Wireless Signal Preamble Design for Interference Reduction
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Solution Overview
Problem
Heterogeneous wireless access networks face interference issues due to unplanned or semi-planned deployments of base stations, leading to poor geometrical conditions and inefficient resource utilization, especially when restricted access base stations coexist with general access stations, causing interference and authorization challenges for mobile devices.
Innovation Solution
Incorporating a preamble in wireless signals with information identifying the type of base station, such as a unique or semi-unique sector ID, and indicating whether it's a general or restricted access station, along with scheduling information, to facilitate efficient communication and reduce interference by allowing terminals to determine access authorization and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If base stations are deployed in heterogeneous networks without centralized planning, then network deployment flexibility and speed are improved, but interference between base stations increases and resource utilization becomes inefficient
Solution Approach 1:
The patent applies preliminary action by having base stations pre-indicate their access types (general access or restricted access) and resource allocations through preambles before actual data transmission begins. This allows mobile devices to pre-determine which base stations they are authorized to access and which resources to monitor, preventing interference issues before they occur. The preamble contains advance information about base station type and resource scheduling, enabling devices to make informed decisions about connection and resource usage prior to actual communication.
2Measurement precision
If mobile devices monitor all base station signals to determine access authorization, then access control accuracy is improved, but processing power consumption increases
Solution Approach 1:
The patent applies the taking out principle by extracting and separating the access control information into a dedicated preamble portion that is distinct from the main data transmission. Mobile devices only need to monitor this extracted preamble content to determine base station access authorization, rather than processing all signal components. The preamble contains specifically extracted information about base station type and resource allocations, allowing devices to make access decisions with minimal processing of the full signal.
Solution Approach 2:
The patent applies partial action by having mobile devices perform selective monitoring - they only monitor the preamble portion containing access control information and only for base stations of the relevant type (general or restricted access). Devices do not need to fully process or analyze all base station signals, but only the pertinent preamble information that enables access determination. This partial monitoring approach maintains accurate access control while significantly reducing processing requirements compared to monitoring all signal components.
3Productivity
If preambles contain detailed base station type and resource allocation information, then communication efficiency is improved, but preamble complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the preamble into distinct functional portions, each carrying specific types of information. The preamble is segmented to include separate elements for base station type identification (general access vs. restricted access) and resource allocation indications. This segmented structure allows the system to convey detailed information efficiently while maintaining clear organization, reducing the complexity burden by structuring information in discrete, manageable segments rather than a monolithic preamble.
Data Source
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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, the information 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.