Channel-state information reference symbol scheduling in license-assisted access LTE

1. A method for configuring a user equipment, UE, in a telecommunications system, the method comprising:

configuring, by a network node, the UE with a Channel-State Information, CSI, measurement resource with subframe-less configuration;

sending, by the network node, a grant on Enhanced Physical Downlink Control Channel, (e)PDCCH, for the UE with a Radio Network Temporary Identifier, RNTI_CSI including specification of subframe configuration of CSI measurement resources, by sending the grant specifying that the CSI-measurement resources are those that fulfill the following condition:

10*SFN+SF(mod T period)= T offset;

10*SFN+SF<SFN grant*10 +SF grant+ N offset;

wherein:

SFN corresponds to a System frame number, SF corresponds to a Subframe number, mod T period corresponds to a CSI-measurement resource period, T offset corresponds to CSI-measurement resource subframe offset, SFN grant corresponds to the SFN in which the grant was sent, SF grant corresponds to the SF in which the grant was sent, and N offset corresponds to a number of SFs for which CSI-measurement resources are present as specified by mod T period and T offset; and

sending, by the network node, a CSI-reference signal, CSI-RS, according to a desired scheme in subframes indicated by the subframe configuration.

2. The method of claim 1 , wherein the sending the grant on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant on the (e)PDCCH to UEs with RNTI=RNTI_CSI indicating a subframe configuration I CSI-RS .

3. The method of claim 1 , wherein the sending the grant on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying a single subframe where CSI-measurement resources are present.

4. The method of claim 1 , wherein the sending the grant on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying one subframe for CSI-RS measurement resource and one subframe for CSI-Interference Measurement, CSI-IM, resource.

5. The method of claim 1 , further comprising:

sending a plurality of grants indicating different subframes for CSI-measurement resources for a plurality of groups of UEs, where the UEs within a group are to use the same subframes for the CSI-measurement resources.

6. The method of claim 1 , wherein the sending the grant on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying a subframe offset to UEs that are determined to be pre-configured with a CSI-measurement resource periodicity but not a subframe offset.

7. The method of claim 1 , wherein the sending the grant on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying an indication of subframe for an end of CSI-measurement resources.

8. A method for configuring a user equipment, UE by a network node of a telecommunications system, the method comprising:

receiving, by the UE and from the network node a configuration of CSI-measurement resources with subframe-less configuration,

wherein the CSI-measurement resources are those that fulfill the following condition:

10*SFN+SF(mod T period) = T offset;

10*SFN+SF<SFN grant*10 +SF grant + N offset;

wherein:

SFN corresponds to a System frame number, SF corresponds to a Subframe number, mod T period corresponds to a CSI-measurement resource period, T offset corresponds to CSI-measurement resource subframe offset, SFN grant corresponds to the SFN in which the grant was sent, SF grant corresponds to the SF in which the grant was sent, and N offset corresponds to a number of SFs for which CSI-measurement resources are present as specified by mod T period and T offset; and

based on detecting a RNTI_CSI grant in the received configuration, performing, by the UE, CSI measurements according to a subframe configuration indicated by the RNTI_CSI grant and the subframe-less configuration for CSI-measurement resources.

9. The method of claim 8 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant on (e)PDCCH with RNTI=RNTI_CSI indicating subframe configuration I CSI-RS .

10. The method of claim 8 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying a single subframe where CSI-measurement resources are present.

11. The method of claim 8 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying one subframe for a CSI-RS measurement resource and one subframe for CSI-IM resource.

12. The method of claim 8 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying a subframe offset that is pre-configured with a CSI-measurement resource periodicity but not a subframe offset.

13. The method of claim 8 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying an indication of subframe for an end of CSI-measurement resources.

14. A network node in a telecommunications system, the network node comprising:

a transceiver configured to provide radio communications with a user equipment, UE; and

a processor coupled to the transceiver, wherein the processor is configured to perform operations comprising:

configuring the UE with a Channel-State Information, CSI, measurement resource with subframe-less configuration;

sending a grant through the transceiver on Enhanced Physical Downlink Control Channel, (e)PDCCH, for the UE with a Radio Network Temporary Identifier, RNTI_CSI including specification of subframe configuration of CSI measurement resources, by sending the grant specifying that the CSI-measurement resources are those that fulfill the following condition:

10*SFN+SF(mod T period)= T offset;

10*SFN+SF<SFN grant*10+SF grant+ N offset;

wherein:

SFN corresponds to a System frame number, SF corresponds to a Subframe number, mod T period corresponds to a CSI-measurement resource period, T offset corresponds to CSI-measurement resource subframe offset, SFN grant corresponds to the SFN in which the grant was sent, SF grant corresponds to the SF in which the grant was sent, and N offset corresponds to a number of SFs for which CSI-measurement resources are present as specified by mod T period and T offset; and

sending through the transceiver a CSI-reference signal, CSI-RS, according to a desired scheme in subframes indicated by the subframe configuration.

15. The network node of claim 14 , wherein the sending the grant through the transceiver on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant on the (e)PDCCH to UEs with RNTI=RNTI_CSI indicating a subframe configuration I CSI-RS .

