Scheduling Request Resource Mapping for Uplink Allocation
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in efficiently managing scheduling requests due to limited knowledge of buffer status and power headroom at the eNodeB, leading to suboptimal resource allocation and potential delays in data transmission.
Innovation Solution
The eNB configures SR resources on multiple cells and maps each SR resource to at least one logical channel, allowing the UE to select the appropriate SR resource based on the logical channel triggering a Buffer Status Report (BSR) and Scheduling Request (SR), thereby enabling more precise uplink resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the eNodeB uses traditional scheduling request resources, then the device complexity is reduced, but the uplink resource allocation precision deteriorates due to limited knowledge of buffer status and power headroom
Solution Approach 1:
The patent segments the scheduling request resources by associating them with specific logical channels. Each logical channel is mapped to dedicated SR resources, allowing the eNodeB to identify which logical channel has data to transmit based on which SR resource is used. This segmentation provides precise buffer status information without requiring complex additional signaling.
Solution Approach 2:
The patent introduces SR resource association as an intermediary mechanism between the UE and eNodeB. By mapping SR resources to logical channels through configuration parameters, the system enables the eNodeB to infer buffer status information indirectly through the selected SR resource, improving measurement precision without direct buffer status reporting.
2Productivity
If the eNodeB configures SR resources on multiple cells, then the uplink resource allocation efficiency improves, but the device complexity increases due to multiple cell configurations
Solution Approach 1:
The patent implements a universal SR resource configuration mechanism that can be applied across multiple cells. The same logical channel to SR resource mapping principles are used regardless of which cell is involved, allowing the system to efficiently allocate uplink resources across multiple cells while maintaining consistent configuration management through standardized parameters.
3Reliability
If the eNodeB uses centralized scheduling, then the system performance is optimized, but the information accuracy about buffer status deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the UE selects SR resources based on its buffer status and logical channel conditions. This selection acts as feedback to the eNodeB, providing accurate information about which logical channel has data to transmit and the urgency of the transmission, enabling optimized scheduling decisions with accurate information.
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 transmitting a scheduling request in a wireless communication system, the method comprising: receiving mapping information of SR resource sets and logical channels from an eNB, wherein one of the SR resource sets is a set of uplink resources that is used for transmitting SR; triggering a SR by a data of a logical channel; and transmitting the triggered SR on the SR resource set associated with the logical channel based on the mapping information.