Msg3 Buffer Transmission Control for Random Access Reliability
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Solution Overview
Problem
In the current LTE system, data stored in the Msg3 buffer is transmitted regardless of the reception mode of the UL Grant signal, leading to potential issues such as erroneous contention resolution and loss of BSR information.
Innovation Solution
The data stored in the Msg3 buffer is restricted to be transmitted only when the UL Grant signal is received on the random access response message, and new data is transmitted when the UL Grant signal is received on a masked PDCCH not associated with the random access response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data stored in the Msg3 buffer is transmitted regardless of the reception mode of the UL Grant signal, then the transmission efficiency is improved, but erroneous contention resolution and loss of BSR information occur
Solution Approach 1:
The patent applies local quality by differentiating the transmission behavior based on the reception mode of the UL Grant signal. When the UL Grant is received on the random access response message, data in the Msg3 buffer is transmitted. When received on a masked PDCCH not associated with random access response, new data is transmitted instead. This conditional approach ensures reliable contention resolution while maintaining transmission efficiency.
2Productivity
If data stored in the Msg3 buffer is transmitted regardless of the reception mode of the UL Grant signal, then the transmission efficiency is improved, but BSR information is lost
Solution Approach 1:
The patent prevents BSR information loss by applying local quality differentiation: when the UL Grant signal is received on the random access response message, the data in the Msg3 buffer (which may contain BSR information) is transmitted. This ensures that BSR information is preserved and transmitted only under appropriate conditions.
3Productivity
If data stored in the Msg3 buffer is transmitted regardless of the reception mode of the UL Grant signal, then the transmission efficiency is improved, but the random access procedure cannot be completed normally
Solution Approach 1:
The patent ensures normal completion of the random access procedure by applying local quality control: data in the Msg3 buffer is transmitted only when the UL Grant signal is received on the random access response message. This conditional transmission mechanism prevents erroneous operation of the CR timer and ensures the random access procedure completes successfully.
Solution Approach 2:
The patent uses feedback from the reception mode of the UL Grant signal to control data transmission. The system monitors whether the UL Grant is received on the random access response message or on a masked PDCCH, and adjusts transmission behavior accordingly. This feedback mechanism ensures reliable random access procedure completion while maintaining transmission efficiency.
Data Source
AI summary
A user equipment (UE) is configured to monitor, in discontinuous reception (DRX) operation and in a radio resource control connected (RRC_CONNECTED) state, physical downlink control channels (PDCCHs) during a first active time. The UE is further configured to receive, during the first active time, a PDCCH indicating a first new downlink transmission addressed to a cell radio network temporary identifier (C-RNTI) of the UE and receive the first new downlink transmission, based on the PDCCH addressed to the C-RNTI. The UE is configured to start or restart a DRX Inactivity Timer based on the PDCCH indicating the first new downlink transmission addressed to the C-RNTI. The UE is configured to monitor, in DRX operation and in RRC_CONNECTED state, PDCCHs during a second active time and then receive, during the second active time, a PDCCH indicating a second new downlink transmission addressed to a system information radio network temporary identifier (SI-RNTI).