TS 38.201 NR; Physical layer; General description (Release 18)

发表于 | 分类于

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。

PHY层标准

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。

不同层关系

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 measurements for 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.

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.