5G Random Access DRX Control via RRC Reconfiguration
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently operating discontinuous reception (DRX) when a 2-step random access is used, particularly in 5G communication systems, which affects data transmission and power consumption.
Innovation Solution
A method is introduced where a terminal in a wireless communication system receives a radio resource control (RRC) reconfiguration message with synchronization, allowing it to transmit a first message including a physical random access channel (PRACH) and a physical uplink shared channel (PUSCH), and determines successful random access reception based on fallback random access responses, enabling efficient DRX operation during active times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 2-step random access is used, then access speed is improved, but DRX operation efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts the terminal's reception behavior based on the random access outcome. When random access is successful, the terminal transitions from DRX mode to continuous reception mode, adapting its operation to the current communication state to ensure timely data reception while minimizing unnecessary power consumption.
Solution Approach 2:
The patent establishes a predetermined reception window period following random access response. The terminal is configured to continuously receive data during this predetermined period without entering DRX mode, proactively preparing for potential downlink data arrival and avoiding the need to wake up from DRX, thus improving both speed and energy efficiency.
2Reliability
If continuous reception is maintained after random access, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic DRX operation with a specifically configured reception window following random access. The terminal alternates between active reception periods and sleep periods, ensuring reliable data reception during critical phases while conserving energy during stable periods. This periodic pattern balances reliability and power consumption by activating continuous reception only when necessary.
Data Source
AI summary
A terminal in a wireless communication system is provided. The terminal includes a transceiver, and at least one processor configured to receive, from BS, a RRC reconfiguration message including a reconfiguration with synchronization, transmit, to the BS, a first message including a PRACH, a PUSCH, and a C-RNTI MAC CE based on the reconfiguration with synchronization, control the transceiver to receive, from the BS, a first PDCCH and a PDSCH, wherein, for the case when the BS receives the PRACH and does not receive the PUSCH, the first PDCCH is a PDCCH addressed to RA-RNTI and the PDSCH includes a fallback RAR, and for the case when the BS receives the PUSCH, the first PDCCH is a PDCCH addressed to a C-RNTI corresponding to the C-RNTI MAC CE and the PDSCH includes an absolute timing advance command MAC CE, determine that a RAR reception is successful based on the at least one of the fallback RAR or the PDSCH, when a DRX is configured for the terminal via a RRC signalling, determine that active time for the DRX includes a time while a second PDCCH indicating new transmission addressed to a C-RNTI corresponding to the C-RNTI MAC CE has not been received after determining that the RAR reception is successful, and monitor the second PDCCH during the active time.