Uplink Data Prioritization Over Scheduling Requests in Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, existing methods struggle to effectively prioritize uplink data and scheduling requests, leading to potential interference and delays in overlapping transmission scenarios, particularly in scenarios involving Temporary Cell Radio Network Temporary Identifiers (C-RNTI) and logical channel-based prioritization.
Innovation Solution
A method where User Equipment (UE) determines prioritization between overlapping uplink grants and scheduling requests based on logical channel priorities, with specific rules for handling Temporary C-RNTI and C-RNTI addressed grants, ensuring that higher priority logical channels are served first, thereby optimizing resource allocation and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits both uplink data and scheduling request simultaneously in overlapping time resources, then the transmission capacity is maximized, but interference occurs and transmission reliability deteriorates
Solution Approach 1:
The UE performs preliminary determination of transmission priority before actual transmission by evaluating RNTI types and logical channel priorities. This advance decision-making prevents interference by ensuring only one transmission type (uplink data or scheduling request) is selected for overlapping resources, thereby maintaining transmission reliability while managing capacity efficiently
Solution Approach 2:
Instead of allowing simultaneous transmission and resolving interference through complex coordination, the patent inverts the approach by selectively suppressing one transmission type based on priority rules. The UE prioritizes either uplink data or scheduling request transmission by comparing RNTI types and logical channel priorities, thereby eliminating interference while preserving essential communication functions
2Speed
If the UE prioritizes scheduling request over uplink data in overlapping scenarios, then scheduling responsiveness is improved, but data transmission delay increases
Solution Approach 1:
The patent applies different prioritization rules based on local conditions - specifically the type of RNTI (Temporary C-RNTI versus C-RNTI) and the logical channel priority of the uplink data. This localized quality assessment ensures that scheduling requests are prioritized only when appropriate (e.g., for Temporary C-RNTI), while high-priority data transmissions are protected from delay, thus balancing responsiveness and transmission timing
Solution Approach 2:
The UE dynamically changes the transmission priority parameter based on the evaluated conditions. When Temporary C-RNTI is detected, the scheduling request priority is increased; when C-RNTI is detected with high-priority logical channel data, the uplink data priority is maintained. This parameter adaptation resolves the contradiction by adjusting priorities contextually rather than using fixed rules
3Device complexity
If the UE uses simple prioritization rules for overlapping transmissions, then device complexity is reduced, but prioritization accuracy deteriorates
Solution Approach 1:
The patent segments the prioritization decision into distinct evaluation stages: first checking RNTI type (Temporary C-RNTI versus C-RNTI), then evaluating logical channel priority if needed. This segmentation transforms a complex single-step decision into manageable sequential steps, reducing implementation complexity while maintaining accurate prioritization through systematic evaluation of multiple criteria
Data Source
AI summary
A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE) configured with logical channel based prioritization, the UE determines prioritization between a first uplink (UL) grant and a first scheduling request based on a first logical channel associated with triggering the first scheduling request, wherein the first UL grant and the first scheduling request overlap in time domain. The UE receives a second UL grant, wherein the second UL grant and a second scheduling request overlap in time domain. The UE prioritizes the second UL grant over the second scheduling request based on the second UL grant being addressed to a Temporary Cell Radio Network Temporary Identifier (C-RNTI) of the UE.