DM-RS Resource Allocation via Multi-Dimensional Orthogonal Signaling
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Solution Overview
Problem
In wireless communication systems with multiple mobile stations using the same resource in a cell, the limited resources allocated for demodulation reference signals (DM-RS) can lead to decreased channel estimation accuracy, especially when multiple input multiple output (MIMO) layers are involved, causing impediments in data demodulation.
Innovation Solution
A wireless communication system where a base station selects and transmits identification information to mobile stations to specify unique resources for DM-RS transmission, using a scheduler unit to determine group numbers based on received power or CSI-RS identifiers, ensuring exclusive resource allocation and improved channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cyclic shift amount is increased to allocate more resources for DM-RS transmission, then the number of mobile stations that can simultaneously communicate is increased, but the resources may still be insufficient when the number of mobile stations exceeds the available cyclic shift values
Solution Approach 1:
The patent extends the resource allocation from a single dimension (cyclic shift amount with 8 values) to multiple dimensions by introducing group number and sequence number. This creates a three-dimensional resource space (group number, sequence number, cyclic shift amount) that significantly increases the total number of allocatable DM-RS resources, allowing many more mobile stations to communicate simultaneously without resource conflict.
2Productivity
If the same resource is allocated to multiple mobile stations to increase system capacity, then more mobile stations can use the same time and frequency resource, but the channel estimation accuracy decreases due to resource conflicts
Solution Approach 1:
The patent segments the DM-RS resource space into multiple independent dimensions (group number, sequence number, cyclic shift amount). Each mobile station is assigned a unique combination of these segments, ensuring that even when multiple stations share the same time and frequency resources, their DM-RS signatures remain orthogonal and distinguishable, thereby maintaining channel estimation accuracy while increasing system capacity.
3Adaptability or versatility
If the cyclic shift interval is made small to increase resource granularity, then more fine-grained resource allocation is possible, but signals from multiple mobile stations overlap when large multipath is generated
Solution Approach 1:
The patent compensates for the reduced signal separation capability in the cyclic shift dimension by introducing additional orthogonal dimensions (group number and sequence number). This multi-dimensional orthogonality ensures that even with small cyclic shift intervals, signals from multiple mobile stations experiencing large multipath can be reliably separated through joint processing across all dimensions.
Data Source
AI summary
A radio communications system includes a base station and a mobile station configured to perform communication with the base station. The base station includes a selection unit and a first transmission unit. The selection unit selects identification information specifying a resource used by the mobile station for transmission of a signal from among a plurality of resources. The first transmission unit transmits the identification information to the mobile station. The mobile station includes a reception unit and a second transmission unit. The reception unit receives the identification information transmitted by the first transmission unit. The second transmission unit transmits the signal to the base station using the resource specified by the identification information.