PEAK TO AVERAGE POWER RATIO REDUCTION IN ELAA
A method of uplink transmission to reduce peak-to-average power ratio (PAPR) in enhanced licensed assisted access (eLAA) is proposed. New design of Physical Uplink Control Channel (PUCCH) and Physical Uplink Shared Channel (PUSCH) is proposed. Across frequency domain of the channel bandwidth, multiple resource interlaces are allocated for different UEs for uplink PUCCH/PUSCH transmission to satisfy the occupied channel bandwidth requirement for unlicensed carrier access. In addition, uplink transmission with co-phasing terms are applied to reduce PAPR of the resulted waveform.
1 . A method comprising:
obtaining a set of resource blocks for an uplink channel by a user equipment (UE) in an orthogonal frequency division multiplexing (OFDM) wireless communications network, wherein the set of resource blocks is distributed along frequency domain to occupy a predefined percentage of an entire channel bandwidth;
applying a co-phasing vector comprising a set of co-phasing terms, wherein each co-phasing term of the co-phasing vector is applied to a corresponding resource block of the set of resource blocks; and
transmitting a radio signal containing uplink information over the uplink channel applied with the co-phasing vector.
2 . The method of claim 1 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH), wherein the set of resource blocks comprises one physical resource block (PRB) repeated every M PRBs along frequency domain.
3 . The method of claim 1 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH), wherein the set of resource blocks comprises a number of consecutive physical resource blocks (PRBs) spread along frequency domain.
4 . The method of claim 1 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH), wherein the set of resource blocks is uniformly allocated in the entire bandwidth, and wherein each physical resource block (PRB) is spread along frequency domain.
5 . The method of claim 1 , wherein the uplink channel is a Physical Uplink Shared Channel (PUSCH), and wherein the PUSCH resources comprises interleaved physical resource blocks (PRBs).
6 . The method of claim 1 , wherein the co-phasing vector is applied to reduce a peak to average power ratio (PAPR) of the radio signal.
7 . The method of claim 1 , wherein the co-phasing vector comprises a number of demodulation reference signal (DMRS) coefficients.
8 . A user equipment (UE) comprising:
a configuration circuit that obtains a set of resource blocks for an uplink channel by a user equipment (UE) in an orthogonal frequency division multiplexing (OFDM) wireless communications network, wherein the set of resource blocks is distributed along frequency domain to occupy a predefined percentage of an entire channel bandwidth;
an OFDM circuit that applies a co-phasing vector comprising a set of co-phasing terms, wherein each co-phasing term of the co-phasing vector is applied to a corresponding resource block of the set of resource blocks; and
a radio frequency (RF) transmitter that transmits a radio signal containing uplink control information over the PUCCH applied with the co-phasing vector.
9 . The UE of claim 8 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH), wherein the PUCCH resource comprises one physical resource block (PRB) repeated every M PRBs along frequency domain.
10 . The UE of claim 8 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH), wherein the set of resource blocks comprises a number of consecutive physical resource blocks (PRBs) spread along frequency domain.
11 . The UE of claim 8 , wherein the uplink channel is a Physical Uplink Control Channel (PUCCH), wherein the set of resource blocks is uniformly allocated in the entire bandwidth, and wherein each physical resource block (PRB) is spread along frequency domain.
12 . The UE of claim 8 , wherein the uplink channel is a Physical Uplink Shared Channel (PUSCH), and wherein the PUSCH resources comprises interleaved physical resource blocks (PRBs).
13 . The UE of claim 8 , wherein the co-phasing vector is applied to reduce a peak to average power ratio (PAPR) of the radio signal.
14 . The UE of claim 8 , wherein the co-phasing vector comprises a number of demodulation reference signal (DMRS) coefficients.
15 . A method comprising:
allocating a first set of resource blocks to a first user equipment (UE) by a base station in an orthogonal frequency division multiplexing (OFDM) wireless communications network;
allocating a second set of resource blocks to a second UE by the base station, wherein the first and the second sets of resource blocks comprise interleaved PRBs forming interlaces along frequency domain, wherein each interlace occupies a predefined percentage of an entire channel bandwidth; and
simultaneously scheduling the first UE and the second UE for uplink transmission over the first set of resource blocks and the second set of resource blocks respectively.
16 . The method of claim 15 , wherein the first and the second set of resource blocks form a first and a second Physical Uplink Control Channels (PUCCHs).
17 . The method of claim 15 , wherein the first and the second set of resource blocks form a first and a second Physical Uplink Shared Channels (PUSCHs).
18 . The method of claim 15 , wherein the first set of resource blocks is applied with a first co-phasing vector for uplink transmission by the first UE, wherein the second set of resource blocks is applied with a second co-phasing vector for uplink transmission by the second UE.
19 . The method of claim 18 , wherein each co-phasing vector comprises a set of co-phasing terms, wherein each co-phasing term is applied to a corresponding resource block of each set of resource blocks.
20 . The method of claim 18 , wherein each co-phasing vector comprises a set of demodulate reference signal (DMRS) coefficients.