Multi-Antenna Control Apparatus With Shared Scrambling for Reliable RACH
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Solution Overview
Problem
Existing systems with high-density antenna arrangements lack efficient procedures for establishing connections between base station apparatuses and terminal apparatuses, leading to increased RACH processing failures and suboptimal communication quality.
Innovation Solution
A control apparatus uses a scrambling sequence based on a second identification information different from its own if the received random access preamble does not follow its initial setting, enabling cooperation with neighboring control apparatuses to improve communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plurality of antennas are arranged with high density and selectively used for communication, then communication quality uniformity is improved, but connection establishment efficiency deteriorates due to lack of defined procedures
Solution Approach 1:
The base station apparatus performs preliminary actions by notifying the terminal apparatus of settings (including scrambling sequence identification information) before the terminal apparatus transmits the random access preamble. This allows the terminal apparatus to prepare the appropriate preamble and identification information in advance, enabling efficient connection establishment without requiring complex real-time procedures in the high-density antenna system.
Solution Approach 2:
The identification information (such as virtual cell ID or scrambling sequence ID) acts as an intermediary that bridges the terminal apparatus and the plurality of antennas. The terminal apparatus includes this identification information in the random access preamble, allowing the base station to determine which antenna should handle the connection and which scrambling sequence to use, thus establishing efficient connection procedures in the high-density antenna system.
2Reliability
If the terminal apparatus uses a scrambling sequence based on identification information different from the base station's own setting, then communication reliability is improved through base station cooperation, but device complexity increases
Solution Approach 1:
The base station apparatus uses a scrambling sequence based on identification information (such as virtual cell ID or neighboring cell ID) that is different from its own cell ID. This copying approach allows the base station to cooperate with neighboring base stations using their identification information, improving communication reliability without requiring complex multi-base station coordination protocols. The terminal apparatus simply uses the identification information provided in the settings, keeping the implementation relatively simple.
Data Source
AI summary
A control apparatus that wirelessly communicates with a terminal apparatus scrambles, when a random access preamble is received from the terminal apparatus, if the random access preamble is not based on a setting notified by the control apparatus, communication with the terminal apparatus after the random access preamble is received, using a scrambling sequence that is based on second identification information different from first identification information corresponding to the control apparatus.