Paging and DRX enhancements for eMTC-U (IOT-U)

1. A method of monitoring paging occasions on unlicensed spectrum, comprising:

defining, at a user equipment (UE), a paging frame window (PFW) for a duration of time on a hop frequency or narrow band of frequencies indicated by a paging formula, wherein defining the PFW comprises determining an identifier based on the paging formula and, after determining the identifier, modifying at least one bit of the identifier to a fixed bit value, the identifier mapping to the hop frequency or one of the narrow band of frequencies; and

periodically waking up the UE to monitor the PFW for a page message received on the unlicensed spectrum.

2. The method of monitoring paging occasions according to claim 1 , wherein the PFW is monitored for a duration of a dwell time per hop on each frequency.

3. The method of monitoring paging occasions according to claim 1 , wherein the PFW is monitored for a duration of N frames.

4. The method according to claim 3 , comprising:

receiving a frame structure information at the start of at least one frame, wherein the at least one frame of one hop frequency has at least one downlink-uplink transition.

5. The method according to claim 4 , wherein the frame structure is dynamic.

6. The method according to claim 3 , further comprising:

monitoring a longest continuous downlink subframe duration within a frame of the PFW for the paging occasions.

7. The method according to claim 3 , further comprising: monitoring all downlink subframes in each downlink portion of a frame of the PFW.

8. The method according to claim 3 , wherein a subframe where the UE starts monitoring paging is uniquely defined for each frame structure.

9. The method according to claim 1 , wherein a formula used to select the hop frequency is the paging formula used to calculate a paging frame.

10. The method according to claim 9 , wherein the paging formula used to select the hop frequency is

SFN mod T=(T/N)*(UE_ID mod N), wherein T is a duration of an extended discontinuous reception (eDRX) cycle, wherein N is a number of frames, and wherein UE_ID is an identifier of the UE.

11. The method according to claim 1 , wherein the PFW is monitored over the narrow band of frequencies.

12. The method according to claim 11 , wherein the narrow band of frequencies is dynamic.

13. The method of claim 1 , wherein an eDRX cycle is either cell-specific or UE specific.

14. The method of monitoring paging occasions according to claim 1 , further comprising:

adding at least one additional high priority message to be carried in the paging message.

15. The method according to claim 14 , wherein the at least one additional high priority message includes changing of at least one frequency hopping list including a number of hopping channels.

16. The method according to claim 14 , wherein the at least one additional high priority message includes changing of anchor channel information used for DRS transmissions.

17. The method of monitoring paging occasions according to claim 1 , further comprising:

reading an information block which indicates at least one of whether paging is present in a frame, and control format to be assumed for paging:

decoding a physical downlink shared channel (PDSCH) scrambled with paging-radio network temporary identifiers (P-RNTI) to receive the paging message if the paging message is present; and

skipping the frame if the paging message is not present.

18. The method of claim 1 , wherein the fixed bit value is zero.

19. The method of claim 1 , wherein modifying the at least one bit comprises modifying three least significant bits of the identifier.

20. The method of claim 1 , wherein modifying the at least one bit comprises modifying two least significant bits of the identifier.

21. The method of claim 1 , wherein a number of bits of the at least one bit are based on a carrier frequency.

22. A wireless communication device to monitor paging occasions on unlicensed spectrum, comprising:

a memory;

a radio frequency (RF) resource; and

a processor coupled to the memory and the RF resource, the processor configured to:

define, at a user equipment (UE), a paging frame window (PFW) for a duration of time on a hop frequency or narrow band of frequencies indicated by a paging formula, wherein defining the PFW comprises determining an identifier based on the paging formula and, after determining the identifier, modifying at least one bit of the identifier to a fixed bit value, the identifier mapping to the hop frequency or one of the narrow band of frequencies; and

periodically wake up the UE to monitor the PFW for a page message received on the unlicensed spectrum.

23. The wireless communication device of claim 22 , wherein the PFW is monitored for a duration of a dwell time per hop on each frequency.

24. The wireless communication device of claim 22 , wherein the PFW is monitored for a duration of N frames.

25. The wireless communication device according to claim 24 , comprising:

receiving frame structure information at the start of at least one frame, wherein the at least one frame of one hop frequency has at least one downlink-uplink transition.

26. The wireless communication device according to claim 25 , wherein the frame structure is dynamic.

27. The wireless communication device of claim 22 , wherein a formula used to select the hop frequency is the paging formula used to calculate a paging frame.

28. The wireless communication device according to claim 27 , wherein the paging formula used to select the hop frequency is

SFN mod T=(T/N)*(UE_ID mod N), wherein T is a duration of an extended discontinuous reception (eDRX) cycle, wherein N is a number of frames, and wherein UE_ID is an identifier of the UE.

29. A wireless communication device to monitor paging occasions on unlicensed spectrum, comprising:

means for defining, at a user equipment (UE), a paging frame window (PFW) for a duration of time on a hop frequency or narrow band of frequencies indicated by a paging formula, wherein defining the PFW comprises determining an identifier based on the paging formula and, after determining the identifier, modifying at least one bit of the identifier to a fixed bit value, the identifier mapping to the hop frequency or one of the narrow band of frequencies; and

means for periodically waking up the UE to monitor the PFW for a page message received on the unlicensed spectrum.

30. A non-transitory processor-readable storage medium having stored thereon processor-executable instructions configured to cause a processor of a mobile communication device to monitor paging occasions on unlicensed spectrum by performing operations comprising:

defining, at a user equipment (UE), a paging frame window (PFW) for a duration of time on a hop frequency or narrow band of frequencies indicated by a paging formula, wherein defining the PFW comprises determining an identifier based on the paging formula and, after determining the identifier, modifying at least one bit of the identifier to a fixed bit value, the identifier mapping to the hop frequency or one of the narrow band of frequencies; and

periodically waking up the UE to monitor the PFW for a page message received on the unlicensed spectrum.