Adaptive Uplink Downlink Bandwidth Coordination in LTE FDD
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing radio communication systems, particularly in LTE FDD, suffer from inefficient frequency spectrum utilization due to fixed bandwidth configurations, leading to idle uplink or downlink bandwidths, which reduces overall spectrum utilization and does not account for asymmetric uplink and downlink traffic patterns.
Innovation Solution
A method and device for adaptively adjusting uplink and downlink bandwidth by a base station, which counts bandwidth usage, determines required changes, and communicates these changes through a logical channel message to terminals, allowing dynamic coordination and allocation of Resources Blocks (RBs) between uplink and downlink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If symmetric uplink and downlink bandwidth configuration is adopted in LTE FDD system, then system configuration simplicity is maintained, but frequency spectrum utilization rate decreases due to idle uplink bandwidth and insufficient downlink bandwidth
Solution Approach 1:
The patent implements dynamic bandwidth adjustment by allowing the base station to flexibly allocate uplink and downlink bandwidth according to actual traffic conditions. The bandwidth configuration changes from static to dynamic, enabling the system to adapt to varying traffic demands and improve spectrum utilization without requiring complex cognitive radio architectures.
Solution Approach 2:
The patent changes the bandwidth allocation parameters by introducing flexible bandwidth configuration mechanisms. The base station can adjust the bandwidth parameters based on traffic conditions, transforming the fixed bandwidth parameters into variable parameters that can be optimized for different traffic scenarios.
2Stability of the object's composition
If fixed network configuration is adopted, then system stability is maintained, but frequency spectrum utilization efficiency cannot be optimized under asymmetric traffic conditions
Solution Approach 1:
The patent introduces dynamic bandwidth adjustment capabilities while maintaining overall system stability. The base station can flexibly allocate bandwidth resources according to traffic conditions, enabling the system to adapt to changing demands without compromising stability. This dynamic adjustment mechanism allows the network to optimize spectrum utilization under asymmetric traffic conditions.
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors traffic conditions and adjusts bandwidth allocation accordingly. This feedback loop enables the system to respond to changing traffic patterns, optimizing spectrum utilization while maintaining stable operation through controlled adjustments.
3Productivity
If cognitive radio technology is implemented for dynamic network adjustments, then frequency spectrum utilization can be improved, but base station and terminal complexity increases significantly and new network elements are required
Solution Approach 1:
The patent achieves dynamic bandwidth adjustment through simplified mechanisms that do not require complex cognitive radio architectures. The base station implements flexible bandwidth allocation based on traffic conditions, providing dynamic spectrum utilization improvement without the need for new network elements or significant increases in device complexity.
Solution Approach 2:
The patent uses lightweight, simple bandwidth adjustment mechanisms rather than complex cognitive radio systems. The solution employs basic feedback and allocation algorithms that can be implemented with minimal additional complexity, avoiding the need for expensive or complex network elements while still achieving dynamic spectrum optimization.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention discloses a method for adaptively adjusting uplink and downlink bandwidth, which includes: a base station counting a usage status of the uplink and downlink bandwidth in a preset time, and obtaining a bandwidth amount ΔBWDL required to be coordinated of downlink bandwidth and a bandwidth amount ΔBWUL required to be coordinated of uplink bandwidth; the base station determining a direction, amount and location of the required change of the uplink and downlink bandwidth according to the obtained ΔBWDL and ΔBWUL; the base station carrying the determined direction, amount and location of the required change of the uplink and downlink bandwidth through residual ten bits in a logical channel message corresponding to a Physical Broadcast Channel (PBCH) and informing a terminal of the direction, amount and location. The present invention also discloses a device for adaptively adjusting the uplink and downlink bandwidth. With the present invention, utilization efficiency of frequency spectrum in a Long Term Evolution Frequency Division Duplex (LTE FDD) system is improved.