Two-Step Random Access Messaging with Power Control
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Solution Overview
Problem
Current mobile communication technologies face challenges in reducing time delay for mobile devices to access the network, particularly due to the complexity and inefficiency of existing random access procedures in LTE and emerging 5G systems, which impact energy consumption, device cost, spectral efficiency, and latency.
Innovation Solution
A simplified two-step random access procedure is introduced, where mobile devices repeatedly transmit a first message with increasing power levels until a successful reception is indicated or a threshold is reached, and a second message is received indicating the status of the procedure, incorporating features like payload and preamble retransmissions, dynamic grants, and flexible MAC control elements to enhance reliability and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional multi-step random access procedure is used, then network access reliability is improved, but access delay increases
Solution Approach 1:
The patent combines multiple random access messages into a single transmitted message. The first message includes both the preamble sequence (for uplink timing estimation) and the payload (for uplink data transmission) simultaneously, eliminating the need for separate message transmissions and reducing access delay while maintaining reliability through combined transmission
2Reliability
If power levels are increased for message transmission, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic power adjustment where the mobile device transmits the first message at different power levels based on reception feedback. If the communication node fails to decode the payload, it requests retransmission at a higher power level, optimizing the balance between transmission reliability and energy consumption by only increasing power when necessary
3Reliability
If multiple messages are transmitted separately, then message reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the preamble sequence and payload into a single first message transmission. The communication node extracts uplink timing information from the preamble sequence and processes the payload simultaneously, eliminating the need for separate message transmissions and reducing signaling overhead while maintaining message reliability through unified transmission
Data Source
AI summary
A method of wireless communication includes repeatedly transmitting, from a mobile device to a communication node, a first message using increasing power levels for initiating a two-step random-access procedure until a termination condition is met. The first message includes a payload part and optionally a preamble sequence. The termination condition includes (1) the mobile device receives an indication from the communication node that the payload part was received successfully, or (2) a number of repeated transmissions reaches a threshold.