## 1 Introduction  
The IEEE task group '_ay_' defined technical advances for harnessing MIMO (Multiple Input Multiple Output), channel bonding/aggregation, and beamforming techniques to deliver very high speed (100 GBit/s) and extremely low latency over WiFi [1]. The emerging concept of '_limitless connectivity_' mandates the availability of reliable WiFi connections that can handle extreme demands for both speed and coverage. This calls for innovation in WiFi architecture and new methods of data networking. With the ensuing presence of bandwidth-hungry mobile applications, extremely high throughput demands, and WiFi 6 (and 6E) saturation, the WiFi alliance is investigating the IEEE 802.11 be standard [2], known as WiFi 7 (a major move towards _limitless connectivity_). Final approval of WiFi 7 is expected in 2024, as it is now in the drafting phases, although products will likely be out sooner once the draft protocols are approved.  
Of particular relevance to this work is the niche 60 GHz WiFi, 802.11_ay_, which has specified new advances to physical (PHY) and medium access control (MAC) [1]. Built on IEEE 802.11_ay_, 802.11_ay_ brings numerous technical advances, including MIMO, channel bonding, aggregation, and beamforming to deliver 100 GBit/s of output and extremely low latency [3; 4]. IEEE 802.11_ay_ provides such a wide arsenal of technological advances. These enhanced performances open the door for emerging applications, such as distributed mmWave networks, virtual and augmented reality, real-time control/actuation, and 8K video streaming. The coverage area of IEEE 802.11_ay_ is relatively small due to the adoption of a new millimeter wave (_mmWave_). However, IEEE 802.11_ay_ has an inherent capability to meet real-time constraints even in a highly congested coverage area by adopting mmWave and MIMO-based beamforming.  
The new design of IEEE 802.11_ay_ focuses mainly on the PHY and MAC layer solutions. In particular, the three main design goals specified by the IEEE Task Group are to  
* Provide a minimum of 20 Gbit/s throughputs;
* Be backward compatible with IEEE 802.11 ad; and
* Broaden the collection of conceivable use cases and situations by offering innovative PHY and MAC layer solutions.  
The integration of sophisticated technologies at the two layers, prevalent in modern WiFi networks, enables the majority of the future application and service requirements. Channel bonding, MIMO, aggregation, multi-user transmission, fast beamforming training, etc. are examples of enhancements for higher impact. However, because of the smaller mmWave coverage area and limited capabilities of TCP congestion control models, the utilization of such advanced features is often limited to stationary networks with fixed devices. In mobile networks, handoffs are pretty common due to small coverage, which adversely impacts the TCP model's performance. Multipath TCP (MPTCP) [5] has been standardized by IETF and used by Apple; however, there is not much support as required from the transport (TRA) layer. The resulting delay for (re)connection due to loss recovery and handover management can be substantial, to the point where it essentially undermines the multipath performance gain from the aforementioned PHY/MAC layer advances.  
In particular, the stochastic design of MPTCP requires a major rethink to realize the anticipated changes. There are several fundamental assumptions that are challenged, including Poisson arrivals of packets, Gaussian process, and parameter certainty inherent in the stochastic TCP modeling at the TRA layer, which requires a drastically new approach to harness the IEEE 802.11_ay_ PHY/MAC layer advances.