SWRA670A April   2020  – October 2022 CC1350 , CC1352P , CC1352R , CC2400 , CC2420 , CC2430 , CC2500 , CC2520 , CC2530 , CC2538 , CC2540 , CC2541 , CC2543 , CC2544 , CC2545 , CC2564 , CC2590 , CC2591 , CC2592 , CC2620 , CC2630 , CC2640 , CC2650 , CC2652P , CC2652R , CC2652R7 , CC2652RSIP , CC3100 , CC3120 , CC3135 , CC3135MOD , CC3200 , CC3200MOD , CC3220MOD , CC3220MODA , CC3220R , CC3220S , CC3220SF , CC3230S , CC3230SF , CC3235MODAS , CC3235MODASF , CC3235MODS , CC3235MODSF , CC3235S , CC3235SF , WL1801MOD , WL1805MOD , WL1807MOD , WL1831

 

  1.   CE Regulations for SRDs Operating in License-Free 2.4 GHz/5 GHz Bands
  2.   Trademarks
  3. 1 Introduction
  4. 2 Regulation Overview
    1. 2.1 CEPT ERC Recommendation 70-03
  5. 3 Radio Equipment Directive (RED)
    1. 3.1 Essential Requirements
    2. 3.2 Obligations of Manufacturers
    3. 3.3 Conformity of Radio Equipment
      1. 3.3.1 Presumption of Conformity of Radio Equipment
      2. 3.3.2 Conformity Assessment Procedure
      3. 3.3.3 EU Declaration of Conformity
      4. 3.3.4 Rules and Conditions for Affixing the CE Marking
      5. 3.3.5 Technical Documentation
    4. 3.4 Restrictions on Putting into Service
  6. 4 ETSI EN 300 440
    1. 4.1 Technical Requirements
      1. 4.1.1 Environmental Profile
    2. 4.2 Transmitter Requirements
      1. 4.2.1 Transmitter Maximum Radiated Power (e.i.r.p.)
      2. 4.2.2 Permitted Range of Operating Frequencies
      3. 4.2.3 Unwanted Emissions in the Spurious Domain
      4. 4.2.4 Duty Cycle
      5. 4.2.5 Additional Requirements for FHSS Equipment
    3. 4.3 Receiver Requirements
      1. 4.3.1 Receiver Categories
      2. 4.3.2 Receiver Performance Criteria
      3. 4.3.3 Adjacent Channel Selectivity
      4. 4.3.4 Blocking or Desensitization
      5. 4.3.5 Spurious Radiations - Receiver
    4. 4.4 Spectrum Access Techniques
      1. 4.4.1 Listen Before Talk
        1. 4.4.1.1 LBT Timing Paramters
        2. 4.4.1.2 Receiver LBT Threshold and Transmitter Max On-Time
      2. 4.4.2 Detect And Avoid Technique (DAA)
  7. 5 ETSI EN 300 328
    1. 5.1 Technical Requirements
      1. 5.1.1 Environmental Profile
    2. 5.2 Equipment Types
      1. 5.2.1 Wideband Data Transmission Equipment Types
      2. 5.2.2 Adaptive and Non-Adaptive Equipment
      3. 5.2.3 Receiver Categories
      4. 5.2.4 Antenna Types
    3. 5.3 Conformance Requirements
      1. 5.3.1 Conformance Requirements for Frequency Hopping Equipment
        1. 5.3.1.1  RF Output Power
        2. 5.3.1.2  Duty Cycle
        3. 5.3.1.3  Accumulated Transit Time, Frequency Occupation and Hopping Sequence
        4. 5.3.1.4  Hopping Frequency Separation
        5. 5.3.1.5  Medium Utilization (MU) Factor
        6. 5.3.1.6  Adaptivity (Adaptive FHSS)
          1. 5.3.1.6.1 Adaptive FHSS Using LBT
          2. 5.3.1.6.2 Adaptive FHSS Using DAA
          3. 5.3.1.6.3 Adaptive FHSSS - Short Control Signaling Transmissions
        7. 5.3.1.7  Occupied Channel Bandwidth
        8. 5.3.1.8  Transmitter Unwanted Emissions in the Out-of-Band Domain
        9. 5.3.1.9  Transmitter Unwanted Emissions in the Spurious Domain
        10. 5.3.1.10 Receiver Spurious Emissions
        11. 5.3.1.11 Receiver Blocking
        12. 5.3.1.12 Geo-Location Capability
      2. 5.3.2 Conformance Requirements for Wideband Data Transmission Equipment (Non-FHSS)
        1. 5.3.2.1  RF Output Power
        2. 5.3.2.2  Power Spectral Density
        3. 5.3.2.3  Duty Cycle, Tx-sequence and Tx-gap
        4. 5.3.2.4  Medium Utilization Factor
        5. 5.3.2.5  Adaptivity (Non-FHSS)
          1. 5.3.2.5.1 Adaptive Non-FHSS using LBT
            1. 5.3.2.5.1.1 Frame Based Equipment
            2. 5.3.2.5.1.2 Load Based Equipment
          2. 5.3.2.5.2 Adaptive Non-FHSS Using DAA
          3. 5.3.2.5.3 Adaptive Non-FHSS - Short Control Signaling Transmissions
        6. 5.3.2.6  Occupied Channel Bandwidth
        7. 5.3.2.7  Transmitter Unwanted Emissions in the Out-of-Band Domain
        8. 5.3.2.8  74
        9. 5.3.2.9  Transmitter Unwanted Emissions in the Spurious Domain
