Polarization-Mapped RACH Transmission for Faster Wireless Access
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing random access channel (RACH) procedures due to the lack of effective mapping relationships between synchronization signal blocks (SSB) and polarization information, which affects communication reliability and latency, especially in next-generation radio access technologies.
Innovation Solution
A method and apparatus for transmitting a random access channel (RACH) based on polarization information, where user equipment (UE) receives a synchronization signal block (SSB), determines a RACH occasion, and transmits the RACH with polarization information, including right-handed circular polarization (RHCP) or left-handed circular polarization (LHCP), using preconfigured mapping orders to align SSB indices with preamble and polarization indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarization information is not mapped with SSB indices in RACH procedure, then the system maintains simpler configuration, but communication reliability and access efficiency deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-configuring mapping relationships between SSB indices, preamble sequences, and polarization indices before RACH procedure execution. The network device pre-determines which preamble sequences and polarization states correspond to each SSB index, allowing UEs to efficiently select appropriate RACH resources without real-time complex decision-making, thus improving reliability while maintaining configuration manageability
Solution Approach 2:
The patent segments the RACH procedure by introducing polarization domain segmentation alongside traditional time-frequency resource segmentation. By dividing RACH resources into distinct polarization states (e.g., RHCP and LHCP) associated with different SSB indices, the system creates multiple independent access channels, improving communication reliability through diversity while organizing complexity into manageable segmented components
2Loss of time
If traditional RACH procedure without polarization mapping is used, then the procedure is simpler to implement, but access latency increases
Solution Approach 1:
The patent introduces polarization as an additional dimension for RACH resource identification beyond traditional time-frequency resources. By mapping SSB indices to both preamble sequences and polarization states, the system creates a multi-dimensional resource space that enables faster access without complicating the fundamental procedure flow, as UEs can directly select resources based on SSB measurements without additional signaling steps
3Productivity
If polarization information is integrated into RACH mapping, then RACH transmission efficiency improves, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a mapping mechanism that serves multiple functions simultaneously: SSB index to preamble sequence mapping for resource identification, SSB index to polarization index mapping for diversity selection, and implicit association for beam correspondence. This multi-functional approach improves RACH transmission efficiency by consolidating multiple operations into a unified mapping framework rather than requiring separate mechanisms for each function
Solution Approach 2:
The patent uses copying by creating parallel mapping structures where polarization indices are copied/aligned with preamble sequence indices based on SSB indices. This allows the system to maintain identical mapping patterns across different resource dimensions (preamble, polarization, time-frequency), enabling efficient resource selection through pattern matching while reducing the need for complex unique mappings in each dimension
Data Source
AI summary
According to various embodiments, disclosed are a method for transmitting a random access channel (RACH) on the basis of polarization information by a terminal in a wireless communication system, and a device therefor. Particularly, the method comprises the steps of: receiving a synchronization signal block (SSB); determining a RACH occasion on the basis of the SSB; and transmitting the RACH in the RACH occasion, wherein the terminal obtains the polarization information relating to the RACH on the basis of the index of the SSB, and transmits the RACH having the polarization information.