Uplink Collision Handling in 5G Shared Spectrum
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Solution Overview
Problem
Next generation communication systems face challenges in handling packet collisions, particularly in coexistence scenarios between different cellular communication systems using licensed shared bands, which can lead to interference and reduced performance.
Innovation Solution
The proposed method involves a base station (gNB/BS) transmitting an indication to user equipment (UE) to skip or drop uplink transmissions in case of collisions with URLLC packets, ensuring prioritization of URLLC services over eMBB services by adjusting scheduling and resource allocation dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If licensed shared bands are used for coexistence between different cellular communication systems, then spectrum utilization efficiency is improved, but packet collisions and interference occur between systems
Solution Approach 1:
The base station acts as an intermediary by transmitting indication information to user equipment about uplink packet collisions. This indication serves as a mediator that informs UEs about resource conflicts without requiring direct communication between different systems, enabling coordinated resource management while maintaining spectrum sharing efficiency
Solution Approach 2:
The base station transmits indication information about packet collisions in advance before the actual transmission occurs. This preliminary notification allows user equipment to proactively adjust their transmission strategies, skip conflicting transmissions, or buffer data, thereby preventing interference before it happens while maintaining efficient spectrum utilization
2Reliability
If URLLC packets are prioritized over eMBB packets to reduce latency, then URLLC reliability is improved, but eMBB service performance deteriorates
Solution Approach 1:
The system dynamically adjusts resource allocation based on service type and collision scenarios. The base station provides indication information that enables adaptive behavior: UEs can skip transmissions when URLLC priority is indicated, or transmit when eMBB resources are confirmed available. This dynamic adjustment ensures URLLC reliability while minimizing impact on eMBB performance through context-aware resource management
Solution Approach 2:
The indication information transmitted by the base station changes key parameters such as transmission timing, resource allocation, and priority levels. By dynamically modifying these parameters based on real-time network conditions and service requirements, the system achieves high URLLC reliability while maintaining efficient eMBB operations through parameter-based resource control
3Object-affected harmful factors
If user equipment skips uplink transmissions to avoid collisions, then packet collision mitigation is improved, but transmission efficiency and throughput decrease
Solution Approach 1:
The base station provides feedback in the form of indication information about uplink packet collision status to user equipment. This feedback mechanism enables UEs to make informed decisions about whether to skip or transmit, rather than blindly following fixed protocols. The feedback loop ensures collision mitigation while allowing transmissions to proceed when resources are confirmed available, thereby maintaining transmission efficiency
Solution Approach 2:
User equipment autonomously decides whether to skip or transmit based on the indication information received from the base station. Each UE independently evaluates its own transmission needs against the collision indication and makes self-service decisions about resource usage. This self-service approach enables precise collision avoidance at the individual UE level while maintaining overall system transmission efficiency through decentralized decision-making
Data Source
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AI summary
A communication method and a system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The method includes receiving, from a base station, scheduling information for a first uplink packet transmission in a first time slot, determining whether the first uplink packet transmission in the first time slot is restricted based on information corresponding to a second uplink packet transmission in the first time slot of another terminal, and if the first uplink packet transmission in the first time slot is restricted, skipping the first uplink packet transmission in a first time slot.