2.The Methods
(6) Hierarchical transmission and partial reception

・ In the triple-segment transmission, both one layer transmission and hierarchical transmission can be achieved. There are two layers of A and B in the hierarchical transmission.
The transmission parameters of carrier modulation scheme, coding rates of the inner code and a length of the time interleaving can be changed in the different layers.

・ The centre segment of hierarchical transmission is able to be received by single-segment receiver. Owing to the common structure of OFDM segment, single-segment receiver can partially receive a centre segment of full-band ISDB-T signal whenever an independent program is transmitted in the centre segment.

Figure 2 shows an example of hierarchical transmission and partial reception. In Japan, hierarchical transmission mode has to be used in the case of triple-segment transmission.

FIGURE 2 Example diagram of hierarchical transmissiFon and partial reception