Dynamic Radio Resource Arbitration for NR/LTE Spectrum Sharing
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Solution Overview
Problem
In LTE/NR spectrum sharing, MBSFN subframes can result in wasted Resource Blocks (RBs) if NR downlink traffic is insufficient, leading to increased delay and limited throughput for NR, while non-MBSFN subframes may be underutilized when LTE demand is low.
Innovation Solution
Intelligently determine and delay NR non-delay-sensitive traffic based on factors like RB demand, availability, and time until next MBSFN subframe to optimize spectral efficiency and minimize delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MBSFN subframes are configured for LTE/NR spectrum sharing, then NR spectral efficiency is improved by eliminating LTE CRS overhead, but NR downlink throughput is limited when NR traffic demand is insufficient
Solution Approach 1:
The patent implements dynamic resource arbitration that adapts resource allocation between LTE and NR based on real-time traffic conditions. The system dynamically switches between configuring MBSFN subframes (when NR demand is high) and non-MBSFN subframes (when NR demand is low), allowing the network to optimize for either spectral efficiency or throughput depending on current conditions
Solution Approach 2:
The patent changes the MBSFN subframe configuration parameter based on NR traffic demand. When NR traffic demand exceeds a threshold, the system configures MBSFN subframes to improve spectral efficiency. When demand is below the threshold, it configures non-MBSFN subframes to maximize throughput, thus using parameter changes to resolve the contradiction
2Productivity
If non-MBSFN subframes are configured when LTE demand is low, then NR can utilize more resources, but RB waste occurs when NR downlink traffic is insufficient
Solution Approach 1:
The patent employs a feedback mechanism where the system monitors NR traffic demand and uses this information to determine MBSFN subframe configuration. The resource arbitration decision is based on feedback about current NR traffic conditions, allowing the system to avoid configuring non-MBSFN subframes when NR traffic is insufficient, thereby preventing RB waste while maximizing resource utilization when needed
3Loss of time
If MBSFN subframes are used to improve NR spectral efficiency, then NR delay is reduced for downlink traffic, but LTE performance may be impacted
Solution Approach 1:
The patent uses dynamic resource arbitration that adjusts MBSFN subframe configuration based on both NR and LTE traffic conditions. The system dynamically balances the trade-off between reducing NR delay (by configuring MBSFN subframes) and maintaining LTE performance, switching configurations based on real-time demand assessment rather than using a fixed configuration
Data Source
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AI summary
Systems and methods are disclosed for radio resource arbitration for spectrum sharing between different Radio Access Technologies (RATs). In one embodiment, a method performed by a network node for radio resource arbitration for spectrum sharing between a first RAT and a second RAT comprises, for a non-Multicast Broadcast Single Frequency Network (MBSFN) subframe, determining whether non-latency-sensitive traffic for the first RAT can be delayed to one or more next MBSFN subframes and, upon determining that non-latency-sensitive traffic for the first RAT can be delayed, determining an amount of non-latency-sensitive traffic for the first RAT to be delayed until the one or more next MBSFN subframes. By leveraging the results of this determining, improved spectral efficiency and throughput can be achieved.