LTE Radio Resource Scheduling for Variable-Rate Real-Time Services
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Solution Overview
Problem
Current LTE systems lack efficient methods for dynamic resource allocation and scheduling to support variable data rates in real-time services like VoIP, leading to resource wastage due to fixed allocations that do not adapt to changing data rates.
Innovation Solution
Implementing a method for dynamic radio resource allocation and signaling that includes high-level configuration, UE-initiated data rate reporting, and pre-calculated tables for efficient allocation of resources based on varying data rates, using layer 1, 2, and 3 signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed resource allocation is used in LTE systems, then resource allocation simplicity is improved, but resource utilization efficiency deteriorates due to inability to adapt to variable data rates
Solution Approach 1:
The patent implements dynamic resource allocation where the eNB adjusts radio resource assignments based on reported data rates from UEs. The system transitions from static fixed allocation to dynamic allocation that adapts to varying service requirements, allowing resource blocks to be reassigned when data rates change, thereby improving resource utilization efficiency while maintaining operational simplicity through automated signaling procedures
Solution Approach 2:
The patent establishes a feedback mechanism where UEs monitor their data rates and report changes to the eNB. This feedback loop enables the eNB to make informed resource allocation decisions, adjusting assignments based on actual service requirements rather than fixed allocations, thus resolving the contradiction between allocation simplicity and utilization efficiency
2Productivity
If dynamic resource allocation is implemented, then resource utilization efficiency is improved, but system complexity increases due to additional signaling and coordination requirements
Solution Approach 1:
The patent enables UEs to autonomously monitor their own data rates and initiate reports when changes are detected. This self-service approach reduces the burden on the eNB, as UEs independently identify when resource reassignment is needed, thereby improving resource utilization without proportionally increasing overall system complexity
Solution Approach 2:
The patent manages complexity by focusing dynamic allocation on specific parameters (data rate thresholds, resource block assignments) rather than overhauling the entire system. The eNB and UE use predefined tables and signaling mechanisms for parameter adjustments, allowing dynamic resource allocation to be implemented with controlled complexity increases
3Adaptability or versatility
If frequent resource reassignment is performed, then adaptability to variable data rates is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial reassignment by allowing the eNB to update only the resource block assignments in response to data rate changes, rather than reassigning all resources. This selective approach maintains adaptability to variable data rates while reducing signaling overhead by transmitting only the necessary modification information
Solution Approach 2:
The patent reduces signaling overhead by having UEs monitor and detect data rate changes before reporting them to the eNB. This preliminary detection allows the system to prepare for efficient signaling, where only confirmed changes trigger reassignment messages, thereby maintaining adaptability while minimizing unnecessary signaling traffic
Data Source
AI summary
A method and apparatus are provided for dynamic resource allocation, scheduling and signaling for variable data real time services (RTS) in long term evolution (LTE) systems. Preferably, changes in data rate for uplink RTS traffic are reported to an evolved Node B (eNB) by a UE using layer 1, 2 or 3 signaling. The eNB dynamically allocates physical resources in response to a change in data rate by adding or removing radio blocks currently assigned to the data flow, and the eNB signals the new resource assignment to the UE. In an alternate embodiment, tables stored at the eNB and the UE describe mappings of RTS data rates to physical resources under certain channel conditions, such that the UE uses the table to locally assign physical resources according to changes in UL data rates. Additionally, a method and apparatus for high level configuration of RTS data flows is also presented.