Terminal Device Random Access Uplink Transmission Control
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Solution Overview
Problem
In conventional random access procedures, terminal devices perform unnecessary uplink transmission during non-contention random access, leading to interference and increased power consumption, even when no data needs to be sent.
Innovation Solution
The method involves configuring the terminal device's MAC entity to ignore uplink transmission in non-contention random access procedures initiated by a physical downlink control channel (PDCCH) order, specifically when the random access preamble index is not zero, thereby skipping uplink transmission for hybrid automatic repeat request (HARQ) entities and not generating MAC protocol data units (PDUs) unless data is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs uplink transmission in non-contention random access procedure, then the random access procedure can be completed, but unnecessary uplink transmission interference is caused and power is consumed
Solution Approach 1:
The patent changes the parameter of uplink transmission by introducing a conditional judgment: the terminal device checks whether it has uplink data to transmit before performing uplink transmission. This parameter change (from unconditional transmission to conditional transmission based on data availability) resolves the contradiction by eliminating unnecessary transmissions that cause interference while preserving necessary transmissions for random access completion
2Reliability
If the terminal device performs uplink transmission in non-contention random access procedure, then the random access procedure can be completed, but power consumption increases
Solution Approach 1:
The patent changes the transmission parameter from fixed to dynamic by adding a data availability check. The terminal device now adapts its transmission behavior based on whether it has data to send, thereby reducing power consumption when data is absent while ensuring transmission occurs when data is present, resolving the energy efficiency contradiction
3Object-generated harmful factors
If the terminal device skips uplink transmission when no data is present, then unnecessary interference is reduced, but the random access procedure may be affected
Solution Approach 1:
The patent resolves this contradiction by making the transmission parameter conditional rather than absolute. The terminal device evaluates the data availability parameter and adjusts transmission behavior accordingly: skipping transmission when data is absent (reducing interference) while performing transmission when data is present (maintaining reliability). This conditional parameter change ensures both objectives are achieved
Data Source
AI summary
The present application relates to a method for processing a random access procedure and a terminal device. The method is applied to a terminal device. In a non-contention random access procedure satisfying a predetermined condition, upon receipt of a random access response (RAR), if there is no data to be uplink transmitted, then no uplink transmission is performed. The embodiments of the present application are able to reduce unnecessary uplink transmission interference without affecting a random access procedure.