"Medium Access Protocol" statement requirement for CE mark certification (WL1837)

Hi David,

I will check this and get back to you.

Regards,
Gigi Joseph.

Thank you Gigi! 

Hi David,

We support WiFi WMM Certification for medium access.

Regards,
Gigi Joseph.

Gigi,

Thanks a lot for your kind help and information!

As regarding to the "Medium Access Protocol", I am not sure if WMM is the required information.

According to the EN 300 328 V1.7.1 (http://www.etsi.org/deliver/etsi_en/300300_300399/300328/01.07.01_60/en_300328v010701p.pdf), in the clause 4.3.5,  "A medium access protocol is a mechanism designed to facilitate spectrum sharing with other devices in a wireless network."

According to test house engineer, as a manufacturer of the radio product, we need to provide a statement to EU explain how the device is operating to avoid the noise and interference to other devices. I got some sample statements from our test house for other products as following:

Sample 1:

The EUT complies with the requirement given that 802.11 standard uses Distributed Coordination Function (DCF). DCF is a form of carrier sense multiple access with collision avoidance (CSMA/CA). CSMA is a contention-based protocol making certain that all stations first sense the medium before transmitting. The main goal is to avoid having stations transmit at the same time, which results in collisions and corresponding retransmissions.

 BLE is a low energy version of Bluetooth specified in the version 4.0. Two of the lowest layers of BLE stack are Physical (PHY) and the Link Layer (LL). PHY takes care of transmitting and receiving bits. The Link Layer provides medium access, connection establishment, error control, and flow control. Link Layer connections use a stop-and-wait flow control mechanism based on cumulative acknowledgments, which at the same time provides error recovery capabilities. Each data channel packet header contains two one-bit fields called the Sequence Number (SN) and the Next Expected Sequence Number (NESN). The SN bit identifies the packet, whereas the NESN indicates which packet from the peer device should be received next. If a device successfully receives a data channel packet, the NESN of its next packet will be incremented, and that packet will serve as an acknowledgement. Otherwise, if a device receives a packet with an invalid CRC check, the NESN of the received packet cannot be relied upon. This forces the receiving device to resend its last transmitted packet, which serves as a negative acknowledgement.

Sample 2:

A frequency hopping spread spectrum (FHSS) system works by hopping from one frequency channel to another in a known sequence out of a select group of channels.  The XXX system frequency hops between 20 channels.  The group of 20 channels is selected out of a total of 38 hopping channels in the ISM band.  If it is determined that one of the 20 hopping channels is found to be noisy or poor due to other RF interference, then a new channel is selected from the 18 unused channels (i.e. 38 - 20 = 18) and the one noisy channel is released to the unused group.  This repeats whenever a noisy or poor channel is detected.

As you can see, we need such kind of protocol description for TI WL1837 radio in following area:

1. 802.11A/B/G/N;

2. Regular BT Mode;

3. BT LE mode; 

Since we do not know the details of these protocols implementation in WL1837, your kind help and further information on this certification requirement is greatly appreciated!

David

Hi David,

We are EN 300 328 V1.8.1 compliant.

The TI declaration of conformity link is below:
http://processors.wiki.ti.com/images/3/35/WL1835M0DCOM8B_DoC_140212.pdf

I couldn't find clause 4.3.5 in the relevant ETSI directive (http://www.etsi.org/deliver/etsi_en/300300_300399/300328/01.08.01_60/en_300328v010801p.pdf)

Regards,
Gigi Joseph.

Thank a lot Gigi!

Just one more question, does this declaration apply to WL1837 chipset as well?

David

Hi David,

No, 1837 isn’t part of the 1835 certification since there is another portion of 5 Ghz that doesn’t exist in 1835.
The module isn’t on the market yet and it will be certified separately , planned by EOY.

Regards,
Gigi Joseph.

Thanks a lot Gigi!

Hello Gigi

Does this also applicable for WILINK6 module, meaning does the Wilink6 also  EN 300 328 V1.8.1 compliant ?

Thanks, Yaron