        10. 5.3.2.10 Receiver Spurious Emissions
        11. 5.3.2.11 Receiving Blocking
        12. 5.3.2.12 Geo-Location Capability
  8. 6 ETSI EN 301 893
    1. 6.1 Technical Requirements
      1. 6.1.1 Environmental Profile
    2. 6.2 Conformance Requirements
      1. 6.2.1  Nominal Center Frequencies
      2. 6.2.2  Nominal Channel Bandwidth and Occupied Channel Bandwidth
      3. 6.2.3  RF Output Power, Transmit Power Control (TPC) and Power Density
      4. 6.2.4  Transmitter Unwanted Emissions - Outside the 5 GHz RLAN Bands
      5. 6.2.5  Transmitter Unwanted Emissions - Within 5 GHz RLAN Bands
      6. 6.2.6  Receiver Spurious Emissions
      7. 6.2.7  Dynamic Frequency Selection (DFS)
      8. 6.2.8  Adaptivity (Channel Access Mechanism)
        1. 6.2.8.1 Frame Based Equipment (FBE)
          1. 6.2.8.1.1 Initiating Device Channel Access Mechanism
          2. 6.2.8.1.2 Responding Device Channel Access Mechanism
        2. 6.2.8.2 Load Based Equipment (LBE)
          1. 6.2.8.2.1 Device Types - Load Based Equipment
          2. 6.2.8.2.2 Multi-Channel Operation - Load Based Equipment
          3. 6.2.8.2.3 Priority Classes - Load Based Equipment
          4. 6.2.8.2.4 ED Threshold Level - Load Based Equipment
          5. 6.2.8.2.5 Initiating Device Channel Access Mechanism - Load Based Equipment
          6. 6.2.8.2.6 Responding Device Channel Access Mechanism - Load Based Equipment
        3. 6.2.8.3 Short Control Signalling Transmissions (FBE and LBE)
      9. 6.2.9  Receiver Blocking
      10. 6.2.10 User Access Restrictions
      11. 6.2.11 Geo-Location Capability
  9. 7 ETSI EN 301 489
    1. 7.1 Technical Requirements
    2. 7.2 Environment Classification
    3. 7.3 Test Conditions
    4. 7.4 RF Exclusion Bands
    5. 7.5 Performance Assessment
      1. 7.5.1 Equipment Classification
    6. 7.6 Performance Criteria
      1. 7.6.1 Minimum Performance Level
    7. 7.7 Emission Requirements
      1. 7.7.1 Radiated Emissions - Enclosure Port
      2. 7.7.2 Conducted Emissions - DC Power Input/Output Ports
      3. 7.7.3 Conducted Emissions - AC Mains Power Input/Output Ports
      4. 7.7.4 Harmonic Current Emissions - AC Mains Power Input Port
      5. 7.7.5 Voltage Fluctuations and Flicker - AC Mains Power Input Port
      6. 7.7.6 Conducted Emissions - Wired Network Ports
    8. 7.8 Immunity Requirements
      1. 7.8.1 RF Electromagnetic Field (80 MHz to 6000 MHz) - Enclosure Port
      2. 7.8.2 Electrostatic Discharge - Enclosure
      3. 7.8.3 Fast Transients - Common Mode
      4. 7.8.4 RF - Common Mode
      5. 7.8.5 Transients and Surges in the Vehicular Environment
      6. 7.8.6 Voltage Dips and Interruptions
      7. 7.8.7 Surges
  10. 8 IEC 62368-1
    1. 8.1 Safety Requirements
  11. 9 EN 62311
    1. 9.1 Requirements and Limits of EN 62311
  12. 10References
  13. 11Revision History

6.2.7 Dynamic Frequency Selection (DFS)

An RLAN should 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).

Within the context of the operation of the DFS function, an RLAN device should operate as either a master or a slave. RLAN devices operating as a slave should 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 should 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 ad-hoc manner on channels whose nominal bandwidth falls partly or completely within the frequency ranges 5250 MHz to 5350 MHz or 5470 MHz to 5725 MHz should employ DFS and should 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 should behave as slave with radar detection independent of their output power.

Refer to ETSI EN 301 893 for a detailed operational behavior and individual requirements for both master and slave devices.

The DFS requirements and their applicability are shown in Table 6-10.

In case of equipment with antenna connectors, these limits apply to emissions at the antenna port (conducted). For emissions radiated by the cabinet or emissions radiated by integral antenna equipment (without antenna connectors), these limits are e.r.p. for emissions up to 1 GHz and e.i.r.p. for emissions above 1 GHz.

