MU Multi-TID Transmission Injection for Latency Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly IEEE 802.11bx networks, face challenges in reducing transmission delays for latency-sensitive payloads due to channel access delay and duration issues, where urgent payloads are delayed until the next available transmission opportunity, even if they arrive during ongoing transmissions not destined for the target station.
Innovation Solution
Implementing multi-user multi-traffic-identifier (MU Multi-TID) transmission methods that allow urgent payloads to be injected into an ongoing multi-user physical protocol data unit (MU PPDU), with mechanisms like buddy station IDs or extra user fields in the preamble to indicate resource unit (RU) allocation, enabling targeted stations to receive latency-sensitive data on overloaded RUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If urgent payloads are transmitted using traditional channel access methods, then transmission reliability is maintained, but transmission latency increases due to waiting for next available opportunity
Solution Approach 1:
The patent applies preliminary action by pre-configuring buddy station relationships and pre-allocating resource units before urgent transmission needs arise. When urgent payloads need transmission, the system can immediately inject them into ongoing MU PPDU transmissions using pre-established buddy station agreements, eliminating the need to wait for next channel access opportunities while maintaining transmission reliability through pre-planned resource allocation
Solution Approach 2:
The patent uses buddy stations as intermediaries to enable urgent payload transmission. The buddy station receives and forwards urgent payloads that are injected into ongoing MU PPDU transmissions, acting as a mediator that allows latency-sensitive data to bypass traditional channel access delays while maintaining reliable delivery through the intermediary station
2Productivity
If single user transmissions are used, then transmission simplicity is maintained, but network efficiency decreases due to inability to transmit to multiple recipients simultaneously
Solution Approach 1:
The patent merges multiple transmission functions into a single MU PPDU structure by allowing multiple stations including buddy stations to receive data simultaneously on the same resource unit. This combining of multiple recipients into one transmission opportunity significantly improves network efficiency by eliminating the need for separate sequential transmissions to each station
Solution Approach 2:
The patent extends the universality of resource units by allowing them to serve multiple functions: primary recipients receive their allocated data, while buddy stations simultaneously receive urgent payloads injected into the same MU PPDU. This multi-functionality of RUs enables the system to handle both regular and urgent traffic efficiently without requiring separate dedicated resources
3Adaptability or versatility
If resource units are allocated exclusively to specific stations, then transmission reliability for scheduled stations is ensured, but flexibility decreases when urgent payloads need to be transmitted to other stations
Solution Approach 1:
The patent applies dynamics by making resource unit allocation flexible through the buddy station mechanism. While primary allocations remain stable for scheduled transmissions, the system dynamically allows urgent payloads to be injected into ongoing transmissions by redirecting them to buddy stations. This dynamic adaptation enables the system to respond to urgent transmission needs without disrupting established allocation patterns
Data Source
AI summary
Multiuser (MU) Multi-TID (multi-traffic-identifier) transmission may be enabled in a resource unit (RU). To transmit an urgent payload as soon as possible, the urgent payload may be injected/included into the ongoing MU physical protocol data unit (MU PPDU), if possible. This may be accomplished by indicating to the latency-sensitive wireless station (STA) the ID of a companion (or buddy) station that has an assigned resource unit (RU) on which the STA may expect to receive the urgent payload, also referred to as the “overloaded RU.” Alternatively, an extra user field in the preamble of the MU PPDU may be used to indicate to the STA its station ID as well as the location of the overloaded RU. A receiver operating on an A-MPDU may select the RU it receives, and may identify (or determine) a wrong transmission based on the transmitter address.