Interleaved Contiguous Uplink Coexistence via Bandwidth Segmentation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating resources for coexistence of interleaved and contiguous uplink transmissions within shared radio frequency spectrum bands, particularly due to bandwidth occupancy and power spectral density limitations, which restrict flexibility in waveform types and lead to inefficient time division multiplexing.
Innovation Solution
The system splits the carrier bandwidth into regions for interlaced and contiguous resource allocations, allowing base stations to indicate waveform types, transmission carrier bandwidth, and resource allocations, using interlace patterns defined by resource units such as resource blocks or tones, and employing techniques like DFT-S-FDMA and Zadoff-Chu spreading to manage power and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different UEs use different waveform types (interleaved and contiguous) for uplink transmissions within the same carrier bandwidth, then waveform flexibility and adaptability are improved, but resource allocation complexity and difficulty of detecting and measuring increase
Solution Approach 1:
The carrier bandwidth is divided into multiple bandwidth regions, with each region configured for specific waveform types (interleaved or contiguous). This segmentation allows different UEs to use different waveform types within the same carrier while simplifying resource allocation within each region, as the base station can indicate waveform type, transmission bandwidth, and resource allocations on a per-region basis.
2Reliability
If bandwidth occupancy requirements are enforced (e.g., transmissions must span at least a minimum percentage of available bandwidth), then power spectral density limits are managed, but waveform type flexibility and adaptability are restricted
Solution Approach 1:
Different bandwidth regions are configured with different properties - some regions are configured for interleaved waveforms with specific bandwidth occupancy requirements, while other regions are configured for contiguous waveforms with different requirements. This allows each region to optimize for its specific waveform type while the overall system maintains PSD compliance across the entire carrier bandwidth.
3Ease of operation
If time division multiplexing is used to manage different waveform types, then resource allocation becomes simpler, but transmission efficiency and productivity decrease
Solution Approach 1:
Instead of managing different waveform types solely in the time domain through TDM, the system introduces frequency domain segmentation by dividing the carrier bandwidth into multiple regions. This allows concurrent transmissions of different waveform types in different frequency regions within the same time interval, thereby improving transmission efficiency while maintaining manageable resource allocation through base station indications.
Data Source
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AI summary
A wireless communication system may allocate uplink resources to configure coexisting interleaved and contiguous uplink transmissions. Operation using different waveform types may address bandwidth occupancy requirements, power spectral density (PSD) limitations, etc. A carrier bandwidth may be split into regions allocated for interlaced resource allocations and contiguous resource allocations for frequency division multiplexing (FDM) based coexistence. To achieve coexistence of such waveform types, a base station may indicate a waveform type, a transmission carrier bandwidth or channel, and a resource block allocation (e.g., an interlace pattern, certain ranges within the carrier bandwidth, etc.) for uplink transmissions. In some cases, channel contention procedures (e.g., Listen Before Talk (LBT)) and power constraints (e.g., power spectral density (PSD) limitations) may be based on the waveform type associated with the uplink transmission. A base station may allocate frequency resources of an uplink TTI to multiple UEs, which may operate according to different waveform types.