Terminal Random Access Timing Adjustment in Unlicensed Bands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The random access procedure in unlicensed bands is prone to failure and delays due to interference from other wireless communication systems, leading to prolonged communication setup times in wireless communication systems like 4G and 5G.
Innovation Solution
A method for performing the random access procedure in unlicensed bands by adjusting the transmission timing and frequency of signals using configuration information, allowing flexible resource allocation and reducing the likelihood of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the random access procedure is performed in unlicensed bands, then the data rate and capacity are increased, but the reliability is deteriorated due to interference from other wireless communication systems
Solution Approach 1:
The base station transmits downlink control information in advance that includes timing adjustment information before the terminal needs to transmit the third signal. This preliminary timing configuration allows the terminal to adjust its transmission timing proactively, avoiding interference from other wireless communication systems and improving the reliability of the random access procedure in unlicensed bands.
Solution Approach 2:
The patent applies dynamic timing adjustment where the terminal adjusts the transmission timing of the third signal based on timing adjustment information received from the base station. This dynamic adaptation allows the system to respond to interference conditions in real-time, optimizing the reliability of random access procedures in unlicensed spectral resources.
2Device complexity
If the transmission timing is fixed, then the device complexity is reduced, but the adaptability is deteriorated due to inability to avoid interference
Solution Approach 1:
The base station provides timing adjustment information in advance through downlink control information, allowing the terminal to pre-configure its transmission timing. This preliminary action maintains relative simplicity in the terminal's timing control mechanism while enabling it to adapt to interference conditions by following pre-provided timing adjustments.
Solution Approach 2:
The system implements a feedback mechanism where the base station receives first feedback information from the terminal and uses this feedback to determine timing adjustment information. This feedback loop enables the system to adapt to actual interference conditions while maintaining manageable complexity through base station-controlled timing adjustments.
3Ease of operation
If the random access procedure uses standard timing, then the ease of operation is maintained, but the loss of time is increased due to prolonged communication setup
Solution Approach 1:
The base station transmits downlink control information with timing adjustment information before the terminal needs to complete the random access procedure. This preliminary timing configuration allows the terminal to transmit the third signal at an optimized time, reducing the overall communication setup time while maintaining the simplicity of the standard four-step random access procedure.
Solution Approach 2:
The patent changes the timing parameter of the third signal transmission based on timing adjustment information received from the base station. This parameter adjustment optimizes the communication setup time by aligning the terminal's transmission with favorable interference conditions, thereby reducing the loss of time without complicating the operational procedure.
Data Source
AI summary
A terminal capable of performing a random access procedure, the terminal includes a receiver, a controller, and a transmitter. The receiver configured to receive a first signal of the random access procedure from a base station. The controller configured to control a transmission timing at which a second signal of the random access procedure is transmitted according to configuration information associated with a transmission timing. The transmitter configured to transmit, to the base station, the second signal in an unlicensed band at the transmission timing.