Random Access Response Multiplexing for Low-Latency Uplink Sync
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Solution Overview
Problem
The challenge in wireless communication systems is to reduce data signal transmission delay, particularly in out-of-sync scenarios, to support ultra-reliable and low-latency communication (URLLC) services in 5G networks, and to minimize carrier sensing delays in unlicensed bands.
Innovation Solution
Multiplexing or concatenating signals for synchronization processing with data signals, including control information, during random access procedures in both licensed and unlicensed bands, to facilitate faster transition to synchronized states and reduce carrier sensing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If separate transmission of random access signals and data signals is used, then signal transmission reliability is maintained, but data signal transmission delay increases
Solution Approach 1:
The patent combines the random access signal transmission and data signal transmission into a single integrated procedure. The base station transmits both the random access signal and the data signal simultaneously in the same time resource, eliminating the sequential transmission steps and reducing overall transmission delay while maintaining signal reliability through proper multiplexing techniques
2Productivity
If frequent carrier sensing is performed, then transmission reliability is ensured, but transmission efficiency decreases
Solution Approach 1:
The base station performs carrier sensing in advance before the integrated signal transmission. By conducting the sensing procedure beforehand to determine channel availability, the system can proceed directly to transmission without needing frequent interruptions for sensing, thus improving transmission efficiency while maintaining reliability through the preliminary channel assessment
Data Source
AI summary
A base station performing random access procedure includes: processor circuitry configured to generate a protocol data unit which includes: a first unit including a random access response, the random access response not including an uplink grant, the random access response signal including information on uplink power control, and a second unit including data; and a transmitter configured to transmit the protocol data unit.