Optical Wireless Coordinator Bandwidth Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In optical wireless communications networks, particularly in visible light communication systems, the coordinator faces challenges in determining the correct receiving bandwidth for terminal nodes operating at different bandwidths, leading to inefficient resource utilization and potential bandwidth wastage due to the use of minimum bandwidths during contention-based transmissions.
Innovation Solution
The method involves the use of a request to send (RTS) frame with first indication information that allows the receiving node to determine a second bandwidth for both sending and receiving, enabling each terminal node to use a transmission bandwidth different from the minimum, thereby optimizing bandwidth allocation and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coordinator uses minimum bandwidth for receiving signals during contention-based transmission, then the system ensures compatibility with all terminal nodes, but bandwidth resources are wasted and transmission efficiency deteriorates
Solution Approach 1:
The terminal node performs preliminary action by indicating its sending bandwidth in the RTS frame before actual data transmission. This allows the receiving node to prepare the appropriate receiving bandwidth in advance, avoiding the need to use minimum bandwidth and preventing bandwidth resource waste while ensuring compatibility.
Solution Approach 2:
The system changes the bandwidth parameter dynamically based on terminal node capabilities. The RTS frame carries bandwidth indication information that allows the receiving node to adjust its receiving bandwidth parameter to match the sender's actual bandwidth, rather than always using minimum bandwidth, thus improving transmission efficiency while maintaining compatibility.
2Device complexity
If the coordinator does not know the sending bandwidth of terminal nodes in advance, then the system maintains simplicity in channel access, but the coordinator cannot correctly detect uplink information from terminal nodes with different bandwidths
Solution Approach 1:
The terminal node performs preliminary action by indicating its sending bandwidth in the RTS frame before actual data transmission. This allows the receiving node to prepare the appropriate receiving bandwidth in advance, avoiding the need to use minimum bandwidth and preventing bandwidth resource waste while ensuring compatibility.
Solution Approach 2:
The RTS frame acts as an intermediary that carries bandwidth indication information from the terminal node to the receiving node. This intermediary mechanism enables the receiving node to obtain bandwidth information without increasing channel access complexity, allowing correct detection of uplink information while maintaining simple CSMA/CA-based channel access.
3Stability of the object's composition
If all terminal nodes use the same minimum bandwidth for transmission, then the system ensures uniform communication standards, but terminal nodes with higher bandwidth capabilities cannot utilize their full potential
Solution Approach 1:
The system introduces dynamics by allowing bandwidth to vary based on terminal node capabilities while maintaining a baseline minimum bandwidth standard. The RTS frame carries bandwidth indication information that enables the receiving node to adjust its receiving bandwidth dynamically, allowing terminal nodes with higher bandwidth capabilities to utilize their full potential while ensuring uniform communication standards through the minimum bandwidth requirement.
Solution Approach 2:
The system changes the bandwidth parameter dynamically based on terminal node capabilities. The RTS frame carries bandwidth indication information that allows the receiving node to adjust its receiving bandwidth parameter to match the sender's actual bandwidth, rather than always using minimum bandwidth, thus improving transmission efficiency while maintaining compatibility.
Data Source
Figure 1~2
Figure 3~4B
Figure 4C~6
AI summary
Embodiments of the present invention provide an information transmission method, a coordinator, and a terminal node in an optical wireless communications network. The method includes: determining, by a coordinator, bandwidth information, where the bandwidth information includes a maximum bandwidth supported by and/or a bandwidth currently used by each of M terminal nodes associated with the coordinator, and M is an integer greater than or equal to 1; determining, by the coordinator, based on the bandwidth information, N transmission bandwidths in a one-to-one correspondence with N contention-based transmission time periods, where N is an integer greater than or equal to 1; and sending, by the coordinator, scheduling information to the M terminal nodes, where the scheduling information is used to indicate the N transmission bandwidths and a correspondence between the N transmission bandwidths and the N contention-based transmission time periods. According to the information transmission method in the optical wireless communications network in the embodiments of the present invention, when terminal nodes that may support different bandwidths contend for transmission, the coordinator can determine receiving bandwidths, so as to correctly detect uplink information.