Wireless Communication Node Preamble Power Control for PRACH Coverage
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Solution Overview
Problem
The coverage of the physical random access channel (PRACH) in wireless communication systems has not been adequately enhanced, leading to challenges in random access performance, particularly in scenarios with high uplink traffic, such as video uploading, and existing mechanisms for determining preamble transmit power increments are inadequate for repeated PRACH transmissions.
Innovation Solution
A method involving sending multiple preambles on non-overlapping time-frequency resources with a counter-based power increment determination, where the transmit power is adjusted based on a counter and a step size, optimizing power usage and enhancing random access performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing counter-based power increment mechanism is used for repeated PRACH transmissions, then the transmit power can be increased, but the random access success probability cannot be ensured due to inadequate power increment control
Solution Approach 1:
The patent introduces dynamic power control by making the power increment adaptive rather than fixed. The counter is updated based on whether the previous preamble transmission was successful or failed, allowing the system to dynamically adjust power increments according to transmission outcomes. This dynamic approach resolves the contradiction by providing reliable power control without requiring complex external coordination mechanisms.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device monitors its own preamble transmission results and uses this feedback to update the counter accordingly. When a preamble transmission fails, the counter is updated to increase future power increments; when successful, the counter is reset. This feedback loop ensures reliable random access while keeping the power control mechanism relatively simple by using only local decision-making based on transmission outcomes.
2Area of stationary object
If the transmit power is continuously increased through power ramping, then the coverage is extended, but unnecessary power ramping occurs when random access is already successful, wasting energy and potentially causing interference
Solution Approach 1:
The patent uses feedback from preamble transmission results to control power ramping. When random access is successful, the counter is reset to 0, immediately stopping further power increments. This feedback mechanism prevents unnecessary power ramping while maintaining coverage extension through power ramping when needed, thereby resolving the contradiction between coverage extension and energy waste.
Solution Approach 2:
The terminal device autonomously manages its own power control by monitoring transmission results and updating the counter without requiring external network intervention. This self-service approach allows the device to stop power ramping immediately upon successful access, preventing energy waste and potential interference while maintaining adequate coverage through selective power increases.
3Productivity
If multiple preambles are sent on non-overlapping time-frequency resources, then the random access opportunity is increased, but the power control complexity increases due to multiple counter update scenarios
Solution Approach 1:
The patent applies different counter update rules based on the specific transmission scenario (whether the previous transmission was successful or failed). This local quality approach allows the system to optimize power control for each scenario independently - using aggressive power increments for failed transmissions and resetting for successful ones - thereby increasing random access throughput without requiring a single complex unified control logic.
Solution Approach 2:
The patent makes the power control dynamic by adapting the counter update behavior to the transmission outcome. This dynamic approach allows the system to handle multiple time-frequency resources efficiently by adjusting power control parameters based on real-time transmission results, increasing access throughput while keeping the control logic relatively simple through conditional updates rather than complex multi-parameter coordination.
Data Source
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AI summary
The present application discloses a method and apparatus for a communication node used in wireless communication. A communication node sends at least two Preambles over K1 time-frequency resources, wherein K1 is a positive integer greater than 1; a first counter is updated according to K1; the Preambles are sent over K2 time-frequency resources by using a first target power value, wherein K2 is a positive integer; any two of the K1 time-frequency resources do not overlap in a time domain; any two of the K2 time-frequency resources do not overlap in the time domain, and the K2 time-frequency resources follow the K1 time-frequency resources; the Preambles sent over the K1 time-frequency resources and the Preambles sent over the K2 time-frequency resources relate to a first random access process; any two of the at least two Preambles are within a time interval during which the K1 time-frequency resources are sent, and the first counter is not updated; the first target power value is related to the product of the first counter and a first step size.