Transmission of control channel and data channels for coverage enhancements
Methods and apparatus are provided for a base station to transmit and for a User Equipment (UE) to receive repetitions of an enhanced physical downlink control channel (EPDCCH). Time and frequency resources for EPDCCH repetitions are defined together with restrictions in time resources to provide UE power savings. Time and frequency resources are also defined for repetitions of a physical downlink shared channel (PDSCH) transmission and for repetitions of a physical uplink shared channel (PUSCH) transmission. Methods and apparatus are also provided for the UE to transmit and for the base station to receive acknowledgement information in repetitions of a physical uplink shared channel (PUCCH).
1. A method for a UE to transmit a physical uplink control channel (PUCCH) comprising:
receiving a configuration for a number of time units for a PUCCH transmission; and
transmitting the PUCCH over the number of time units, wherein:
when the number of time units is one, the PUCCH transmission is in two different frequency resource blocks (RBs) over two respective sets of symbols within a time unit wherein a second set of symbols is after a first set of symbols; and
when the number of time units is larger than one, the PUCCH transmission is only in a first RB within a first time unit and only in a second RB within a second time unit wherein the first and second RBs are different.
2. The method of claim 1 , further comprising:
transmitting the PUCCH only in a first resource in the first RB within the first time unit and only in a second resource in the second RB within the second time unit.
3. The method of claim 1 , further comprising:
transmitting the PUCCH only in a first resource over the first set of symbols and only in a second resource over the second set of symbols.
4. The method of claim 1 , further comprising:
receiving a configuration for a subset of time units within a set of time units; and
transmitting the PUCCH only in time units from the subset of time units.
5. The method of claim 1 , further comprising:
receiving a configuration for a set of RBs, wherein:
the first and second RBs are from the set of RBs; and
the set of RBs is a subset of RBs in a system bandwidth.
6. The method of claim 1 , wherein the first RB is determined according to an index of the first time unit.
7. A User Equipment (UE) comprising:
a receiver configured to receive a number of time units for a transmission of a physical uplink control channel (PUCCH); and
a transmitter configured to transmit the PUCCH over the number of time units, wherein:
when the number of time units is one, the PUCCH transmission is in two different frequency resource blocks (RBs) over two respective sets of symbols within a time unit wherein a second set of symbols is after a first set of symbols; and
when the number of time units is larger than one, the PUCCH transmission is only in a first RB within a first time unit and only in a second RB within a second time unit wherein the first and second RBs are different.
8. The UE of claim 7 , wherein the transmitter is further configured to transmit the PUCCH only in a first resource in the first RB within the first time unit and only in a second resource in the second RB within the second time unit.
9. The UE of claim 7 , wherein the transmitter is further configured to transmit the PUCCH only in a first resource over the first set of symbols and only in a second resource over the second set of symbols.
10. The UE of claim 7 , wherein:
the receiver is further configured to receive a configuration for a subset of time units within a set of time units; and
the transmitter is further configured to transmit the PUCCH only in time units from the subset of time units.
11. The UE of claim 7 , wherein:
the transmitter is further configured to modulate information symbols in the PUCCH with an orthogonal covering code (OCC); and
a length of the OCC is determined according to PUCCH transmission in one time unit.
12. The UE of claim 7 , wherein:
the receiver is further configured to receive a configuration for a set of RBs, wherein:
the first and second RBs are from the set of RBs; and
the set of RBs is a subset of RBs in a system bandwidth.
13. The UE of claim 7 , wherein the transmitter is further configured to determine the first RB according to an index of the first time unit.
14. A base station comprising:
a transmitter configured to transmit a number of time units for a reception of a physical uplink control channel (PUCCH); and
a receiver configured to receive the PUCCH over the number of time units, wherein:
when the number of time units is one, a PUCCH transmission is in two different frequency resource blocks (RBs) over two respective sets of symbols within a time unit wherein a second set of symbols is after a first set of symbols; and
when the number of time units is larger than one, the PUCCH transmission is only in a first RB within a first time unit and only in a second RB within a second time unit wherein the first and second RBs are different.
15. The base station of claim 14 , wherein the receiver is further configured to receive the PUCCH only in a first resource in the first RB within the first time unit and only in a second resource in the second RB within the second time unit.
16. The base station of claim 14 , wherein the receiver is further configured to receive the PUCCH only in a first resource over the first set of symbols and only in a second resource over the second set of symbols.
17. The base station of claim 14 , wherein:
the transmitter is further configured to transmit a configuration for a subset of time units within a set of time units; and
the receiver is further configured to receive the PUCCH only in time units from the subset of time units.
18. The base station of claim 14 , wherein:
the receiver is further configured to demodulate information symbols in the PUCCH with an orthogonal covering code (OCC); and
a length of the OCC is determined according to PUCCH reception in one time unit.
19. The base station of claim 14 , wherein:
the transmitter is further configured to transmit a configuration for a set of RBs, wherein:
the first and second RBs are from the set of RBs; and
the set of RBs is a subset of RBs in a system bandwidth.
20. The UE of claim 14 , wherein the receiver is further configured to determine the first RB according to an index of the first time unit.