Sub-band Selection for Wireless Connection Reliability
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Solution Overview
Problem
Wireless devices often experience inefficient or failed connections due to poor channel conditions during the Random Access Procedure (RACH) in telecommunication systems, leading to suboptimal performance and service quality.
Innovation Solution
An access node selects a sub-band with a signal level that meets specific criteria by instructing the wireless device to transmit signal information, such as a channel quality indicator (CQI) report, to determine the optimal sub-band for communication, ensuring a stable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices use standard RACH procedure without sub-band selection, then the connection process is simple, but the connection reliability deteriorates under poor channel conditions
Solution Approach 1:
The patent divides the frequency band into multiple sub-bands and allows wireless devices to select the most suitable sub-band for RACH transmission. This segmentation enables devices to avoid poor channel conditions in certain frequency regions while maintaining simple connection procedures in good conditions.
Solution Approach 2:
The patent changes the frequency parameter by selecting different sub-bands based on channel conditions. Devices can switch between sub-bands to optimize transmission quality, transforming a static frequency approach into a dynamic parameter selection strategy.
2Reliability
If wireless devices transmit on all sub-bands to find the best signal, then the connection reliability improves, but the signal transmission time increases
Solution Approach 1:
The patent performs preliminary channel quality assessment before the actual RACH transmission. Devices evaluate sub-band conditions in advance and select the optimal sub-band beforehand, avoiding the need to transmit on all sub-bands and thereby reducing time loss.
Solution Approach 2:
Wireless devices autonomously perform sub-band selection based on their own channel quality measurements. This self-service approach eliminates the need for network-controlled trial transmissions across all sub-bands, significantly reducing the time required.
3Productivity
If wireless devices transmit RACH preamble without sub-band selection, then the device complexity is low, but the service quality deteriorates under high load or poor channel conditions
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands, allowing devices to select optimal transmission bands. This segmentation improves service quality by avoiding congested or poor channel regions while keeping device complexity manageable through standardized selection procedures.
Solution Approach 2:
The patent introduces dynamic sub-band selection capability to devices. Rather than static single-band operation, devices can dynamically choose the best sub-band based on current channel conditions, improving productivity without excessive complexity increase.
Data Source
AI summary
Systems and methods are described for sub-band selection for a wireless device during connection. An access node may receive a RACH preamble message from a wireless device. It may be determined that a received signal level associated with the message does not meet a signal level criteria. The wireless device may be instructed to transmit signal information to the access node. A sub-band that comprises a signal level that meets the signal level criteria may be selected. The wireless device may then be instructed to communicate with the access node using the selected sub-band when requesting a connection.