Random Access Channel Determination in TDD UpPTS
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Solution Overview
Problem
Current methods for determining the number of random access channels in an uplink pilot time slot (UpPTS) in LTE systems require significant system memory overhead, and existing methods for sending a sounding reference signal (SRS) consume excessive system resources.
Innovation Solution
A method for determining the number of random access channels in UpPTS by calculating configuration parameters such as downlink-to-uplink switch-points, density of PRACHs, system frame number, and PRACH configuration index, and a method for sending SRS by determining resource parameters including SRS bandwidth and tree-like structure layers, allowing for reduced memory and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to determine the number of random access channels in UpPTS, then the system can support random access functionality, but the system memory overhead becomes excessive
Solution Approach 1:
The patent extracts only the necessary configuration parameters (downlink-to-uplink switch-points, density of PRACHs, system frame number, PRACH configuration index) from the complete random access channel determination process, calculating only what is needed for UpPTS rather than maintaining full random access channel information in memory. This selective extraction reduces memory overhead while preserving essential random access functionality.
Solution Approach 2:
The patent changes the approach from storing complete random access channel configurations to using a simplified set of configuration parameters that can be used to calculate the number of PRACHs in UpPTS. By transforming the problem from memory storage to parameter-based calculation, the system achieves the same functional result with significantly reduced memory requirements.
2Reliability
If existing methods are used to send sounding reference signal, then the system can perform uplink channel quality measurement, but excessive system resources are consumed
Solution Approach 1:
The patent extracts only the essential resource parameters needed for SRS transmission (SRS bandwidth and tree-like structure layers) from the complete resource allocation framework. By determining only these critical parameters rather than allocating full resource configurations, the system maintains uplink channel quality measurement capability while reducing overall system resource consumption.
Solution Approach 2:
The patent transforms the resource allocation approach from comprehensive resource assignment to parameter-based resource determination. By using a compact set of parameters (bandwidth, tree-like structure layers) to define SRS resources, the system achieves efficient uplink channel measurement with reduced resource overhead compared to traditional methods.
Data Source
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AI summary
The present invention provides a method for determining the number of random access channels which is applied to a time division duplex system. The method comprises: a terminal determining configuration parameters related to the number of the random access channels in an UpPTS based on system configuration, said configuration parameters including the number of downlink-to-uplink switch-points in one radio frame NSP, the density of PRACHs in a random access configuration DRA, a system frame number of a system frame in which said UpPTS is located nf, and a version index corresponding to a PRACH configuration index rRA; and said terminal then calculating directly the number of the PRACHs in said UpPTS based on the configuration parameters. The present invention also provides a method for sending a SRS of a time division duplex system using the method for determining the number of the random access channels. The method may calculate the number of the PRACHs in the UpPTS conveniently, thereby reducing system memory overhead.