Radio Transmission Device Preamble Group Segmentation
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Solution Overview
Problem
In LTE systems, increasing the number of signatures to reduce control information bias leads to increased circuit complexity for correlation calculations, while reducing signatures decreases resource use efficiency.
Innovation Solution
A radio transmitting apparatus and method that selects a signature based on access type and control information, generating a RACH preamble with a matching code pattern, allowing efficient resource use without altering the number of signatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of signatures is increased to reduce control information bias, then collision frequency decreases, but circuit complexity for correlation calculation increases
Solution Approach 1:
The invention segments the signature space by introducing a group number that divides signatures into multiple groups. Each group is independently managed with its own correlation calculation, allowing the system to handle control information bias without requiring a proportional increase in total signatures. This segmentation reduces the complexity burden on the correlation calculation circuit while maintaining collision reduction effectiveness.
Solution Approach 2:
The invention adds a new dimension (group number) to the signature structure beyond the traditional signature index. By organizing signatures into groups and using group numbers to differentiate between groups, the system can reduce collisions for biased control information without linearly increasing the total number of signatures required. This dimensional addition allows more efficient use of the signature space.
2Device complexity
If the number of signatures is decreased, then circuit complexity for correlation calculation is reduced, but resource use efficiency decreases
Solution Approach 1:
By segmenting signatures into groups and independently managing each group, the system can use fewer total signatures while maintaining resource use efficiency. The segmentation allows the correlation calculation circuit to operate on smaller, manageable groups rather than requiring a large unified signature space, thus reducing circuit complexity while preserving productivity.
Solution Approach 2:
The invention changes the parameter organization by introducing group numbers and associating control information with specific groups rather than requiring a direct mapping to individual signatures. This parameter reorganization allows the system to achieve the same resource use efficiency with fewer total signatures, reducing the burden on correlation calculation circuits.
3Reliability
If more signatures are provided to handle control information bias, then collision rate decreases, but the amount of control information that can be transmitted decreases
Solution Approach 1:
By adding the group number dimension to the signature structure, the invention enables the system to reduce collisions for biased control information without sacrificing control information capacity. The group number provides an additional degree of freedom that allows differentiation between multiple instances of the same control information, maintaining full information transmission capability while reducing collisions.
Solution Approach 2:
Segmenting the signature space into groups allows the system to maintain control information capacity by associating each control information type with a specific group. This segmentation enables the system to handle bias by distributing control information across groups rather than requiring a large total signature count, thus preserving information capacity while reducing collision rates.
Data Source
AI summary
A mobile station includes communication control circuitry that selects a preamble contained in a first Random Access Preamble group when a message size based on data available for transmission does not meet a first condition or when a value calculated based on a reference signal received power of downlink does not meet a second condition, a preamble contained in a second Random Access Preamble group when the message size based on data available for transmission meets the first condition and the value calculated based on the reference signal received power of downlink meets the second condition, and a preamble contained in the third Random Access Preamble group for a handover, independent of the message size based on data available for transmission and the value calculated based on the reference signal received power of downlink. The communication control circuitry also generates and transmits a selected preamble.