Variable Scan Rate Wireless Terminal for WLAN WiMAX Handover
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Solution Overview
Problem
Existing wireless communication technologies face challenges in seamlessly integrating and managing the coexistence of WLAN and WiMAX networks within a single wireless terminal, due to differences in MAC protocols and resource conflicts, which affects performance and power consumption.
Innovation Solution
A wireless terminal equipped with a radio frequency transceiver and baseband processing circuit that scans for available access points based on movement indications, intermittently switches between WLAN and WiMAX connections, and adjusts scanning rates to minimize power consumption and avoid interference, allowing for simultaneous operation and smooth handovers between networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless terminal scans for access points at a high scan rate, then the availability of wireless connections is improved, but power consumption increases
Solution Approach 1:
The scan rate is made dynamic rather than fixed. The baseband processing circuit adjusts the scan rate based on real-time detection of movement indications from the terminal. When movement is detected, the scan rate increases to ensure connection availability. When the terminal is stationary, the scan rate decreases to reduce power consumption. This dynamic adaptation resolves the contradiction between connection availability and power consumption.
Solution Approach 2:
The scanning parameter (scan rate) is changed based on terminal movement state. The system transitions between different scan rates (high scan rate when moving, low scan rate when stationary) according to the detected movement indications. This parameter change allows the system to optimize both connection availability and power consumption under different operational conditions.
2Adaptability or versatility
If the wireless terminal simultaneously operates with WLAN and WiMAX networks, then network coverage and bandwidth are improved, but resource conflicts and interference increase
Solution Approach 1:
The baseband processing circuit acts as an intermediary that coordinates between WLAN and WiMAX operations. It detects movement indications and uses this information to mediate resource allocation and timing between the two networks. By introducing movement detection as an intermediary factor, the system can dynamically adjust operations to minimize conflicts and interference while maintaining simultaneous connectivity to both networks.
Solution Approach 2:
The simultaneous operation of WLAN and WiMAX is made dynamic through movement-based adaptation. When the terminal is moving, the system dynamically adjusts the timing and resource allocation between networks to prevent interference. When stationary, the system optimizes for maximum bandwidth utilization. This dynamic coordination resolves the contradiction between network versatility and resource conflicts.
3Reliability
If the wireless terminal uses scheduling protocol in WiMAX network, then connection stability is improved, but flexibility in resource allocation is reduced
Solution Approach 1:
The scheduling protocol is made dynamic through movement-based adjustment. When the terminal detects movement indications, the system dynamically adjusts the time slot allocation and scheduling parameters to accommodate changing conditions. This allows the terminal to maintain connection stability through scheduling while gaining flexibility to adapt to movement-induced changes in network conditions and resource requirements.
Data Source
AI summary
A wireless communication terminal includes a radio frequency (RF) transceiver and a baseband processing circuit, which is arranged to detect an indication of a rate of movement of the terminal. The baseband processing circuit is coupled to cause the RF transceiver to scan periodically for access points that are available to communicate with the mobile terminal at a scan rate that is selected responsively to the indication, and upon detecting an available access point, to establish a wireless connection between the terminal and the available access point.