Coordinated Neighbor Discovery for Wireless Access Points
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Solution Overview
Problem
Current radio scan techniques in wireless communication networks are inadequate for detecting neighbor radio access points (RAPs) with overlapping coverage areas, leading to impaired handover capabilities, especially in scenarios where RAPs are too far apart to detect each other at normal power levels, resulting in inefficient resource usage and battery drain.
Innovation Solution
A coordinated neighbor discovery process is implemented, where RAPs transmit signals at maximum power during designated intervals, allowing them to detect overlapping neighbors, and a controller apparatus manages the process to generate accurate neighbor lists, including macro cell towers, ensuring seamless handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RAPs transmit signals at normal power levels, then energy consumption is reduced, but detection range is insufficient to identify overlapping neighbor RAPs
Solution Approach 1:
The system implements periodic neighbor discovery sessions where RAPs transmit signals at maximum power levels only during designated time intervals, rather than continuously. This periodic maximum-power transmission allows RAPs to detect overlapping neighbors while minimizing overall energy consumption by maintaining normal power levels during non-discovery periods.
Solution Approach 2:
The controller coordinates neighbor discovery sessions in advance, scheduling specific time intervals for maximum-power transmissions. This preliminary coordination ensures that RAPs know when to transmit at maximum power, allowing them to detect neighbors before handover decisions are made, thus improving detection capability without continuous high energy consumption.
2Measurement precision
If RAPs transmit at maximum power continuously, then all neighbor RAPs are detected, but resource wastage increases and battery life decreases
Solution Approach 1:
The system uses periodic neighbor discovery sessions with coordinated time intervals where RAPs transmit at maximum power only when needed for detection. This eliminates continuous maximum-power transmission, thereby preventing resource wastage and preserving battery life while maintaining accurate detection of neighbor RAPs during the discovery sessions.
Solution Approach 2:
Each RAP device autonomously participates in coordinated discovery sessions by transmitting at maximum power only during its assigned time interval and listening during other intervals. This self-service approach ensures accurate mutual detection of neighbors without requiring continuous maximum-power transmission from all devices, thus reducing overall resource wastage.
3Reliability
If current radio scan techniques are used, then device complexity is low, but handover capability is impaired due to inability to detect overlapping coverage areas
Solution Approach 1:
A controller apparatus acts as an intermediary to coordinate neighbor discovery sessions among RAPs. The controller schedules and manages the maximum-power transmission intervals, enabling reliable detection of overlapping coverage areas and improving handover capability. This centralized coordination adds some complexity but ensures reliable neighbor detection that simple autonomous scans cannot achieve.
Solution Approach 2:
The system dynamically adjusts transmission power levels based on the discovery phase - using maximum power during coordinated discovery sessions to ensure reliable neighbor detection, and normal power during regular operation. This dynamic power adjustment improves handover capability by ensuring accurate neighbor identification when needed, while managing the complexity through standardized power control mechanisms.
Data Source
AI summary
Techniques are provided for coordinated neighbor discovery in a wireless network served by radio access point devices that provide service in relatively small coverage areas in the wireless network. A controller apparatus sends to radio access point devices, data identifying a group of radio access point devices to which each radio access point device is assigned. The controller apparatus sends coordinating data for a neighbor discovery session during which a particular radio access point device in the group is configured to transmit a signal at maximum power during a time interval while all other radio access point devices in the group are configured to attempt to receive the signal, and to repeat the same during other time intervals during the neighbor discovery session when a different particular radio access point is configured to transmit a signal at maximum power until all of the radio access point devices in a group have transmitted. Each radio access point device generates discovery results data for signals received from one or more other radio access point devices during the neighbor discovery session. A neighbor list is generated for each radio access point device based on the discovery results. The neighbor list comprises a list of identifiers of radio access point devices that are candidates for handover of service.