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US 11,606,173 B2Granted
System and scheme of scalable OFDM numerology
AssigneeHuawei Technologies Co., Ltd.
InventorsLiqing Zhang, Kelvin Kar Kin Au, Jianglei Ma, Wen Tong, Toufiqul Islam
Life of this patent
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Abstract
For a wireless communications system, scalable orthogonal frequency division multiplexing (OFDM) numerology is incorporated in a manner that can apply to radio link transmissions in future wireless network for frequency division duplex (FDD) and time division duplex (TDD) communications.
Claims22
A method comprising:
- receiving, by an apparatus, an indication of a subcarrier spacing associated with a transmission time unit, TTU;
- and
- transmitting or receiving, by the apparatus, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
- wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2n multiple of 15 kHz, where n is a positive integer and 2n is a scaling factor, and
- wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs, where ½n is a reciprocal of the 2n scaling factor, and
- wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs.
3 more elements
An apparatus comprising:
- a memory storing instructions;
- and
- a processor configured, by the instructions, to:
- receive an indication of a subcarrier spacing associated with a transmission time unit, TTU;
- and
- transmit or receive, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
- wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2n multiple of 15 kHz, where n is a positive integer and 2n is a scaling factor, and
- wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs, where ½n is a reciprocal of the 2n scaling factor, and
- wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs.
6 more elements
A non-transitory computer readable medium storing instructions which, when the instructions are executed by a computer, cause the computer to:
- receive an indication of a subcarrier spacing associated with a transmission time unit, TTU;
- and
- transmit or receive, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
- wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2n multiple of 15 kHz, where n is a positive integer and 2n is a scaling factor, and
- wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs, where ½n is a reciprocal of the 2n scaling factor, and
- wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs.
3 more elements
A method comprising:
- transmitting, by an apparatus, an indication of a subcarrier spacing associated with a transmission time unit, TTU, to a user equipment;
- and
- transmitting or receiving, by the apparatus with the user equipment, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
- wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2n multiple of 15 kHz, where n is a positive integer and 2n is a scaling factor, and
- wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs, where ½n is a reciprocal of the 2n scaling factor, and
- wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs.
3 more elements
An apparatus comprising:
- a memory storing instructions;
- and
- a processor configured, by the instructions, to:
- transmit an indication of a subcarrier spacing associated with a transmission time unit, TTU, to a user equipment;
- and
- transmit or receive with the user equipment, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
- wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2n multiple of 15 kHz, where n is a positive integer and 2n is a scaling factor, and
- wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs, where ½n is a reciprocal of the 2n scaling factor, and
- wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs.
6 more elements
A non-transitory computer readable medium storing instructions which, when the instructions are executed by a computer, cause the computer to:
- transmit an indication of a subcarrier spacing associated with a transmission time unit, TTU, to a user equipment;
- and
- transmit or receive with the user equipment, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
- wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2n multiple of 15 kHz, where n is a positive integer and 2n is a scaling factor, and
- wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs, where ½n is a reciprocal of the 2n scaling factor, and
- wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½n multiple of 2048*1/30.72 μs.
3 more elements
Dependencies are inferred from the claim text.