Flexible gaussian minimum shift keying in a cellular internet of things system

Patent metadata

Field	Value
Publication number	US-2016105891-A1
Application number	US-201414510857-A
Country	US
Kind code	A1
Filing date	Oct 9, 2014
Priority date	Oct 9, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

Methods, systems, and devices are described for wireless communication at a UE. A user equipment (UE) may utilize orthogonal frequency division multiple access (OFDMA) for demodulating downlink messages and a combination of Gaussian minimum shift keying (GMSK) and single carrier frequency division multiple access (SC-FDMA) for uplink modulation. The uplink modulation process may include generating a symbol vector with an M-point discrete Fourier transform (DFT), filtering the symbol vector with a frequency domain Gaussian filter, generating a sample vector from the filtered symbol vector utilizing an inverse DFT, and modulating the sample vector utilizing GMSK. In some cases, the uplink modulation may be based on a narrowband resource allocation received from a base station.

First claim

What is claimed is:

1 . A method of wireless communication at a user equipment (UE), comprising:
receiving a narrowband resource allocation from a base station; modulating an outgoing message utilizing Gaussian minimum shift keying (GMSK) and single carrier frequency division multiple access (SC-FDMA) modulation; and transmitting the outgoing message using the narrowband resource allocation.

2 . The method of claim 1 , further comprising:
demodulating an incoming message utilizing orthogonal frequency division multiple access (OFDMA) modulation.

3 . The method of claim 1 , wherein modulating the outgoing message comprises:
generating a symbol vector with an M-point discrete Fourier transform (DFT); filtering the symbol vector with a frequency domain Gaussian filter; generating a sample vector from the filtered symbol vector utilizing an inverse DFT; and modulating the sample vector utilizing GMSK.

4 . The method of claim 1 , wherein the narrowband resource allocation is based on a power limitation of the UE.

5 . The method of claim 1 , wherein a bandwidth of the narrowband resource allocation is a multiple of a smallest narrowband carrier bandwidth.

6 . The method of claim 1 , further comprising:
filtering the outgoing message based on a filter bandwidth that is flexible in the digital domain.

7 . The method of claim 6 , wherein the filter bandwidth is increased proportionally based on a flexible bandwidth allocation.

8 . The method of claim 1 , wherein the narrowband resource allocation is based at least in part on a flexible bandwidth allocation, wherein the flexible bandwidth allocation may be adjusted based on transmit time and data rate.

9 . The method of claim 8 , wherein the flexible bandwidth allocation is based at least in part on a path loss between a base station and the UE.

10 . The method of claim 8 , wherein the transmit time is inversely proportional to the flexible bandwidth allocation.

11 . The method of claim 1 , wherein modulating the outgoing message comprises:
modulating the outgoing message based on a channel condition of the UE.

12 . The method of claim 1 , further comprising:
exchanging data with a network based on machine type communication (MTC) procedures.

13 . An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving a narrowband resource allocation from a base station; means for modulating an outgoing message utilizing Gaussian minimum shift keying (GMSK) and single carrier frequency division multiple access (SC-FDMA) modulation; and means for transmitting the outgoing message using the narrowband resource allocation.

14 . The apparatus of claim 13 , further comprising:
means for demodulating an incoming message utilizing orthogonal frequency division multiple access (OFDMA) modulation.

15 . The apparatus of claim 13 , wherein modulating the outgoing message comprises:
generating a symbol vector with an M-point discrete Fourier transform (DFT); filtering the symbol vector with a frequency domain Gaussian filter; generating a sample vector from the filtered symbol vector utilizing an inverse DFT; and modulating the sample vector utilizing GMSK.

16 . The apparatus of claim 13 , wherein the narrowband resource allocation is based on a power limitation of the UE.

17 . The apparatus of claim 13 , wherein a bandwidth of the narrowband resource allocation is a multiple of a smallest narrowband carrier bandwidth.

18 . The apparatus of claim 13 , further comprising:
means for filtering the outgoing message based on a filter bandwidth that is flexible in the digital domain.

19 . The apparatus of claim 18 , wherein the filter bandwidth is increased proportionally based on a flexible bandwidth allocation.

20 . The apparatus of claim 13 , wherein the narrowband resource allocation is based at least in part on a flexible bandwidth allocation, wherein the flexible bandwidth allocation may be adjusted based on transmit time and data rate.

21 . The apparatus of claim 20 , wherein the flexible bandwidth allocation is based at least in part on a path loss between a base station and the UE.

22 . The apparatus of claim 20 , wherein the transmit time is inversely proportional to the flexible bandwidth allocation.

23 . The apparatus of claim 13 , wherein modulating the outgoing message comprises:
modulating the outgoing message based on a channel condition of the UE.

24 . The apparatus of claim 13 , further comprising:
means for exchanging data with a network based on machine type communication (MTC) procedures.

25 . An apparatus for wireless communication at a user equipment (UE), comprising:
a processor; memory in electronic communication with the processor; and instructions stored in the memory; wherein the instructions are executable by the processor to:
receive a narrowband resource allocation from a base station;
modulate an outgoing message utilizing Gaussian minimum shift keying (GMSK) and single carrier frequency division multiple access (SC-FDMA) modulation; and
transmit the outgoing message using the narrowband resource allocation.

26 . The apparatus of claim 25 , wherein the instructions are executable by the processor to:
demodulate an incoming message utilizing orthogonal frequency division multiple access (OFDMA) modulation.

27 . The apparatus of claim 25 , wherein modulating the outgoing message comprises:
generating a symbol vector with an M-point discrete Fourier transform (DFT); wherein the instructions are executable by the processor to filter the symbol vector with a frequency domain Gaussian filter; generate a sample vector from the filtered symbol vector utilizing an inverse DFT; and modulate the sample vector utilizing GMSK.

28 . The apparatus of claim 25 , wherein the narrowband resource allocation is based on a power limitation of the UE.

29 . The apparatus of claim 25 , wherein a bandwidth of the narrowband resource allocation is a multiple of a smallest narrowband carrier bandwidth.

30 . A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable to:
receive a narrowband resource allocation from a base station; modulate an outgoing message utilizing Gaussian minimum shift keying (GMSK) and single carrier frequency division multiple access (SC-FDMA) modulation; and transmit the outgoing message using the narrowband resource allocation.

Assignees

• Qualcomm Inc

Inventors

• Li Junyi
• Lane Frank Anton

Classifications

• H04W4/005

  Electricity · mapped topic

• H04W72/0453 Primary

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04J11/00

  Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence) · CPC title

• H04J2011/0009

  with FDM/FDMA · CPC title

• H04L5/0044 Primary

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title