3GPP TS 38.521-2: 5G NR UE radio transmission and reception specification

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"3GPP TS 38.521-2 是5G NR (New Radio) 用户设备（UE）符合性规范的一部分，主要关注无线电传输和接收，特别是Range 2 Standalone的规范。这份文档是3GPP版本15.0.0的发布，由ETSI（欧洲电信标准协会）于2018年10月制定。" 这篇技术规格详细规定了5G NR网络中UE的无线电收发功能，旨在确保设备与网络之间的互操作性和性能标准。Range 2通常指的是频率范围更广的频段，可能包括毫米波频谱，这些频段在5G网络中用于提供更高的数据传输速率和更低的延迟。文档的主要内容可能涵盖以下几个方面： 1. **物理层规范**：包括调制和编码方案（MCS）、信道编码、同步、信道估计、多址接入方式（如OFDM或SC-FDMA）等。 2. **无线资源管理**：如何分配和使用无线资源块，以及调度策略，以优化网络资源的利用。 3. **射频特性**：定义了UE的射频发射和接收参数，如功率控制、频率误差、相位噪声、载波间隔等。 4. **信道模型和传播特性**：描述了不同环境下的无线传播模型，用于模拟和测试设备在不同场景下的表现。 5. **协议栈接口**：定义了UE与基站（gNB）间的接口，如PHY（物理层）和MAC（媒体访问控制）层之间的接口。 6. **测试用例**：提供了确保UE符合标准的一系列测试条件和测试方法，包括发射机和接收机的性能测试。 7. **安全性**：涵盖与无线链路相关的安全机制，如加密和认证过程。 8. **移动性管理**：涉及UE在不同小区间切换的机制，确保无缝连接。 9. **服务质量（QoS）**：定义了不同服务等级的性能要求，如实时语音、视频流和数据下载。 10. **能量效率**：规定了UE如何在保持高性能的同时，实现能源效率。这份标准文件对于5G NR设备制造商、网络运营商和测试机构至关重要，因为它们确保了所有参与方遵循同一套统一的规则和标准，从而实现全球5G网络的互操作性。对于开发者而言，理解并实施这些规范是开发符合标准的5G设备的关键步骤。

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ETSI

ETSI TS 138 521

2 V15.0.0 (2018

10)

3GPP TS 38.521

2 version 15.0.0 Release 15

5.2A Operating bands for CA

5.2A.1 Intra-band CA

NR intra-band contiguous carrier aggregation is designed to operate in the operating bands defined in Table 5.2A.1-1,

where all operating bands are within FR2.

Table 5.2A.1-1: Intra-band contiguous CA operating bands in FR2

NR CA Band

NR Band

(Table 5.2-1)

CA_n257B n257

CA_n257D n257

CA_n257E n257

CA_n257F n257

CA_n257G n257

CA_n257H n257

CA_n257I n257

CA_n257J n257

CA_n257K n257

CA_n257L n257

CA_n257M n257

CA_n260B n260

CA_n260C n260

CA_n260D n260

CA_n260E n260

CA_n260F n260

CA_n260G n260

CA_n260H n260

CA_n260I n260

CA_n260J n260

CA_n260K n260

CA_n260L n260

CA_n260M n260

CA_n260O n260

CA_n260P n260

CA_n260Q n260

CA_n261B n261

CA_n261C n261

CA_n261D n261

CA_n261E n261

CA_n261F n261

CA_n261G n261

CA_n261H n261

CA_n261I n261

CA_n261J n261

CA_n261K n261

CA_n261L n261

CA_n261M n261

CA_n261O n261

CA_n261P n261

CA_n261Q n261

5.2A.2 Inter-band CA

NR inter-band carrier aggregation is designed to operate in the operating bands defined in Table 5.2A.2-1, where all

operating bands are within FR2.

ETSI

ETSI TS 138

521

2 V15.0.0 (2018

10)

3GPP TS 38.521

2 version 15.0.0 Release 15

Table 5.2A.2-1: Inter-band CA operating bands involving FR2 (two bands)

NR CA Band

NR Band

(Table 5.2-1)

FFS FFS

Editor’s note: The above tables should only cover band combinations where the NR bands are in FR2. More tables

may be added based on the agreed CA band combinations.

5.2D Operating bands for UL-MIMO

NR UL-MIMO is designed to operate in the operating bands defined in Table 5.2D-1.

Table 5.2D-1: NR UL-MIMO operating bands

MIMO operati

ng band

(Table 5.2-1)

n257

5.3 UE Channel bandwidth

5.3.1 General

The UE channel bandwidth supports a single NR RF carrier in the uplink or downlink at the UE. From a BS

perspective, different UE channel bandwidths may be supported within the same spectrum for transmitting to and

receiving from UEs connected to the BS. Transmission of multiple carriers to the same UE (CA) or multiple carriers to

different UEs within the BS channel bandwidth can be supported.

From a UE perspective, the UE is configured with one or more BWP / carriers, each with its own UE channel

bandwidth. The UE does not need to be aware of the BS channel bandwidth or how the BS allocates bandwidth to

different UEs.

The placement of the UE channel bandwidth for each UE carrier is flexible but can only be completely within the BS

channel bandwidth.

