Methods for transmitting and storing downlink data, base station, and terminal

A base station comprising:

• a processor;
• a memory storing a program to be executed in the processor, the program comprising instructions for:
• in response to determining that downlink data is broadcast data, performing bit selection according to a soft buffer size Ncb of a code block of the broadcast data, wherein the Ncb is equal to a circular buffer size Kw of the code block, namely, Ncb=Kw;
• and
• a transmitter configured to transmit the broadcast data according to selected bits;
• in response to determining that the downlink data is data that is delivered over a paging channel (PCH) to a physical layer, determining that the downlink data is the broadcast data;
• in response to determining that the downlink data is data that is delivered over a downlink shared channel DL-SCH associated with a random access radio network temporary identifier (RA-RNTI) to the physical layer, determining that the downlink data is the broadcast data;
• and
• in response to determining that the downlink data is data that is delivered over a DL-SCH associated with a system information SI-RNTI to the physical layer, determining that the downlink data is the broadcast data;
• wherein for the DL-SCH associated with the RA-RNTI, over which the downlink data is delivered to the physical layer, a physical downlink shared channel PDSCH to which the DL-SCH is mapped is indicated by a physical downlink control channel (PDCCH) comprising a cyclic redundancy check (CRC) scrambled by the RA-RNTI;
• and
• for the DL-SCH associated with the SI-RNTI, over which the downlink data is delivered to the physical layer, a PDSCH to which the DL-SCH is mapped is indicated by a PDCCH comprising a CRC scrambled by the SI-RNTI.