Grant-Free Resource Sub-Pool Assignment for Collision Detection
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in detecting collisions between user devices' transmissions, especially for ultra-reliable and low-latency communications (URLLC), as existing methods introduce significant latency and make it difficult for base stations to identify which device experienced a collision during grant-free transmissions.
Innovation Solution
A hierarchical resource pool configuration is implemented, where each user device is assigned to a unique scheduling request sub-pool and data sub-pool, ensuring that no two devices share the same sub-pools, allowing the base station to identify collisions and enable grant-free mode transmissions of both data and scheduling requests simultaneously via different resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If grant-free mode transmission is used to reduce latency, then transmission speed is improved, but collision detection capability deteriorates
Solution Approach 1:
The resource pool is segmented into multiple sub-pools (first sub-pool, second sub-pool, third sub-pool, fourth sub-pool) with different collision detection capabilities. Sub-pools 1-3 use random selection with limited collision detection, while sub-pool 4 uses deterministic selection with full collision detection capability, allowing the system to balance speed and detection needs across different transmission scenarios
Solution Approach 2:
The system changes the collision detection parameter by assigning different detection capabilities to different sub-pools. Devices can select sub-pools based on their collision detection requirements, effectively changing the system parameter from a fixed state to a variable state that adapts to different transmission needs
2Measurement precision
If resource pool is divided into sub-pools for collision identification, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The resource pool is divided into four distinct sub-pools with different collision detection capabilities (sub-pools 1-3 with limited detection, sub-pool 4 with full detection). This segmentation allows precise collision identification in sub-pool 4 while keeping other sub-pools simpler, thereby improving measurement precision without uniformly increasing complexity across all resources
Solution Approach 2:
Different sub-pools have different local qualities regarding collision detection capability. Sub-pool 4 is designed with deterministic resource selection and full collision detection capability, while sub-pools 1-3 use random selection with limited detection. This local quality differentiation improves overall measurement precision while distributing complexity only where necessary
3Reliability
If deterministic resource selection is used for collision-free transmission, then reliability is improved, but adaptability deteriorates
Solution Approach 1:
The system implements dynamic resource selection where devices can choose between deterministic selection (for high reliability in sub-pool 4) and random selection (for adaptability in sub-pools 1-3). This dynamic approach allows the system to adapt to different transmission scenarios while maintaining high reliability options when needed
Solution Approach 2:
The resource pool configuration serves multiple functions: sub-pools 1-3 provide adaptable random access for general traffic, while sub-pool 4 provides deterministic collision-free transmission for reliable traffic. This multi-functionality allows the same overall system to serve both adaptability and reliability needs simultaneously
Data Source
AI summary
A technique includes receiving, by a first user device from a base station, control information indicating an assignment of the first user device to a first scheduling request sub-pool of resources of one or more scheduling request sub-pools, and an assignment of the first user device to a first data sub-pool of resources of one or more data sub-pools, wherein the sub-pools assigned to the first user device allow a contention-based grant-free mode transmission from the first user device of both a data and a scheduling request at the same time via different resources, wherein for at least a plurality of user devices no two user devices are assigned to both a same data sub-pool and a same scheduling request sub-pool.