Uplink Resource Scheduling for URLLC Low Latency
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Solution Overview
Problem
Current 5G mobile communication systems struggle to meet the high reliable and low latency transmission requirements of Ultra-reliable and Low Latency Communication (URLLC) services due to the restriction of uplink radio resources being configured in order.
Innovation Solution
The proposed solution involves an uplink transmission mechanism that allows the base station (BS) to configure uplink resources out of order, enabling the user equipment (UE) to decide on uplink signal transmission based on the relative position relationship of radio resources in the time domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BS configures uplink radio resources in order, then the system maintains simple resource allocation, but the URLLC service cannot meet low latency and high reliability requirements
Solution Approach 1:
The patent implements dynamic resource configuration where the BS can adjust uplink resource allocation order based on service requirements. For URLLC services, the BS configures resources with earlier transmission timing even if received later, creating a dynamic scheduling mechanism that adapts to different service types (eMBB vs URLLC) while maintaining systematic control
Solution Approach 2:
The patent changes the timing parameter relationship between resource reception and transmission. Specifically, it allows the transmission timing of uplink resources to be decoupled from the reception timing of corresponding DCIs, enabling URLLC resources to be scheduled with earlier transmission times than eMBB resources, thus meeting low latency requirements without increasing fundamental system complexity
2Loss of time
If the BS allows instantaneous transmission for urgency, then the low latency requirement is met, but the resource configuration becomes complex and undefined in prior art
Solution Approach 1:
The patent applies preliminary action by having the BS pre-configure multiple types of uplink resources including both eMBB and URLLC resources in advance, with each resource type having predetermined timing relationships. This allows the UE to immediately use pre-configured URLLC resources when urgent transmission is needed without requiring complex real-time configuration decisions
Solution Approach 2:
The patent segments uplink resources into different types (eMBB resources and URLLC resources) with distinct timing characteristics. This segmentation allows independent optimization of each resource type, where URLLC resources can be configured with earlier transmission timing independent of eMBB resources, reducing the complexity of managing instantaneous transmission requirements
3Adaptability or versatility
If the UE processes multiple downlink data signals with different timing, then the system supports flexible scheduling, but the UE processing complexity increases
Solution Approach 1:
The patent applies local quality by having the UE apply different processing rules to different downlink data signals based on their source DCI timing relationships. Specifically, the UE determines whether to continue processing or discard ongoing uplink signals based on local timing criteria (whether the new DCI was received before the original uplink transmission deadline), rather than applying a uniform complex scheduling algorithm to all signals
Data Source
AI summary
A user equipment (UE) for a mobile communication system is provided. The UE receives, from the BS, a first downlink control information (DCI) indicating a first uplink resource for transmitting a first uplink signal, and then receives, from the BS, a second DCI indicating a second uplink resource for transmitting a second uplink signal. The BS configures the second uplink resource to be advanced to the first uplink resource in the time domain based on the uplink out-of-order configuration. The UE decides the transmission of the first uplink signal according to the condition of resource configuration.