It is disclosed a method including transmitting indication information indicating network cells of a first type different from network cells of a second type, the transmitting including a) broadcasting control information, the indication information to be transmitted being an indication flag, b) assigning a set of synchronization information to the network cells of the first type, and broadcasting control information, the indication information to be transmitted being the synchronization information, c) reserving at least one signaling code information for the network cells of the first type, the indication information to be transmitted being the signaling code information, d) transmitting signaling information subjected to modulation by at least one predefined phase modulation or scrambling by at least one predefined scrambling sequence, the modulation or scrambling being indicative of network cells of the first and second types, and/or e) transmitting i) a PSS and a RS, ii) a SSS and a RS, or iii) a PSS and a SSS, the PSS/RS, SSS/RS or PSS/SSS having at least one predefined phase relation to each other, the at least one phase relation being indicative of the network cells of the first and second types.