Carrier Preamble Grouping for Wireless Network Entry Latency
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Solution Overview
Problem
Current wireless communication systems, such as WiMAX, face challenges in efficiently allowing mobile stations to access fully configured and partially configured carriers in multiple carrier environments, leading to increased latency during network entry.
Innovation Solution
The solution involves distinguishing between fully configured and partially configured carriers by grouping their preambles separately, allowing mobile stations to efficiently identify and synchronize with fully configured carriers, reducing the need for extensive searches and thereby decreasing network entry latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile stations search through all carriers to identify fully configured carriers in multi-carrier environments, then network entry reliability is improved, but network entry latency increases
Solution Approach 1:
The base station performs preliminary action by pre-grouping preambles according to their associated carrier configurations (fully configured vs. partially configured) and transmitting this grouping information through broadcast messages before mobile stations need to search. This allows mobile stations to directly access the appropriate preamble group without exhaustive search, resolving the contradiction between reliable carrier identification and reduced entry latency
Solution Approach 2:
Preamble grouping information acts as an intermediary that mediates between the base station's carrier configuration and mobile stations' carrier selection. The broadcast message containing preamble group mappings serves as a mediator that guides mobile stations to the correct fully configured carriers without requiring them to search through all carriers, thus maintaining reliability while reducing latency
2Measurement precision
If mobile stations perform exhaustive carrier searches to ensure proper synchronization, then synchronization accuracy is improved, but network entry time increases
Solution Approach 1:
The base station performs preliminary action by organizing preambles into groups associated with specific carrier configurations and broadcasting this grouping information before mobile stations begin their synchronization process. This allows mobile stations to directly access the correct preamble group for fully configured carriers, achieving accurate synchronization without exhaustive search through all carriers
Solution Approach 2:
The preamble space is segmented into distinct groups based on carrier configuration types (fully configured vs. partially configured). This segmentation allows mobile stations to focus their search only on the relevant preamble group for fully configured carriers, maintaining synchronization accuracy while significantly reducing the search space and entry time
Data Source
AI summary
Systems and methods for providing an efficient network entry for a mobile station in RF communications systems with fully configured and partially configured carriers are described. A distinguishing parameter for fully configured carriers is determined. A mobile station receives a carrier and determines whether a fully configured carrier has been received. The mobile station performs synchronization with a base station using the detected fully configured carrier and completes a network entry procedure. In one method embodiment, the distinguishing parameter is a unique preamble characteristic. In another method embodiment, the fully configured carrier frequency is part of messages broadcast by both the fully configured and partially configured carriers. In yet another method embodiment, the carrier raster for fully configured carriers is distinguishable from the carrier raster for partially configured carriers. Latency is reduced for the network entry process for the mobile stations.