ER-RTS Packet Channel Reservation for Extended Range Wireless
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Solution Overview
Problem
Conventional RTS/CTS mechanisms fail to effectively reserve transmission channels for extended range communications, leading to frame collisions due to non-ER devices detecting channels as free during ongoing ER transmissions, resulting in data loss.
Innovation Solution
A method and apparatus for wireless communications that involve generating an extended range request-to-send (ER-RTS) packet and transmitting it to reserve a transmission channel, followed by transmitting data after receiving an extended range clear-to-send (ER-CTS) packet, with specific configurations for handling multiple CTS packets and compatibility with IEEE 802.11 protocols to prevent frame collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RTS/CTS mechanism is used for channel reservation, then the transmission protocol remains simple and compatible with existing standards, but the transmission channel cannot be effectively reserved for extended range communications causing frame collisions
Solution Approach 1:
The patent segments the channel reservation process into distinct phases: ER-RTS packet transmission for initial reservation, followed by optional CTS packet transmissions from both ER and non-ER devices. This segmentation allows the system to handle different device types (ER and non-ER) separately while maintaining overall protocol simplicity, resolving the contradiction between effective channel reservation and protocol complexity.
Solution Approach 2:
The ER-RTS packet acts as an intermediary mechanism that enables channel reservation between ER devices without requiring complex modifications to existing RTS/CTS protocols. This intermediary approach allows non-ER devices to participate in the reservation process through standard CTS packets while ER devices use extended range capabilities, thus improving channel reservation effectiveness without significantly increasing protocol complexity.
2Adaptability or versatility
If non-ER devices detect transmission channel using conventional methods, then they can operate independently without ER-specific protocols, but they incorrectly detect channel as free during ongoing ER transmissions causing frame collisions
Solution Approach 1:
The patent implements universality by allowing both ER and non-ER devices to participate in the channel reservation process using their respective protocols. Non-ER devices use standard RTS/CTS while ER devices use ER-RTS and ER-CTS, yet both mechanisms work together to reserve the channel effectively. This multi-functionality enables device compatibility across different types while preventing frame collisions through unified channel reservation.
Solution Approach 2:
The ER-RTS packet is transmitted in advance to reserve the channel before actual data transmission begins. This preliminary action ensures that both ER and non-ER devices are notified of the upcoming transmission, allowing them to set their NAV (network allocation vector) accordingly. This preliminary reservation prevents non-ER devices from incorrectly detecting the channel as free and causes frame collisions.
3Length of stationary object
If extended range transmission is implemented without proper channel reservation, then transmission range is extended, but channel collisions increase leading to data loss
Solution Approach 1:
The patent implements feedback mechanisms through the exchange of ER-RTS and ER-CTS packets between transmitter and receiver. The CTS packets contain feedback information about the channel status and transmission parameters, allowing the transmitter to adjust its transmission strategy. This feedback loop ensures that the transmission channel is properly reserved and managed, preventing collisions and ensuring data reliability over extended ranges.
Data Source
AI summary
Embodiments of a method and apparatus for wireless communications are disclosed. In an embodiment, a wireless device includes a controller configured to generate an extended range request-to-send (ER-RTS) packet and a wireless transceiver configured to transmit the ER-RTS packet to a second wireless device to reserve a transmission channel.