining the transmission power based on the CQI so that the secondary device's throughput is optimized with a tolerable rate loss to the primary device, andselecting the transmission power corresponding to a channel quality indicator index indicated by the CQI from a predetermined power control codebook in which each transmission power corresponding to each channel quality indicator index could ensure that the secondary device's throughput is maximized with the tolerable rate loss to the primary device.