With the wider usage of mobile applications like cloud services, social networking and point to point video/file sharing, uplink traffic load is becoming much heavier, and LTE uplink throughput improvement tends to be an essential and practical requirement for operators.
LTE uplink is interference limited in typical networks, and co-channel interference has substantial impact on uplink cell average and cell edge throughput. Base station (BS) MMSE-IRC receiver can bring in significant SINR gain over MMSE receiver by suppressing the inter-cell interference, in both homogeneous and heterogeneous networks, as concluded in TR 36.884
. The RAN4 demodulation performance requirements for BS MMSE-IRC receiver are completed at RAN #72 meeting in June 2016.
Further evolution of BS receiver, such as interference cancellation (IC) receiver, can be considered to mitigate the intra-cell inter-user interference. In the intra-cell inter-user interference scenario where multiple users are co-scheduled on the same resource elements, BS IC receiver is expected to achieve noticeable throughput gain for cell centre and cell edge users.
Note that the utilization of BS IC receiver is transparent to the users, and the performance gain of BS IC receiver can also be enjoyed by legacy users.
To study the performance benefits of BS IC receiver, a new study item "Study on interference cancellation receiver for LTE BS" was approved at RAN #73, and the current document summarizes the study done under this study item.