HARQ Process Differentiation for Multi-TRP Wireless Systems

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Solution Overview

Problem

Current wireless communication systems, particularly in LTE and NR technologies, face challenges in efficiently managing hybrid automatic repeat request (HARQ) processes for multi-transmit receive point (TRP) modes, leading to excessive processing resource consumption and inability to distinguish between HARQ processes corresponding to different TRPs, which degrades user equipment (UE) performance.

Innovation Solution

The method involves determining HARQ processes for a multi-TRP mode based on the quantity of component carriers (CCs) and HARQ processes capable by the UE, and differentiating between TRPs using control resource sets (CORESETs) or search spaces associated with decoded downlink control information (DCI), ensuring that the total quantity of HARQ processes does not exceed the UE's capability and allowing identification of data from different TRPs for improved resource management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the quantity of HARQ processes is increased to support multi-TRP modes, then the capability to handle multiple TRPs is improved, but the processing resource consumption of the UE increases

Engineering Contradiction:
Improvecapability to handle multiple TRPsVSAvoidprocessing resource consumption
Core Design Contradiction:
Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent segments HARQ processes into different groups associated with different TRPs. Each TRP is assigned a specific set of HARQ process identifiers, allowing the UE to differentiate and process HARQ processes from different TRPs separately. This segmentation enables efficient resource management by preventing the UE from having to process all HARQ processes simultaneously across all TRPs, thus reducing processing resource consumption while maintaining the capability to handle multiple TRPs.

Inventive Principle:
Principle #1Segmentation

2Device complexity

If HARQ processes from different TRPs are not differentiated, then the system complexity is reduced, but the ability to identify and manage data from specific TRPs deteriorates

Engineering Contradiction:
Improvesystem complexityVSAvoidability to identify data from specific TRPs
Core Design Contradiction:
Device complexityVSLoss of information

Solution Approach 1:

The patent applies local quality by assigning specific properties (TRP identifiers) to different HARQ processes based on their associated TRP. Each HARQ process is tagged with information indicating which TRP it belongs to, allowing the UE to locally identify and manage data from specific TRPs without requiring complex global differentiation mechanisms. This approach maintains relatively simple system architecture while enabling precise identification and management of TRP-specific data.

Inventive Principle:
Principle #3Local quality

3Adaptability or versatility

If the UE is configured with more HARQ processes than its capability, then the multi-TRP mode support is enhanced, but the UE performance deteriorates due to excessive processing

Engineering Contradiction:
Improvemulti-TRP mode supportVSAvoidUE performance
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements dynamic configuration of HARQ processes based on UE capability. The network configures the quantity and distribution of HARQ processes across TRPs according to the specific UE's processing capabilities, rather than using a fixed configuration for all UEs. This dynamic approach allows the system to enhance multi-TRP mode support for capable UEs while preventing performance degradation in UEs with limited processing resources, as each UE receives a configuration matched to its actual capability.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS11044064B2Determining hybrid automatic repeat request (HARQ) processes for multi-transmit receive point (TRP)
Publication Date: 2021.06.22 QUALCOMM INC
  • US11044064B2 patent drawing
  • US11044064B2 patent drawing
  • US11044064B2 patent drawing

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine a control resource set (CORESET) associated with decoded downlink control information (DCI) or a search space associated with the decoded DCI. The user equipment may determine a transmit receive point (TRP) differentiation between TRPs associated with a multi-TRP mode based at least in part on the CORESET associated with the decoded DCI or the search space associated with the decoded DCI. Numerous other aspects are provided.