Patent Document ID: 9893762
Application ID: 15509210
Patent Flag: 1

Claim One:
1. A method, performed by a Vectoring Control Entity (VCE), for handling Disorderly Leaving Event (DLE) causing Sudden Termination Change (STC) in a Digital Subscriber Line (DSL) system, the method comprising: when a DLE occurs on a line m in a vectored group of DSL lines, and the transmission on line m is at least partly continued: obtaining at least one error sample from Customer Premises Equipments (CPEs) connected to other lines in the vectored group of DSL lines; calculating an estimate of the channel coefficients (H′) changed due to the DLE based on the at least one error sample, thereby providing a channel estimate; and modifying a downstream precoder, based on the channel estimate, such that retraining of the other lines in the vectored group due to the DLE is avoided; wherein the estimate of the channel coefficients is calculated based on the model H′=H+CΛH, where: C is a near-end crosstalk coupling matrix for the CPE end of the vectored group; Λ is a diagonal matrix with reflection coefficients, after the DLE, of the CPE-end of cables associated with the vectored group; H is a matrix with the channel coefficients before the DLE; and H′ is a matrix with the estimated channel coefficients after the DLE.