Multi-subcarrier system with multiple numerologies
A method of operating a user equipment comprises addressing multi-subcarrier system resources using multiple different numerologies available within a single carrier, the multiple different numerologies comprising a first numerology having resource blocks (RBs) with a first bandwidth and a first subcarrier spacing, Δf1, and a second numerology having RBs with a second bandwidth and a second subcarrier spacing, Δf2, which is different from Δf1, wherein the first numerology is aligned in the frequency domain relative to a frequency reference, Fref, according to m*Δf1+Fref and the second numerology is aligned in the frequency domain relative to the frequency reference, Fref, according to n*Δf2+Fref, where m and n are integers. The method further comprises transmitting and/or receiving information within the single carrier according to the at least one of the multiple different numerologies.
1. A method of operating a radio access node, comprising:
addressing multi-subcarrier system resources using multiple different numerologies within a single carrier, wherein the multiple different numerologies comprise a first numerology having resource blocks (RBs) with a first bandwidth and a first subcarrier spacing, Δf1, and a second numerology having RBs with a second bandwidth and a second subcarrier spacing, Δf2, which is different from Δf1, and wherein the first numerology is aligned in the frequency domain relative to a frequency reference, Fref, according to m*Δf1+Fref and the second numerology is aligned in the frequency domain relative to the frequency reference, Fref, according to n*Δf2+Fref, where m and n are integers; and
transmitting and/or receiving information within the single carrier according to the multiple different numerologies.
2. The method of claim 1 wherein subcarriers of allocated RBs of the first numerology are separated from subcarriers of allocated RBs of the second numerology by a frequency gap having a size that is a function of Δf1 or Δf2.
3. The method of claim 1 , wherein the first subcarrier spacing, Δf1, is related to the second subcarrier spacing Δf2 by an integer scaling factor N such that Δf2=N*Δf1.
4. The method of claim 3 , wherein Δf1=15 kHz and Δf2=30 kHz.
5. The method of claim 1 , wherein the single carrier has a bandwidth of approximately 10 MHz or 20 MHz.
6. The method of claim 1 , wherein the multi-subcarrier system is an orthogonal frequency division multiplexing (OFDM) system.
7. The method of claim 6 , wherein the multi-subcarrier system is a pre-coded multi-subcarrier system.
8. The method of claim 7 , wherein the precoded multi-subcarrier system is a discrete Fourier transform (DFT) spread OFDM (DFTS-OFDM) system.
9. The method of any of claim 1 , further comprising transmitting first and second integers B and D indicating a start frequency relative to a frequency reference and width of a first numerology among the multiple different numerologies, wherein the start frequency is defined according to B*K1*Δf, and the bandwidth of the first numerology is defined according to D*K1*Δf, wherein K1 denotes a bandwidth of a smallest addressable unit of the first numerology, expressed in units of a smallest subcarrier spacing of numerologies of the single carrier, and wherein Δf denotes the smallest subcarrier spacing.
10. The method of claim 9 , further comprising transmitting third and fourth integers A and C indicating a start frequency relative to a frequency reference and width of a second numerology among the multiple different numerologies, wherein the start frequency of the second numerology is defined according to Δ*K2*Δf, and the bandwidth of the second numerology is defined according to C*K2*Δf, wherein K2 denotes a bandwidth of a smallest addressable unit of the second numerology, expressed in units of the smallest subcarrier spacing of numerologies of the single carrier.
11. A radio access node, comprising:
processing circuitry and memory collectively configured to address multi-subcarrier system resources using multiple different numerologies within a single carrier, wherein the multiple different numerologies comprise a first numerology having resource blocks (RBs) with a first bandwidth and a first subcarrier spacing, Δf1, and a second numerology having RBs with a second bandwidth and a second subcarrier spacing, Δf2, which is different from Δf1, and wherein the first numerology is aligned in the frequency domain relative to a frequency reference, Fref, according to m*Δf1+Fref and the second numerology is aligned in the frequency domain relative to the frequency reference, Fref, according to n*Δf2+Fref, where m and n are integers; and
at least one transmitter and/or receiver configured to transmit and/or receive information within the single carrier according to the multiple different numerologies.
12. The radio access node of claim 11 , wherein subcarriers of allocated RBs of the first numerology are separated from subcarriers of allocated RBs of the second numerology by a frequency gap having a size that is a function of Δf1 or Δf2.
13. The radio access node of any of claim 11 , wherein the first subcarrier spacing, Δf1, is related to the second subcarrier spacing Δf2 by an integer scaling factor N such that Δf2=N*Δf1.
14. The radio access node of claim 13 , wherein Δf1=15 kHz and Δf2=30 kHz.
15. The radio access node of any of claim 11 , wherein the single carrier has a bandwidth of approximately 10 MHz or 20 MHz.
16. The radio access node of any of claim 11 , wherein the multi-subcarrier system is an orthogonal frequency division multiplexing (OFDM) system.
17. The radio access node of claim 16 , wherein the multi-subcarrier system is a precoded multi-subcarrier system.
18. The radio access node of claim 17 , wherein the precoded multi-subcarrier system is a discrete Fourier transform (DFT) spread OFDM (DFTS-OFDM) system.
19. The radio access node of any of claim 11 , wherein the at least one transmitter and/or receiver is further configured to transmit and/or receive first and second integers B and D indicating a start frequency relative to a frequency reference and width of a first numerology among the multiple different numerologies, wherein the start frequency is defined according to B*K1*Δf, and the bandwidth of the first numerology is defined according to D*K1*Δf, wherein K1 denotes a bandwidth of a smallest addressable unit of the first numerology, expressed in units of a smallest subcarrier spacing of numerologies of the single carrier, and wherein Δf denotes the smallest subcarrier spacing.
20. The radio access node of claim 19 , wherein the at least one transmitter and/or receiver is further configured to transmit and/or receive third and fourth integers A and C indicating a start frequency relative to a frequency reference and width of a second numerology among the multiple different numerologies, wherein the start frequency of the second numerology is defined according to A*K2*Δf, and the bandwidth of the second numerology is defined according to C*K2*Δf, wherein K2 denotes a bandwidth of a smallest addressable unit of the second numerology, expressed in units of the smallest subcarrier spacing of numerologies of the single carrier.