2016/09 43 p.
With the wider usage of mobile applications like social networking and point-to-point video/file sharing, uplink traffic
load is becoming much heavier, and LTE uplink spectral efficiency improvement tends to be an essential and practical
requirement for operators.
In typical LTE homogenous network, frequency reuse factor of one is utilized, and inter-cell interference has a
substantial impact on uplink performance. For heterogeneous network with co-channel deployment of macro and low
power base stations (BSs), the interference is even stronger due to a large number of low power BSs deployed. In both
cases, BS MMSE-IRC (Minimum mean square error - interference rejection combining) receiver is considered as a
promising approach for spatial domain interference handling. The MMSE-IRC receiver can suppress inter-cell
interference as well as intra-cell interference, and thus achieve cell-edge and cell-average spectral efficiency gain over
MMSE receiver. Moreover, the implementation complexity increase is moderate, since this kind of baseband processing
technique is relatively mature nowadays.
To verify BS receiver's ability of inter-cell interference suppression, a new work item on "Performance requirements of
MMSE-IRC receiver for LTE BS" was approved at RAN #66 , and the present document summarizes the work done
under this work item.