DMRS Scrambling Sequence Randomization for CoMP Interference
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Solution Overview
Problem
In LTE and LTE-A systems, existing technologies face challenges in effectively randomizing interference between signals from multiple base stations during CoMP transmission, which affects data rate and reception quality for User Equipment (UE) far from a base station.
Innovation Solution
The method involves transmitting candidate sets of initial state information for DMRS scrambling sequences to User Equipment (UE) from multiple transmission points, allowing the UE to determine and generate unique scrambling sequences for each transmission point, thereby randomizing interference and enhancing CoMP transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple base stations transmit data to a UE simultaneously in CoMP transmission, then system throughput and data rate are improved, but signal interference between transmission points increases
Solution Approach 1:
The patent changes the parameter of scrambling sequences by transmitting multiple candidate sets with different initial states to the UE. Each candidate set corresponds to a different transmission point, allowing the UE to generate unique scrambling sequences for each transmission point. This parameter differentiation effectively randomizes and reduces signal interference between multiple base stations while maintaining the benefits of CoMP transmission for system throughput.
2Device complexity
If the same scrambling sequence is used by multiple transmission points, then device complexity is reduced, but interference randomization capability deteriorates
Solution Approach 1:
The patent applies preliminary action by having the base station transmit multiple candidate sets of initial state information to the UE in advance. These candidate sets are prepared beforehand, each corresponding to a different transmission point. The UE then selects the appropriate candidate set based on the actual transmission point, enabling interference randomization without requiring complex real-time scrambling sequence generation at the UE side.
3Object-affected harmful factors
If the UE generates unique scrambling sequences for each transmission point, then interference randomization is improved, but computational complexity at the UE increases
Solution Approach 1:
The patent changes the parameter of initial states for scrambling sequences by providing multiple candidate sets to the UE. Instead of requiring the UE to generate complex scrambling sequences from scratch, the UE simply selects the appropriate candidate set based on the transmission point identification. This approach achieves unique scrambling sequences for each transmission point while keeping UE computational complexity low.
Data Source
AI summary
A data transmission method and an apparatus in a network supporting coordinated multipoint transmission are provided. The method includes transmitting candidate sets of initial state information used to generate Demodulation Reference Signal (DMRS) scrambling sequences for the transmission points to the UE, and transmitting an indication corresponding to at least one candidate set of initial state information respectively associated with at least one transmission point to the UE, wherein the initial state information is used by the UE to generate DMRS scrambling sequences.