Patent ID: 11894962
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of transmitting an Orthogonal Frequency Division Multiplexing, OFDM, symbol comprising a guard interval including a cyclically repeated part of an original symbol, the method comprising
applying a guard interval for the OFDM symbol, the guard interval comprising a first part, where the first part is a cyclic prefix;
determining whether to use the second part of the guard interval, and when it is determined that the second part of the guard interval is to be used:
including an indication that the applied guard interval comprises a second part, the second part being at least one of a cyclic prefix and a postfix;
applying the second part of the guard interval; and

transmitting the OFDM symbol; and
the determining whether to use the second part of the guard interval comprises:
determining whether coordinated beamforming transmission is performed between neighbouring access points;
estimating impact of transients emanating from changes in the coordinated beamforming; and
determining to apply the second part of the guard interval when estimated impact of transients has a timing within the second part of the guard interval.