Physical broadcast channel (PBCH) and master information block (MIB) design

1. A method for wireless communications by a user equipment (UE) in a wireless network, comprising:

transmitting information in at least a narrowband region of a system bandwidth;

receiving, a first number of symbols within a first subframe on a physical channel;

determining a number of blind decodes to perform on the first number of symbols based on at least a complexity of the UE, wherein the determined number of blind decodes comprises:

a first number of blind decodes when the complexity of the UE is a low complexity;

a second number of blind decodes when the complexity of the UE is a medium complexity; and

a third number of blind decodes when the complexity of the UE is high complexity, wherein:

the first number of blind decodes is less than the second number of blind decodes and the third number of blind decodes; and

the second number of blind decodes is less than the third number of blind decodes;

performing the determined number of blind decodes on the first number of symbols to Obtain a first set of bits;

performing one or more cyclic shifts on the first set of bits;

calculating a redundancy check value for the cyclically-shifted first set of bits, wherein a redundancy check ordering is reversed and calculating the redundancy check value is performed from a least significant bit to most significant bit; and

decoding an information block based on whether the redundancy check value passes.

2. The method of claim 1 , wherein performing the determined number of blind decodes comprises de-scrambling, de-interleaving and de-rate matching the first number of symbols.

3. The method of claim 1 , wherein the receiving comprises receiving within a narrowband region of wider system bandwidth.

4. The method of claim 1 , wherein the first number of symbols are obtained from a tail-biting convolutional code (TBCC).

5. The method of claim 1 , further comprising:

receiving a second number of symbols within a second subframe on the physical channel;

obtaining a second set of bits from the second number of symbols; and

performing one or more cyclic shifts on the second set of bits.

6. The method of claim 5 , wherein the second set of bits comprise a number of bits cyclically shifted based on the first set of bits, and combining the first number of symbols with the second number of symbols, wherein the combining comprises:

calculating a first set of log likelihood ratios (LLRs) from the first number of symbols;

calculating a second set of LLRs from the second number of symbols;

calculating a third set of LLRs by applying a cyclic shift to the second set of LLRs; and

combining the first set of LLRs and the third set of LLRs.

7. The method of claim 5 , wherein the second number of symbols include a second payload different from a first payload of the first number of symbols; and

combining the second number of symbols with the first number of symbols.

8. The method of claim 1 , wherein the receiving comprising:

receiving a signal having an indication of one or more deployment configurations; and

selecting a transmission configuration from a set of predetermined transmission configurations, based on the indication of the deployment configuration.

9. The method of claim 8 , wherein the predetermined transmission configuration comprises at least one of: a resource element mapping, a payload size, a payload interpretation, a number of repetitions, a scrambling sequence, and a time during which a payload may remain unchanged, or wherein the deployment configuration comprises one of: a one or more narrowband regions of a wider system bandwidth, or a standalone deployment.

10. The method of claim 8 , wherein receiving the signal further comprises blindly decoding or detecting a signal for each of the deployment configurations.

11. The method of claim 1 , wherein the higher the complexity of the UE, the greater the number of blind decodes.

12. The method of claim 1 , wherein the determined number of blind decodes to perform comprises one of:

one blind decode when the complexity of the UE is low;

two blind decodes when the complexity of the UE is medium; and

four blind decodes when the complexity of the UE is high.

13. The method of claim 1 , wherein performing the one or more cyclic shifts on the first set of bits comprises

applying a null shift to an initial transmission at a beginning of a physical broadcast channel (PBCH) update cycle.

14. An apparatus for wireless communications by a user equipment (UE) in a wireless network, comprising:

at least one processor configured to:

transmit information in at least a narrowband region of a system bandwidth;

receive a first number of symbols within a first subframe on a physical channel;

determine a number of blind decodes to perform on the first number of symbols based on at least complexity of the apparatus, wherein the determined number of blind decodes comorises:

a first number of blind decodes when Ike complexity of the UE is a low complexity;

a second number of blind decodes when the complexity of the UE is a medium complexity; and

a third number of blind decodes when the complexity of the UE is high complexity, wherein:

the first number of blind decodes is less than the second number of blind decodes and the third number of blind decodes; and

the second number of blind decodes is less than the third number of blind decodes:

perform the determined number of blind decodes on the first number of symbols to obtain a first set of bits;

perform one or more cyclic shifts on the first set of bits;

calculate a redundancy check value for the cyclically-shifted first set of bits, wherein a redundancy check ordering is reversed and calculating the redundancy check value is performed from a least significant bit to most significant bit; and

decode an information block based on whether the redundancy check value passes; and

a memory coupled to the at least one processor.

15. The apparatus of claim 14 , wherein the receiving comprises:

receiving a signal having an indication of a deployment configuration; and

selecting a transmission configuration from a set of predetermined transmission configurations, based on the indication of the deployment configuration.

16. An apparatus for wireless communications by a uses equipment (UE) in a wireless network, comprising:

means for transmitting information in at least a narrowband region of a system bandwidth:

means for receiving, a first number of symbols within a first subframe on a physical channel;

means for determining a number of blind decodes to perform on the first number of symbols based on a complexity of the UE, wherein the determined number of blind decodes comprises:

a first number of blind decodes when the complexity of the UE is a low complexity;

a second number of blind decodes when the complexity of the UE is a medium complexity; and

a third number of blind decoder when the complexity of the UE is high complexity, wherein:

the first number of blind decodes is less than the second number of blind decodes and the third number of blind decodes; and

the second number of blind decodes is less than the third number of blind decodes:

means for performing the determined number of blind decodes on the first number of symbols to obtain a first set of bits;

means for performing one or more cyclic shifts on the first set of bits;

means for calculating a redundancy Check value for the cyclically-shifted first set of bits,

wherein a redundancy check ordering is reversed and calculating the redundancy check value is performed from a least significant bit to most significant bit; and

means for decoding an information block based on whether the redundancy check value passes.

17. A non-transitory computer-readable medium for wireless communications by a user equipment (UE) in a wireless network, comprising:

instructions that, when executed by at least one processor, cause the at least one processor to:

transmit information in at least a narrowband region of a system bandwidth;

receive a first number of symbols within a first subframe on a physical channel;

determine a number of blind decodes to perform on the first number of symbols based on a complexity of the UE, wherein the determined number of blind decodes comprises:

a first number of blind decodes when the complexity of the UE is a low complexity;

a second number of blind decodes when the complexity of the UE is a medium complexity; and

a third number of blind decodes when the complexity of the UE is high complexity, wherein:

the first number of blind decodes is less than the second number of blind decodes and the third number of blind decodes; and

the second number of blind decodes is less than the third number of blind decodes:

perform the determined number of blind decodes on the first number of symbols to obtain a first set of bits;

perform one or more cyclic shifts on the first set of bits;

calculate a redundancy check value for the cyclically-shifted first set of bits, wherein a redundancy check ordering is reversed and calculating the redundancy check value is performed from a least significant bit to most significant bit; and

decode an information block based on whether the redundancy check value passes.