Quick Uplink Channel Scheduling for Reduced Slot-Based TTI Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly LTE, face challenges in improving mobile broadband access and reducing latency in uplink channels, as they rely on legacy transmission time intervals (TTIs) that do not efficiently support the increasing demand for low-latency and high-reliability services.
Innovation Solution
Implementing slot-based transmission time intervals (TTIs) for uplink channels, including Quick Physical Uplink Control Channels (QPUCCH), Quick Enhanced Physical Uplink Control Channels (QEPUCCH), and Quick Physical Uplink Shared Channels (QPUSCH), which allow for reduced latency and increased communication rates by using a TTI of 0.5 ms, alongside legacy channel scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If legacy transmission time intervals (TTIs) are used in LTE uplink channels, then system stability and compatibility are maintained, but latency is increased and communication rates are limited
Solution Approach 1:
The patent segments the uplink channel into two distinct types: legacy PUCCH/PUSCH channels with 1ms TTI and quick PUCCH/QPUSCH channels with 0.5ms TTI. This segmentation allows the system to simultaneously support both traditional reliability requirements and low-latency requirements by providing separate channel paths with different transmission time characteristics, thereby reducing overall system latency without forcing a complete overhaul of the legacy channel structure.
Solution Approach 2:
The patent implements dynamic channel selection where the UE can adaptively choose between legacy and quick channels based on service requirements, channel conditions, and scheduling decisions. This dynamic approach allows the system to optimize latency performance for time-critical services while maintaining stability for traditional services, effectively managing the complexity through flexible, condition-based channel assignment rather than static configuration.
2Productivity
If slot-based transmission time intervals (TTIs) of 0.5 ms are implemented for quick channels, then latency is reduced and communication rates are enhanced, but system complexity increases due to coexistence with legacy channels
Solution Approach 1:
The patent applies local quality by assigning different TTI durations to different channel types and service requirements. Quick channels use 0.5ms TTI for high-speed, low-latency applications, while legacy channels maintain 1ms TTI for traditional services. This localized differentiation allows high communication rates for specific applications without requiring the entire system to operate at higher speeds, thereby managing complexity through targeted optimization rather than system-wide changes.
Solution Approach 2:
The patent creates a universal uplink framework that can handle both legacy and quick channels within the same system. The eNodeB and UE are designed to support multiple channel types with different TTIs, allowing a single system infrastructure to serve diverse service requirements from traditional mobile broadband to ultra-reliable low-latency communications, thus achieving multi-functionality without proportionally increasing complexity.
3Adaptability or versatility
If multiple channel types with different TTI durations are transmitted within the same subframe, then service diversity and quality of service are improved, but resource management complexity increases
Solution Approach 1:
The patent introduces a new dimension of resource allocation by adding TTI duration as a differentiating parameter alongside traditional time-frequency resources. Instead of only allocating resources in the time-frequency plane, the system now allocates across an additional dimension of TTI length (0.5ms vs 1ms), allowing services to be differentiated and managed in multiple dimensions simultaneously. This multi-dimensional resource management enables diverse service support while providing structured methods to handle the increased complexity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques that may be used to help enable low latency communications between a user equipment (UE) and a base station (BS) using quick uplink channels that enable a reduced transmission time interval (TTI). An example method generally includes identifying a plurality of slots in a subframe, receiving a resource configuration for an uplink channel, wherein the resource configuration is associated with a first slot of the plurality of slots, determining a resource for transmitting the uplink channel in a second slot of the plurality of slots, wherein the resource is determined based on the resource configuration associated with the first slot of the plurality of slots, and transmitting the uplink channel in the second slot using the determined resource.