DMRS for 5G things communication system

1. A user equipment device (UE), comprising:

memory; and

processing circuitry in communication with the memory and configured to cause the UE to:

randomize Demodulation Reference Signal (DMRS) locations of a DMRS in a resource unit (RU) of a Physical Resource Allocation (PRA) of a shared channel for transmission to an other UE, wherein the DMRS locations are determined based on a temporary ID of the UE;

generate DMRS sequences for transmission to the other UE in the DMRS locations; and

in response to transmission of the DMRS, decode information received from the other UE based on characteristics of received DMRS transmissions.

2. The UE of claim 1 ,

wherein the DMRS sequences are random sequences defined by one of a length-31 Gold sequence or a Zadoff-Chu sequence.

3. The UE of claim 2 ,

wherein each random sequence is mapped onto M-ary phase shift keying (MPSK) signal modulation.

4. The UE of claim 2 ,

wherein respective RUs of the PRA comprise respective pairs of DMRS having a transmission power higher than that of data signals in a first RU of another PRA in the shared channel.

5. The UE of claim 2 ,

wherein the processing circuitry is further configured to cause the UE to:

replicate the DMRS locations every predetermined number of subframes; and

configure the predetermined number of subframes by higher layer signaling or by broadcast as a configuration parameter.

6. The UE of claim 2 ,

wherein the processing circuitry is further configured to cause the UE to:

replicate the DMRS locations every predetermined number of RUs of the shared channel in a subframe; and

configure the predetermined number of RUs by higher layer signaling or by broadcast as a configuration parameter.

7. The UE of claim 6 ,

wherein the predetermined number is an integer greater than 1.

8. The UE of claim 2 ,

wherein the shared channel is a shared data channel and the processing circuitry is further configured to cause the UE to:

condition transmission of the DMRS based on at least one of a collision or contention probability, wherein the at least one of the collision or contention probability is based on at least one of a number of other UEs in a personal area network (PAN) associated with the UE or a density of neighboring PANs associated with other UEs; and

in response to a determination that the at least one of the collision or contention probability is less than a predetermined value, avoid use of the shared data channel for transmission of the DMRS.

9. The UE of claim 2 ,

wherein the other UE is a wearable UE, and wherein the processing circuitry is further configured to cause the UE to communicate data from the other UE to a base station.

10. The UE of claim 2 ,

wherein the processing circuitry is further configured to cause the UE to:

determine whether any other UE is associated with the UE to form a personal area network (PAN); and

in response to a determination that the UE is unassociated with the other UE, avoid transmission of the DMRS.

11. The UE of claim 2 ,

wherein the shared channel comprises at least one of a common control channel, a Transmitter resource Acquisition and Sounding (TAS) channel, a Receiver resource Acknowledgement and Sounding (RAS) channel, or an acknowledgment (ACK) channel.

12. The UE of claim 2 ,

wherein the DMRS locations are disposed on at least one of different subcarriers or symbols in the RU.

13. The UE of claim 2 ,

wherein the processing circuitry comprises a baseband processor; and

wherein the UE further comprises a transceiver configured to communicate with the other UE.

14. An apparatus, comprising:

memory; and

a processor in communication with the memory and configured to cause a user equipment device (UE) to:

detect a Demodulation Reference Signal (DMRS) received from an other UE, wherein the DMRS are random sequences and disposed at locations in a resource unit (RU) of a Physical Resource Allocation (PRA) of a shared channel, wherein the locations are determined based on a temporary ID of the other UE;

measure the DMRS; and

encode channel quality information based on the measured DMRS for transmission to the other UE.

15. The apparatus of claim 14 ,

wherein respective RUs of the PRA comprise respective pairs of DMRS having a transmission power higher than that of data signals in a first RU of another PRA in the shared channel.

16. The apparatus of claim 14 ,

wherein the locations are disposed on at least one of different subcarriers or symbols in the RU.

17. The apparatus of claim 14 ,

wherein the locations are repeated at a predetermined number of subframes; and

wherein the processor is further configured to cause the UE to detect the predetermined number of subframes from one of higher layer signaling or as a configuration parameter in a broadcast.

18. The apparatus of claim 14 ,

wherein the locations are repeated at a predetermined number of RUs of the shared channel in a subframe; and

wherein the processor is further configured to cause the UE to detect the predetermined number of RUs is from one of: higher layer signaling or as a configuration parameter in a broadcast.

19. The apparatus of claim 18 ,

wherein the predetermined number is an integer greater than 1.

20. The apparatus of claim 14 ,

wherein the apparatus is a wearable UE; and

wherein the processor is further configured to cause the UE to communicate data through the other UE to a base station.

21. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a user equipment (UE), the one or more processors to:

randomize-Demodulation Reference Signal (DMRS) locations of a DMRS in a resource unit (RU) of a Physical Resource Allocation (PRA) of a shared channel for transmission to an other UE, wherein the DMRS locations are determined based on a temporary ID of the UE;

generate DMRS sequences for transmission to the other UE in the DMRS locations; and

in response to transmission of the DMRS, decode information received from the other UE based on characteristics of received DMRS transmissions.

22. The non-transitory computer-readable storage medium of claim 21 ,

wherein the DMRS locations are disposed on at least one of different subcarriers or symbols in the RU.

23. The non-transitory computer-readable storage medium of claim 21 ,

wherein the DMRS sequences are random sequences defined by one of a length-31 Gold sequence or a Zadoff-Chu sequence.

24. The non-transitory computer-readable storage medium of claim 21 ,

wherein the instructions are further executable to configure the one or more processors to:

replicate the DMRS locations every predetermined number of subframes, and

configure the predetermined number of subframes by higher layer signaling or broadcast as a configuration parameter.

25. The non-transitory computer-readable storage medium of claim 21 ,

wherein the instructions are further executable to configure the one or more processors to:

replicate the DMRS locations every predetermined number of RUs of the shared channel in a subframe, wherein the predetermined number is an integer greater than 1, and

configure the predetermined number of RUs by higher layer signaling or broadcast as a configuration parameter.

26. The non-transitory computer-readable storage medium of claim 21 ,

wherein the instructions are further executable to configure the one or more processors to:

condition transmission of the DMRS based on at least one of a collision or contention probability, the at least one of a collision or contention probability based on at least one of a number of other UEs in a personal area network (PAN) associated with the UE or a density of neighboring PANs associated with other UEs; and

in response to a determination that the at least one of the collision or contention probability is less than a predetermined value, avoid use of the shared channel for transmission of the DMRS.