Distributed Antenna Reference Signal Scrambling
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Solution Overview
Problem
Conventional cellular mobile communication systems with Central Antenna Systems (CAS) limit data rate for User Equipments (UEs) at the cell edge, as antennas are concentrated at the center, leading to inefficient reference signal generation and interference among UEs in the same resource block.
Innovation Solution
The method involves generating Demodulation Reference Signals (DM-RS) using distributed antennas within the service area of a base station, employing unique scrambling parameters and dynamic switching between new and legacy scrambling schemes to optimize DM-RS sequences for efficient resource allocation and interference reduction across multiple UEs in the same resource block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If antennas are concentrated at the center of the cell (CAS), then device complexity is reduced and ease of operation is improved, but data rate for UEs at the cell edge deteriorates and interference among UEs in the same resource block increases
Solution Approach 1:
The patent segments the single central antenna system into multiple distributed antenna groups, where each group serves a specific geographic region or UE cluster. This segmentation allows UEs at the cell edge to connect to nearby antenna groups, improving data rates while maintaining system operational simplicity through centralized control of the segmented components.
Solution Approach 2:
The patent transitions from a two-dimensional central antenna layout to a three-dimensional distributed antenna architecture, where antennas are spatially distributed across multiple locations and heights. This dimensional expansion enables better coverage for cell-edge UEs and reduces interference by separating antenna groups in space while maintaining centralized management.
2Productivity
If distributed antennas are deployed to improve data rate for cell edge UEs, then productivity is improved, but reference signal generation becomes less efficient and interference management becomes more complex
Solution Approach 1:
The patent implements a universal reference signal generation mechanism that serves multiple distributed antenna groups simultaneously. The same scrambling parameter structure and sequence generation algorithm are applied across all antenna groups, enabling efficient reference signal generation despite the distributed architecture, while maintaining consistent UE processing across the entire cell.
3Object-generated harmful factors
If distributed antennas are used to reduce interference among UEs, then harmful factors are reduced, but the complexity of managing multiple antenna groups increases
Solution Approach 1:
The patent assigns different scrambling parameters to different antenna groups, creating locally optimized reference signals that reduce interference among UEs served by the same antenna group. This local differentiation is achieved through a systematic parameter allocation scheme that maintains overall system coherence while enabling localized interference management.
Data Source
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AI summary
Methods and apparatus are provided for transmitting and receiving reference signals through distributed antennas deployed within a service area of a base station in a mobile communication system. First control information, including at least two scrambling factor combinations, is received at a terminal from the base station. Second control information, indicating one of the at least two scrambling factor combinations, is received at the terminal from the base station. The one of the at least two scrambling factor combinations is selected based on the second control information. An initial value of a demodulation reference signal sequence is calculated using the selected scrambling factor combination. The demodulation reference signal sequence is received using the initial value.