Hierarchical Pilot Structure for Wireless Sector Acquisition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in acquiring sector/system information due to the complexity and overhead of existing pilot structures, which hinder quick and robust acquisition by terminals.
Innovation Solution
The implementation of a hierarchical pilot structure in Time Division Multiplexed (TDM) pilots, where multiple sets of bits for sector/system information are sent across multiple TDM pilots, allowing earlier bits to be used in generating subsequent pilots, reducing acquisition complexity and improving detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pilot structures are used to transmit sector/system information, then the information can be transmitted to terminals, but the acquisition complexity increases and detection performance deteriorates
Solution Approach 1:
The patent segments the sector/system information into multiple groups of bits, where each group is transmitted in a separate TDM pilot. This segmentation allows terminals to acquire information incrementally, reducing the complexity of processing all bits simultaneously while improving detection performance through staged acquisition.
Solution Approach 2:
The patent employs preliminary action by having earlier TDM pilots carry subsets of information bits that are used to generate subsequent TDM pilots. This creates a hierarchical structure where initial pilots prepare the terminal for detecting subsequent pilots, reducing overall acquisition complexity while maintaining reliable detection.
2Reliability
If more bits are transmitted for sector/system information, then the system acquisition is enhanced, but the overhead increases and transmission efficiency decreases
Solution Approach 1:
The patent merges the transmission of sector/system information with the TDM pilot structure itself. Instead of separate information channels, the information bits are embedded within the pilot sequences, combining information transmission with synchronization functions and reducing overall overhead.
Solution Approach 2:
The TDM pilots serve multiple functions simultaneously: they provide synchronization signals, carry sector/system information, and enable hierarchical acquisition. This multi-functionality reduces the need for separate dedicated information channels, thereby reducing overhead while enhancing system acquisition.
3Productivity
If traditional pilot transmission methods are used, then the overhead is managed, but the detection performance and acquisition speed are insufficient
Solution Approach 1:
Earlier TDM pilots carry information bits that are used to generate subsequent TDM pilots, creating a preliminary structure that guides the terminal through hierarchical detection. This preliminary action accelerates acquisition speed by providing incremental guidance while maintaining detection performance through the structured hierarchy.
Solution Approach 2:
The patent introduces dynamics by allowing the TDM pilot structure to adapt hierarchically across multiple time intervals. The pilot generation dynamically depends on previously detected bits, enabling the system to adjust the acquisition process based on terminal detection progress, thereby improving both speed and performance.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Techniques for sending sector/system information in TDM pilots using a hierarchical pilot structure are described. A base station sends multiple sets of bits for the sector/system information in multiple TDM pilots. The set of bits sent in a given TDM pilot may include bits sent in earlier TDM pilots. In one design, the base station generates a first TDM pilot based on a first set of bits, generates a second TDM pilot based on a second set of bits that includes the first set, generates a third TDM pilot based on all bits for the information, and sends the TDM pilots. A terminal performs detection to obtain a first detected value for the first TDM pilot, performs detection based on the first detected value to obtain a second detected value for the second TDM pilot, and performs detection based on the first and second detected values to obtain a third detected value for the third TDM pilot.