Configurable Bandwidth Resource Grants for Low Latency LTE
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly those based on legacy LTE, face challenges in achieving lower latency due to fixed transmission time intervals (TTIs), which limits bandwidth efficiency and user equipment (UE) performance as demand for mobile broadband increases.
Innovation Solution
The implementation of ultra-low latency (ULL) communication technology that utilizes shorter, more frequent TTIs, allowing for configurable bandwidth in uplink shared data channels through resource grants indicating start and end indicators, enabling efficient resource allocation in frequency and time domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fixed transmission time intervals (TTIs) are used in legacy LTE, then system stability and simplicity are maintained, but latency cannot be reduced and bandwidth efficiency is limited
Solution Approach 1:
The patent applies dynamics by making the TTI duration configurable and adaptable rather than fixed. The system can dynamically adjust TTI length based on traffic conditions and service requirements, enabling shorter TTIs for low-latency applications while maintaining longer TTIs for other scenarios. This is achieved through configurable parameters in the resource grant that allow flexible TTI duration selection.
Solution Approach 2:
The patent changes key parameters including TTI duration, bandwidth allocation, and start indicators to enable flexible resource allocation. By modifying these parameters dynamically based on channel conditions and traffic demands, the system achieves lower latency without requiring complete system redesign, thus managing complexity while improving performance.
2Speed
If shorter transmission time intervals are implemented to reduce latency, then communication speed improves, but resource allocation complexity increases
Solution Approach 1:
The patent segments the resource allocation into manageable components by introducing start indicators and configurable bandwidth parameters within the resource grant. This segmentation allows the system to handle shorter TTIs by breaking down the allocation process into discrete, controllable elements rather than requiring complex monolithic scheduling.
Solution Approach 2:
The patent employs preliminary action by pre-configuring resource allocation parameters including start indicators and bandwidth settings in advance through the resource grant. This preparation enables faster execution of short TTI transmissions without requiring complex real-time decisions, thus improving communication speed while managing allocation complexity.
3Productivity
If configurable bandwidth is used in uplink shared data channels, then bandwidth utilization efficiency improves, but control signaling overhead increases
Solution Approach 1:
The patent makes the resource grant multi-functional by embedding multiple pieces of information including bandwidth configuration, start indicators, and duration parameters within a single signaling structure. This universal approach allows the same control message to simultaneously define multiple aspects of resource allocation, improving bandwidth utilization while minimizing the increase in signaling overhead.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Various aspects described herein relate to communicating using a configurable bandwidth. A user equipment (UE) can receive a control channel from a serving evolved Node B (eNB), where the control channel includes a resource grant for an uplink shared data channel including a number of resource block groups starting from a starting resource block group in an allocation space, and where the allocation space includes a plurality of resource block groups in a frequency domain over a plurality of symbols in a time domain. The UE can transmit data in the uplink shared data channel starting from the starting resource block group in the allocation space and continuing through the number of resource block groups in the allocation space over the frequency domain first and over the time domain second.