RTS Frame Bandwidth Allocation for WLAN Collision Prevention
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Solution Overview
Problem
In IEEE 802.11 based wireless local area networks, especially in dense environments with multiple access points and stations, there is a need for an improved protection mechanism to prevent collisions during simultaneous transmissions, as existing technologies lack effective methods to manage bandwidth allocation and transmission opportunities efficiently.
Innovation Solution
A method and device for transmitting a physical layer protocol data unit (PPDU) that involves transmitting a request to send (RTS) frame with bandwidth fields, receiving clear to send (CTS) frames, determining the transmission bandwidth by comparing the indicated bandwidths, and transmitting the PPDU within the determined bandwidth, ensuring efficient bandwidth utilization and collision prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple stations transmit simultaneously in dense WLAN environments, then network throughput may increase, but collision probability increases and transmission reliability deteriorates
Solution Approach 1:
The transmitting station sends RTS frames to multiple receiving stations before actual data transmission to reserve bandwidth and coordinate transmission timing. This preliminary reservation prevents simultaneous transmissions and collisions, ensuring reliable communication while maintaining high throughput in dense WLAN environments.
Solution Approach 2:
Receiving stations respond with CTS frames to confirm bandwidth reservation and transmission permissions. This feedback mechanism allows the transmitting station to verify successful reservation and adjust transmission parameters, thereby maintaining both high throughput and transmission reliability through coordinated multi-user access.
2Productivity
If bandwidth is allocated to multiple receiving stations, then spectrum efficiency improves, but bandwidth management complexity increases
Solution Approach 1:
The total available bandwidth is segmented and allocated to different receiving stations through separate allocation fields in the RTS frame. Each receiving station receives a specific bandwidth portion, enabling efficient spectrum utilization while simplifying management through structured, field-based allocation rather than complex centralized control.
3Productivity
If transmission bandwidth is dynamically adjusted based on CTS responses, then throughput optimization improves, but determination complexity increases
Solution Approach 1:
The transmitting station automatically determines the transmission bandwidth by comparing the first bandwidth (from RTS) with the second bandwidth (total bandwidth from CTS responses) using simple comparison logic. This self-service determination mechanism optimizes throughput through dynamic bandwidth adjustment while avoiding complex external control systems.
Data Source
AI summary
A method for transmitting a physical layer protocol data unit (PPDU) in a transmission opportunity (TXOP) and a device using the same are provided. The device transmits a request to send (RTS) frame to a plurality of receiving stations. The RTS frame includes a bandwidth field and a plurality of allocation fields. The bandwidth field indicates a first bandwidth in which the RTS frame is transmitted. Each allocation field indicates a bandwidth in which a clear to send (CTS) frame is to be sent by a corresponding receiving station. The device determines a transmission bandwidth of a PPDU to be sent by comparing the first bandwidth with a second bandwidth which is a total bandwidth indicated by the plurality of allocation fields.