Uplink Grant Discarding via Zero Buffer Status Report
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need to efficiently manage uplink grants after the last transmission to avoid unnecessary power consumption and resource waste, especially when buffer status reporting indicates zero data availability.
Innovation Solution
User Equipment (UE) ignores or discards uplink grants received after transmitting a buffer status report with zero buffer size, preventing additional transmissions and optimizing resource usage by considering the last transmission as successful.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE processes and transmits uplink grants received after the last uplink transmission, then the uplink communication reliability is improved, but the power consumption and resource waste increase
Solution Approach 1:
The UE performs preliminary action by transmitting a Buffer Status Report (BSR) with zero buffer size after the last uplink transmission, indicating to the eNodeB that no further transmissions are needed. This preliminary notification prevents the eNodeB from allocating additional uplink grants, thereby avoiding unnecessary power consumption and resource usage while maintaining communication reliability.
2Reliability
If the UE processes and transmits uplink grants received after the last uplink transmission, then the uplink communication reliability is improved, but the resource waste increases
Solution Approach 1:
The UE sends a BSR with zero buffer size as a preliminary action to inform the eNodeB that the buffer is empty and no further uplink transmissions are required. This prevents the eNodeB from allocating additional uplink resources, thereby eliminating resource waste while ensuring that necessary communications are completed reliably.
3Use of energy by moving object
If the UE ignores uplink grants received after the last uplink transmission, then the power consumption is reduced, but the communication protocol compliance may be affected
Solution Approach 1:
The UE uses feedback mechanism by transmitting a BSR with zero buffer size to the eNodeB, providing explicit information about the buffer status. This feedback allows the eNodeB to understand that no further uplink grants should be allocated, enabling the UE to ignore subsequent grants without violating protocol compliance, thus reducing power consumption while maintaining reliability.
Data Source
Figure 1~2A
Figure 2B
Figure 3(a)~4
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for processing an uplink grant after the last uplink transmission in wireless communication system, the method comprising: transmitting uplink data with a buffer status reporting (BSR); receiving uplink grant after the BSR is transmitted; and discarding the received uplink grant if the received uplink grant is for new transmission and a buffer size of the BSR is set to zero.