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:
allocating resources of a multi-subcarrier system using a first numerology and a second numerology within a radio-frequency carrier supported within a channel bandwidth of the radio access node, wherein:
the first numerology has resource blocks (RBs) with a first bandwidth and a first subcarrier spacing (Δf1), the RBs of the first numerology starting at a frequency relative to a frequency reference (Fref) according to m*Δf1+Fref, m being an integer,
the second numerology has RBs with a second bandwidth and a second subcarrier spacing (Δf2), the RBs of the second numerology starting at a frequency relative to Fref according to n*Δf2+Fref, n being an integer, and
transmitting and/or receiving information within the single carrier according to the first and second numerologies.
2. The method of claim 1 , wherein:
subcarriers of the first numerology are separated from subcarriers of the second numerology by a frequency gap; and
the frequency gap is inserted between the subcarriers of the first numerology and the subcarriers of the second numerology such the subcarriers of the first and second numerologies are aligned on their respective natural subcarrier grids.
3. The method of claim 2 , wherein the frequency gap is a function of Δf1.
4. The method of claim 2 , wherein the frequency gap is a function of Δf2.
5. 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.
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 pre-coded multi-subcarrier system is a discrete Fourier transform (DFT) spread OFDM system.
9. The method 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 the first numerology, 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 the second numerology, 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.
11. A radio access node, comprising:
processing circuitry in communication with memory having executable instructions thereon; and
at least one transmitter and/or receiver in communication with the processing circuitry and memory and collectively configured to:
allocate multi-subcarrier system resources using a first numerology and a second numerology within a radio-frequency carrier supported within a channel bandwidth of the radio access node, wherein:
the first numerology has resource blocks (RBs) with a first bandwidth and a first subcarrier spacing (Δf1), the RBs of the first numerology starting at a frequency relative to a frequency reference (Fref) according to m*Δf1+Fref, m being an integer,
the second numerology has RBs with a second bandwidth and a second subcarrier spacing (Δf2), the RBs of the second numerology starting at a frequency relative to Fref according to n*Δf2+Fref, n being an integer, and
transmit information within the single carrier according to the first and second numerologies.
12. The radio access node of claim 11 , wherein:
subcarriers of the first numerology are separated from subcarriers of the second numerology by a frequency gap; and
the frequency gap is inserted between the subcarriers of the first numerology and the subcarriers of the second numerology such the subcarriers of the first and second numerologies are aligned on their respective natural subcarrier grids.
13. The radio access node of claim 12 , wherein the frequency gap is a function of Δf1.
14. The radio access node of claim 12 , wherein the frequency gap is a function of Δf2.
15. A user equipment, comprising:
processing circuitry in communication with memory having executable instructions thereon; and
at least one transmitter and/or receiver in communication with the processing circuitry and memory and collectively configured to:
indexing resources of multi-subcarrier system using at least one of a first numerology and a second numerology available within a single RF carrier, wherein:
the first numerology has resource blocks (RBs) with a first bandwidth and a first subcarrier spacing (Δf1), the RBs of the first numerology starting at a frequency relative to a frequency reference (Fref) according to m*Δf1+Fref, m being an integer,
the second numerology has RBs with a second bandwidth and a second subcarrier spacing (Δf2), the RBs of the second numerology starting at a frequency relative to Fref according to n*Δf2+Fref, n being an integer, and
transmitting and/or receiving information within the single carrier according to the at least one of the first and second numerologies.
16. The user equipment of claim 15 , wherein subcarriers of the first numerology are separated from subcarriers of the second numerology by a frequency gap and the frequency gap is a function of Δf1.
17. The user equipment of claim 15 , wherein subcarriers of the first numerology are separated from subcarriers of the second numerology by a frequency gap and the frequency gap is a function of Δf2.
18. The user equipment of claim 15 , wherein subcarriers of indexed RBs of the first numerology are separated from subcarriers of indexed RBs of the second numerology by a frequency gap having a size that is a function of Δf1 or Δf2.
19. The user equipment of claim 15 , wherein Δf1 is related to the Δf2 by an integer scaling factor N such that Δf2=N*Δf1.
20. The user equipment of claim 15 , wherein the multi-subcarrier system is an orthogonal frequency division multiplexing (OFDM) system.