PDSCH Multi-Point Transmission with Split MIMO Parameter Sets
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Solution Overview
Problem
In next-generation wireless cellular communication systems, such as 5G, the alignment of Physical Downlink Shared Channel (PDSCH) transmission parameters from multiple Transmission Points (TPs) is challenging due to differences in MIMO layer configurations and Resource Allocation (RA) requirements, leading to ambiguities and increased overhead in Downlink Control Information (DCI) for Non-Coherent Joint Transmission (NC-JT) scenarios.
Innovation Solution
The proposed solution involves determining the PDSCH starting symbol based on MBSFN or non-MBSFN subframe rules, providing RA information per MIMO layer set or DM-RS AP group, and using polar codes for common coding of Channel State Information (CSI) components to enhance coding efficiency and reduce overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple Transmission Points transmit PDSCH with different MIMO layer configurations, then the system can support higher bandwidth and more diverse service requirements, but the alignment of PDSCH transmission parameters becomes challenging and DCI overhead increases
Solution Approach 1:
The patent segments the PDSCH transmission into multiple parts, where different TPs can transmit different parts with different MIMO layer configurations. The UE is configured with multiple parameter sets (first parameter set and second parameter set) corresponding to different TPs, allowing each TP to independently configure its transmission parameters while the UE processes them separately. This segmentation resolves the contradiction by allowing configuration flexibility at each TP while managing alignment complexity through structured parameter sets.
Solution Approach 2:
The patent introduces a new dimension of parameter set indexing, where each TP's PDSCH transmission is associated with a specific parameter set index. This additional dimension allows the system to manage multiple MIMO layer configurations without increasing the complexity of the basic transmission framework. By organizing parameters in indexed sets rather than attempting to align all parameters across TPs, the system achieves versatility while controlling complexity.
2Adaptability or versatility
If RA information is provided for each MIMO layer set or DM-RS AP group, then the system can support frequency selective DPS and diverse service requirements, but the number of DCI bits required for RA indication increases
Solution Approach 1:
The patent applies partial action by providing RA information selectively - only for the parameter sets that are actually needed for specific TPs or MIMO layer sets. Rather than providing complete RA information for all possible configurations, the system provides RA information on a per-parameter-set basis, reducing DCI overhead while still supporting frequency selective DPS where needed. This selective provision of information resolves the contradiction between versatility and overhead.
3Productivity
If traditional coding methods are used for CSI components, then the implementation is simpler, but the coding efficiency is lower and more overhead is required
Solution Approach 1:
The patent merges multiple CSI components (Channel Quality Indicator, Precoding Matrix Indicator, Rank Indicator) into a single unified polar code structure. Instead of encoding each CSI component separately using traditional methods, the invention combines them into one polar-coded transmission, which improves coding efficiency by exploiting the statistical properties of the combined CSI data. This merging approach achieves higher productivity while the polar code structure manages the complexity in a standardized manner.
Data Source
AI summary
Described is an apparatus of a User Equipment (UE) operable to communicate with a fifth generation Evolved Node-B (gNB) on a wireless network. The apparatus may comprise a first circuitry and a second circuitry. The first circuitry may be operable to determine a first parameter set and a second parameter set for establishing Physical Downlink Shared Channel (PDSCH) resources. The second circuitry may be operable to process a first part of a PDSCH transmission from a first set of Multiple Input Multiple Output (MIMO) layers corresponding with a first Multimedia Broadcast Single Frequency Network (MBSFN) configuration based on the first parameter set. The second circuitry may also be operable to process a second part of the PDSCH transmission from a second set of MIMO layers corresponding with a second MBSFN configuration based on the second parameter set.