Dual-Mode Wireless Device Transition Management
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Solution Overview
Problem
Current IEEE 802.11 LRLP designs do not effectively manage dual-capable wireless devices that operate in both wideband and narrowband communication modes, leading to issues with maintaining connectivity and efficient power management, particularly during transitions between modes and in discovering narrowband WLANs, which can result in prolonged scanning times and battery consumption.
Innovation Solution
Implementing a process where wireless devices explicitly or implicitly indicate transitions between wideband and narrowband communication modes to the AP, using various indications and messages to manage channel usage and power states, allowing the AP to maintain communication mode information and queue data packets appropriately, thereby ensuring seamless transitions and reduced scanning times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices perform prolonged scanning to discover narrowband WLANs, then discovery reliability is improved, but battery consumption increases
Solution Approach 1:
The patent applies preliminary action by having devices perform wideband scanning first to discover available WLANs, then use the discovered wideband network information to guide subsequent narrowband scanning. This preliminary wideband discovery phase reduces the need for prolonged narrowband scanning across all frequencies, thereby lowering battery consumption while maintaining discovery reliability.
Solution Approach 2:
The patent segments the scanning process into distinct phases: wideband scanning to discover WLANs, followed by targeted narrowband scanning on identified channels. This segmentation allows the device to avoid prolonged scanning across the entire frequency spectrum, reducing energy consumption while ensuring reliable discovery of narrowband networks.
2Reliability
If wireless devices continuously monitor for network transitions, then connectivity reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by having devices transition to narrowband mode at scheduled intervals or based on trigger events rather than continuously monitoring. The device periodically checks for downlink data indications from the wideband network and transitions to narrowband mode only when needed, maintaining connectivity reliability while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent applies self-service by enabling the wireless device to autonomously determine when to transition between wideband and narrowband modes based on received indications from the network. The device monitors for specific downlink data indicators and automatically switches modes as needed, eliminating the need for continuous active monitoring while maintaining reliable connectivity.
3Reliability
If explicit transition indications are implemented between modes, then transition reliability is improved, but communication overhead increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a dedicated narrowband wake-up radio interface that mediates between the wideband network and the device's main radio. This intermediary narrowband interface carries minimal transition indication messages, providing reliable mode transition signaling while keeping communication overhead low through efficient, compact message formats.
4Adaptability or versatility
If dual-capable devices support both wideband and narrowband modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by combining the wideband and narrowband radio interfaces into a single dual-capable device architecture. The device integrates both wideband and narrowband transceivers, processors, and protocol stacks into one unified system, enabling seamless operation in both modes while avoiding the complexity of completely separate independent devices.
Solution Approach 2:
The patent implements universality by designing a dual-capable wireless device that can universally operate in both wideband and narrowband communication modes. The device's radio interface, processor, and protocol handling are designed to support multiple functions and modes, allowing a single device to adapt to different network conditions and requirements without requiring separate specialized hardware for each mode.
Data Source
AI summary
A wireless device sends, to an access point, an indication to the access point that the wireless device is to transition between a wideband communication and a narrowband communication.