Collision Avoidance in Semi-Persistent Radio Resource Allocation
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Solution Overview
Problem
Collisions occur between dynamic and predefined resource allocations in radio access networks, such as E-UTRAN, leading to inefficiencies and potential communication failures due to high network loads and signaling errors.
Innovation Solution
A method and apparatus that determine collision risks between retransmissions and other transmissions, ignoring or acknowledging retransmission requests to avoid collisions, and prioritizing first transmissions over retransmissions in high-load conditions, utilizing enhanced Node B functionality to manage resource allocations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic allocation and predefined allocation are both used in radio access networks, then resource allocation flexibility and service support are improved, but collision risk between transmissions increases
Solution Approach 1:
The patent applies preliminary action by checking for potential collisions between dynamic and predefined allocations before finalizing resource assignments. The base station performs collision detection in advance by comparing the dynamic allocation to be granted with existing predefined allocations, and adjusts or rejects the dynamic allocation if a collision is detected, thereby preventing transmission conflicts before they occur.
2Reliability
If retransmission is always performed when transmission fails, then communication reliability is improved, but network load and collision probability increase
Solution Approach 1:
The patent applies feedback by implementing a collision detection mechanism where the base station monitors the network state and feedback from previous transmissions. When a collision is detected or predicted, the system adjusts retransmission decisions based on this feedback, selectively permitting or blocking retransmissions to avoid further collisions while maintaining necessary communication reliability.
Solution Approach 2:
The patent applies partial action by implementing selective retransmission control rather than always performing retransmission. The system performs retransmission only when it is safe to do so (when no collision is detected), and blocks retransmission when collision risk is present, thereby reducing unnecessary network load while maintaining adequate communication reliability.
3Loss of information
If predefined resources are allocated for first HARQ transmissions, then signaling overhead is reduced, but collision risk with retransmission resources increases
Solution Approach 1:
The patent applies preliminary action by performing collision detection between predefined allocations and dynamic allocations before granting resources. The base station checks whether the dynamic allocation (which may be used for retransmissions) collides with predefined allocations, and takes preventive action by adjusting the dynamic allocation or blocking retransmission if a collision is detected, thereby maintaining the signaling overhead benefits while reducing collision risk.
Data Source
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AI summary
A method, comprising: receiving a request for retransmission from user equipment for a predetermined transmission time interval in a communication network; determining whether a collision risk exists between the retransmission and another transmission during the predetermined time interval; and ignoring the retransmission request when the determined collision risk exists.