TDD Subband Configuration for RACH Capacity and CLI Mitigation
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Solution Overview
Problem
The existing TDD communication systems face challenges in managing Cross-Link Interference (CLI) and interference due to atmospheric conduits, especially in high-frequency spectrum environments, which affect UL coverage, delay, and system capacity, particularly in re-modeled TDD cells with dynamic traffic demands.
Innovation Solution
Re-modeling TDD cells to introduce cell-level Subband Non-overlapping Full Duplex (SBFD) technology, configuring UL and DL subbands within TDD cells to enhance Random Access Channel (RACH) capacity and reduce delay, while managing CLI through network and terminal device coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD cells use high-frequency spectrum for communication, then system capacity and service requirements are met, but Cross-Link Interference and atmospheric conduit interference increase, affecting UL coverage and reliability
Solution Approach 1:
The patent divides the frequency band into separate UL subband and DL subband within the TDD cell, allowing independent configuration and management of uplink and downlink resources. This segmentation enables targeted optimization of each subband to mitigate interference while maintaining overall system capacity.
Solution Approach 2:
The patent applies different quality characteristics to different frequency subbands by configuring specific parameters for UL subband and DL subband separately. This allows local optimization of each subband's transmission characteristics to combat interference in high-frequency spectrum while preserving system-wide productivity.
2Adaptability or versatility
If TDD cells are re-modeled to adapt to dynamic traffic demands, then service requirements are met, but device complexity and configuration management difficulty increase
Solution Approach 1:
The patent enables dynamic TDD cell re-modeling where UL and DL subbands can be flexibly configured and reconfigured based on real-time traffic demands. The system supports dynamic switching between different TDD patterns and subband allocations, allowing adaptation to varying service requirements without fixed constraints.
Solution Approach 2:
The patent creates a universal TDD cell configuration framework that can handle multiple service types and traffic patterns through a single set of configurable parameters. The subband configuration system provides multi-functional capability to support diverse services while maintaining manageable complexity through standardized configuration procedures.
3Productivity
If UL subband is configured for RACH transmission in TDD cells, then RACH capacity increases and delay is reduced, but interference management complexity increases
Solution Approach 1:
The patent separates RACH transmission into a dedicated UL subband, isolating random access signals from other uplink transmissions. This segmentation concentrates RACH resources in a specific frequency region, increasing RACH capacity and reducing access delay while enabling targeted interference management strategies for the RACH subband.
Solution Approach 2:
The patent introduces network device coordination as an intermediary mechanism to manage interference in the UL subband used for RACH. The network device monitors and adjusts subband configurations to mitigate interference, simplifying the overall interference management complexity while maintaining high RACH capacity.
Data Source
AI summary
The communication methods, and a terminal device are provided. A communication method includes following operations. A terminal device receives first configuration information sent by a network device, the first configuration information is used for configuring an uplink sub-band and/or a downlink sub-band for a TDD cell, the uplink sub-band is at least used for RACH transmission, and the downlink sub-band is at least used for transmission of a downlink common signal and/or common information.