Broadcast signal frame generation apparatus and broadcast signal frame generation method using layered division multiplexing

1. An apparatus for generating broadcast signal frame, comprising:

a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhanced layer signal at different power levels;

a power normalizer configured to reduce power of the multiplexed signal to a power level corresponding to the core layer signal;

a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and

a frame builder configured to generate a broadcast signal frame including a preamble for signaling, type information of Physical Layer Pipes (PLPs) and time interleaver information shared by the core layer signal and the enhanced layer signal,

wherein the frame builder includes

a bootstrap generator configured to generate a bootstrap,

a preamble generator configured to generate the preamble, and

a payload generator configured to generate a payload corresponding to the time-interleaved signal, and

wherein the type information is for identifying one among a first type corresponding to a non-dispersed Physical Layer Pipe and a second type corresponding to a dispersed Physical Layer Pipe.

2. The apparatus of claim 1 , wherein the non-dispersed Physical Layer Pipe is assigned to contiguous data cell indices, and the dispersed Physical Layer Pipe includes two or more subslices.

3. The apparatus of claim 2 , wherein the type information is selectively signaled based on a result of comparing layer identification information with a predetermined value for each of the Physical Layer Pipes (PLPs).

4. The apparatus of claim 3 , wherein the type information is signaled only for a core layer.