Multiple Scrambling IDs for Inter-TRP Interference

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Solution Overview

Problem

In wireless communications, particularly in Release 15, a UE can only communicate with one TRP, limiting the configuration of PDSCH scrambling IDs, which restricts interference randomization across multiple TRPs in Release 16, where multiple TRPs transmit simultaneously.

Innovation Solution

Configuring multiple scrambling IDs for PDSCHs transmitted from different TRPs by associating each TRP with a unique scrambling ID using CORESET indices or CORESET groups, allowing PDSCHs from each TRP to be scrambled with a distinct sequence, thereby reducing inter-TRP interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple TRPs transmit simultaneously in Release 16, then communication capacity and reliability are improved, but inter-TRP interference increases

Engineering Contradiction:

Improvecommunication capacityVSAvoidinter-TRP interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by modifying the scrambling ID parameter to differentiate transmissions from different TRPs. By configuring multiple scrambling IDs (first scrambling ID and second scrambling ID) and associating them with different TRPs, the system changes the scrambling sequence parameter to randomize and reduce inter-TRP interference while maintaining simultaneous transmission capability.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If only one scrambling ID is configured for a UE, then device complexity is reduced, but interference randomization across multiple TRPs is limited

Engineering Contradiction:

Improvescrambling ID configurationVSAvoidinter-TRP interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by assigning different scrambling ID characteristics to different TRPs. The first scrambling ID is specifically associated with the first TRP and the second scrambling ID with the second TRP, creating localized scrambling properties for each TRP's transmission. This allows interference randomization to be applied locally per-TRP while maintaining overall system coordination.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If multiple scrambling IDs are configured for different TRPs, then interference randomization is improved, but configuration complexity increases

Engineering Contradiction:

Improveinter-TRP interferenceVSAvoidscrambling ID configuration

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-configuring the association between TRPs and scrambling IDs through higher layer signaling before actual data transmission. The network side configures the first scrambling ID and second scrambling ID and their associations with respective TRPs in advance, so that when multiple TRPs transmit simultaneously, the UE can immediately apply the appropriate scrambling sequence without real-time decision complexity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4008115B1Multiple scrambling identities configuration

Publication Date: 2024.11.13 LENOVO (BEIJING) LTD

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AI summary

Methods and apparatuses for configuring multiple scrambling IDs for DL transmissions from multiple TRPs are disclosed. A method comprises grouping CORESETs into two or more CORESET groups, each CORESET group includes one or more CORESETs; and configuring the same number as the number of the CORESET groups of scrambling IDs associated with two or more CORESET groups.