Support of 64 QAM for efeMTC PDSCH transmission

1. A user equipment (UE), configured for coverage enhanced (CE) machine type communication (MTC), the UE comprising:

one or more processors configured to:

encode, at the UE, a UE capability message for transmission to a base station, wherein the UE capability message includes a capability to support communication using a modulation and coding scheme (MCS) that includes 64 quadrature amplitude modulation (QAM);

decode, at the UE, a higher layer signaling message to configure the UE to operate in a CE mode A; and

decode, at the UE, data received in a physical downlink shared channel (PDSCH) transmission to the UE that is modulated using a 64 QAM; and

a memory interface configured to receive from a memory the UE capability message.

2. The UE of claim 1 , further comprising a transceiver configured to receive the PDSCH transmission via a unicast transmission from the base station.

3. The UE of claim 1 , wherein the one or more processors are further configured to decode, at the UE, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a PDSCH repetition number field that indicates a repetition number of 1 for the PDSCH transmission, when the data for the PDSCH transmission is modulated using the 64 QAM.

4. The UE of claim 1 , wherein the one or more processors are further configured to decode, at the UE, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a MPDCCH repetition number field that indicates a repetition number of 1 for the MPDCCH, when the data for the PDSCH transmission is modulated using the 64 QAM.

5. The UE of claim 1 , wherein the one or more processors are further configured to decode, at the UE, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a MPDCCH with a maximum number of repetitions configured in a UE-specific search space, wherein the maximum number of repetitions is less than or equal to a predefined integer, when the data for the PDSCH transmission is modulated using the 64 QAM.

6. The UE of claim 1 , wherein the one or more processors are further configured to encode a channel quality index (CQI) level based on a CQI table, wherein the CQI table comprises:

code rate × 1024 ×

efficiency ×

CQI index

modulation

R CSI

R CSI

0

out of range

1

QPSK

40

0.0781

2

QPSK

78

0.1523

3

QPSK

120

0.2344

4

QPSK

193

0.3770

5

QPSK

308

0.6016

6

QPSK

449

0.8770

7

QPSK

602

1.1758

8

16QAM

378

1.4766

9

16QAM

490

1.9141

10

16QAM

616

2.4063

11

64QAM

466

2.7305

12

64QAM

567

3.3223

13

64QAM

666

3.9023

14

64QAM

772

4.5234

15

64QAM

873

5.1152

7. The UE of claim 1 , wherein the one or more processors are further configured to decode a 5-bit modulation and coding scheme (MCS) field in a downlink control information (DCI) format 6-1A received in a MTC physical downlink control channel (MPDCCH), wherein the 5-bit MCS field includes a 4-bit MCS field plus a frequency hopping flag that is interpreted as a most significant bit of the 5-bit MCS field, when a number of repetitions indicated for the PDSCH transmission is 1, to enable a size of the DCI format 6-1A to remain unchanged.

8. The UE of claim 7 , wherein the one or more processors are further configured to decode the 5-bit MCS field to select an MCS index based at least on information in a table comprising:

MCS Index

Modulation Order

Modulation Order

TBS Index

I MCS

Q m

Q′ m

I TBS

0

2

2

0

1

2

2

1

2

2

2

2

3

2

2

3

4

2

2

4

5

2

4

5

6

2

4

6

7

2

4

7

8

2

4

8

9

2

4

9

10

4

6

9

11

4

6

10

12

4

6

11

13

4

6

12

14

4

6

13

15

4

6

14

16

4

6

15

17

6

6

15

18

6

6

16

19

6

6

17

20

6

6

18

21

6

6

19

22

6

6

20

23

6

6

21

24

6

6

22

25

6

6

23

26

6

6

24

27

6

6

25

28

6

6

26/26A

29

2

2

reserved

30

4

4

31

6

6

9. The UE of claim 1 , wherein the one or more processors are further configured to select a transport block size (TBS) value based on a predetermined table that includes a selected modulation and coding scheme (MCS) index value and a selected transport block size (TBS) index value.

10. The UE of claim 9 , wherein the one or more processors are further configured to select a maximum TBS value that is supported by the UE when the TBS value determined by the TBS index and PRB allocation, from the predetermined table, is greater than the maximum TBS value.

11. The UE of claim 1 , further comprising a transceiver configured to decode the higher layer signaling message or a second higher layer signaling message to semi-statically configure the UE to decode the PDSCH transmission that is modulated using the 64 QAM.

12. A base station configured for coverage enhanced (CE) machine type communication (MTC), the base station comprising:

one or more processors configured to:

decode, at the base station, a user equipment (UE) capability message received from a UE, wherein the UE capability message includes a capability of the UE to support communication using a modulation and coding scheme (MCS) that includes 64 quadrature amplitude modulation (QAM);

encode, at the base station, a higher layer signaling message for transmission to the UE to configure the UE to operate in a CE mode A; and

encode data to be modulated using a MCS that includes a 64 QAM, at the base station, for transmission to the UE in a physical downlink shared channel (PDSCH); and

a memory interface configured to send to a memory the UE capability message.

13. The base station of claim 12 , further comprising a transceiver configured to transmit the PDSCH via a unicast transmission from the base station.

14. The base station of claim 12 , wherein the one or more processors are further configured to encode, at the base station, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a PDSCH repetition number field that indicates a repetition number of 1 for the PDSCH, when the data for the PDSCH is modulated using the 64 QAM.

