CSMA LTE Coexistence via Channel Reservation
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Solution Overview
Problem
Current technologies require separate frequency channels for coexistence of Carrier-Sense Multiple Access (CSMA) and LTE standards in ad-hoc networks, leading to inefficiencies and increased investment costs due to interference and channel occupancy issues, especially in dynamic broadcast scenarios.
Innovation Solution
A device and method that allow communication using both CSMA and LTE standards in the same frequency channel by broadcasting a channel reservation message indicating communication time slots for each standard, enabling simultaneous use without interference, and allowing for flexible resource distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate frequency channels are provided for CSMA and LTE standards, then interference between the two communication types is limited, but channel occupancy increases and investment costs rise
Solution Approach 1:
The patent merges CSMA and LTE communications into a single frequency channel by implementing a channel reservation mechanism. The LTE device broadcasts a channel reservation message that indicates future time slots it will occupy, allowing CSMA devices to avoid these slots. This combining approach eliminates the need for separate frequency channels while maintaining communication reliability through coordinated access.
Solution Approach 2:
The channel reservation message acts as an intermediary mechanism between LTE and CSMA communications. It conveys information about future LTE transmissions to CSMA devices, enabling them to adjust their channel access behavior. This intermediary message allows both standards to coexist on the same frequency without direct interference.
2Reliability
If separate frequency channels are provided for CSMA and LTE standards, then interference between the two communication types is limited, but investment costs increase
Solution Approach 1:
The patent merges CSMA and LTE communications into a single frequency channel, reducing the number of channels that need to be allocated and managed. This merging approach lowers investment costs by eliminating redundant infrastructure while maintaining communication reliability through the channel reservation mechanism that prevents interference.
3Reliability
If channel reservation messages are broadcast to indicate future time slots, then CSMA devices can avoid interfering with LTE transmissions, but channel occupancy time increases due to the reservation messages themselves
Solution Approach 1:
The channel reservation message implements preliminary action by announcing future LTE transmissions before they occur. This allows CSMA devices to proactively avoid reserving or transmitting during these future slots, preventing interference in advance. The reservation period is set to extend far enough into the future to cover the LTE transmission window while minimizing the impact on overall channel utilization.
Data Source
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AI summary
The invention relates to a device (3) for communicating according to a first and a second communication standard, the first standard being a standard using carrier-sense multiple access (CSMA) and the second being an LTE standard, the LTE standard comprising a device-to-device (D2D) functionality, wherein the device (3) communicates according to the first standard as well as according to the second standard in the same frequency channel (9), broadcasts a channel reservation message (10) in said frequency channel (9), the channel reservation message (10) indicating a length (L1) for communications (8) according to the second standard such that no communications (7) according to the first standard are performed over said length (L1), and communicates according to the second standard over said length (L1) indicated in the channel reservation message (10). The invention further relates to a method for communicating according to a first and a second communication standard.