1. doc.: IEEE 802.11-13/0178r1 Submission January 2013 Jiamin Chen, HuaweiSlide 1 A Simplified Method for Beamforming Training Procedure for Multi-Band Capable MM-Wave Device Date: 2013-01-23 Author(s)/contributors: (This will grow to reflect those providing explicit contributions / review comments of this document. Please let author know if any name is conspicuously missing from this list.)

2. doc.: IEEE 802.11-13/0178r1 Submission January 2013 Introduction A device is multi-band capable if the value of its local MIB variable dot11MultibandImplemented is true. The multi-band capable MM-Wave device can operate on both 60GHz and 2.4GHz or/and 5GHz frequency band. Beamforming(BF) is a mechanism that is used by a pair of STAs to achieve the necessary DMG link budget for subsequent communication. Multi-band capable MM-Wave device can send feedback information such as Initiator Sector Sweep (ISS) Sector ID via 2.4GHz or 5GHz frequency band MAC and PHY layer to speed up the BF training procedure to setup DMG link. Jiamin Chen, HuaweiSlide 2

3. doc.: IEEE 802.11-13/0178r1 Submission January 2013 Beamforming Training Procedure for 802.11ad BF training is a bidirectional sequence of BF training frame transmissions that uses sector sweep and provides the necessary signaling to allow each STA to determine appropriate antenna system settings for both transmission and reception. Jiamin Chen, HuaweiSlide 3

4. doc.: IEEE 802.11-13/0178r1 Submission January 2013 Beamforming training procedure for 802.11ad An example of 802.11ad BF training procedure: Step1: Initiator Sector Sweep Phase The initiator (STA1) transmits Initiator Sector Sweep (ISS) frame with corresponding Sector ID to all sectors. Meanwhile, The responder (STA2) receives the ISS frame sent by STA1. Step2: Responder Sector Sweep Phase The STA2 transmits Responder Sector Sweep (RSS) frame with corresponding sector ID to all sectors. Once the STA1 receives the RSS frame sent by STA2, both two STAs will know the location of each other and the appropriate antenna system settings for both transmission and reception. Step 2: Jiamin Chen, HuaweiSlide 4 STA 1 STA 2 Sweep Sector Step 1: Initiator Sector Sweep phase Step 2: Responder Sector Sweep phase STA 1 STA 2

5. doc.: IEEE 802.11-13/0178r1 Submission January 2013 A Simplified method for Beamforming Training Procedure for Multi-Band Capable MM-Wave Device For multi-band MM-Wave Device, once receiving the ISS frame sent by STA1 in Step 1, the STA2 can immediately sends feedback information with Initiator Sector Sweep (ISS) Sector ID to STA1 via 2.4GHz or 5GHz frequency band MAC and PHY layer. So, the Step 2 Responder Sector Sweep phase can be omitted. Call for comments and suggestion for further study. Jiamin Chen, HuaweiSlide 5 Step 1 STA 1 STA 2 Feedback information