Transmission of system information for low cost user equipment
Methods and apparatus are provided for transmitting from a base station and for receiving from a low cost user equipment (UE) system information and for the low cost UE to determine subframes to receive repetitions of a transmission from the base station or to transmit repetitions of a transmission to the base station.
1. A method, comprising:
receiving a number of repetitions for a physical downlink shared channel (PDSCH) that provides a first system information block (SIB1) in a set of sub-bands (SBs) of a cell; and
determining the set of SBs to include the SBs with indexes
( N ID cell mod N SB DL +i·└N SB DL /m ┘)mod N SB DL ,
where i−0, . . . , m−1, m is an integer number, N SB DL is a number of SBs in a downlink (DL) system bandwidth (BW) that are available for the reception of the number of repetitions, and N ID cell is a physical cell identifier (PCID).
2. The method of claim 1 , wherein an SB includes 6 resource blocks (RBs), an RB includes 12 sub-carriers, and the set of SBs includes all SBs in the DL system BW except for SBs overlapping with the middle 6 RBs of the DL system BW.
3. The method of claim 2 , wherein m=2 when N ID cell is smaller than or equal to a predetermined number and the set of SBs includes two or more SBs.
4. The method of claim 1 , wherein m=4 when N ID cell is larger than a predetermined number.
5. The method of claim 1 , wherein the repetitions of the PDSCH reception cycle through the SBs in the set of SBs serially according to the value of starting from i=0.
6. The method of claim 1 , wherein one repetition of the PDSCH reception is in one subframe of a frame that includes 10 subframes, and wherein the number of repetitions of the PDSCH reception over 8 frames is indicated by a field in a master information block (MIB).
7. A user equipment (UE), comprising:
a receiver configured to receive a number of repetitions for a physical downlink shared channel (PDSCH) that provides a first system information block (SIB1) in a set of sub-bands (SBs) of a cell; and
a processor configured to determine the set of SBs to include the SBs with indexes
( N ID cell mod N SB DL +i·└N SB DL /m ┘)mod N SB DL ,
where i−0, . . . , m−1, m is an integer, N SB DL is a number of SBs in a downlink (DL) system bandwidth (BW) that are available for the reception of the number of repetitions, and N ID cell is a physical cell identifier (PCID).
8. The UE of claim 7 , wherein an SB includes 6 resource blocks (RBs), an RB includes 12 sub-carriers, and the set of SBs includes all SBs in the DL system BW except for SBs overlapping with the middle 6 RBs of the DL system BW.
9. The UE of claim 8 , wherein m=2 when N SB DL is smaller than or equal to a predetermined number and the set of SBs includes two or more SBs.
10. The UE of claim 7 , wherein m=4 when N SB DL is larger than a predetermined number.
11. The UE of claim 7 , wherein the repetitions of the PDSCH reception cycle through the SBs in the set of SBs serially according to the value of i starting from i=0.
12. The UE of claim 7 , wherein one repetition of the PDSCH reception is in one subframe of a frame that includes 10 subframes, and wherein the number of repetitions of the PDSCH reception over 8 frames is indicated by a field in a master information block (MIB).
13. The UE of claim 12 , wherein the subframes of a frame that include a repetition of the PDSCH reception are predetermined based on the number of repetitions.
14. A base station, comprising:
a transmitter configured to transmit a number of repetitions for a physical downlink shared channel (PDSCH) that provides a first system information block (SIB1) in a set of sub-bands (SBs) of a cell; and
a processor configured to determine the set of SBs to include the SBs with indexes
( N ID cell mod N SB DL +i·└N SB DL /m ┘)mod N SB DL ,
where i−0, . . . , m−1, m is an integer, N SB DL is a number of SBs in a downlink (DL) system bandwidth (BW) that are available for the reception of the number of repetitions, and N ID cell is a physical cell identifier (PCID).
15. The base station of claim 14 , wherein an SB includes 6 resource blocks (RBs), an RB includes 12 sub-carriers, and the set of SBs includes all SBs in the DL system BW except for SBs overlapping with the middle 6 RBs of the DL system BW.
16. The base station of claim 15 , wherein m=2 when N SB DL is smaller than or equal to a predetermined number and the set of SBs includes 2 or more SBs.
17. The base station of claim 14 , wherein m=4 when N SB DL is larger than a predetermined number.
18. The base station of claim 14 , wherein the repetitions of the PDSCH transmission cycle through the SBs in the set of SBs serially according to the value of i starting from i=0.
19. The base station of claim 14 , wherein one repetition of the PDSCH transmission is in one subframe of a frame that includes 10 subframes, and wherein the number of repetitions of the PDSCH transmission over 8 frames is indicated by a field in a master information block (MIB).
20. The base station of claim 19 , wherein the subframes of a frame that include a repetition of the PDSCH transmission are predetermined based on the number of repetitions.