Support for frequency-overlapping carriers

1. A method performed by a network node for providing support for frequency-overlapping carriers among a first radio access technology, RAT, and a second RAT, the method comprising:

determining second RAT information to signal to the first RAT wireless device, the second RAT information configured to allow the first RAT wireless device to determine, at a resource element level, resources reserved for second RAT transmissions the resources reserved for the second RAT transmissions including a first plurality of resource elements of a first symbol, the second RAT information is configured to allow the first RAT wireless device to differentiate second RAT transmissions on the first plurality of resource elements of the first symbol from first RAT transmissions on a second plurality of resources elements of the first symbol, the first plurality of resources element being different from the second plurality of resource elements; and

causing the second RAT information to be communicated to the first RAT wireless device.

2. The method of claim 1 , wherein the reserved resources for the second RAT transmissions correspond to resources reserved for at least one of synchronization signal transmission, master information block, MIB, transmission, system information block, SIB, transmission, system information, SI, message transmission, downlink control information transmission, and reference signal transmission.

3. The method of claim 2 , wherein the reference signal transmission includes the transmission of a cell-specific reference signal.

4. The method of claim 1 , wherein the second RAT information includes at least one of:

at least one physical resource block, PRB, index used for the second RAT transmissions;

a timing relationship between a first RAT cell and a second RAT cell;

a physical cell identity and at least one number of at least one reference signal port; and

an indication of a second RAT downlink control region.

5. The method of claim 1 , wherein the second RAT information includes at least one of:

System Information Block, SIB, scheduling information;

physical downlink shared channel bitmap patterns for the second RAT;

a system information, SI, message including scheduling information; and

multi broadcast single frequency network, MBSFN, configuration information.

6. The method of claim 1 , wherein the second RAT information includes a frequency relationship between a first RAT cell and a second RAT cell.

7. The method of claim 1 , wherein the second RAT information includes an indication whether a second RAT cell uses one of a cyclic prefix, CP, and an extended CP.

8. The method of claim 1 , wherein the first RAT is New Radio, NR, and the second RAT is Long Term Evolution, LTE.

9. A network node for providing support for frequency-overlapping carriers among a first radio access technology, RAT, and a second RAT, the network node comprising:

processing circuitry configured to:

determine second RAT information to signal to the first RAT wireless device, the second RAT information configured to allow the first RAT wireless device to determine, at a resource element level, resources reserved for second RAT transmissions, the resources reserved for the second RAT transmissions including a first plurality of resource elements of a first symbol, the second RAT information is configured to allow the first RAT wireless device to differentiate second RAT transmissions on the first plurality of resource elements of the first symbol from first RAT transmissions on a second plurality of resources elements of the first symbol, the first plurality of resources element being different from the second plurality of resource elements; and

cause the second RAT information to be communicated to the first RAT wireless device.

10. The network node of claim 9 , wherein the reserved resources for the second RAT transmissions correspond to resources reserved for at least one of synchronization signal transmission, master information block, MIB, transmission, system information block, SIB, transmission, system information, SI, message transmission, downlink control information transmission, and reference signal transmission.

11. The network node of claim 10 , wherein the reference signal transmission includes the transmission of a cell-specific reference signal.

12. A method performed by a wireless device for supporting frequency-overlapping carriers among a first radio access technology, RAT, and a second RAT the method comprising:

receiving second RAT information;

determining, at a resource element level, resources reserved for second RAT transmissions based on the second RAT information;

receiving transmissions including first RAT resources and second RAT resources, the second RAT resources including a first plurality of resource elements of a first symbol;

differentiating, at the resource element level, of reserved resources for second RAT transmissions on the first plurality of resource elements of the first symbol from resources for the first RAT transmissions on a second plurality of resources elements of the first symbol, the first plurality of resources elements being different from the second plurality of resource elements; and

processing at least first RAT resources based at least in part on the second RAT information.

13. The method of claim 12 , wherein the reserved resources for the second RAT transmissions correspond to resources reserved for at least one of synchronization signal transmission, master information block, MIB, transmission, system information block, SIB, transmission, system information, SI, message transmission, downlink control information transmission, and reference signal transmission.

14. The method of claim 13 , wherein the reference signal transmission includes the transmission of a cell-specific reference signal.

15. The method of claim 12 , wherein the second RAT information includes at least one of:

at least one physical resource block, PRB, index used for the second RAT transmissions;

a timing relationship between a first RAT cell and a second RAT cell;

a physical cell identity and at least one number of at least one reference signal port; and

an indication of a second RAT downlink control region.

16. The method of claim 12 , wherein the second RAT information includes at least one of:

System Information Block, SIB, scheduling information;

physical downlink shared channel bitmap patterns for the second RAT;

a system information, SI, message including scheduling information; and

multi broadcast single frequency network, MBSFN, configuration information.

17. The method of claim 12 , wherein the second RAT information includes a frequency relationship between a first RAT cell and a second RAT cell.

18. The method of claim 12 , wherein the second RAT information includes an indication whether a second RAT cell uses one of a cycle prefix, CP, and an extended CP.

19. The method of claim 12 , wherein the first RAT is New Radio, NR, and the second RAT is Long Term Evolution, LTE.

20. A wireless device for supporting frequency-overlapping carriers among a first radio access technology, RAT, and a second RAT, the wireless device comprising:

processing circuitry configured to:

receive second RAT information;

determine, at a resource element level, resources reserved for second RAT transmissions based on the second RAT information, the reserved resources for the second RAT transmissions including a first plurality of resource elements of a first symbol;

receive transmissions including first RAT resources and second RAT resources;

differentiate, at the resource element level, of reserved resources for second RAT transmissions on a first plurality of resource elements of the first symbol from resources for the first RAT transmissions on a second plurality of resources elements of the first symbol, the first plurality of resources elements being different from the second plurality of resource elements; and

process at least first RAT resources based at least in part on the second RAT information.

21. The wireless device of claim 20 , wherein the reserved resources for the second RAT transmissions correspond to resources reserved for at least one of synchronization signal transmission, master information block, MIB, transmission, system information block, SIB, transmission, system information, SI, message transmission, downlink control information transmission, and reference signal transmission.

22. The wireless device of claim 21 , wherein the reference signal transmission includes the transmission of a cell-specific reference signal.

23. The wireless device of claim 20 , wherein the second RAT information includes at least one of:

at least one physical resource block, PRB, index used for the second RAT transmissions;

a timing relationship between a first RAT cell and a second RAT cell;

a physical cell identity and at least one number of at least one reference signal port; and

an indication of a second RAT downlink control region.

24. The wireless device of claim 20 , wherein the second RAT information includes at least one of:

System Information Block, SIB, scheduling information;

physical downlink shared channel bitmap patterns for the second RAT;

a system information, SI, message including scheduling information; and

multi broadcast single frequency network, MBSFN, configuration information.

25. The wireless device of claim 20 , wherein the second RAT information includes a frequency relationship between a first RAT cell and a second RAT cell.

26. The wireless device of claim 20 , wherein the second RAT information includes an indication whether a second RAT cell uses one of a cycle prefix, CP, and an extended CP.

27. The wireless device of claim 20 , wherein the first RAT is New Radio, NR, and the second RAT is Long Term Evolution, LTE.