Inter-System Interference in Communications

摘要

An inter-system interference estimation method is disclosed for both primary and secondary radio systems. In the case of a primary system (such as a GSM system), inter-system interference estimation is based on a comparison of cell level measurement statistics before and after secondary spectrum usage in neighbouring cells. In the case of a secondary system (such as an LTE system), inter-system interference estimation is based on a measurement on secondary spectrum before starting transmission on the secondary spectrum. Based on both of the above mentioned inter-system inter-cell interference estimations, a cell-level decision on the secondary spectrum usage is made, and optimization of radio resource allocation inside the systems may be carried out.

主权项

1. A method comprising
obtaining, in a network apparatus, information on a reference interference level value defined for a first cell utilizing a primary radio access technology, the reference level interference value for the first cell indicating incoming interference to the first cell by a secondary radio access technology; obtaining, in the network apparatus, information on an estimated emitted transmission power value measured for at least one second cell utilizing the secondary radio access technology; obtaining, in the network apparatus, information on an estimated inter-system interference value defined for the first cell, wherein the estimated inter-system interference value defined for the first cell is calculated by comparing the reference level interference value defined for the first cell to an interference level value defined for the first cell when the secondary radio access technology is using the shared radio spectrum block; controlling, in the network apparatus, the usage of the shared radio spectrum in the second cell based on the estimated emitted power value measured for a second cell and the estimated inter-system interference value defined for the first cell, wherein the shared radio spectrum usage in the second cell is controlled by
allowing the usage of the shared spectrum for the secondary radio access technology in the second cell, and, optionally, defining a maximum allowed transmission power for the secondary radio access technology transmission on the shared radio spectrum in the second cell, orpreventing the usage of the shared spectrum for the secondary radio access technology in the second cell.