Dynamic Seed Allocation for Downlink DMRS in Multi-Node Wireless Systems
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Solution Overview
Problem
In wireless communication systems, existing methods lack an efficient dynamic allocation mechanism for seed values used to generate downlink demodulation reference signals (DMRS) in multi-node systems, particularly in CoMP communication schemes, which affects signal processing and data throughput.
Innovation Solution
A method for dynamically allocating or indicating a seed value for DMRS generation in wireless communication systems, where user equipment (UE) receives a candidate seed list and downlink control information (DCI) to select a seed value from the list based on indication information, incorporating hybrid automatic repeat request (HARQ) process identifiers and virtual cell identifiers, enabling flexible DMRS sequence generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional centralized antenna system is used, then the transmission area per antenna is large, but the signal-to-interference-plus-noise ratio (SINR) is reduced and path loss increases
Solution Approach 1:
The patent divides the transmission system into multiple distributed nodes instead of using a single centralized antenna. Each node transmits reference signals with different cyclic shifts, allowing the transmission area to be segmented across multiple locations while maintaining high SINR through cooperative communication and reduced interference.
Solution Approach 2:
The patent introduces a new dimension of spatial distribution by deploying multiple nodes at different locations rather than concentrating antennas in one place. This dimensional change from centralized to distributed architecture enables simultaneous coverage of large areas while maintaining signal quality through coordinated transmission.
2Reliability
If multiple nodes are distributed to increase channel capacity and SINR, then the transmission area per antenna is reduced, but the system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring cyclic shift values for different nodes before transmission. This allows the system to manage multiple distributed nodes with reduced real-time processing complexity, as the reference signal generation parameters are predetermined rather than calculated dynamically for each transmission.
Solution Approach 2:
The patent uses parameter changes by varying cyclic shift values across different nodes to differentiate their reference signals. This parameter differentiation enables the system to manage multiple nodes efficiently without increasing complexity, as each node uses a distinct cyclic shift parameter that can be configured and maintained independently.
3Productivity
If dynamic seed value allocation is implemented for DMRS generation, then the data throughput and signal processing efficiency are improved, but the control information overhead increases
Solution Approach 1:
The patent applies universality by using cyclic shift values that serve dual purposes: they differentiate reference signals from multiple nodes and simultaneously function as implicit seed value indicators for DMRS generation. This multi-functionality allows dynamic seed allocation without adding separate control overhead, as the same parameter serves both reference signal identification and scrambling seed indication.
Solution Approach 2:
The patent uses cyclic shift values as an intermediary that bridges reference signal differentiation and DMRS seed indication. Instead of requiring separate explicit signaling for seed values, the system uses the cyclic shift parameter as an intermediary that carries dual information, thereby improving throughput without increasing control overhead.
Data Source
AI summary
The method for receiving a downlink signal in a wireless communication system, according to one embodiment of the present invention, comprises: receiving, from a base station, a candidate seed list and downlink control information for the generation of a sequence of a downlink demodulation reference signal, wherein a seed value is selected from the candidate seed list on the basis of seed value indicating information contained in the downlink control information and the sequence of the downlink demodulation reference signal is generated by using the selected seed value. The candidate seed list may include a plurality of hybrid automatic repeat request (HARQ) process identifiers and virtual cell identifiers related to the plurality of HARQ process identifiers.