User Terminal TRP Identification for UE-Group Common Signaling
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Solution Overview
Problem
In next-generation mobile communication systems like New Radio (NR), multiple Transmission/Reception Points (TRPs) are not adequately considered, leading to challenges in controlling common signaling for groups of user terminals, particularly when TRPs have the same cell IDs, resulting in difficulties in determining which TRP a specific signaling instruction is intended for.
Innovation Solution
A user terminal is equipped with a receiving section to decode downlink control information common to multiple TRPs and a control section that determines the target TRP for applying this information, using specific formats like DCI format 2_1, which includes pre-emption indications and TPC commands, and employs higher-layer parameters and RNTIs to differentiate between TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TRPs with the same cell ID are used to perform DL transmission, then the system capacity and coverage are improved, but it becomes difficult to determine which TRP a specific signaling instruction is intended for
Solution Approach 1:
The patent segments the downlink control information by introducing TRP-specific identifiers (such as TRP ID or gNB ID) that divide the previously unified signaling space into distinct TRP-specific channels. This allows the UE to identify which specific TRP the signaling is intended for, resolving the ambiguity caused by multiple TRPs sharing the same cell ID.
Solution Approach 2:
The patent introduces an intermediary element (TRP identifier) that mediates between the multiple TRPs and the UE. This identifier acts as a unique marker that allows the UE to distinguish signals from different TRPs even when they transmit on the same cell ID, thereby preventing information loss in target identification.
2Productivity
If multiple TRPs transmit downlink shared channels, then the data rate and reliability are improved, but the complexity of controlling common signaling increases
Solution Approach 1:
The patent applies local quality by making the downlink control information TRP-specific rather than universally common. Each TRP's control information is locally differentiated using TRP identifiers, allowing the system to maintain high data rates through multiple TRPs while managing signaling complexity through localized differentiation.
Solution Approach 2:
The patent adds another dimension to the signaling structure by introducing TRP identifiers as an additional layer of differentiation. This dimensional expansion allows the system to handle multiple TRPs simultaneously without increasing the base signaling complexity, as the identification occurs in a new dimension (TRP-specific tagging) rather than requiring complex coordination protocols.
Data Source
AI summary
One aspect of a user terminal according to the present invention includes: a receiving section that receives downlink control information that is common between groups including one or more user terminals from at least one of a plurality of Transmission/Reception Points (TRPs) that transmit downlink shared channels; and a control section that determines a TRP that becomes an application target of the downlink control information. Consequently, it is possible to appropriately perform a UE-group common signalling even when multiple TRPs are used.