Random Access Trigger Frame Scheduling for WLAN Uplink OFDMA

The patent segments the random access mechanism by dividing resource units into different types (first type for buffer status reports, second type for data transmission) and organizing clients into different groups based on their access needs. This segmentation reduces contention by directing different types of traffic to different resource units, thereby maintaining system performance while preserving client access flexibility.

The patent implements preliminary action by having clients send buffer status reports before actual data transmission. The access point schedules buffer status report transmissions in advance using first type resource units, allowing it to plan and optimize subsequent data transmission resource allocation. This preliminary scheduling action prevents random contention and improves overall system performance.

The patent applies dynamics by making the trigger frame scheduling adaptive rather than fixed periodic. The access point dynamically adjusts the scheduling of buffer status report trigger frames based on actual network conditions, including the number of active clients, their buffer status, and channel conditions. This dynamic approach maintains relatively simple scheduling logic while significantly improving resource usage efficiency by avoiding excessive polling.

The patent changes key scheduling parameters adaptively, including the timing and frequency of buffer status report trigger frames, the allocation of resource units for different client groups, and the thresholds for initiating random access procedures. These parameter changes allow the system to maintain simple scheduling logic while optimizing resource usage based on actual network conditions.

The patent uses preliminary buffer status report transmissions to inform the access point about client data needs before allocating resource units for actual data transmission. This preliminary information gathering allows the access point to allocate resource units efficiently, ensuring that resources are only allocated when actually needed, thereby improving client access capability while minimizing resource wastage.

Clients self-report their buffer status and transmission needs through buffer status reports, eliminating the need for the access point to continuously poll all clients. This self-service mechanism allows the system to allocate resource units more efficiently, improving client access capability while reducing unnecessary resource allocation and wastage.