Wideband LTE Single-OFDM-Symbol Uplink Data-Pilot Segmentation for Coverage
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Solution Overview
Problem
Current LTE systems face challenges in uplink coverage and latency due to increased subcarrier spacing, leading to reduced energy reception at user equipment and inefficient use of time/frequency system resources, especially for physical uplink control channels, which are exacerbated by deep fading and interference in heterogeneous networks.
Innovation Solution
Divide frequency resources within a single OFDM symbol into two sets, one for data transmission and one for pilot signals, ensuring interleaved coverage of the entire bandwidth, and utilize a hybrid encoder structure for efficient encoding and modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If increased subcarrier spacing is used in LTE uplink transmission, then bandwidth efficiency is improved, but uplink coverage deteriorates due to reduced energy reception at user equipment
Solution Approach 1:
The frequency resources within a single OFDM symbol are segmented into two distinct sets: one set dedicated for data transmission and another set for pilot signal transmission. This segmentation allows the system to maintain high bandwidth efficiency through increased subcarrier spacing while ensuring reliable uplink coverage by concentrating pilot signals in dedicated frequency resources for accurate channel estimation and compensation of deep fading effects
2Loss of time
If single OFDM symbol transmission is used, then latency is reduced, but resource utilization efficiency deteriorates due to insufficient time/frequency resources for control channels
Solution Approach 1:
The patent transitions from traditional time-domain resource allocation (using multiple OFDM symbols) to frequency-domain resource allocation within a single OFDM symbol. By dividing frequency resources into data and pilot sets, the system achieves ultra-low latency single-symbol transmission while maintaining efficient resource utilization through sophisticated frequency-domain multiplexing and interleaved resource block allocation
3Object-affected harmful factors
If frequency resources are divided into data and pilot sets, then interference management is improved, but system complexity increases due to resource division and interleaved structure
Solution Approach 1:
Different frequency resource sets are assigned different functional qualities: one set optimized for data transmission with specific modulation and coding schemes, and another set optimized for pilot signals with dedicated reference signal structures. This local quality differentiation enables targeted interference management strategies for each resource type while maintaining overall system simplicity through standardized LTE frame structures and resource block allocations
Data Source
AI summary
An embodiment method for managing uplink transmission includes dividing, by a network controller, frequency resources in a single OFDM symbol into two sets of frequency resources. The method further includes signaling, by the network controller, to a UE to transmit data in a first set of the frequency resources and to transmit a pilot signal in a second set of the frequency resources.