Wireless Data Channel Reservation via Lightweight Control Frames
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Solution Overview
Problem
Current wireless communication systems, such as IEEE 802.11, face inefficiencies in data channel reservation due to the large bandwidth requirements of RTS/CTS frames and the potential for data collisions, especially in high-speed environments, which lead to time consumption and overhead.
Innovation Solution
The introduction of new control frame structures, including a REQUEST frame and a NOTIFY frame, along with a defined Intermediate Inter-Frame Space (IIFS) to efficiently reserve data channels, allowing nodes to determine successful reservation or collision without the need for large RTS/CTS frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RTS/CTS frames are used for data channel reservation, then collision avoidance is improved, but control overhead and bandwidth consumption increase
Solution Approach 1:
The patent extracts only the essential function of RTS/CTS (collision avoidance through timing information) while removing the bulky frame structures. It uses simplified control frames containing only necessary timing fields (SIFS, DIFS, slot time) to achieve collision avoidance without the overhead of complete RTS/CTS frame exchanges.
Solution Approach 2:
The patent employs lightweight, minimalistic control frames that contain only essential timing information rather than complete RTS/CTS frame structures. These simplified frames act as disposable control signals that provide the necessary collision avoidance function with minimal bandwidth consumption and processing overhead.
2Reliability
If RTS/CTS frames are used for data channel reservation, then data channel reservation is achieved, but time consumption increases
Solution Approach 1:
The patent extracts only the critical timing reservation function from the RTS/CTS mechanism, using simplified control frames that contain minimal timing information (SIFS, DIFS, slot time). This extraction eliminates the time-consuming exchange of complete RTS/CTS frames while preserving the essential data channel reservation capability through timing-based conflict detection.
3Ease of operation
If large bandwidth is allocated for control channel, then RTS/CTS frame transmission is possible, but network efficiency decreases
Solution Approach 1:
The patent uses minimalistic control frames that occupy only the necessary bandwidth for transmitting timing information (SIFS, DIFS, slot time). These lightweight control signals provide the required operational simplicity for control channel transmission while consuming minimal bandwidth, thereby maintaining high network efficiency for data transmission.
Solution Approach 2:
The patent extracts only the essential timing information from complete RTS/CTS frames, creating simplified control frames that require minimal bandwidth allocation. This extraction maintains the ease of control channel operation while significantly reducing the bandwidth consumed by control traffic, thus preserving network efficiency.
Data Source
AI summary
Methods for reserving a data channel and apparatuses supporting the same are disclosed. A method for reserving a data channel in a wireless access system includes transmitting a request frame for reserving the data channel by a sending node, and receiving a notify frame in response to the request frame during a first time period or a second time period by the sending node. If the notify frame is received during the first time period, the sending node determines that the request frame has been collided, and if the notify frame is received during the second time period, the sending node determines that the data channel has been reserved successfully.