Downlink Transmission Rank Adaptation for Inter-Cell Interference Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing rank in wireless communication systems leads to higher interference between cells, particularly in downlink transmission, affecting the physical downlink shared channel and demodulation reference signal of other users.
Innovation Solution
A communication method and apparatus that reduces interference by adjusting the rank and spatial multiplexing streams for terminal devices, considering channel states and resource block utilization to ensure effective downlink data transmission while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rank is increased to improve throughput performance, then the system throughput is improved, but the interference to physical downlink shared channel and demodulation reference signal of other users increases
Solution Approach 1:
The patent dynamically adjusts the rank parameter based on channel conditions and interference levels. When interference is detected or channel conditions deteriorate, the rank is reduced from a higher value (e.g., Rank 4) to a lower value (e.g., Rank 2 or Rank 1), thereby reducing interference to other users while maintaining acceptable throughput performance.
Solution Approach 2:
The rank is not fixed but dynamically changed according to real-time channel state information and interference conditions. The system transitions between different rank states based on measured channel quality, making the spatial multiplexing configuration adaptive to current system conditions rather than static.
2Object-generated harmful factors
If the rank is reduced to decrease interference to other users, then the interference level is reduced, but the throughput performance of the system decreases
Solution Approach 1:
The rank parameter is adjusted based on channel conditions and interference measurements. When channel quality is good and interference is low, the system maintains a higher rank to maximize throughput. When interference increases or channel conditions worsen, the rank is reduced to protect overall system performance while maintaining acceptable throughput for individual users.
Solution Approach 2:
The system dynamically switches between different rank configurations to balance throughput and interference. This dynamic adjustment allows the system to optimize performance in real-time, transitioning between high-throughput modes (higher rank) and low-interference modes (lower rank) based on current conditions.
3Productivity
If the quantity of spatial multiplexing streams is increased to improve data transmission capacity, then the downlink transmission capacity is improved, but the beam deflection angle increases causing stronger interference to neighboring cells
Solution Approach 1:
The patent adjusts the quantity of spatial multiplexing streams (rank) based on beam deflection angles and interference measurements. When beam deflection causes strong interference to neighboring cells, the system reduces the number of spatial streams, thereby reducing the overall interference impact while maintaining sufficient transmission capacity through alternative means such as resource block allocation.
Solution Approach 2:
The quantity of spatial multiplexing streams is dynamically adjusted according to the beam configuration and interference environment. The system adapts the number of streams based on real-time measurements of beam deflection and neighboring cell interference, allowing flexible optimization between capacity and interference reduction.
4Productivity
If the quantity of resource blocks is increased to support higher rank transmission, then the data transmission capacity is improved, but the resource block utilization efficiency decreases when rank reduction is needed
Solution Approach 1:
The patent dynamically adjusts resource block allocation based on the actual rank being transmitted. When the rank is reduced, the system reconfigures resource block allocation to match the lower number of spatial streams, thereby improving resource utilization efficiency. This dynamic reconfiguration prevents waste of allocated resources while maintaining the ability to support higher ranks when conditions permit.
Solution Approach 2:
The system changes resource block allocation parameters in response to rank adjustments. When rank is reduced to lower interference, the resource block configuration is updated to reflect the actual transmission requirements, optimizing the match between allocated resources and actual usage to improve overall efficiency.
Data Source
AI summary
A communication method and apparatus, and a storage medium are provided. The method includes: determining a first downlink transmission parameter of a first terminal device based on a state of a downlink channel of the first terminal device, where the first downlink transmission parameter includes a first rank; determining, based on the first downlink transmission parameter, a first quantity of RBs occupied by downlink data of the first terminal device; determining a first quantity of remaining RBs based on a quantity of allocable RBs and the first quantity of RBs; and performing downlink data transmission with the first terminal device based on a second downlink transmission parameter if the first terminal device satisfies at least a first condition, where the second downlink transmission parameter includes a second rank.