Power Save Aware RU Allocation via OFDMA Trigger
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Solution Overview
Problem
Legacy power save methodologies in wireless communication networks are inefficient, leading to high latency, increased contention, and reduced battery life due to single-user transmissions and collisions among multiple stations trying to retrieve buffered data.
Innovation Solution
Implementing power save aware resource unit allocation using OFDMA triggers and MU-MIMO techniques, allowing for preemptive OFDMA transmissions before single-user PS-POLL responses, thereby optimizing channel capacity and reducing contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy power save methodologies are used with single-user transmissions, then stations can retrieve buffered data, but latency increases and contention occurs among multiple stations
Solution Approach 1:
The patent combines multiple single-user PS-POLL transmissions into a single OFDMA transmission where multiple stations simultaneously transmit PS-POLL frames to the access point using different resource units. This merging eliminates the sequential nature of legacy power save mode, reducing latency and contention while maintaining power save functionality for legacy stations.
Solution Approach 2:
The access point sends an OFDMA trigger frame in advance that pre-allocates resource units to multiple stations before they transmit their PS-POLL frames. This preliminary action coordinates the transmissions to occur simultaneously rather than sequentially, reducing contention and latency while ensuring stations wake up at the same predetermined time to receive the trigger frame.
2Productivity
If multiple stations transmit PS-POLL responses simultaneously in legacy mode, then channel access is possible, but collisions occur and efficiency decreases
Solution Approach 1:
The patent segments the available channel bandwidth into multiple orthogonal resource units, each assigned to a specific station. This segmentation allows multiple stations to transmit simultaneously on different resource units without causing collisions, as the resource units are orthogonal and do not interfere with each other. The trigger frame indicates which resource units are allocated to which stations, ensuring organized and collision-free access.
3Productivity
If OFDMA trigger frames are sent before PS-POLL responses, then channel capacity is optimized, but legacy power save protocols must be modified
Solution Approach 1:
The patent introduces a universal OFDMA trigger frame format that can serve multiple functions: it triggers PS-POLL transmissions from legacy power save stations, allocates resource units for uplink data transmissions, and coordinates multi-user MIMO operations. This multi-functional trigger frame reduces the need for separate signaling mechanisms and integrates legacy power save mode with modern OFDMA capabilities, managing complexity through consolidation rather than proliferation of separate protocols.
Data Source
AI summary
Systems and methods for power save aware resource unit allocation include sending, by an access point to a station, a beacon indicating that the station has data buffered at the access point, wherein the station is in a power-save mode, sending, by the access point after sending the beacon, an Orthogonal Frequency Division Multiple Access (OFDMA) trigger to the station, wherein the OFDMA trigger causes the station in the power-save mode to send PS-POLL using OFDMA, receiving, by the access point and from the station, a PS-POLL frame using OFDMA.