EN301 893v1.8.0：5GHz DFS测试标准覆盖5.25-5.725GHz频段

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EN301 893v1.8.0 是一项欧洲协调标准，针对的是宽带无线接入网络（BRAN）中的5GHz高频性能无线局域网（WLAN）。这个版本的规范于2015年1月发布，重点关注动态频谱共享（Dynamic Frequency Sharing, DFS）测试内容，这是根据欧盟无线电和电信设备指令（Radio and Telecommunications Terminal Equipment Directive, R&TTE）的第3.2条进行的必要要求。 DFS是确保5.25-5.35GHz和5.47-5.725GHz这两个频段内的无线通信系统能够与地面站、卫星等其他可能产生的干扰有效共存的一项技术。在EN301 893中，它涵盖了测试层面1（Layer 1）的技术要求，涉及到无线访问、宽带网络、无线电监管和严格的测试程序，旨在确保这些频率的高效、安全和无干扰的使用。该标准的主要目的是为了保证在利用5GHz频段进行商业和家庭无线网络部署时，设备之间的兼容性和互操作性，同时减少对传统广播、电视和其他地面服务的潜在干扰。ETSI（欧洲电信标准化协会）作为制定者，提供了详细的参考文档（REN/BRAN-0060011），并强调了任何电子或打印版本的更新必须得到ETSI的书面授权。 EN301 893v1.8.0不仅适用于制造商设计和生产符合标准的无线设备，也适用于网络运营商在部署和优化其WLAN服务时遵循，以确保网络合规性和服务质量。此外，用户在购买和使用此类设备时，应确保它们已通过EN301 893的测试，以保证在规定的频谱范围内能稳定、高效地运行。 EN301 893v1.8.0是无线通信行业中一个重要的指导性标准，对于维护5GHz频段的正常运作，保障网络安全，以及促进全球范围内的互操作性都起到了关键作用。任何涉及到5GHz DFS技术的开发者、运营商和服务提供商都应当密切关注并遵循此标准。

ETSI

Final draft ETSI EN 301 893 V1.8.0 (2015

01)

4.4.2 Limits

4.4.2.1 General

The limits below are applicable to the system as a whole and in any possible configuration. This includes smart antenna

systems (devices with multiple transmit chains).

In case of multiple (adjacent or non-adjacent) channels within the same sub-band, the total RF output power of all

channels in that sub-band shall not exceed the limits defined below.

In case of multiple, non-adjacent channels operating in separate sub-bands, the total RF output power in each of the

sub-bands shall not exceed the limits defined below.

4.4.2.2 Limits for RF output power and power density at the highest power level

TPC is not required for channels whose nominal bandwidth falls completely within the band 5 150 MHz to 5 250 MHz.

For devices with TPC, the RF output power and the power density when configured to operate at the highest stated

power level of the TPC range shall not exceed the levels given in table 1.

Devices are allowed to operate without TPC. See table 1 for the applicable limits in this case.

Table 1: Mean e.i.r.p. limits for RF output power and power density at the highest power level

Frequency

range

[MHz]

Mean e.i.r.p. limit

[dBm]

Mean e.i.r.p. density limit

[dBm/MHz]

with TPC

without TPC

with TPC

without TPC

5 150 to 5 350 23 20/23 (see note 1) 10 7/10 (see note 2)

5 470 to 5 725 30 (see note 3) 27 (see note 3) 17 (see note 3) 14 (see note 3)

NOTE 1: The applicable limit is 20 dBm, except for transmissions whose nominal bandwidth falls

completely within the band 5 150 MHz to 5 250 MHz, in which case the applicable limit is

23 dBm.

NOTE 2: The applicable limit is 7 dBm/MHz, except for transmissions whose nominal bandwidth falls

completely within the band 5 150 MHz to 5 250 MHz, in which case the applicable limit is

10 dBm/MHz.

NOTE 3: Slave devices without a Radar Interference Detection function shall comply with the limits for the

band 5 250 MHz to 5 350 MHz.

4.4.2.3 Limit for RF output power at the lowest power level of the TPC range

For devices using TPC, the RF output power during a transmission burst when configured to operate at the lowest stated

power level of the TPC range shall not exceed the levels given in table 2. For devices without TPC, the limits in table 2

do not apply.

