Uplink Control Pilot Signal Density Adaptation
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Solution Overview
Problem
Existing wireless communication networks face challenges in minimizing pilot signal overhead during uplink operations, particularly in orthogonal frequency division multiplexed (OFDM) networks, which can lead to data loss due to interference across sub-channels.
Innovation Solution
A method and system for providing an uplink control structure with adaptive pilot symbol density and allocation, allowing for efficient channel estimation and data demodulation by adjusting pilot symbol spacing and density based on resource block sizes, thereby reducing overhead and improving channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed pattern pilot symbols are used for preselected resource block sizes, then channel estimation can be performed, but pilot signal overhead is excessive and cannot be adapted to different resource block sizes
Solution Approach 1:
The patent implements dynamic pilot symbol allocation where the density and position of pilot symbols are adjusted based on the actual resource block size. Instead of using a fixed predefined pattern, the system dynamically determines pilot symbol locations to match the allocated resource blocks, thereby adapting to different sizes while minimizing overhead.
Solution Approach 2:
The patent changes the parameters of pilot symbol allocation (density, spacing, position) based on resource block size. By varying these parameters dynamically, the system achieves adaptability to different resource block configurations while optimizing the pilot signal overhead to be minimal yet sufficient for channel estimation.
2Measurement precision
If pilot symbol density is increased to improve channel estimation accuracy, then measurement precision improves, but signal overhead and resource consumption increase
Solution Approach 1:
The patent applies local quality by concentrating pilot symbols in specific regions or patterns that are most critical for channel estimation, rather than uniformly distributing them. This allows achieving high measurement precision in key areas while reducing overall pilot symbol density and minimizing total overhead.
Solution Approach 2:
The patent uses partial action by allocating pilot symbols only where necessary for effective channel estimation, rather than uniformly across all resource blocks. This selective approach maintains sufficient estimation accuracy while reducing the total quantity of pilot signals required.
3Productivity
If resource blocks are allocated to support high data rates, then productivity increases, but interference across sub-channels increases causing data loss
Solution Approach 1:
The patent implements feedback mechanisms where channel estimation results from pilot symbols are used to adjust resource allocation and modulation schemes. This feedback loop allows the system to maintain high data rates while compensating for interference effects, thereby preserving data integrity and reducing data loss.
Solution Approach 2:
The patent performs preliminary channel estimation using pilot symbols before actual data transmission. This preliminary action allows the system to identify and mitigate potential interference issues in advance, enabling high-speed data transmission with reduced risk of data loss from interference.
Data Source
AI summary
A method and system are provided having an uplink control structure and a pilot signal having minimal signal overhead for providing channel estimation and data demodulation in a wireless communication network. The uplink control structures enable mobile terminals to communicate with corresponding base stations to perform various functions including obtaining initial system access, submitting a bandwidth request, triggering a continuation of negotiated service, or providing a proposed allocation re-configuration header. A dedicated random access channel is provided to communicatively couple the base station and the mobile terminal so that the mobile terminal can select a random access signaling identification. A resource request is received at the base station to uplink resource information from the mobile terminal and an initial access information request is received from the mobile terminal to configure the base station connection. Pilot signals with varying density configurations are provided to include low density symbol patterns for multiple contiguous resource blocks and high density symbol patterns for single resource blocks.