15. The base station of claim 12 , wherein the one or more processors are further configured to encode, at the base station, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a MPDCCH repetition number field that indicates a repetition number of 1 for the MPDCCH, when the data for the PDSCH is modulated using the 64 QAM.

16. The base station of claim 12 , wherein the one or more processors are further configured to encode, at the base station, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a MPDCCH with a maximum number of repetitions configured in a UE-specific search space, wherein the maximum number of repetitions is less than or equal to a predefined integer, when the data for the PDSCH is modulated using the 64 QAM.

17. The base station of claim 12 , wherein the one or more processors are further configured to decode a channel quality index (CQI) received from the UE based on a COI table, wherein the COI table comprises:

code rate × 1024 ×

efficiency ×

CQI index

modulation

R CSI

R CSI

0

out of range

1

QPSK

40

0.0781

2

QPSK

78

0.1523

3

QPSK

120

0.2344

4

QPSK

193

0.3770

5

QPSK

308

0.6016

6

QPSK

449

0.8770

7

QPSK

602

1.1758

8

16QAM

378

1.4766

9

16QAM

490

1.9141

10

16QAM

616

2.4063

11

64QAM

466

2.7305

12

64QAM

567

3.3223

13

64QAM

666

3.9023

14

64QAM

772

4.5234

15

64QAM

873

5.1152

18. The base station of claim 12 , wherein the one or more processors are further configured to encode a 5-bit modulation and coding scheme (MCS) field in a downlink control information (DCI) format 6-1A for transmission in a MTC physical downlink control channel (MPDCCH), wherein the 5-bit MCS field includes a 4-bit MCS field plus a frequency hopping flag that is interpreted as a most significant bit of the 5-bit MCS field, when a number of repetitions indicated for the PDSCH is 1, to enable a size of the DCI format 6-1A to remain unchanged.

19. The base station of claim 18 , wherein the one or more processors are further configured to use the 5-bit MCS field to select an MCS index based at least on information in a table comprising:

MCS Index

Modulation Order

Modulation Order

TBS Index

I MCS

Q m

Q′ m

I TBS

0

2

2

0

1

2

2

1

2

2

2

2

3

2

2

3

4

2

2

4

5

2

4

5

6

2

4

6

7

2

4

7

8

2

4

8

9

2

4

9

10

4

6

9

11

4

6

10

12

4

6

11

13

4

6

12

14

4

6

13

15

4

6

14

16

4

6

15

17

6

6

15

18

6

6

16

19

6

6

17

20

6

6

18

21

6

6

19

22

6

6

20

23

6

6

21

24

6

6

22

25

6

6

23

26

6

6

24

27

6

6

25

28

6

6

26/26A

29

2

2

reserved

30

4

4

31

6

6

20. The base station of claim 12 , wherein the one or more processors are further configured to encode a transport block size (TBS) index value and a number of physical resource blocks (N PRB ) to enable the UE to select a TBS value from a predetermined table.

21. The base station of claim 20 , wherein the one or more processors are further configured to select a maximum TBS value that is supported by the UE when the TBS value determined by the TBS index and PRB allocation, from the predetermined table, is greater than the maximum TBS value.

22. At least one non-transitory machine readable storage medium having instructions embodied thereon for a base station configured for coverage enhanced (CE) machine type communication (MTC), the instructions thereon when executed by one or more processors at the UE of the base station perform the following:

decode, at the base station, a user equipment (UE) capability message received from a UE, wherein the UE capability message includes a capability of the UE to support communication using a modulation and coding scheme (MCS) that includes 64 quadrature amplitude modulation (QAM);

encode, at the base station, a higher layer signaling message for transmission to the UE to configure the UE to operate in a CE mode A; and

encode data to be modulated using a MCS that includes a 64 QAM, at the base station, for transmission to the UE in a physical downlink shared channel (PDSCH).

23. The at least one non-transitory machine readable storage medium in claim 22 further comprising instructions, that when executed by one or more processors at the base station, perform the following:

encode, at the base station, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a PDSCH repetition number field that indicates a repetition number of 1 for the PDSCH, when the data for the PDSCH is modulated using the 64 QAM.

24. The at least one non-transitory machine readable storage medium in claim 22 further comprising instructions, that when executed by one or more processors of a base station, perform the following:

encode, at the base station, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a MPDCCH repetition number field that indicates a repetition number of 1 for the MPDCCH, when the data for the PDSCH is modulated using the 64 QAM.

25. The at least one non-transitory machine readable storage medium in claim 22 further comprising instructions, that when executed by one or more processors at the base station, perform the following:

encode, at the base station, downlink control information (DCI) in a MTC physical downlink control channel (MPDCCH), wherein the DCI includes a MPDCCH with a maximum number of repetitions configured in a UE-specific search space, wherein the maximum number of repetitions is less than or equal to a predefined integer, when the data for the PDSCH is modulated using the 64 QAM.

26. The at least one non-transitory machine readable storage medium in claim 22 further comprising instructions, that when executed by one or more processors at the base station, perform the following:

encode a 5-bit modulation and coding scheme (MCS) field in a downlink control information (DCI) format 6-1A for transmission in a MTC physical downlink control channel (MPDCCH), wherein the 5-bit MCS field includes a 4-bit MCS field plus a frequency hopping flag that is interpreted as a most significant bit of the 5-bit MCS field, when a number of repetitions indicated for the PDSCH is 1, to enable a size of the DCI format 6-1A to remain unchanged.