Table 2: Mean e.i.r.p. limits for RF output power

at the lowest power level of the TPC range

Frequenc

y range

Mean e.i.r.p. [dBm]

5 250 MHz to 5 350 MHz 17

5 470 MHz to 5 725 MHz 24 (see note)

NOTE: Slave devices without a Radar Interference Detection function

shall comply with the limits for the band 5 250 MHz to 5 350 MHz.

4.4.3 Conformance

Conformance tests as defined in clause 5.3.4 shall be carried out.

ETSI

Final draft ETSI EN 301 893 V1.8.0 (2015

01)

4.5.2.2 Limits

NOTE: dBc is the spectral density relative to the maximum spectral power density of the transmitted signal.

Figure 1: Transmit spectral power mask

The average level of transmitter unwanted emissions within the 5 GHz RLAN bands shall not exceed the limit of the

mask provided in figure 1 or the limit for unwanted emissions provided in table 3, whichever is the higher.

The mask is only applicable within the band of operation. Beyond the band edges the requirements of clause 4.5.1

apply.

In case of smart antenna systems (devices with multiple transmit chains) each of the transmit chains shall meet this

requirement.

For transmitter unwanted emissions within the 5 GHz RLAN bands, simultaneous transmissions in adjacent channels

may be considered as one signal with an actual Nominal Channel Bandwidth of "n" times the individual Nominal

Channel Bandwidth where "n" is the number of adjacent channels used simultaneously.

For simultaneous transmissions in multiple non-adjacent channels, the overall transmit spectral power mask is

constructed in the following manner. First, a mask as provided in figure 1 is applied to each of the channels. Then, for

each frequency point, the highest value from the spectral masks of all the channels assessed shall be taken as the overall

spectral mask requirement at that frequency.

4.5.2.3 Conformance

Conformance tests as defined in clause 5.3.6 shall be carried out.

4.6 Receiver spurious emissions

4.6.1 Definition

Receiver spurious emissions are emissions at any frequency when the equipment is in receive mode.

4.6.2 Limits

The spurious emissions of the receiver shall not exceed the limits given in table 4.

In case of equipment with antenna connectors, these limits apply to emissions at the antenna port (conducted) and to the

emissions radiated by the cabinet. In case of integral antenna equipment (without temporary antenna connectors), these

limits apply to emissions radiated by the equipment.

ETSI

Final draft ETSI EN 301

893 V1.8.0 (2015

01)

Table 4: Spurious radiated emission limits

Frequency range

Maximum power

Measurement bandwidth

30 MHz to 1 GHz -57 dBm 100 kHz

1 GHz to 26 GHz -47 dBm 1 MHz

4.6.3 Conformance

Conformance tests as defined in clause 5.3.7 shall be carried out.

4.7 Dynamic Frequency Selection (DFS)

4.7.1 Introduction

4.7.1.1 General

An RLAN shall employ a Dynamic Frequency Selection (DFS) function to:

• detect interference from radar systems (radar detection) and to avoid co-channel operation with these systems;

• provide on aggregate a near-uniform loading of the spectrum (Uniform Spreading).

The DFS function as described in the present document is not tested for its ability to detect frequency hopping radar

signals.

Whilst the DFS function described in this clause defines conditions under which the equipment may transmit,

transmissions are only allowed providing they are not prohibited by the Adaptivity requirement in clause 4.8.

4.7.1.2 Applicable frequency range

Radar detection is required when operating on channels whose nominal bandwidth falls partly or completely within the

frequency ranges 5 250 MHz to 5 350 MHz or 5 470 MHz to 5 725 MHz. This requirement applies to all types of

RLAN devices regardless of the type of communication between these devices.

Uniform Spreading is required across the frequency ranges 5 150 MHz to 5 350 MHz and 5 470 MHz to 5 725 MHz.

Uniform Spreading is not applicable for equipment that only operates in the band 5 150 MHz to 5 250 MHz.

4.7.1.3 DFS operational modes

Within the context of the operation of the DFS function, an RLAN device shall operate as either a master or a slave.

