Dynamic Preamble Scheduling for Wireless Base Station Interference
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Solution Overview
Problem
In semi-planned or unplanned wireless access networks, interference between base stations of different transmit powers and access types is significant, leading to challenges in detecting and communicating with the correct base station due to strong signal interference from high-power transmitters and restricted access base stations.
Innovation Solution
Dynamic preamble re-use scheduling is employed, where base stations allocate and transmit preambles in different signal resources over time, with high-power stations blanking designated portions to reduce interference, and low-power stations using reserved resources, allowing terminals to decode weaker signals by monitoring multiple resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If base stations transmit preambles simultaneously on the same signal resources, then system simplicity is maintained, but preamble collisions and interference between base stations of different transmit powers increase significantly
Solution Approach 1:
The patent segments signal resources into multiple sets (first set, second set, third set) with different re-use patterns. Base stations are divided into groups (first group, second group, third group) with distinct preamble transmission schedules. This segmentation prevents simultaneous transmissions on the same resources, eliminating preamble collisions while maintaining manageable scheduling complexity through structured resource allocation.
Solution Approach 2:
The patent implements dynamic preamble re-use scheduling where base stations switch between different signal resources over time. The scheduler dynamically assigns preambles to different resource sets based on base station type and current transmission requirements. This dynamic approach allows the system to adapt to varying network conditions and base station deployments, preventing collisions while optimizing detection reliability.
2Area of stationary object
If high-power base stations transmit preambles on all signal resources, then transmission coverage is maximized, but interference with low-power base stations and restricted access base stations increases
Solution Approach 1:
The patent applies local quality by assigning different transmission characteristics to different base station groups. High-power base stations in the first group transmit on first signal resources, while low-power base stations in the second group transmit on second signal resources. Restricted access base stations in the third group use third signal resources. This localized resource allocation ensures that each base station type receives appropriate transmission parameters, preventing high-power stations from interfering with lower-power stations while maintaining their respective coverage areas.
3Measurement precision
If terminals monitor all signal resources for base station detection, then detection completeness is improved, but processing time and power consumption increase
Solution Approach 1:
The patent segments the detection process by organizing signal resources into distinct sets with different re-use patterns. Terminals can systematically search through these segmented resources in a structured manner rather than randomly scanning all resources. The segmentation into first, second, and third signal resource sets with associated base station groups enables terminals to efficiently locate preambles by following the established scheduling patterns, reducing detection time while maintaining completeness.
Solution Approach 2:
The patent implements preliminary action through pre-established preamble re-use schedules and resource allocation patterns. Before actual detection occurs, the system has predetermined which resources will be used by which base station types. Terminals can use this预先 information to guide their detection process, knowing in advance which resources to monitor first and which base stations are most likely to be detected, thereby reducing search time and power consumption while maintaining detection precision.
Data Source
AI summary
Providing for base station (BS) acquisition in semi-planned or unplanned wireless access networks is described herein. By way of example, a signal preamble can be dynamically allocated to wireless signal resources, such that the preamble is scheduled to different resource(s) across different cycles of the signal. Dynamic allocation can be pseudo-random, based on collision feedback, or determined by a suitable algorithm to mitigate collisions from a dominant interferer. In addition, dynamic scheduling can be particular to a type of BS to significantly reduce collisions from BSs of disparate types. In at least one aspect, a preamble resource can be sub-divided into multiple frequency sub-carrier tiles. Control channel information can be transmitted on each tile of a group of such tiles, further mitigating effects of a dominant interferer on a subset of the tile group.