Scrambling Sequence Configuration for Enhanced Control Channel Capacity
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Solution Overview
Problem
Current communication technologies, particularly in the context of enhanced physical downlink control channels (ePDCCH), face challenges in supporting multiple users on the same time-frequency resource position and distinguishing between users, channels, and information due to limited transmission modes, which restricts capacity and performance.
Innovation Solution
A method and device for configuring scrambling sequences in user equipment and base stations that determine initialization values for scrambling sequences based on search spaces and transmission modes, allowing for distinct scrambling sequences for each user or channel, enabling simultaneous transmission on shared resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional control channel using distributed mode is used, then implementation is simple, but only one user can perform information transmission at a same time-frequency resource position, limiting capacity
Solution Approach 1:
The control channel is segmented into two distinct transmission modes: distributed mode for single-user transmission and localized mode for multi-user transmission. This segmentation allows the system to select appropriate modes based on capacity requirements, resolving the contradiction between simplicity and capacity by providing differentiated transmission paths.
Solution Approach 2:
The system dynamically selects between distributed mode and localized mode based on traffic conditions and user requirements. When multiple users need simultaneous transmission, localized mode is activated; otherwise, distributed mode is used. This dynamic adaptability increases control channel capacity without permanently increasing system complexity.
2Productivity
If multiple users transmit on the same time-frequency resource position, then capacity increases, but distinction between users and channels becomes difficult without proper scrambling
Solution Approach 1:
Different scrambling sequences are assigned to different users and channels transmitting on the same time-frequency resources. Each user equipment and base station uses locally configured scrambling initialization values based on their specific identities (cell ID, user ID, search space type), ensuring that while capacity increases through multi-user transmission, each user's data remains distinctly identifiable through unique scrambling patterns.
3Reliability
If scrambling sequences are configured for multiple transmission modes and search spaces, then user and channel distinction improves, but system complexity increases
Solution Approach 1:
The scrambling sequence generation is designed to be self-configuring based on publicly available parameters. User equipment and base stations automatically determine the appropriate scrambling initialization values using their cell identity, user identity, and search space type without requiring complex external configuration. This self-service mechanism improves user and channel differentiation while minimizing system complexity by eliminating the need for manual scrambling configuration management.
Data Source
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AI summary
The present invention provides a method and a device for scrambling sequence configuration, a user equipment, and a base station. The method includes: obtaining a search space and/or a transmission mode corresponding to an enhanced control channel; performing a scrambling initialization operation according to the search space and/or the transmission mode, and determining an initialization value of a scrambling sequence; determining the scrambling sequence according to the initialization value of the scrambling sequence; and scrambling a transmission signal transmitted by the enhanced control channel according to the scrambling sequence and then transmitting, so that a user equipment which receives the transmission signal performs a descrambling operation according to the scrambling sequence in the transmission signal. According to the present invention, the base station or the user equipment determines the initialization value of the scrambling sequence according to the search space or the transmission mode, or the base station or the user equipment determines the initialization value of the scrambling sequence according to both the search space and the transmission mode, thus randomization of interferences between different cells or terminals can be guaranteed as far as possible.