3GPP TS38.201 NR； Physical layer； General description （Release 18）

TS38.201是介绍性的标准，简单介绍了RAN的信道组成和PHY层承担的功能，下图是PHY层相关标准的关系。

结构

如图所示，不同层/子层之间的圆圈表示服务接入点(SAP)，其中L2包括MAC，RLC，PDCP和SDAP。

PHY为MAC提供传输信道（信息如何通过无线电接口传输），MAC为RLC提供逻辑信道（所传输信息的类型），RLC为PDCP提供RLC信道，PDCP为上层提供无线承载，SDAP提供QoS Flow级别服务。

信道类型

The physical channels defined in the downlink are:

• the Physical Downlink Shared Channel (PDSCH),
• the Physical Downlink Control Channel (PDCCH),
• the Physical Broadcast Channel (PBCH),

The physical channels defined in the uplink are:

• the Physical Random Access Channel (PRACH),
• the Physical Uplink Shared Channel (PUSCH),
• the Physical Uplink Control Channel (PUCCH).

The physical channels defined in the sidelink are:

• the Physical Sidelink Broadcast Channel (PSBCH),
• the Physical Sidelink Control Channel (PSCCH),
• the Physical Sidelink Feedback Channel (PSFCH),
• the Physical Sidelink Shared Channel (PSSCH).

In addition, signals are defined as reference signals, primary and secondary synchronization signals.

调制方式

The modulation schemes supported are

• in the downlink, QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM,
• in the uplink, QPSK, 16QAM, 64QAM and 256QAM for OFDM with a CP and π/2-BPSK, QPSK, 16QAM,64QAM and 256QAM for DFT-s-OFDM with a CP.

PHY层支持的过程

• Cell search
• Power control
• Uplink synchronisation and Uplink timing control
• Random access related procedures
• HARQ related procedures
• Beam management and CSI related procedures
• Sidelink related procedures
• Channel access procedures

物理层测量

Radio characteristics are measured by the UE and the network and reported to higher layers.
These include, e.g.measurements for intra- and inter-frequency handover, inter RAT handover, timing measurements, and measurementsfor RRM.

其他标准

TS 38.202: Physical layer services provided by the physical layer

• Services and functions of the physical layer;
• Model of physical layer of the UE;
• Parallel transmission of simultaneous physical channels and SRS;
• Measurements provided by the physical layer.5.4

TS 38.211: Physical channels and modulation

• Definition of the uplink, downlink and sidelink physical channels;
• Frame structure and physical resources;
• Modulation mapping (BPSK, QPSK, etc);
• OFDM signal generation;
• Scrambling, modulation and upconversion;
• Layer mapping and precoding;
• Physical shared channel in uplink, downlink and sidelink;
• Reference signal in uplink, downlink and sidelink;
• Physical random access channel;
• Primary and secondary synchronization signals.

TS 38.212: Multiplexing and channel coding

• Channel coding schemes;
• Rate matching;
• Uplink transport channels and control information;
• Downlink transport channels and control information;
• Sidelink transport channels and control information.

TS 38.213: Physical layer procedures for control

• Synchronization procedures;
• Uplink power control;
• Random access procedure;
• UE procedure for reporting control information;
• UE procedure for receiving control information.

TS 38.214: Physical layer procedures for data

• Power control;
• Physical downlink shared channel related procedures;
• Physical uplink shared channel related procedure;
• Physical sidelink shared channel related procedure.

TS 38.215: Physical layer measurements

• Control of UE/NG-RAN measurements;
• Measurement capabilities for NR.

TS 37.213: Physical layer procedures for shared spectrum channel access

• Downlink channel access procedures;
• Uplink channel access procedures;
• Sidelink channel access procedures.