Summary of workshop on NR unlicensed July 2010 doc.: IEEE 802.11-10/0xxxr0 Summary of workshop on NR unlicensed 20 October 2017 Authors: Name Company Phone email Andrew Myles Cisco +61 418 656587 amyles@cisco.com Andrew Myles, Cisco Andrew Myles, Cisco

Now is the time for IEEE 802.11 Coexistence SC to influence coexistence with NR-Unlicensed NR-Unlicensed design and issues are being discussed in 3GPP and informal workshops Discussions indicated the ultimate NR design will have a significant impact on coexistence with Wi-Fi The Wi-Fi community members need to bring NR related coexistence issues to our attention for action Andrew Myles, Cisco

NR-Unlicensed design and issues are being discussed in 3GPP and informal workshops An informal 5G Workshop on NR-Unlicensed and Shared Spectrum was held on 3-4 Oct 2017 in San Diego The 5G Workshop materials are available here The intro deck indicated the materials are not confidential 26 companies attended the 5G Workshop Do not have complete list of attendees But they included Ericsson, Huawei, Intel, Nokia, Qualcomm, Samsung, AT&T, LGE, Vivo, ... Andrew Myles, Cisco

Discussions indicated the ultimate NR design will have a significant impact on coexistence with Wi-Fi Some points derived from presentations at NR Workshop It is proposed that NR use 60GHz Comment: should we be concerned about 802.11ad/ay sharing with NR? It is proposed that NR use 2.4GHz operation Comment: should we be concerned about 802.11b/g/n/ax sharing with NR? It is proposed that NR use 900MHz operation Comment: should we be concerned about 802.11ah sharing with NR? It is proposed that 3GPP engage in more regulatory activities, including Influencing regulators to impose a common time reference for synchronisation between operators, particularly in green field spectrum Influencing rules on channel reservation and sharing for high order MIMO systems and mmW bands Comment: highlights the need for IEEE 802.11 WG to remain engaged with regulators on coexistence issues Andrew Myles, Cisco

Discussions indicated the ultimate NR design will have a significant impact on coexistence with Wi-Fi Some points derived from presentations at NR Workshop There is significant focus on cooperation among operators to optimise access Comment: cooperation does provide opportunities for optimisations but is also contrary to mantra that in unlicensed spectrum anyone, anytime, anyplace should be able to set up a network that just works well enough rather than focusing on optimisation Comment: of course, we should not object to cooperation within a MCOT There is a proposal for universal signalling for channel reservation across RATs, ie common preamble Comment: this is something that IEEE 802 has been advocating for some time but it will require discussions with 3GPP soon while we are designing 802.11ax But others are still advocating that ED be the primary sharing mechanism Comment: we might want to support mechanisms beyond ED Andrew Myles, Cisco

Discussions indicated the ultimate NR design will have a significant impact on coexistence with Wi-Fi Some points derived from presentations at NR Workshop There is interest in directional LBT to increase spatial reuse Comment: this might be of interest to 802.11ax or beyond There are some efforts underway to eliminate reservation signals (energy blocking) and stop transmission quicker when no more data to send Comment: more starting and ending positions is something that IEEE 802 has been advocating to 3GPP in context of LAA Comment: it is good that the problem is recognised, but why shouldn’t the same principle apply to LAA? A fairness criteria has been proposed; NR-U should not impact Wi-Fi/LAA more than an additional Wi-Fi/LAA network in terms of user-perceived throughput/latency/coverage/BO Comment: good  Andrew Myles, Cisco

Discussions indicated the ultimate NR design will have a significant impact on coexistence with Wi-Fi Some points derived from presentations at NR Workshop There are proposals to ensure HARQ feedback occurs in same MCOT Comment: this will make NR more like 802.11 than LAA in the way the LBT feedback mechanism operates One stakeholder continues to believe that Wi-Fi community is reneging on an agreement in ETSI BRAN that 802.11ax use ED = -72dBm only Comment: there was no such agreement (IEEE 802 was not a participant); the actual agreement (between a small number of Wi-Fi and LAA stakeholders) was to reconsider the issue when EN 301 893 was revised Andrew Myles, Cisco

The Wi-Fi community members need to bring NR related coexistence issues to our attention for action It is assumed IEEE 802.11 WG’s ultimate goal is for fair access for all systems (including Wi-Fi) to unlicensed spectrum so that they can all compete on a level playing field Therefore it is probably worthwhile for the Wi-Fi community to monitor, and intervene as necessary, in NR-Unlicensed design and coexistence discussions in 3GPP and elsewhere … … because Wi-Fi is almost certainly going to have to coexist with NR-Unlicensed and decisions are being made now that will impact coexistence in the future The question is how? The answer is that we are going to have to rely on our members to bring issues of interest to the Coexistence SC Just like the material on the previous pages Andrew Myles, Cisco