Dynamic HARQ Process Allocation for Uplink Interference Control
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Solution Overview
Problem
Current wireless communication systems face sub-optimal performance due to the inability to dynamically adjust HARQ processes in real-time, especially when dealing with delay-sensitive applications like VoIP, leading to inconsistent interference and reduced capacity.
Innovation Solution
A method and apparatus for dynamically allocating HARQ processes by signaling activation or deactivation states to WTRUs, allowing for immediate adjustments based on activity changes, thereby maintaining consistent interference across all processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If non-scheduled transmissions are used with fixed HARQ process allocation, then signaling overhead is reduced, but interference consistency across TTIs deteriorates
Solution Approach 1:
The patent implements dynamic HARQ process allocation where the network can activate or deactivate specific HARQ processes for each WTRU based on real-time interference conditions and traffic patterns. This dynamic adjustment allows the system to maintain interference consistency across TTIs while still using non-scheduled transmissions, resolving the contradiction between reduced signaling overhead and interference stability.
2Stability of the object's composition
If WTRU-specific subset of HARQ processes is restricted, then interference is equalized across TTIs, but system capacity is reduced
Solution Approach 1:
The patent enables dynamic adjustment of HARQ process subsets for each WTRU based on real-time system conditions. During periods of low interference, more HARQ processes can be activated to increase capacity, while during high interference periods, the subset is restricted to maintain equalization. This dynamic approach resolves the contradiction by adapting the restriction level to current system state.
Solution Approach 2:
The network dynamically changes the parameter of HARQ process allocation (which specific processes are activated for each WTRU) based on interference measurements and traffic patterns. This parameter adjustment allows the system to optimize between interference equalization and capacity utilization depending on current conditions.
3Productivity
If HARQ processes are dynamically adjusted for delay-sensitive applications, then capacity is maximized, but interference consistency deteriorates
Solution Approach 1:
The patent applies different HARQ process allocation strategies to different WTRUs and different HARQ processes based on their specific needs. Delay-sensitive applications receive priority allocation of specific HARQ processes with faster activation, while other traffic patterns are managed to maintain overall interference consistency. This localized differentiation resolves the contradiction by allowing capacity optimization for specific applications without compromising overall system stability.
Data Source
AI summary
In a wireless communication system including at least one wireless transmit/receive unit (WTRU) and at least one Node-B (NB), an activation or deactivation state is determined for each of a plurality of HARQ processes. A signal that includes the activation or deactivation state for each of the HARQ processes is transmitted to the WTRU. In response to receiving the signal, the WTRU activates or deactivates a particular HARQ process in accordance with the activation or deactivation state for each of the HARQ processes contained in the received signal.