A method for performing a time measurement on a packet flow to be transmitted from a first node to a second node of a communication network, said packet flow being divided, upon its transmission, in first packets transmitted during first block periods and second packets transmitted during second block periods, said first block periods alternating in time with said second block periods, said packet flow comprising at least two packets (Pki) transmitted by said first node during a block period (T(k)), with k=0, 1, 2, 3, etc., amongst said first block periods or said second block periods, said method comprising: a) calculating a medium transmission time parameter (TSM1(k)) for each block period (T(k)), indicative of an average of at least two transmission time parameters (TS1(i, k)) relating to said at least two packets (Pki), wherein said medium transmission time parameter (TSM1(k)) comprises a medium transmission timestamp (TSM1(k)) calculated as an average of at least two transmission timestamps (TS1(i, k)) generated upon transmission of said at least two packets (Pki); b) calculating a medium reception time parameter (TSM2(k)) for each block period (T(k)), indicative of an average of at least two reception time parameters (TS2(i, k)) relating to said at least two packets (Pki), wherein said medium reception time parameter (TSM2(k)) comprises a medium reception timestamp (TSM2(k)) calculated as an average of at least two reception timestamps (TS2(i, k)) generated upon reception of said at least two packets (Pki); and c) calculating a medium time measurement (DM(k)) for each block period (T(k)), indicative of an average performance of said packet flow during said block period (T(k)) using said medium transmission time parameter (TSM1(k)) and said medium reception time parameter (TSM2(k)), wherein said medium time measurement (DM(k)) comprises a medium delay (DM(k)) calculated as a difference between said medium reception timestamp (TSM2(k)) and said medium transmission timestamp (TSM1(k)). a) calculating a medium transmission time parameter (TSM1(k)) for each block period (T(k)), indicative of an average of at least two transmission time parameters (TS1(i, k)) relating to said at least two packets (Pki), wherein said medium transmission time parameter (TSM1(k)) comprises a medium transmission timestamp (TSM1(k)) calculated as an average of at least two transmission timestamps (TS1(i, k)) generated upon transmission of said at least two packets (Pki); b) calculating a medium reception time parameter (TSM2(k)) for each block period (T(k)), indicative of an average of at least two reception time parameters (TS2(i, k)) relating to said at least two packets (Pki), wherein said medium reception time parameter (TSM2(k)) comprises a medium reception timestamp (TSM2(k)) calculated as an average of at least two reception timestamps (TS2(i, k)) generated upon reception of said at least two packets (Pki); and c) calculating a medium time measurement (DM(k)) for each block period (T(k)), indicative of an average performance of said packet flow during said block period (T(k)) using said medium transmission time parameter (TSM1(k)) and said medium reception time parameter (TSM2(k)), wherein said medium time measurement (DM(k)) comprises a medium delay (DM(k)) calculated as a difference between said medium reception timestamp (TSM2(k)) and said medium transmission timestamp (TSM1(k)).