Random Access Resource Shift for Wireless Collision Reduction
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Solution Overview
Problem
In next-generation wireless communication systems, particularly in cellular IoT (CIoT), the high collision rate of random access requests due to the large number of devices attempting access simultaneously leads to inefficient resource utilization and increased retransmissions, resulting in a high collision probability.
Innovation Solution
A method where terminals select a radio resource for initial random access, transmit the request with a specified transmission period, number of retransmissions, and error tolerance, and receive uplink resource allocation information including an indication bit and resource shift information from the base station, allowing for dynamic adjustment of radio resources to mitigate collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple terminals transmit random access requests simultaneously using the same radio resources, then the random access procedure can be completed quickly, but the collision probability increases significantly
Solution Approach 1:
The patent applies dynamics by making the radio resource selection adaptive rather than static. Terminals dynamically adjust their resource selection based on network conditions, collision detection results, and timing relationships. The base station dynamically assigns different radio resources (time slots, frequency resources) to different terminals, allowing the system to optimize between access speed and collision avoidance in real-time
Solution Approach 2:
The patent introduces additional dimensions for resource differentiation beyond simple time-division multiplexing. It uses combinations of time resources (different subframes), frequency resources (different physical resource blocks), and code resources (different random access preambles) to create a multi-dimensional resource space. This allows terminals to be separated across multiple dimensions, reducing collisions while maintaining efficient access
2Reliability
If radio resources are allocated dynamically to adjust for peak access times, then collision probability decreases, but the complexity of resource management increases
Solution Approach 1:
The patent implements feedback mechanisms where terminals report collision detection results and access success/failure status to the base station. The base station uses this feedback to adjust future resource allocations, identify peak access periods, and optimize the timing relationships between terminals. This closed-loop feedback system enables adaptive resource management without requiring complex centralized control
Solution Approach 2:
The patent enables terminals to autonomously adjust their random access behavior based on detected collisions and received timing advance information. Terminals self-adjust their transmission timing, select alternative resources when collisions are detected, and manage their own access strategies without requiring complex centralized scheduling, thereby reducing overall system complexity
3Reliability
If terminals retransmit random access requests multiple times, then the probability of successful access increases, but the resource consumption and time delay increase
Solution Approach 1:
The patent applies preliminary action by having terminals detect potential collisions before actual transmission occurs, using timing advance information and detected timing relationships with other terminals. When potential collisions are predicted, terminals proactively select alternative radio resources or adjust transmission timing in advance, preventing retransmissions before they are needed
Data Source
AI summary
A method and a device for performing a random access in a wireless communication system are provided. Specifically, a wireless resource for transmitting a first random access request is selected, and the first random access request is transmitted through the wireless resource. The first random access request includes a transmission period of the first random access request, the frequency of retransmission, and an allowable error of the transmission period. Uplink resource allocation information is received in response to the first random access request. The uplink resource allocation information includes information on an indicator bit and a wireless resource shift. When the indicator bit is a preset value, a second random access request is transmitted through a wireless resource shifted from the wireless resource.