Efficient broadcast channel in beamformed systems for NR
A method for transmitting system information on a PBCH is described herein. A transmission/reception point (TRP) may generate a concatenated master information block (MIB) transport block that includes information bits associated with system bandwidth information, timing information, system frame number (SFN), a beam sweeping configuration, and a control resource set (CORESET). The TRP may then attach at least 16 cyclic redundancy check (CRC) bits to the concatenated MIB and then prioritize the concatenated MIB and the at least 16 CRC bits based on content. The TRP may then perform channel coding of the prioritized concatenated MIB and the at least 16 CRC bits to produce coded bits using at least one polar encoder with a coding rate that is less than 1/3, perform rate matching via repetition on the coded bits, and then transmit the rate matched, coded bits on the PBCH of a radio frame.
1. A wireless transmit receive unit (WTRU) comprising a processor and a memory configured to:
receive a physical broadcast channel (PBCH) transmission, the PBCH transmission comprising a plurality of rate matched polar encoded bits, each of the plurality of rate matched polar encoded bits being associated with respective bit channels, and each of the respective bit channels being associated with a respective reliability, wherein bits are provided to the respective bit channels based on the respective reliability; and
decode the plurality of polar encoded bits to obtain decoded bits, wherein the decoded bits comprise a master information block (MIB), cyclic redundancy check (CRC) bits, one or more bits indicating timing information, and one or more bits indicating a system frame number (SFN).
2. The WTRU of claim 1 , wherein the decoded bits further comprise one or more bits associated with a synchronization signal (SS) block index.
3. The WTRU of claim 1 , wherein the decoded bits further comprise one or more bits associated with control resource set information.
4. The WTRU of claim 1 , wherein each of the plurality of rate matched polar encoded bits is associated with the respective bit channel based on the respective reliability.
5. The WTRU of claim 1 , wherein the decoded bits further comprise one or more associated with beam information.
6. A method implemented by a wireless transmit receive unit (WTRU), the method comprising:
receiving a physical broadcast channel (PBCH) transmission, the PBCH transmission comprising a plurality of rate matched polar encoded bits, each of the plurality of rate matched polar encoded bits being associated with respective bit channels, and each of the respective bit channels being associated with a respective reliability, wherein bits are provided to the respective bit channels based on the respective reliability; and
decoding the plurality of polar encoded bits to obtain decoded bits, wherein the decoded bits comprise a master information block (MIB), cyclic redundancy check (CRC) bits, one or more bits indicating timing information, and one or more bits indicating a system frame number (SFN).
7. The method of claim 6 , wherein the decoded bits further comprise one or more bits associated with a synchronization signal (SS) block index.
8. The method of claim 6 , wherein the decoded bits further comprise one or more bits associated with control resource set information.
9. The method of claim 6 , wherein each of the plurality of rate matched polar encoded bits is associated with the respective bit channel based on the respective reliability.
10. The method of claim 6 , wherein the decoded bits further comprise one or more associated with beam information.