Contention-Based Uplink Access for Low-Latency UE Transmission
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in uplink scheduling latency, particularly for delay-sensitive traffic, due to the inefficiencies associated with persistent dedicated resource reservation and multi-step scheduling procedures in conventional grant-based uplink scheduling.
Innovation Solution
Implementing contention-based uplink access, where UEs autonomously initiate uplink data transmission without explicit network allocation, using predefined selection rules for preambles and uplink transmission parameters, and transmitting a preamble along with data on a contention-based physical uplink shared channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grant-based uplink scheduling is used, then reliable uplink transmission is ensured, but uplink scheduling latency increases
Solution Approach 1:
The network pre-configures multiple uplink resource sets with associated transmission parameters before the UE needs to transmit. When uplink data arrives, the UE can immediately select from pre-configured resources without waiting for dynamic scheduling, thereby reducing latency while maintaining reliability through pre-planned resource allocation
Solution Approach 2:
The UE autonomously selects uplink resources from the pre-configured sets based on local conditions (such as traffic characteristics and channel state) without requiring network intervention for each transmission decision. This self-service mechanism eliminates scheduling delay while the network maintains overall control through feedback channels
2Productivity
If persistent dedicated resource reservation is used, then uplink resource availability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The system provides multiple uplink resource sets with different characteristics (e.g., different time frequencies, different transmission parameters). The UE dynamically selects the most appropriate resource set based on current traffic conditions and channel state, allowing the system to adapt between dedicated resource guarantees and efficient resource sharing rather than using fixed persistent reservation
Solution Approach 2:
Different uplink resource sets are configured with varying parameters such as time slot allocations, frequency resources, modulation schemes, and coding rates. The UE changes these parameters based on traffic requirements, enabling high resource availability for delay-sensitive traffic while improving overall utilization efficiency by matching resource characteristics to actual needs
Data Source
AI summary
Various aspects of the present disclosure relate to receiving a resource allocation comprising a plurality of sets of uplink resources for contention-based uplink transmission; and performing a contention-based uplink transmission on one of the plurality of sets of uplink resources based at least in part on a condition for the contention-based uplink transmission being satisfied, where the contention-based uplink transmission comprises a first uplink signal and a second uplink signal transmitted in a same time resource.