16. The network node of claim 14 , wherein the sending the grant through the transceiver on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying a single subframe where CSI-measurement resources are present.

17. The network node of claim 14 , wherein the sending the grant through the transceiver on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying one subframe for CSI-RS measurement resource and one subframe for CSI-Interference Measurement, CSI-IM, resource.

18. The network node of claim 14 , further comprising:

sending a plurality of grants indicating different subframes for CSI-measurement resources for a plurality of groups of UEs, where the UEs within a group are to use the same subframes for the CSI-measurement resources.

19. The network node of claim 14 , wherein the sending the grant through the transceiver on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying a subframe offset to UEs that are determined to be pre-configured with a CSI-measurement resource periodicity but not a subframe offset.

20. The network node of claim 14 , wherein the sending the grant through the transceiver on the (e)PDCCH for the UE with the RNTI_CSI including specification of subframe configuration of CSI measurement resources, comprises:

sending the grant specifying an indication of subframe for an end of CSI-measurement resources.

21. A network node for configuring a user equipment, UE, in a telecommunications system, the network node comprising a transceiver, a processor, and memory storing instructions that, when executed by the processor, cause the processor to perform operations comprising:

configuring the UE with a Channel-State Information, CSI, measurement resource with subframe-less configuration;

sending a grant through the transceiver on Enhanced Physical Downlink Control Channel, (e)PDCCH, for the UE with a Radio Network Temporary Identifier, RNTI_CSI including specification of subframe configuration of CSI measurement resources, by sending the grant specifying that the CSI-measurement resources are those that fulfill the following condition:

10*SFN+SF(mod T period)= T offset;

10*SFN+SF<SFN grant*10+SF grant+ N offset;

wherein:

SFN corresponds to a System frame number, SF corresponds to a Subframe number, mod T period corresponds to a CSI-measurement resource period, T offset corresponds to CSI-measurement resource subframe offset, SFN grant corresponds to the SFN in which the grant was sent, SF grant corresponds to the SF in which the grant was sent, and N offset corresponds to a number of SFs for which CSI-measurement resources are present as specified by mod T period and T offset; and

sending through the transceiver a CSI-reference signal, CSI-RS, according to a desired scheme in subframes indicated by the subframe configuration.

22. A user equipment, UE, that is configurable by a network node of a telecommunications system, the UE comprising:

a transceiver configured to provide radio communications with the network node; and

a processor coupled to the transceiver, wherein the processor is configured to perform operations comprising:

receiving from the network node a configuration of CSI-measurement resources with subframe-less configuration,

wherein the CSI-measurement resources are those that fulfill the following condition:

10*SFN+SF(mod T period)= T offset;

10*SFN+SF<SFN grant*10+SF grant+ N offset;

wherein:

SFN corresponds to a System frame number, SF corresponds to a Subframe number, mod T period corresponds to a CSI-measurement resource period, T offset corresponds to CSI-measurement resource subframe offset, SFN grant corresponds to the SFN in which the grant was sent, SF grant corresponds to the SF in which the grant was sent, and N offset corresponds to a number of SFs for which CSI-measurement resources are present as specified by mod T period and T offset; and

based on detecting a RNTI_CSI grant in the received configuration, performing CSI measurements according to a subframe configuration indicated by the RNTI_CSI grant and the subframe-less configuration for CSI-measurement resources.

23. The UE of claim 22 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant on (e)PDCCH with RNTI=RNTI_CSI indicating subframe configuration I CSI-RS .

24. The UE of claim 22 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying a single subframe where CSI-measurement resources are present.

25. The UE of claim 22 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying one subframe for a CSI-RS measurement resource and one subframe for CSI-IM resource.

26. The UE of claim 22 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying a subframe offset that is pre-configured with a CSI-measurement resource periodicity but not a subframe offset.

27. The UE of claim 22 , wherein the receiving from the network node the configuration of CSI-measurement resources with subframe-less configuration, comprises:

receiving a grant specifying an indication of subframe for an end of CSI-measurement resources.

28. A user equipment, UE, that is configurable by a network node of a telecommunications system, wherein the UE comprises a processor and memory storing instructions that, when executed by the processor, cause the processor to perform operations comprising:

receiving from the network node a configuration of CSI-measurement resources with subframe-less configuration,

wherein the CSI-measurement resources are those that fulfill the following condition:

10*SFN+SF(mod T period)= T offset;

10*SFN+SF<SFN grant*10+SF grant+ N offset;

wherein:

SFN corresponds to a System frame number, SF corresponds to a Subframe number, mod T period corresponds to a CSI-measurement resource period, T offset corresponds to CSI-measurement resource subframe offset, SFN grant corresponds to the SFN in which the grant was sent, SF grant corresponds to the SF in which the grant was sent, and N offset corresponds to a number of SFs for which CSI-measurement resources are present as specified by mod T period and T offset; and

based on detecting a RNTI_CSI grant in the received configuration, performing CSI measurements according to a subframe configuration indicated by the RNTI_CSI grant and the subframe-less configuration for CSI-measurement resources.