REPEATER AND TRANSMISSION METHOD THEREOF, NETWORK DEVICE, AND COMMUNICATION SYSTEM

1 . A network controlled repeater, comprising:

forwarding processor circuitry; and

communicating processor circuitry configured to:

transmit capability information for discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms to a network device, and

receive control information from the network device via a control link, wherein the network controlled repeater supports cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms for uplink and downlink, an uplink modulation scheme and a downlink modulation scheme; and

the forwarding processor circuitry is further configured to perform forwarding at a backhaul link and/or an access link according to the control information.

2 . The network controlled repeater according to claim 1 , wherein the network controlled repeater does not mandate to support uplink transmission of the discrete Fourier transform spread orthogonal frequency division multiplexing waveforms.

3 . The network controlled repeater according to claim 1 , wherein the uplink modulation scheme includes at least one of QPSK (Quadrature Phase Shift Keying) modulation, or 16QAM (Quadrature Amplitude Modulation) modulation.

4 . The network controlled repeater according to claim 1 , wherein the downlink modulation scheme includes at least one of QPSK modulation, 16QAM modulation or 64QAM modulation for FR1.

5 . The network controlled repeater according to claim 1 , wherein the network controlled repeater supports an initial access and mobility.

6 . The network controlled repeater according to claim 5 , wherein that the network controlled repeater supports an initial access and mobility includes: supporting a random access channel preamble format, and/or, supporting radio resource management measurement based on a synchronization signal block, and/or, supporting reception of a broadcast system information block, and/or, n supporting paging.

7 . The network controlled repeater according to claim 1 , wherein the network controlled repeater supports a multiple-input multiple-output (MIMO) feature.

8 . The repeater according to claim 7 , wherein that the network controlled repeater supports a multiple-input multiple-output feature comprises at least one of the following:

supporting physical downlink shared channel (PDSCH) reception,

supporting a downlink demodulation reference signal (DMRS),

supporting physical uplink shared channel (PUSCH) transmission,

supporting an uplink demodulation reference signal (DMRS),

supporting channel state information (CSI) feedback,

supporting a tracking reference signal,

supporting a sounding reference signal.

9 . The network controlled repeater according to claim 1 , wherein the network controlled repeater supports a downlink control channel and a process feature.

10 . The network controlled repeater according to claim 1 , wherein the network controlled repeater supports an uplink control channel and a process feature.

11 . The network controlled repeater according to claim 1 , wherein the network controlled repeater supports scheduling or hybrid automatic repeat request (HARQ) operation.

12 . The network controlled repeater according to claim 1 , wherein the network controlled repeater supports channel coding.

13 . The network controlled repeater according to claim 1 , wherein the network controlled repeater supports uplink transmit power control (TPC).

14 . A network device comprising:

communicating processor circuitry configured to:

receive capability information for discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms from a network controlled repeater which supports cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms for uplink and downlink, an uplink modulation scheme and a downlink modulation scheme; and

transmit control information to the network controlled repeater via a control link; and

transcribing processor circuitry configured to receive or transmit a forwarded signal on a backhaul link.

15 . A communication system, comprising:

a network device configured to receive capability information for discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms, and transmit control information via a control link; and

a network controlled repeater configured to transmit the capability information for discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveforms to the network device, receive the control information and perform forwarding at a backhaul link and/or an access link according to the control information, wherein the network controlled repeater supports cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveforms for uplink and downlink, an uplink modulation scheme and a downlink modulation scheme.