Random Access Message Repetition for Wireless Connectivity
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Solution Overview
Problem
Wireless communication systems, particularly 4G and 5G, face challenges in supporting high reliability and low latency random access communications due to low connectivity conditions, leading to increased communication failures and inefficiencies in resource utilization.
Innovation Solution
The implementation of a method where user equipment (UE) selects a random access request type based on channel quality, using a specific repetition pattern for the random access procedure, allowing the base station to configure a time window for repeated transmission of control information or data, enabling successful decoding and improving connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message repetition is implemented for random access procedure, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic message repetition where the base station determines whether to repeat random access responses based on detected channel conditions. The repetition pattern is dynamically adjusted - when poor connectivity is detected, multiple repetitions are transmitted; when conditions improve, repetitions are reduced or eliminated. This dynamic adaptation resolves the contradiction by providing high reliability only when necessary, rather than always using maximum repetition.
Solution Approach 2:
The system changes the repetition parameter (number of repetitions) based on channel quality indicators. The base station monitors channel conditions and adjusts the repetition count accordingly - increasing repetitions when channel quality is poor to maintain reliability, and decreasing repetitions when channel quality improves to reduce complexity and resource consumption.
2Reliability
If message repetition is implemented for random access procedure, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent employs dynamic repetition where the number of message repetitions is adjusted in real-time based on channel conditions. In poor connectivity scenarios, multiple repetitions are sent to ensure reliable delivery. When channel conditions improve, the system reduces or eliminates repetitions, thereby minimizing time loss while maintaining reliability when it matters most.
Solution Approach 2:
The system uses periodic channel quality assessments to determine whether message repetition is necessary. Instead of continuous repetition regardless of conditions, the base station periodically evaluates channel state and activates repetition only during periods of poor connectivity, reducing overall time consumption while maintaining reliability during critical periods.
3Reliability
If message repetition is implemented for random access procedure, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent implements dynamic message repetition where both the base station and UE adjust transmission energy based on channel conditions. When poor connectivity is detected, the system increases repetition count and transmission power to ensure reliable delivery. When channel conditions improve, the system reduces both repetition count and power consumption, resolving the contradiction between reliability and energy usage.
Solution Approach 2:
The system changes multiple parameters including repetition count and transmission power based on channel quality. By monitoring channel state information, the base station adjusts both the number of repetitions and the power level, ensuring reliable communication only when necessary rather than continuously operating at high energy consumption levels.
4Reliability
If message repetition is implemented for random access procedure, then reliability is improved, but productivity decreases
Solution Approach 1:
The patent employs dynamic message repetition that adapts to real-time channel conditions. The system maintains high reliability during poor connectivity by implementing repetitions, but switches to rapid single-transmission mode when channel conditions improve, thereby maximizing productivity during favorable periods while ensuring reliability during challenging periods.
Solution Approach 2:
The system periodically assesses channel quality and alternates between repetition mode and direct transmission mode. During periods of poor connectivity, repetitions are implemented to ensure reliability. During periods of good connectivity, the system transitions to faster direct transmission, improving overall productivity while maintaining reliability when needed.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may attempt to connect to a base station using a random access procedure. During the random access procedure, the base station may transmit control information and data associated with a random access response (RAR) during an RAR window. The UE may identify a channel quality and may transmit a random access request of a first type to the base station. The base station may receive the random access request and transmit repeating instances of the control information or the data, or both, based on identifying that the random access request is of the first type. The UE may use soft-combining to increase the likelihood of successfully decoding the control information and the data associated with the RAR, and likewise may increase the likelihood of successfully receiving the RAR from the base station.