Almost-blank subframe configuration detection in heterogeneous networks

摘要

A method for detecting an Almost-Blank Subframe (ABS) configuration for an interfering macro cell of a heterogeneous network is implemented in a wireless terminal. For one or more resource blocks in a received signal, a first power metric is calculated as a function of channel response estimates determined for predicted cell-specific (or common) reference signal (CRS) resource element locations in a plurality of symbols. For the one or more resource blocks in the received signal, a second power metric is calculated as a function of channel response estimates determined for the predicted CRS resource element locations in a single one of the plurality of symbols. A difference between the first and second power metrics is compared to a threshold, and responsive to the comparison a determination is made as to whether the macro cell is operating in a Multicast and Broadcast Single Frequency Network (MBSFN) mode or a non-MBSFN mode.

主权项

1. A method for detecting an Almost-Blank Subframe (ABS) configuration for an interfering macro cell of a heterogeneous network, the method being implemented in a wireless terminal and comprising:
for one or more resource blocks in a received signal that is received from a cell in the heterogeneous network that is not the interfering macro cell, calculating a first power metric as a function of channel response estimates determined for predicted common reference signal (CRS) resource element locations in a plurality of symbols; for the one or more resource blocks in the received signal, calculating a second power metric as a function of channel response estimates determined for the predicted CRS resource element locations in a single one of the plurality of symbols; comparing a difference between the first and second power metrics to a threshold; and determining whether the interfering macro cell is operating in a Multicast and Broadcast Single Frequency Network (MBSFN) mode or a non-MBSFN mode based on the comparison, wherein the MBSFN mode corresponds to the difference being greater than or equal to the threshold, and the non-MBSFN mode corresponds to the difference being less than the threshold.