Method and Apparatus for Communication Link Adaptation for Interference-Canceling Receivers

摘要

Network-side and device-side methods and apparatuses improve transmit link adaptation for devices operating in a cellular network that have interference-canceling receivers. Own-cell link adaptation towards a device in a current transmission interval exploits a determined mapping between the interfering-signal cancelation efficiency of the device versus the interfering-signal transport format, in combination with actual knowledge of the transport format that will be used to make an interfering neighbor-cell transmission in the current transmission interval. For example, a serving radio node uses the known transport format of the interfering transmission, to accurately determine the expected cancellation efficiency for the device with respect to the interfering transmission, and uses the expected cancellation efficiency to obtain a more accurate estimate of the own-cell channel quality expected for the device in the current transmission interval. Link adaptation towards the device in the current transmission interval uses this more accurate estimate of own-cell channel quality.

主权项

1. A method of link adaptation toward a wireless device by a serving radio node in a cellular communication network, said method comprising:
determining a mapping between interfering-signal transport formats and corresponding interfering-signal cancelation efficiencies of the device, based on receiving interference-cancelation capability information from the device; receiving an indication of which transport format has been selected for use in a current transmission interval, for a neighbor-cell transmission that is expected to be an interfering transmission with respect to an own-cell transmission to be made by the serving radio node towards the device in the current transmission interval; determining the interference cancelation efficiency expected for the device with respect to the neighbor-cell transmission, as a function of the determined mapping and the transport format known from the received indication; estimating the own-cell signal quality that will be experienced at the device in the current transmission interval, as a function of the determined cancelation efficiency and an own-cell channel quality value indicated by the device in channel quality report received from the device in a prior transmission interval; and selecting the transport format to use for the own-cell transmission as a function of the estimated own-cell quality.