Relay UE Logical Channel Prioritization for Wireless Stability
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the existing methods for performing a Logical Channel Prioritization (LCP) procedure by a Relay UE do not adequately prevent the data or signaling of the relay UE from being deprioritized when multiplexed with data or signaling from a remote UE, leading to potential transmission delays and instability.
Innovation Solution
A new priority definition is introduced between the data or signaling of the relay UE and the remote UE during the LCP procedure, ensuring that relay UE traffic is prioritized over remote UE traffic to maintain stable transmission, which involves specific prioritization rules for different types of bearers and logical channels to prevent deprioritization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay UE data and remote UE data are multiplexed in the same DRB or SRB, then resource utilization is improved, but relay UE data or signaling may be deprioritized leading to transmission delays
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different types of data within the same bearer. Specifically, control plane data from the relay UE is assigned higher priority than user plane data, and data from the remote UE is assigned lower priority. This ensures that critical control signaling maintains reliable transmission while still allowing resource sharing for data traffic.
Solution Approach 2:
The patent changes the priority parameter assignment dynamically based on data type and source. By modifying the priority values assigned to different logical channels and bearers, the system ensures that relay UE control plane data always receives appropriate priority treatment, preventing deprioritization while maintaining efficient resource utilization for multiplexed traffic.
2Device complexity
If existing LCP procedures are used without new priority definitions, then device complexity is reduced, but transmission delays occur for relay UE data
Solution Approach 1:
The patent segments the data traffic into distinct categories with different priority treatments: control plane data from relay UE, user plane data from relay UE, and data from remote UE. Each segment is assigned specific priority values that ensure control plane data is transmitted without delay, while still maintaining a structured and manageable priority system that does not excessively increase device complexity.
3Reliability
If relay UE data is prioritized over remote UE data, then transmission stability is improved, but resource allocation for remote UE data may be reduced
Solution Approach 1:
The patent implements dynamic priority allocation where the priority of different data types can vary based on current transmission conditions and data importance. Control plane data from the relay UE maintains high priority to ensure stability, while user plane data and remote UE data receive adjusted priority levels that optimize overall resource utilization and prevent starvation of lower-priority traffic.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for performing a LCP procedure by a Relay UE in wireless communication system, the method comprising: performing, by the relay UE, a LCP procedure for generating MAC PDU by considering a priority of a first logical channel of a remote UE and a priority of a second logical channel of the relay UE; and transmitting the MAC PDU to a network, wherein if the priority of the second logical channel is equal to the priority of the first logical channel, data from the second logical channel of the relay UE is prioritized over data from the first logical channel of the remote UE during the LCP procedure.