Table 6-10 DFS Requirements and their Applicability
RequirementDFS Operational mode
MasterSlave without radar detection (see Table 52, (2))Slave with radar detection (see Table 52, (2))
Radar Interference detection FunctionRequired (3)Not requiredRequired
Channel Availability CheckRequiredNot requiredRequired (2)
Off-Channel CAC (see (1))RequiredNot requiredRequired (2)
In-Service MonitoringRequiredNot requiredRequired
Channel ShutdownRequiredRequiredRequired
Non-Occupancy PeriodRequiredNot requiredRequired
Uniform SpreadingRequired (4)Not requiredNot required
(1) Where implemented by the manufacturer.
(2) A slave with radar detection is not required to perform a CAC or Off-Channel CAC at initial use of the channel but only after the slave has detected a radar signal on the Operating Channel by In-Service Monitoring and the Non-Occupancy Period resulting from this detection has elapsed.
(3) Radar detection should be used when operating on channels whose nominal bandwidth falls partly or completely within the frequency ranges 5250 MHz to 5350 MHz or 5470 MHz to 5725 MHz.
(4) Uniform Spreading is required across the frequency ranges 5150 MHz to 5350 MHz and 5470 MHz to 5725 MHz. Uniform Spreading is not applicable for equipment that only operates in the band 5150 MHz to 5250 MHz.

The limits for the DFS requirements are shown in Table 6-11.

Table 6-11 Limits on DFS Requirements
ParameterLimits
Channel Availability Check Time> 60 Seconds (1)
Minimum Off-Channel CAC Time> 6 Minutes (2)
Maximum Off-Channel CAC Time< 4 Hours (2)
Channel Move Time< 10 Seconds
Channel Closing Transmission Time< 1 Second
Non-Occupancy Period> 30 Minutes
(1) For channels whose nominal bandwidth falls completely or partly within the band 5600 MHz to 5650 MHz, the Channel Availability Check Time should be 10 minutes.
(2) For channels whose nominal bandwidth falls completely or partly within the band 5600 MHz to 5650 MHz, the Off-Channel CAC Time should be within the range 1 hour to 24 hours.

The limits for the Radar Detection Threshold levels are shown in Table 6-12.

Table 6-12 Limits on Radar Detection Threshold Levels
e.i.r.p. Spectral Density (dBm/MHz)Limits (1)(2)
10-62 dBm
(1) This is the level at the input of the receiver of an RLAN device with a maximum e.i.r.p. density of 10 dBm/MHz and assuming a 0 dBi receive antenna. For devices employing different e.i.r.p. spectral density and/or a different receive antenna gain G (dBi) the Radar Detection Threshold Level at the receiver input follows the following relationship:

DFS Detection Threshold (dBm) = -62 + 10 - e.i.r.p. Spectral Density (dBm/MHz) + G (dBi);

however the Radar Detection Threshold Level should not be less than -64 dBm assuming a 0 dBi receive antenna gain.
(2) Slave devices with a maximum e.i.r.p. of less than 23 dBm do not have to implement radar detection unless these devices are used in fixed outdoor point to point or fixed outdoor point to multipoint applications.

The parameters of the reference DFS test signal are shown in Table 6-13.

Table 6-13 Parameters of the Reference DFS Test Signal
Pulse width W (μs)Pulse repetition frequency PRF (PPS)Pulses per burst (PPB)
170018

The parameters for Radar test signals are shown in Table 6-14.

Table 6-14 Parameters of Radar Test Signals
Radar test signal # (see (1) to (3))Pulse width W (μs)Pulse repetition frequency PRF (PPS)Number of different PRFsPulses per burst for each PRF (PPB) (5)
MinMaxMinMax
10.552001000110 (6)
20.5152001600115 (6)
30.51523004000125
4253020004000120
50.523004002 / 310 (6)
60.5240012002 / 315 (6)
(1) Radar test signals #5 and #6 are single pulse based Staggered PRF radar test signals using 2 or 3 different PRF values. For radar test signal #5, the difference between the PRF values chosen should be between 20 PPS and 50 PPS. For radar test signal #6, the difference between the PRF values chosen should be between 80 PPS and 400 PPS.
(2) The total number of pulses in a burst is equal to the number of pulses for a single PRF multiplied by the number of different PRFs used.
(3) For the CAC and Off-Channel CAC requirements, the minimum number of pulses (for each PRF) for any of the radar test signals to be detected in the band 5600 MHz to 5650 MHz should be 18.

The Detection Probability levels are shown in Table 6-15.

Table 6-15 Detection Probability Levels
ParameterDetection Probability (Pd)(1)
Channels whose nominal bandwidth falls partly or completely within the 5600 MHz to 5650 MHz bandOther channels
CAC, Off-Channel CAC99.99%60%
In-Service Monitoring60%60%
(1) Pd gives the probability of detection per simulated radar burst and represents a minimum level of detection performance under defined conditions. Therefore Pd does not represent the overall detection probability for any particular radar under real life conditions.