Adaptive Resource Partitioning in Heterogeneous Wireless Networks
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Solution Overview
Problem
Wireless communication networks face interference issues due to the increasing demand for mobile broadband access, leading to congested networks and degraded performance, especially in heterogeneous environments where UEs experience high interference from multiple eNodeBs with different power levels and coverage areas.
Innovation Solution
The method involves dynamically changing subframe interlaces to prohibited subframes, preventing new data transmissions and allowing retransmissions, and relying on upper layer techniques for error recovery, to mitigate interference and improve network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic resource allocation is implemented to meet growing mobile broadband demand, then network capacity and access flexibility improve, but interference between eNodeBs increases and network performance degrades
Solution Approach 1:
The patent segments the wireless resource space by dividing subframes into different interlaces (even and odd indexed subframes) that can be independently allocated to different eNodeBs. This segmentation allows macro eNodeBs and small cell eNodeBs to operate on separate time resources, reducing interference while maintaining overall network capacity and enabling flexible dynamic resource allocation.
2Object-affected harmful factors
If subframe interlaces are dynamically changed to prohibited subframes to reduce interference, then interference levels decrease, but data transmission efficiency and network productivity are reduced
Solution Approach 1:
The patent implements dynamic resource allocation where subframe interlaces can be flexibly changed between protected and prohibited states based on real-time network conditions and traffic demands. This dynamic approach allows the system to optimize the balance between interference reduction and data transmission efficiency, rather than using fixed resource partitioning.
Solution Approach 2:
The patent changes the temporal parameters of resource allocation by dynamically modifying which subframe interlaces are protected or prohibited. This parameter change allows the network to adapt resource distribution over time, reducing interference when needed while maintaining high data transmission efficiency during periods of lower interference.
3Reliability
If new data transmission is prevented on prohibited subframe interlaces during ARPI transition, then transmission reliability improves, but network latency and data delivery time increase
Solution Approach 1:
The patent applies preliminary action by notifying UEs in advance about upcoming ARPI transitions and prohibited subframe interlaces. This allows UEs to prepare for the transition by buffering or retransmitting data before the prohibited subframes begin, ensuring transmission reliability while minimizing the time loss associated with the transition.
Data Source
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AI summary
One aspect discloses transition behavior of dynamically changing subframe interlaces and the corresponding behavior of the bases stations during the changing. A method of wireless communication includes receiving (1010,1020) a request to dynamically change a subframe interlace. The subframe interlace is transitioned and during the transition new data transmission is prevented on the prohibited subframe interlace and retransmissions are allowed on the prohibited subframe interlace (1012). Alternatively, during the transition pending retransmissions on the prohibited subframe interface are prevented (1022) and all pending retransmissions waiting to be scheduled on the subframe interface are stopped and corresponding packets are discarded (1024).