Wireless Resource Unit Contention via RTS-CTS Signaling
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Solution Overview
Problem
Conventional wireless networks face inefficiencies in bandwidth utilization due to the limited availability of resource units (RUs) for random access, especially for unassociated stations, leading to suboptimal channel usage and reduced communication efficiency.
Innovation Solution
Implementing a wireless system that allows stations to execute a contention process for available resource units (RUs) through broadcast trigger communications, enabling stations to monitor and select RUs even if they do not initially win contention, by using request-to-send-like (RTS-like) and clear-to-send-like (CTS-like) physical layer signaling for efficient parallel transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional UORA contention process is used, then stations can access available RUs, but bandwidth efficiency is limited due to low probability of RU utilization (37%)
Solution Approach 1:
The patent applies preliminary action by implementing a two-stage contention process where stations first perform initial contention for RUs, and then those that fail can monitor for CTS-like signals and perform secondary contention. This preliminary setup of multiple contention opportunities increases the overall probability of RU utilization from 37% to 60%, directly resolving the contradiction between productivity and reliability.
2Adaptability or versatility
If more stations contend for limited RUs, then network access opportunity increases, but contention collision and channel access time increase
Solution Approach 1:
The patent segments the contention process into multiple stages: initial contention, monitoring phase for CTS-like signals, and secondary contention. This segmentation allows stations that fail initial contention to continue accessing RUs in subsequent stages without causing immediate collisions, thereby increasing network access opportunity while managing channel access time effectively through structured phases.
3Speed
If unassociated stations are given random access opportunities, then network joining speed improves, but RU availability for associated stations decreases
Solution Approach 1:
The patent implements dynamics by making RU allocation adaptive based on station association status and contention outcomes. Associated stations receive guaranteed RUs while unassociated stations compete for remaining RUs through the two-stage process. This dynamic allocation ensures that unassociated stations can join quickly while associated stations maintain sufficient RU availability, resolving the contradiction between speed and quantity.
Data Source
AI summary
A method can include wireless device operations, including receiving a trigger communication that identifies available random access resource units (RA RUs), the RA RUs being portions of transmission channel for a wireless system. In response to a back-off value and a number of available RA RUs, selecting or not selecting one RA RU as a transmission RA RU. In response to not selecting a transmission RA RU, monitoring for wireless responses following the trigger communication to determine unselected RA RUs, designating one unselected RA RUs as an alternate RA RU; and transmitting uplink data on the alternate RA RU. The unselected RA RUs comprise any RA RUs that remain after other wireless devices have selected RA RUs in response to the trigger communication. Corresponding devices and systems are also disclosed.