MU Wireless Transmission Without PS-Poll Scheduling Delays
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Solution Overview
Problem
Existing MU transmission protocols face inefficiencies in simultaneous Downlink (DL) and Uplink (UL) transmissions to/from multiple STAs due to power state indication delays and inflexible scheduling, particularly in Power Save Mode (PSM), leading to reduced throughput and latency.
Innovation Solution
Implementing a Power Save (PS) poll-less (PS-Poll-less) PSM mechanism that allows MU DL and UL transmissions without requiring power state indications, enabling efficient scheduling of non-AP STAs in various power states, including those in PSM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If power state indications (PS Poll frames) are required for MU transmissions, then power consumption is managed, but transmission delay and latency increase
Solution Approach 1:
The patent extracts the PS Poll frame exchange mechanism from the MU transmission protocol, allowing MU transmissions to proceed without requiring power state indication frames. This removes the unnecessary communication overhead while maintaining power management functionality through alternative mechanisms.
Solution Approach 2:
The patent implements preliminary power state management by having STAs indicate their power save status in advance during association or capability exchange phases. This allows the AP to schedule MU transmissions appropriately without requiring real-time PS Poll frames, thus reducing transmission delay while maintaining power awareness.
2Reliability
If traditional scheduling protocols are used for MU transmissions, then power state management is maintained, but throughput and channel utilization decrease
Solution Approach 1:
The patent implements dynamic scheduling that adapts to STA power states without requiring rigid PS Poll frame exchanges. The AP can dynamically adjust MU transmission schedules based on pre-indicated power save statuses, enabling flexible channel access that improves throughput while maintaining reliable power state management.
Solution Approach 2:
The patent makes the power state indication mechanism universal by integrating it into existing capability exchange and association procedures. This multi-functional approach allows power state management to work seamlessly with MU transmissions without requiring separate dedicated frame exchanges, thereby improving overall system throughput.
3Adaptability or versatility
If PS Poll frames are exchanged before MU transmissions, then power save mode operation is supported, but channel access overhead increases
Solution Approach 1:
The patent merges the power state indication functionality into existing control frames and capability exchange mechanisms. By combining multiple functions into unified frame structures, the patent eliminates separate PS Poll frame exchanges while maintaining power save mode support, thus reducing channel access overhead and simplifying the protocol.
4Productivity
If simultaneous MU DL and UL transmissions are enabled, then channel utilization improves, but interference and scheduling complexity increase
Solution Approach 1:
The patent segments the channel access mechanism into independent uplink and downlink components, allowing simultaneous MU DL and UL transmissions to proceed independently. By dividing the scheduling into separate uplink and downlink resource allocations, the patent reduces interference management complexity while maintaining high channel utilization.
Data Source
AI summary
For example, an Access Point (AP) wireless communication station (STA) may be configured to identify a plurality of non-AP STAs in a Power Save (PS) poll-less (PS-Poll-less) Power Save Mode (PSM) to be addressed by a PS-Poll-less Multi-User (MU) Downlink (DL) transmission, which does not require prior receipt of PS Poll frames from the plurality of non-AP STAs in the PS-Poll-less PSM; to transmit a beacon frame including a traffic indication to indicate that traffic is pending for transmission from the AP STA to the plurality of non-AP STAs in the PS-Poll-less PSM; and, subsequent to the beacon frame, transmit the PS-Poll-less MU DL transmission to the plurality of non-AP STAs in the PS-Poll-less PSM.