System information block channel design for enhanced machine type communication with coverage enhancements
Aspects of the present disclosure provided techniques that for wireless communications by a user equipment (UE). An exemplary method, performed by a UE, generally includes determining one or more locations for receiving system information for machine type communication (MTC) over a bundled transmission and decoding the system information received at the locations over the bundled transmission.
1. A method for wireless communications by a user equipment (UE), comprising:
determining one or more locations for receiving a bundled system information block (SIB) transmission for machine type communication (MTC);
receiving an indication in a reserved field of a physical broadcast channel (PBCH) indicating a redundancy version (RV) and a modulation coding scheme (MCS) for the bundled SIB and one or more SIB retransmissions; and
decoding the bundled SIB received at the one or more locations, wherein:
the decoding includes combining SIB retransmissions received over a period using the indicated RV and MCS, and
content of the system information for the SIB retransmissions is fixed over the period.
2. The method of claim 1 , further comprising determining one or more services supported by the UE.
3. The method of claim 2 , wherein the one or more services supported by the UE is dependent, at least in part, on a service bandwidth.
4. The method of claim 2 , wherein the one or more services comprises at least one of: multicast broadcast media service (MBMS) or coverage enhancement.
5. The method of claim 4 , further comprising receiving an MBMS configuration provided to the UE in a broadcast transmission.
6. The method of claim 1 , wherein
an MTC-specific control channel with scheduling information indicating the one or more locations is not received.
7. The method of claim 1 , wherein determining the one or more locations further includes determining one or more fixed frequency locations for transmission of the bundled SIB.
8. The method of claim 1 , wherein determining the one or more locations comprises determining subframes for transmission of the bundled SIB based on a received PBCH transmission including a reserved field indicating the subframes.
9. The method of claim 1 , wherein determining the one or more locations comprises determining frequency hopped locations for bundled SIBs having a same bundling size in a physical resource block (PRB) pair.
10. The method of claim 1 , wherein the PBCH is received in subframe 0 and subframe 5.
11. A method for wireless communications by a base station (BS), comprising:
determining one or more locations for transmitting a bundled system information block (SIB) to a user equipment (UE) for machine type communication (MTC);
transmitting the bundled SIB at the one or more locations;
transmitting one or more SIB retransmissions over a period, wherein a content of the system information for the SIB retransmissions is fixed over the period; and
transmitting an indication in a reserved field of a physical broadcast channel (PBCH) indicating a redundancy version (RV) and a modulation coding scheme (MCS) for the bundled SIB and SIB retransmissions.
12. The method of claim 11 , wherein the determination of the one or more locations is dependent, at least in part, on one or more supported services.
13. The method of claim 12 , wherein the one or more supported services is dependent, at least in part, on a service bandwidth.
14. The method of claim 12 , wherein the one or more services comprises at least one of: multicast broadcast media service (MBMS) or coverage enhancements.
15. The method of claim 14 , further comprising providing an MBMS configuration to the UE in a broadcast transmission.
16. The method of claim 11 , further comprising: refraining from transmitting, to the UE, an MTC-specific control channel with scheduling information indicating the one or more locations.
17. The method of claim 11 , wherein determining the one or more locations further includes determining one or more fixed frequency locations for transmitting the bundled SIB.
18. The method of claim 11 , wherein:
determining the one or more locations comprises determining subframes for transmission of the bundled SIB; and
the method further comprises transmitting a reserved field in the PBCH indicating the subframes.
19. The method of claim 11 , wherein determining the one or more locations comprises determining frequency hopped locations for transmission of bundled SIBs having a same bundling size in a physical resource block (PRB) pair.
20. An apparatus for wireless communications comprising:
at least one processor coupled with a memory having instructions stored thereon, the at least one processor configured to:
determine one or more locations for receiving a bundled system information block (SIB) transmission for machine type communication (MTC);
decode the bundled SIB received at the one or more locations by combining SIB retransmissions received over a period, wherein content of the system information for the SIB retransmissions is fixed over the period; and
a receiver configured to:
receive an indication in a reserved field of a physical broadcast channel (PBCH) indicating a redundancy version (RV) and a modulation coding scheme (MCS) for the bundled SIB and SIB retransmissions, wherein the combining uses the indicated RV and MCS; and
receive the bundled SIB and SIB retransmissions over the period.
21. The apparatus of claim 20 , wherein the at least one processor is further configured to determine one or more services supported by the apparatus.
22. An apparatus for wireless communications comprising:
at least one processor coupled with a memory having instructions stored thereon, the at least one processor configured to determine one or more locations for transmitting a bundled system information block (SIB) to a user equipment (UE) for machine type communication (MTC); and
a transmitter configured to:
transmit the bundled SIB at the one or more locations;
transmit one or more SIB retransmissions over a period, wherein a content of the system information for the SIB retransmissions is fixed over the period; and
transmit an indication in a reserved field of a physical broadcast channel (PBCH) indicating a redundancy version (RV) and a modulation coding scheme (MCS) for the bundled SIB and SIB retransmissions.
23. The apparatus of claim 22 , wherein the determination of the one or more locations is dependent, at least in part, on one or more supported services.