Uplink Acknowledgement Channel Resource Allocation in OFDM
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Solution Overview
Problem
Current wireless network technologies face challenges in efficiently allocating resources for uplink acknowledgement channels, particularly in orthogonal frequency division multiplexing (OFDM) systems, which can lead to errors due to interference and multipath fading.
Innovation Solution
The proposed solution involves allocating resources for an uplink acknowledgement channel using a configuration that includes three subtiles from each of three different tiles, with each tile comprising a combination of 2×3 and 3×2 subcarriers by OFDM symbols, allowing for distributed resource allocation across time and frequency to reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are allocated for uplink acknowledgement channel in OFDM systems, then the system can transmit acknowledgement signals, but the signals are susceptible to interference and multipath fading
Solution Approach 1:
The resource allocation for the uplink acknowledgement channel is segmented into multiple subtiles distributed across different frequency subcarriers and time OFDM symbols. Instead of using a single concentrated resource block, the acknowledgement channel resources are divided and placed at multiple locations in the frequency-time grid, which disperses the signal across different paths and reduces the impact of multipath fading and interference on any single segment.
2Device complexity
If concentrated resource allocation is used for uplink acknowledgement channel, then resource allocation is simple, but the channel is highly susceptible to interference and fading
Solution Approach 1:
The resource allocation structure is segmented into multiple subtiles that are distributed across frequency and time dimensions. Each subtile represents a portion of the acknowledgement channel resources, and by spreading these segments across different subcarriers and OFDM symbols, the system achieves both manageable allocation complexity and improved reliability through diversity.
Solution Approach 2:
The resource allocation extends from a single-dimension concentrated block into a multi-dimensional distributed pattern across the frequency-time grid. By utilizing both frequency (different subcarriers) and time (different OFDM symbols) dimensions, the system creates a two-dimensional dispersion pattern that provides diversity against fading while maintaining structured allocation.
3Reliability
If distributed resource allocation across time and frequency is used, then interference and multipath fading are reduced, but resource allocation complexity increases
Solution Approach 1:
The distributed resource allocation is achieved through systematic segmentation of the acknowledgement channel into multiple subtiles with defined patterns. The segmentation follows a structured approach where subtiles are placed at specific intervals and positions in the frequency-time grid, which reduces the complexity of managing the distribution while still achieving the benefits of diversity and interference reduction.
Data Source
AI summary
Various example embodiments are disclosed. According to an example embodiment, a technique may include transmitting a message to allocate resources to a mobile station in a wireless network for an uplink acknowledgement channel, the acknowledgement channel including three subtiles including a subtile from each of three different tiles, each of the three tiles including a plurality of subtiles that includes at least one 2×3 subtile that includes two subcarriers by three Orthogonal Frequency Division Multiplexing (OFDM) symbols and at least one 3×2 subtile that includes three subcarriers by two OFDM symbols.