Licensed assist access (LAA) in unlicensed spectrum using the Carrier Aggregation Framework of LTE was introduced in Rel-13 as a complementary tool to augment operators' service offering and solutions. Given the widespread deployment and usage of other technologies in unlicensed spectrum, it is necessary that LAA coexists with existing and future technologies targeted for unlicensed spectrum. Therefore, LBT mechanism was introduced for LAA to coexist with other wireless systems, e.g. IEEE 802.11 as well as with other LAA systems. As part of the R13 WI, functionality tests for LBT mechanism have been specified for LAA to verify that the LAA Base Stations (BS) have implemented LBT as it is specified in 3GPP specifications. Meanwhile, there has been request to conduct multi-node tests where two wireless systems share the same unlicensed spectrum and their system performance is to be ensured, e.g. between two LAA systems or between LAA and other wireless systems, e.g. IEEE 802.11. Such multi-node tests are expected to verify that the two systems can coexist when operating in the same unlicensed spectrum. From this perspective, multi-node tests verify coexistence at system level, while it is understood that any LBT functionality verifications of LAA BS are already guaranteed by LBT tests introduced in Rel-13 LAA.

The present document describes the multi-node tests for Rel-13 LAA BSs and other wireless systems operating in unlicensed spectrum. In particular, the report documents how to conduct multi-node tests involving two Rel-13 LAA BSs or one Rel-13 LAA BS and one other wireless system, e.g. IEEE 802.11 system to make sure that the two systems can coexist in the same unlicensed spectrum. This document aims to provide an evaluation methodology for multi-node coexistence between Rel-13 LAA BSs and other wireless systems.