Backoff Method for 5G Unlicensed Band Overprotection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of 5G mobile communication, the overprotection problem arises when devices back off for an extended period even if a clear to send (CTS) transmission fails, leading to inefficiencies in data transmission and access to unlicensed frequency bands.
Innovation Solution
A backoff method and apparatus that include sending a C-CTS frame with a first time delay after receiving a CTS frame, and carrying backoff time periods in RTS and CTS frames to ensure that other devices only back off based on valid transmission times, preventing unnecessary backoffs when CTS is not successfully sent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices back off for a long time after LBT is successfully conducted, then channel protection is improved, but transmission efficiency deteriorates due to overprotection when CTS transmission fails
Solution Approach 1:
The backoff mechanism is made dynamic by introducing multiple backoff time periods (first backoff time period in RTS frame, second backoff time period in C-CTS frame) with different durations. The system adapts the backoff duration based on the actual transmission status - using the shorter first backoff time period when CTS transmission fails, and the longer second backoff time period when transmission succeeds, thereby resolving the contradiction between channel protection and transmission efficiency
Solution Approach 2:
The invention changes the backoff time period parameter from a single fixed value to multiple variable values. By carrying different backoff time periods in different frames (RTS and C-CTS) and selecting appropriate values based on transmission outcomes, the system optimizes the balance between protecting the channel and maintaining transmission efficiency
2Ease of operation
If other devices back off based on RTS frame, then channel access control is improved, but unnecessary backoff occurs when CTS transmission fails
Solution Approach 1:
The invention implements a feedback mechanism where the receiving device sends back a CTS frame that includes a second backoff time period. This feedback allows the sending device to adjust the backoff duration based on whether the CTS transmission was successful. If CTS transmission fails, the system uses only the first backoff time period, avoiding unnecessary extended backoff and reducing time loss
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present application discloses a backoff method and apparatus in a transmission process, a device, a system, and a storage medium, which relate to the field of communication technology. The method includes: a transmitting device performing LBT in an unlicensed frequency band; the transmitting device transmitting an RTS to a receiving device when the LBT has been successfully performed, the RTS including a first backoff time period; the transmitting device transmitting, after having received a CTS transmitted by the receiving device, a C-CTS to the receiving device, the C-CTS including a second backoff time period. In this technical solution, other monitoring devices in the surroundings perform time-division backoff according to the first backoff time period and the second backoff time period, and when the transmitting of the CTS fails, the backoff needs to be performed simply according to the first backoff time period, thereby solving the problem in the related art that after the receiving device fails to transmit the CTS, other devices around the transmitting device still perform backoff for a long time according to a monitored NAV of the RTS, resulting in overprotection.