Uplink Grant Prioritization in Wireless LCP Procedures
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Solution Overview
Problem
In wireless communication systems, particularly in NR, User Equipment (UE) performs Logical Channel Prioritization (LCP) only for relevant logical channels, leading to potential waste of uplink grants when multiple grants are received simultaneously, as the processing order of grants is left to UE implementation, resulting in inefficient use of resources.
Innovation Solution
The UE generates MAC PDUs by prioritizing UL grants based on the ascending order of the number of logical channels associated with each numerology set, ensuring efficient use of received uplink grants by processing those with fewer logical channels first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE performs LCP procedure only for relevant logical channels, then the processing complexity is reduced, but the uplink grant waste increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing a mapping relationship between logical channels and numerology sets before the LCP procedure. When multiple UL grants are received, the UE can immediately identify which grants are relevant to which logical channels based on this pre-established mapping, avoiding the need to re-evaluate all grants against all logical channels during processing. This reduces processing complexity while ensuring no relevant grant is missed.
2Adaptability or versatility
If the processing order of multiple UL grants is left to UE implementation, then the implementation flexibility is increased, but the resource allocation efficiency decreases
Solution Approach 1:
The patent changes the parameter of grant selection by introducing a specific criterion: selecting UL grants based on the number of associated logical channels. The UE prioritizes processing grants with fewer associated logical channels first, then proceeds to grants with more associations. This parameter-based approach provides a deterministic yet flexible ordering mechanism that improves resource allocation efficiency while allowing UEs with different capabilities to implement the logic in their own optimal ways.
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 in wireless communication system, the method comprising: receiving multiple uplink (UL) grants, in a state that the UE is configured to one or more logical channels, each of the one or more logical channels being associated with a respective numerology set; wherein each of the multiple UL grants includes information for an associated numerology set; and performing a logical channel prioritization (LCP) procedure using the multiple UL grants in ascending order of a number of logical channels associated with a numerology set for each UL grant. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.