Efficient resource reservation for LTE-m and NB-IOT

1 . A network node for handling communication of wireless devices in a wireless communication network, the network node comprising processing circuitry configured to:

send a first configuration message to a wireless device, wherein the first configuration message comprises a resource reservation scheme;

wherein the resource reservation scheme comprises at least one bitmap indicating at least one reserved resource, wherein the at least one bitmap indicates reserved resources within a subframe, and wherein resources carrying a predefined reference signal have been excluded from the bitmap, such that the at least one bitmap does not indicate whether the resources carrying the predefined reference signal are reserved resources;

wherein the predefined reference signal is at least one of a Demodulation Reference Signal, DMRS, a Cell-specific Reference Signal, CRS, and a Narrowband Reference Signal, NRS; and

wherein the resource reservation scheme comprises a two-level bitmap indicating the at least one reserved resource.

2 . The network node of claim 1 , wherein the processing circuitry is further configured to:

send a transmission comprising control or data to the wireless device based on the at least one reserved resource.

3 . The network node of claim 1 , wherein a first level of the two-level bitmap indicates a subset of subframes of the bitmap, and a second level of the two-level bitmap indicates any reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol(s) within a subframe of the subset of subframes.

4 . The network node of claim 1 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within a subframe of the bitmap, wherein any OFDM symbol carrying a Narrowband Reference Signal, NRS, is excluded from the bitmap.

5 . The network node of claim 1 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within a subframe of the bitmap, wherein any OFDM symbol carrying a Demodulation Reference Signal, DMRS, is excluded from the bitmap.

6 . The network node of claim 1 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within a subframe of the bitmap, wherein any OFDM symbol carrying a Cell-specific Reference Signal, CRS, is excluded from the bitmap.

7 . The network node of claim 1 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within the subframe, and

wherein the resource reservation scheme is based on a pattern of OFDM symbols carrying Narrowband Reference Signals, NRSs, within the subframe such that the indicated at least one reserved resource is based on any remaining OFDM symbols that are not carrying NRSs.

8 . The network node of claim 1 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within the subframe, and

wherein the resource reservation scheme is based on a pattern of OFDM symbols carrying Demodulation Reference Signals, DMRSs, and OFDM symbols carrying Cell-specific Reference Signals, CRSs, within the subframe such that the indicated at least one reserved resource is based on any remaining OFDM symbols that are not carrying DMRSs or CRSs.

9 . The network node of claim 1 , wherein a granularity of the resource reservation scheme is a one Orthogonal Frequency-Division Multiplexing, OFDM, symbol granularity.

10 . The network node of claim 1 , wherein a resource indicated as a reserved resource is not used for transmission from the network node to the wireless device; and

wherein a resource not indicated as a reserved resource is allowable to be used for transmission from the network node to the wireless device.

11 . A method performed by a network node for handling communication of wireless devices in a wireless communication network, the method comprising:

sending a first configuration message to a wireless device, wherein the first configuration message comprises a resource reservation scheme;

wherein the resource reservation scheme comprises at least one bitmap indicating at least one reserved resource, wherein the at least one bitmap indicates reserved resources within a subframe, and wherein resources carrying a predefined reference signal have been excluded from the bitmap, such that the at least one bitmap does not indicate whether the resources carrying the predefined reference signal are reserved resources;

wherein the predefined reference signal is at least one of a Demodulation Reference Signal, DMRS, a Cell-specific Reference Signal, CRS, and a Narrowband Reference Signal, NRS; and

wherein the resource reservation scheme comprises a two-level bitmap indicating the at least one reserved resource.

12 . A wireless device for communicating with a network node in a wireless communication network, the wireless device comprising processing circuitry configured to:

receive a first configuration message from the network node, the configuration message comprising a resource reservation scheme indicating at least one reserved resource;

use, based on the received first configuration message, one or more radio resources for communicating in the wireless communication network;

wherein the resource reservation scheme comprises at least one bitmap indicating the at least one reserved resource, wherein the at least one bitmap indicates reserved resources within a subframe, and wherein resources carrying a predefined reference signal have been excluded from the bitmap, such that the at least one bitmap does not indicate whether the resources carrying the predefined reference signal are reserved resources;

wherein the predefined reference signal is at least one of a Demodulation Reference Signal, DMRS, a Cell-specific Reference Signal, CRS, and a Narrowband Reference Signal, NRS; and

wherein the resource reservation scheme comprises a two-level bitmap indicating the at least one reserved resource.

13 . The wireless device of claim 12 , wherein a first level of the two-level bitmap indicates a subset of subframes of the bitmap, and a second level of the two-level bitmap indicates any reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol(s) within a subframe of the subset of subframes.

14 . The wireless device of claim 12 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within a subframe of the bitmap, wherein any OFDM symbol carrying a Narrowband Reference Signal, NRS, is excluded from the bitmap.

15 . The wireless device of claim 12 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within a subframe of the bitmap, wherein any OFDM symbol carrying a Demodulation Reference Signal, DMRS, is excluded from the bitmap.

16 . The wireless device of claim 12 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within a subframe of the bitmap, wherein any OFDM symbol carrying a Cell- specific Reference Signal, CRS, is excluded from the bitmap.

17 . The wireless device of claim 12 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within the subframe, and

wherein the resource reservation scheme is based on a pattern of OFDM symbols carrying Narrowband Reference Signals, NRSs, within the subframe such that the indicated at least one reserved resource is based on any remaining OFDM symbols that are not carrying NRSs.

18 . The wireless device of claim 12 , wherein the two-level bitmap indicates at least one reserved Orthogonal Frequency-Division Multiplexing, OFDM, symbol within the subframe, and

wherein the resource reservation scheme is based on a pattern of OFDM symbols carrying Demodulation Reference Signals, DMRSs, and OFDM symbols carrying Cell-specific Reference Signals, CRSs, within the subframe such that the indicated at least one reserved resource is based on any remaining OFDM symbols that are not carrying DMRSs or CRSs.

19 . The wireless device of claim 12 , wherein a granularity of the resource reservation scheme is a one Orthogonal Frequency-Division Multiplexing, OFDM, symbol granularity.

20 . The wireless device of claim 12 , wherein the processing circuitry is further configured to:

receive a transmission comprising control or data from the network node based on the at least one indicated reserved resource.

21 . The wireless device of claim 12 , wherein a resource indicated as a reserved resource is not used for transmission from the wireless device to the network node; and

wherein a resource not indicated as a reserved resource is allowable to be used for transmission from the wireless device to the network node.

22 . A method performed by a wireless device for communication with a network node in a wireless communication network, the method comprising:

receiving a first configuration message from the network node, the configuration message comprising a resource reservation scheme indicating at least one reserved resource; and

using, based on the received first configuration message, one or more radio resources for communicating in the wireless communication network;

wherein the resource reservation scheme comprises at least one bitmap indicating the at least one reserved resource, wherein the at least one bitmap indicates reserved resources within a subframe, and wherein resources carrying a predefined reference signal have been excluded from the bitmap, such that the at least one bitmap does not indicate whether the resources carrying the predefined reference signal are reserved resources;

wherein the predefined reference signal is at least one of a Demodulation Reference Signal, DMRS, a Cell-specific Reference Signal, CRS, and a Narrowband Reference Signal, NRS; and

wherein the resource reservation scheme comprises a two-level bitmap indicating the at least one reserved resource.