Wireless Signal Preamble Design for Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Heterogeneous wireless access networks face interference issues due to unplanned or semi-planned deployments of base stations with varying transmit powers, leading to poor geometrical conditions and inefficiencies in resource utilization, especially when restricted access base stations coexist with general access base stations.
Innovation Solution
The solution involves transmitting a preamble with information identifying the type of base station, such as a general or restricted access base station, and reserving specific wireless signal resources to reduce interference. This includes using unique or semi-unique sector IDs and blanking portions of the communication bandwidth to minimize interference, allowing terminals to determine access authorization and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If base stations are deployed in heterogeneous networks with varying transmit powers, then network coverage and capacity are improved, but interference between base stations increases
Solution Approach 1:
The patent segments the wireless communication system into different types of base stations (macro BS, micro BS, femto BS) with different transmit powers and access restrictions. Each base station type operates in specific time-frequency resources, dividing the overall system into manageable segments that reduce mutual interference while maintaining comprehensive network coverage.
Solution Approach 2:
The patent applies local quality by assigning different transmit powers, access restrictions, and resource allocations to different base station types based on their specific deployment scenarios. Macro BS uses high power for wide coverage, while femto BS uses low power for localized coverage, optimizing performance for each local environment.
2Reliability
If terminals monitor all base station signals, then access authorization can be determined, but processing power and battery life are reduced
Solution Approach 1:
The patent implements preliminary action by including access restriction information in the preamble of downlink signals. Terminals can determine whether to access a base station by monitoring only the preamble, which contains pre-configured access authorization information, rather than continuously monitoring all subsequent signal portions. This preliminary determination significantly reduces processing requirements and power consumption.
3Ease of operation
If control information is separated from traffic channels, then receiver processing is reduced, but signal structure complexity increases
Solution Approach 1:
The patent segments the wireless signal into distinct control portions (preamble) and traffic portions. The preamble contains acquisition information, control channel information, and pilot information, while subsequent time frames carry traffic data. This segmentation allows receivers to first process the compact control portion to determine signal relevance, avoiding the need to process entire traffic channels when not needed.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Providing for management of wireless communications in a heterogeneous wireless access point (AP) environment is described herein. By way of example, system data of an over-the-air message can be configured to include information identifying a distinct type of transmitting base station. In some aspects, the information can include an access type of the base station and/or a sector ID for distinguishing the base station among large numbers of other base stations. According to other aspects, system data transmitted on the wireless signal can include wireless channel resources designated for a particular type of base station, or blanked by the transmitting base station, to facilitate interference reduction on such resources. By employing aspects of wireless communication management disclosed herein, efficient and reliable communication can be affected in large heterogeneous AP networks.