Wireless Resource Block Mapping via Permutation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless networks, the limited spectral resources are not efficiently utilized due to the fixed allocation of resource blocks, which can lead to suboptimal frequency reuse and increased interference between cells.
Innovation Solution
A method and apparatus for mapping resource blocks into subchannels using a permutation formula that assigns subcarriers based on permutation parameters including a random or pseudorandom variable, allowing for dynamic allocation and improved frequency diversity, thereby optimizing spectral resource usage and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource blocks are allocated using a fixed allocation method, then the allocation process is simple and deterministic, but spectral efficiency is reduced and frequency diversity is limited
Solution Approach 1:
The patent transforms the static, fixed resource block allocation into a dynamic system using permutation formulas with parameters that can change over time. The permutation index varies across different resource blocks, OFDM symbols, and subcarriers, enabling the allocation pattern to adapt and change dynamically while maintaining mathematical structure and predictability through the formula-based approach.
Solution Approach 2:
The patent introduces multiple可变 parameters into the allocation system including permutation index, resource block index, OFDM symbol index, and subcarrier index. These parameters allow the allocation pattern to be adjusted and optimized for different channel conditions, traffic loads, and interference scenarios, thereby improving spectral efficiency without requiring complete redesign of the allocation mechanism.
2Object-affected harmful factors
If resource blocks are fixedly allocated, then interference between cells remains high due to suboptimal frequency reuse, but changing allocation patterns increases system complexity
Solution Approach 1:
The patent divides the frequency spectrum into multiple resource blocks and further segments them into subchannels using permutation-based mapping. This segmentation allows different cells to use different permutation patterns, enabling frequency reuse across cells while minimizing interference. Each cell can be assigned specific permutation indices, creating a structured approach to interference management.
Solution Approach 2:
The patent employs dynamic permutation patterns that can be adjusted to optimize frequency reuse across different cells. By varying the permutation index and parameters, the system can create time-varying allocation patterns that reduce persistent interference between cells while maintaining manageable complexity through the use of standardized formulas.
3Reliability
If a permutation formula with random or pseudorandom variables is used for mapping, then frequency diversity is improved and spectral efficiency is enhanced, but the system requires more complex processing and coordination
Solution Approach 1:
The patent uses permutation formulas that generate deterministic or pseudorandom patterns based on shared parameters between transmitter and receiver. Both the base station and mobile station can independently generate the same permutation patterns using the same formulas and parameters, eliminating the need for explicit signaling of the actual mapping patterns. This copying approach reduces processing complexity while maintaining the frequency diversity benefits.
Solution Approach 2:
The patent introduces controllable parameters into the permutation formulas that can be adjusted to balance between frequency diversity and processing complexity. By carefully selecting parameter values and ranges, the system can achieve adequate frequency diversity while keeping the computational burden manageable for both transmission and reception operations.
Data Source
AI summary
According to an example embodiment, a method may include determining, by a first wireless node in a wireless network, a number N of resource blocks available for transmitting data within a cell, the N resource blocks each including V resource block orthogonal frequency division multiplexing (OFDM) symbols, the V resource block OFDM symbols each including U resource block subcarriers. The method may also include mapping the N resource blocks into N subchannels based on a permutation formula, the permutation formula assigning, based on permutation parameters including the number N and a random or pseudorandom variable, U subchannel subcarriers for each of V subchannel OFDM symbols to each of the N subchannels and thereby allocating a subchannel index for each of the N subchannels. The method may also include sending a message to a second wireless node indicating the permutation parameters and the allocated subchannel index of at least one of the N subchannels for communication between the first wireless node and the second wireless node.