NR Transmission Profiles for QoS-Aware Logical Channel Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current approaches for logical channel prioritization (LCP) in NR fail to provide sufficient information for multiplexing that fulfills Quality of Service (QoS) requirements, particularly in uplink and sidelink scenarios where the scheduler and MAC reside in different nodes.
Innovation Solution
Introduce transmission profiles that include priority levels, preemption indicators, and physical layer configurations to guide logical channel multiplexing, allowing higher priority transmissions to preempt lower priority ones, and associate logical channels with these profiles for optimized serving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current LCP approaches are used in uplink and sidelink, then the scheduler and MAC can operate with existing information, but the MAC layer cannot fulfill Quality of Service requirements for services with varying latency and bit rate demands
Solution Approach 1:
The patent applies preliminary action by pre-configuring transmission profiles that contain all necessary physical layer parameters (modulation schemes, resource blocks, power settings) and associating logical channels with these profiles before transmission. This allows the MAC layer to perform LCP with complete information about available resources and QoS requirements, resolving the information deficiency problem without requiring real-time negotiation.
Solution Approach 2:
The transmission profile acts as an intermediary structure that bridges the gap between physical layer capabilities and MAC layer LCP requirements. It consolidates physical layer parameters and QoS information into a unified configuration that the LCP function can use to make informed multiplexing decisions, thereby fulfilling QoS requirements while operating with distributed schedulers and MAC layers.
2Reliability
If transmission profiles with detailed physical layer parameters are introduced, then the MAC layer can perform optimized LCP for QoS fulfillment, but the system complexity increases due to additional configuration and management overhead
Solution Approach 1:
The transmission profile serves multiple functions simultaneously: it defines physical layer transmission parameters, establishes QoS requirements for associated logical channels, and provides the basis for LCP multiplexing decisions. This multi-functionality reduces the need for separate configuration mechanisms and simplifies overall system management despite the detailed information contained in each profile.
Solution Approach 2:
The patent manages complexity by allowing dynamic parameter changes within transmission profiles through RRC reconfiguration, enabling the system to adapt to varying service requirements without redesigning the entire LCP framework. The LCP function itself can be reconfigured with different parameter sets (prioritized data rates, priority values) to match current network conditions and service demands.
3Reliability
If pre-configured transmission profiles are used with prioritized data rates, then logical channel starvation is avoided as long as scheduled data rate meets the sum of prioritized data rates, but the system becomes less flexible when traffic patterns deviate from expectations
Solution Approach 1:
The system achieves dynamics through two mechanisms: (1) RRC reconfiguration allows transmission profiles and their associated prioritized data rates to be updated based on changing traffic patterns and service requirements; (2) The LCP function dynamically adjusts multiplexing decisions based on current buffer states, grant sizes, and profile priorities, enabling adaptation to actual traffic conditions while maintaining the structured framework of pre-configured profiles.
Data Source
AI summary
According to certain embodiments, a method by a wireless device is provided for performing logical channel prioritization (LCP) by a wireless device. The method includes selecting a set of logical channels based on one or more logical channel restrictions. The method further includes determining at least one logical channel of the set of logical channels to serve.