Terminal Device Random Access Cancellation for Buffer Status Reports
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Solution Overview
Problem
In current wireless communication systems, the random access procedure for terminal devices is not appropriately canceled, leading to unnecessary processes when a buffer status report is transmitted using a pre-allocated wireless resource without an explicit uplink grant, especially in semi-persistent scheduling scenarios.
Innovation Solution
The terminal device and base station device incorporate a cancellation control unit to determine whether to cancel the random access procedure based on the allocation status of wireless resources and message contents, specifically canceling the procedure when a buffer status report is transmitted using a pre-allocated resource or in response to an uplink grant, and continuing it when the report is transmitted with identification information in a random access response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the random access procedure is continued to ensure reliable scheduling request transmission, then the reliability of uplink data transmission is improved, but unnecessary processes are performed when a buffer status report is already transmitted using pre-allocated resources
Solution Approach 1:
The terminal device monitors whether a buffer status report has been successfully transmitted using pre-allocated uplink resources. Based on this feedback information, the random access procedure is appropriately canceled to avoid unnecessary processes while ensuring reliable scheduling request transmission when needed.
2Productivity
If the terminal device transmits a buffer status report using pre-allocated wireless resources without waiting for an uplink grant, then the productivity of data transmission is improved, but the random access procedure cannot be properly canceled
Solution Approach 1:
The terminal device uses feedback from the successful transmission of a buffer status report via pre-allocated resources to determine when to cancel the random access procedure. This feedback mechanism enables the device to improve productivity by transmitting data without waiting for grants while maintaining clear control logic for procedure cancellation.
3Ease of operation
If the random access procedure is canceled only when an uplink grant is received, then the control logic is simple, but the procedure is not canceled when a buffer status report is transmitted using pre-allocated resources
Solution Approach 1:
The cancellation condition for the random access procedure is made dynamic by considering multiple scenarios: (1) receipt of an uplink grant, and (2) successful transmission of a buffer status report using pre-allocated resources. This dynamic control logic improves productivity by enabling timely cancellation in both cases while maintaining operational simplicity through clear conditional rules.
Data Source
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AI summary
A terminal device (100) includes a generating unit (111) that generates a buffer status report indicating an amount of data accumulated in a transmission buffer of the terminal device when requesting transmission of data, a transmission control unit (112) that executes a random access procedure for transmitting the buffer status report, and a cancellation control unit (113) that is able to cancel a random access procedure being executed by the transmission control unit (112) when the buffer status report is transmitted using a first wireless resource that has been allocated in advance to the terminal device. The cancellation control unit (113) does not cancel the random access procedure when the buffer status report is transmitted using a second wireless resource provided by the random access procedure.