Dynamic TDD Mechanism for Small Cell Network Interference
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Solution Overview
Problem
In small cell network deployments, dynamic time division duplex (TDD) mechanisms face challenges such as near-far effects and inter-block interference due to timing misalignments among user equipment (UE) devices, leading to interference issues and inefficient resource utilization.
Innovation Solution
A dynamic TDD mechanism that coordinates scheduling to allocate different resource blocks for downlink (DL) and uplink (UL) traffic, delays UL transmission to mitigate timing misalignments, and supports a dynamic TDD frame structure allowing different UL/DL modes at base stations, ensuring orthogonality of OFDM symbols and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed TDD or FDD resource allocation schemes are applied in small cell deployments, then resource allocation is simplified, but multiple idle subframes occur and resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic TDD resource allocation where the base station can flexibly adjust UL/DL subframe configurations based on real-time traffic conditions. The DL/UL configuration is changed dynamically through signaling (e.g., DCI format 6/7) to match actual traffic demands, transforming the static fixed TDD/FDD scheme into an adaptive dynamic system that eliminates idle subframes and improves resource utilization.
2Productivity
If dynamic TDD is implemented to improve resource utilization, then resource allocation efficiency improves, but timing misalignments among UE devices cause near-far effects and inter-block interference
Solution Approach 1:
The patent applies timing advance adjustments as a preliminary action to compensate for timing misalignments before transmissions occur. The base station calculates and signals timing advance values to UE devices based on their distances and propagation delays, ensuring that UL transmissions from different UEs arrive synchronously at the base station, thereby preventing near-far effects and inter-block interference before they can occur.
Solution Approach 2:
The patent dynamically changes transmission parameters including timing advance values, power levels, and resource block allocations to adapt to varying traffic conditions and mitigate interference. By adjusting these parameters in real-time based on channel conditions and traffic demands, the system maintains orthogonality and reduces interference while preserving dynamic resource allocation efficiency.
3Adaptability or versatility
If dynamic TDD with frequent UL/DL mode switching is implemented, then resource flexibility improves, but UE device complexity and power consumption increase due to tracking requirements
Solution Approach 1:
The patent implements self-service mechanisms where the base station proactively signals UL/DL configuration changes and timing advance adjustments to UE devices through downlink control information. Instead of requiring UEs to continuously track and determine configurations autonomously, the base station provides the necessary configuration information directly, reducing UE device complexity and power consumption while maintaining resource flexibility.
4Object-affected harmful factors
If UL transmission is delayed to mitigate timing misalignments, then interference is reduced, but transmission latency increases
Solution Approach 1:
The patent dynamically adjusts the timing advance parameter based on real-time traffic conditions and channel state information. Rather than applying fixed delays, the system optimizes timing advance values to achieve just enough synchronization to prevent interference while minimizing unnecessary latency. This parameter optimization allows the system to balance interference reduction with transmission latency requirements.
Data Source
AI summary
A dynamic time division duplex (TDD) mechanism for small cellular networks is disclosed. The mechanism dynamically allocates radio resource usage with commensurate increases in throughput and reductions in latency. For example, scheduling data comprising scheduling information data can be received by a device, wherein the scheduling information data comprises uplink allocation data. Then the device can switch from a first mode to a second mode as a function of the uplink allocation data, and transmission data can be transmitted in a subframe of a frame by skipping a resource allocated for the scheduling information data.