RLAN devices operating as a slave shall only operate in a network controlled by an RLAN device operating as a

master. A device which is capable of operating as either a master or a slave shall comply with the requirements

applicable to the mode in which it operates.

Some RLAN devices are capable of communicating in ad-hoc manner without being attached to a network. RLAN

devices operating in this manner on channels whose nominal bandwidth falls partly or completely within the frequency

ranges 5 250 MHz to 5 350 MHz or 5 470 MHz to 5 725 MHz shall employ DFS and shall be tested against the

requirements applicable to a master.

Slave devices used in fixed outdoor point to point or fixed outdoor point to multipoint applications shall behave as slave

with radar detection independent of their output power. See table 5.

4.7.1.4 DFS operation

The operational behaviour and individual DFS requirements that are associated with master and slave devices are as

follows:

Master devices:

a) The master device shall use a Radar Interference Detection function in order to detect radar signals.

The master device may rely on another device, associated with the master, to implement the Radar Interference

Detection function. In such a case, the combination shall comply with the requirements applicable to a master.

ETSI

Final draft ETSI EN 301 893 V1.8.0 (2015

01)

b) A master device shall only start operations on Available Channels. At installation (or reinstallation) of the

equipment, the RLAN is assumed to have no Available Channels within the band 5 250 MHz to 5 350 MHz

and/or 5 470 MHz to 5 725 MHz. In such a case, before starting operations on one or more of these channels,

the master device shall perform either a Channel Availability Check or an Off-Channel CAC to ensure that

there are no radars operating on any selected channel. If no radar has been detected, the channel(s) becomes an

Available Channel(s) and remains as such until a radar signal is detected during the In-Service Monitoring.

The Channel Availability Check or the Off-Channel CAC may be performed over a wider bandwidth such that

all channels within the tested bandwidth become Available Channels.

NOTE 1: The initial Channel Availability Check may be activated manually at installation or reinstallation of the

equipment.

c) Once the RLAN has started operations on an Available Channel, then that channel becomes an Operating

Channel. During normal operation, the master device shall monitor all Operating Channels (In-Service

Monitoring) to ensure that there is no radar operating within these channel(s). If no radar was detected on an

Operating Channel but the RLAN stops operating on that channel, then the channel becomes an Available

Channel.

NOTE 2: An RLAN is allowed to start transmissions on multiple (adjacent or non-adjacent) Available Channels.

In this case all these channels become Operating Channels.

d) If the master device has detected a radar signal on an Operating Channel during In-Service Monitoring, the

master device shall instruct all its associated slave devices to stop transmitting on this channel which becomes

an Unavailable Channel. When operating on multiple (adjacent or non-adjacent) Operating Channels

simultaneously, only the Operating Channel containing the frequency on which radar was detected shall

become an Unavailable Channel.

e) An Unavailable Channel can become a Usable Channel again after the Non-Occupancy Period. A new

Channel Availability Check or an Off-Channel CAC is required to verify there is no radar operating on this

channel before it becomes an Available Channel again.

f) In all cases, if radar detection has occurred, then the channel containing the frequency on which radar was

detected becomes an Unavailable Channel. Alternatively, the channel may be marked as an Unusable

Channel.

Slave devices:

a) A slave device shall not transmit before receiving an appropriate enabling signal from an associated master

device.

b) A slave device shall stop its transmissions on a channel whenever instructed by a master device. The slave

device shall not resume any transmissions on this channel until it has received an appropriate enabling signal

from an associated master device.

c) A slave device which is required to perform radar detection (see table D.2, note 2), shall stop its own

transmissions on an

Operating Channel if

it has detected a radar on that channel. That Operating Channel

becomes an Unavailable Channel for the slave device. It shall not resume any transmissions on this

Unavailable Channel for a period of time equal to the Non-Occupancy Period. A Channel Availability Check

or an Off-Channel CAC is required by the slave device to verify there is no radar operating on this channel

before the slave may use it again.

4.7.2 DFS technical requirements specifications

4.7.2.1 Applicability

Table 5 lists the DFS related technical requirements and their applicability for every operational mode. If the RLAN

device is capable of operating in more than one operational mode then every operating mode shall be assessed

separately.

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