Network Node Frequency Reconfiguration for Cyclic UE Collision Avoidance
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently managing resource allocations for User Equipment (UE) with cyclic traffic patterns, particularly in reducing latency while maintaining spectrum efficiency and reliability.
Innovation Solution
A method is proposed where a network node determines potential collisions in time-frequency resources among UEs with different cyclic transmission patterns and reconfigures the frequency allocation of one UE to overlap with another UE's frequency for non-collision time instances, without requiring RRC reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC reconfiguration is used to adjust frequency allocation for collision avoidance, then transmission reliability is improved, but latency increases due to reconfiguration delays
Solution Approach 1:
The network node performs preliminary analysis of cyclic transmission patterns and predicts potential frequency collisions before they occur. By pre-determining collision-free frequency allocations based on periodicity and time offset information, the system avoids the need for reactive RRC reconfiguration, thereby maintaining low latency while ensuring reliability.
Solution Approach 2:
The system incorporates feedback mechanisms where the network node monitors actual transmission patterns and adjusts frequency allocations dynamically. This feedback loop enables the system to learn from real-world conditions and optimize frequency assignments without requiring costly RRC reconfigurations, balancing reliability with latency requirements.
2Reliability
If frequency allocation is reconfigured to avoid collisions, then transmission reliability is improved, but spectrum efficiency decreases
Solution Approach 1:
The system dynamically adjusts frequency allocations based on predicted collision patterns while maintaining flexibility in resource usage. By enabling dynamic switching between frequency resources for different UEs based on their cyclic transmission characteristics, the system achieves both collision avoidance and optimal spectrum utilization without the rigidity of static allocations.
Solution Approach 2:
The network node modifies transmission parameters such as frequency selection, timing offsets, and periodicity adjustments to optimize the balance between collision avoidance and spectrum efficiency. By changing these parameters dynamically based on UE-specific patterns, the system achieves reliable transmissions while maintaining high spectrum efficiency.
3Loss of time
If dynamic frequency adjustment is implemented, then latency is reduced, but device complexity increases
Solution Approach 1:
The complex task of frequency allocation optimization is segmented into manageable components: analyzing cyclic patterns, predicting collisions, selecting alternative frequencies, and executing adjustments. By dividing the complex scheduling problem into these discrete functional blocks, the network node can implement low-latency frequency adjustment without overwhelming complexity in any single area.
Data Source
AI summary
Embodiments herein relate to a method, performed by a network node (110) in a wireless communication system (100), for handling resource allocations for a first User Equipment, UE (120a) out of a set of UEs (120). Each of the UEs (120) in the set of UEs 5(120) has a different pre-configured frequency allocation for cyclic transmissions, such as cyclic UL and/or DL transmissions. The network node (110) determines, based on a data arrival pattern, such as e.g. a packet arrival time, of the cyclic UL transmissions for each of the UEs in the set of UEs (120), one or more TTIs, where a collision between transmissions to and/or from two UEs (120) out of the set of UEs (120) may occur. The 10 network node (110) reconfigures the frequency allocation for a first UE (120a) of the two UEs (120) to overlap, at least partly, with the frequency of a second UE (120b) of the two UEs (120) for the TTIs other than the TTIs where the collision between the transmissions to and/or from the first and the second UEs (120a, 120b) may occur. Embodiments herein further relate to a method, performed by the first UE (120a) out of the set of UEs (120) in 15 the wireless communication system (100), for handling resource allocation for the first UE (120a) out of the set of UEs (120).