Ultrahigh Frequency Initial Access via Pre-configured PRACH Parameters
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Solution Overview
Problem
Current wireless access systems face challenges in performing an initial access procedure efficiently in ultrahigh frequency bands, particularly in environments where system information blocks are not received, which hinders fast random access and data transmission.
Innovation Solution
A method and apparatus for performing a fast initial access procedure in ultrahigh frequency bands by receiving synchronization and broadcast channel signals, generating a Random Access Channel (RACH) preamble using prefixed Physical Random Access Channel (PRACH) parameters, and transmitting it, even without receiving a system information block, allowing for efficient data transmission and improved cell throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the initial access procedure is performed in ultrahigh frequency bands using conventional methods, then system compatibility is maintained, but access speed and efficiency deteriorate due to mandatory system information block reception
Solution Approach 1:
The patent applies preliminary action by pre-configuring PRACH parameters (preamble formats, frequency offsets, root sequence indexes, cyclic shift values) in the broadcast channel signal before transmission. This allows User Equipments to generate RACH preambles immediately upon receiving the broadcast channel, without needing to receive separate system information blocks, thereby accelerating the initial access process in ultrahigh frequency bands
Solution Approach 2:
The patent extracts the essential PRACH parameters from the system information block and embeds them directly in the broadcast channel signal. This separation allows the critical parameters needed for random access to be obtained independently, removing the dependency on the complete system information block reception and enabling faster access
2Productivity
If system information block reception is required for random access, then comprehensive system information is obtained, but access time increases and throughput decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring PRACH parameters (preamble formats, frequency offsets, root sequence indexes, cyclic shift values) in the broadcast channel signal before transmission. This allows User Equipments to generate RACH preambles immediately upon receiving the broadcast channel, without needing to receive separate system information blocks, thereby accelerating the initial access process in ultrahigh frequency bands
Solution Approach 2:
The patent implements partial action by providing only the essential PRACH parameters needed for random access in the broadcast channel, rather than transmitting the complete system information block. This partial provision of information is sufficient for the random access function while reducing transmission time and enabling faster access
3Ease of operation
If prefixed PRACH parameters are used for RACH preamble generation, then access speed improves, but parameter configuration complexity increases
Solution Approach 1:
The patent applies universality by designing the broadcast channel signal to serve multiple functions: it provides both synchronization information and pre-configured PRACH parameters for random access. This multi-functionality allows User Equipments to obtain all necessary parameters for preamble generation from a single signal, simplifying the access procedure despite the increased information content
Data Source
AI summary
The present invention provides a method for performing an initial access process used in a wireless access system and in an ultrahigh frequency band, and devices supporting same. The method for performing a high-speed initial access process in a wireless access system supporting an ultrahigh frequency band, according to one embodiment of the present invention, may comprise the steps of: receiving a synchronizing signal; receiving a broadcast channel signal; generating a random access preamble by using pre-fixed physical random access parameters according to a small cell supported in the ultrahigh frequency band; and transmitting the generated random access preamble on the basis of the synchronizing signal and the broadcast channel signal.