Dynamic Frequency Band Allocation for Cellular-WLAN Coexistence
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Solution Overview
Problem
The existing technologies for sharing frequency bands between cellular systems and wireless local area networks (WLANs often result in a significant reduction in the occasions when the frequency band can be used in the WLAN, due to difficulties in applying centralized control methods in decentralized WLANs and potential interference issues.
Innovation Solution
A device and method that acquire measurement information of the shared frequency band from a WLAN access point and decide on the occupancy time for the cellular system based on this information, ensuring optimal usage of the shared band in both systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the frequency band is used in the cellular system based on centralized control methods, then system throughput is improved, but occasions on which the frequency band can be used in the wireless LAN remarkably decrease
Solution Approach 1:
The patent implements dynamic time division multiplexing where the frequency band is allocated to cellular system or wireless LAN based on real-time measurement information. The base station dynamically adjusts the occupancy time of the frequency band for cellular system according to the channel state information provided by wireless LAN access points, making the allocation flexible rather than static.
Solution Approach 2:
The patent establishes a feedback mechanism where wireless LAN access points provide measurement information about the frequency band usage state to the base station. The base station uses this feedback to decide the occupancy time, and the decision is further adjusted based on acknowledgment information from access terminals about whether the frequency band was actually available for WLAN usage.
2Ease of operation
If the frequency band is used in the cellular system in the contention method, then autonomous operation is maintained, but collisions increase and occasions for WLAN usage decrease
Solution Approach 1:
The patent implements preliminary action by having the base station proactively occupy the frequency band for cellular system before wireless LAN would need to use it. The base station decides the occupancy time in advance based on measurement information from access points, and terminals perform clear channel assessment before accessing the band, preventing collisions before they occur.
3Productivity
If measurement information is acquired from wireless LAN access points, then occupancy time can be optimized, but communication overhead increases
Solution Approach 1:
The patent implements self-service by having wireless LAN access points autonomously provide measurement information about the frequency band usage state to the base station without requiring complex coordination or control mechanisms. The access points independently monitor and report channel conditions, reducing the overhead compared to centralized control methods.
Data Source
AI summary
[Object] To make it possible to suppress a decrease in occasions on which a frequency band shared between a cellular system and a wireless LAN can be used in the wireless LAN.[Solution] There is provided a device including an acquisition unit configured to acquire measurement information of a frequency band shared between a cellular system and a wireless local area network (LAN), the measurement information being provided by an access point of the wireless LAN, and a control unit configured to decide a time for which the frequency band is occupied for the cellular system based on the measurement information.