5.3.2 Maximum transmission bandwidth configuration

The maximum transmission bandwidth configuration N

for each UE channel bandwidth and subcarrier spacing is

specified in Table 5.3.2-1

Table 5.3.2-1: Maximum transmission bandwidth configuration N

SCS (kHz)

50MHz

100MHz

200MHz

400 MHz

NRB

60 66 132 264 N/A

120 32 66 132 264

5.3.3 Minimum guard band and transmission bandwidth configuration

The minimum guard band for each UE channel bandwidth and SCS is specified in Table 5.3.3-1. The relationship

between the channel bandwidth, the guard band and the transmission bandwidth configuration is shown in Figure 5.3.3-

ETSI

ETSI TS 138 521

2 V15.0.0 (2018

10)

3GPP TS 38.521

2 version 15.0.0 Release 15

In the case that multiple numerologies are multiplexed in the same symbol due to BS transmission of SSB, the

minimum guard band on each side of the carrier is the guard band applied at the configured channel bandwidth for the

numerology that is transmitted immediately adjacent to the guard band.

If multiple numerologies are multiplexed in the same symbol and the UE channel bandwidth is >200MHz, the minimum

guard band applied adjacent to 60 kHz SCS shall be the same as the minimum guard band defined for 120 kHz SCS for

the same UE channel bandwidth.

Figure 5.3.3-3: Guard band definition when transmitting multiple numerologies

NOTE: Figure 5.3.3-3 is not intended to imply the size of any guard between the two numerologies. Inter-

numerology guard band within the carrier is implementation dependent.

The minimum guard band of receiving BS SCS 240 kHz SS/PBCH block for each UE channel bandwidth is specified in

table 5.3.3-2 for FR2.

Table: 5.3.3-2: Minimum guard band (kHz) of SCS 240 kHz SS/PBCH block

SCS

(

kHz

)

100

MHz

200

MHz

400 MHz

240 3800 7720 15560

NOTE: The minimum guard band in Table 5.3.3-2 is applicable only when the SCS 240 kHz SS/PBCH block is

received adjacent to the edge of the UE channel bandwidth within which the SS/PBCH block is located.

5.3.4 RB alignment with different numerologies

For each numerology, its common resource blocks are specified in Section 4.4.4.3 in [9], and the starting point of its

transmission bandwidth configuration on the common resource block grid for a given channel bandwidth is indicated by

an offset to “Reference point A” in the unit of the numerology The indicated transmission bandwidth configuration

must fulfil the minimum guard band requirement specified in Section 5.3.3.

5.3.5 Channel bandwidth per operating band

The requirements in this specification apply to the combination of channel bandwidths, SCS and operating bands shown

in Table 5.3.5-1. The transmission bandwidth configuration in Table 5.3.2-1 shall be supported for each of the specified

channel bandwidths. The channel bandwidths are specified for both the Tx and Rx path.

ETSI

ETSI TS 138 521

2 V15.0.0 (2018

10)

3GPP TS 38.52

2 version 15.0.0 Release 15

Table 5.3.5-1: Channel bandwidths for each NR band

Operating

band / SCS / UE

channel

bandwidth

Operating

band

SCS

kHz

MHz

100

MHz

200

MHz

400

MHz

n257

Yes Yes Yes N/A

120

Yes Yes Yes Yes

n258

Yes Yes Yes N/A

120

Yes Yes Yes Yes

n260

Yes Yes Yes N/A

120

Yes Yes Yes Yes

n261

Yes Yes Yes N/A

120

Yes Yes Yes Yes

5.3A UE channel bandwidth for CA

5.3A.1 General

TBD

5.3A.2 Minimum guard band and transmission bandwidth configuration for

TBD

5.3A.3 RB alignment with different numerologies for CA

TBD

5.3A.4 UE channel bandwidth per operating band for CA

For intra-band contiguous carrier aggregation, a carrier aggregation configuration is a single operating band supporting

a carrier aggregation bandwidth class with associated bandwidth combination sets specified in clause 5.5A.1. For each

carrier aggregation configuration, requirements are specified for all aggregated channel bandwidths contained in a

bandwidth combination set, A UE can indicate support of several bandwidth combination sets per carrier aggregation

configuration.

For intra-band non-contiguous carrier aggregation, a carrier aggregation configuration is a single operating band

supporting two or more sub-blocks, each supporting a carrier aggregation bandwidth class.

For inter-band carrier aggregation, a carrier aggregation configuration is a combination of operating bands, each

supporting a carrier aggregation bandwidth class.

Table 5.3A.4-1: CA bandwidth classes

NR CA bandwidth

class

Aggregated channel bandwidth

Number of contiguous

Fallback group

A BW

Channel

≤

400 MHz 1

B 400 MHz < BW

Channel_CA

≤

800 MHz 2

C 800 MHz < BW

Channel_CA

≤

1200 MHz 3

D 200 MHz < BW

Channel_CA

≤

400 MHz 2

E 400 MHz < BW

Channel_CA

≤

600 MHz 3

F 600 MHz < BW

Channel_CA

≤

800 MHz 4

G 100 MHz < BW

Channel_CA

≤

200 MHz 2

H 200 MHz < BW

Channel_CA

≤

300 MHz 3

I 300 MHz < BW

Channel_CA

≤

400 MHz 4

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