UE Multi-TA Capability Reporting via Explicit and Implicit Modes

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Solution Overview

Problem

In the LTE-A R11 system, User Equipment (UE) cannot accurately report its multi-Time Alignment (TA) capability information to the base station, which is necessary for supporting multiple TAs in various scenarios, leading to incomplete capability assessment.

Innovation Solution

The UE sends a capability reporting message to the base station containing multi-TA capability information through either an explicit mode or an implicit mode, allowing the base station to determine the UE's support for multi-TA capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If LTE-A R11 introduces multi-TA scenario to support inter-band CA and intra-band CA with repeater/RRH, then the system's adaptability to different deployment scenarios is improved, but the complexity of TA management increases

Engineering Contradiction:

Improvemulti-TA scenario supportVSAvoidTA management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides the TA management into separate TA groups (PTAG and STAG). Each TA group manages a specific set of component carriers with the same TA value. This segmentation allows the system to handle multiple TAs independently, reducing the complexity of managing all TAs uniformly while supporting diverse deployment scenarios like inter-band CA and intra-band CA with repeater/RRH.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs capability indication in advance during the capability exchange phase between UE and network. The UE indicates its multi-TA capability support before actual carrier aggregation configuration, allowing the network to pre-plan the TA group assignments and avoid complex runtime TA management decisions.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the UE reports multi-TA capability information explicitly, then the base station can accurately determine UE capability, but the signaling overhead increases

Engineering Contradiction:

Improvecapability determination accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent reuses the existing BandCombination information element that is already being exchanged for carrier aggregation configuration. By adding a multi-TA capability indication flag to this existing structure, the patent achieves accurate capability reporting without requiring separate dedicated signaling messages, thus avoiding additional signaling overhead.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If the system supports both single-TA and multi-TA scenarios, then the system's versatility is improved, but the difficulty of detecting and measuring UE capability increases

Engineering Contradiction:

Improvesingle-TA and multi-TA scenario supportVSAvoidUE capability detection

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent introduces a specific parameter (multi-TA capability indication) that changes the operational mode of the system. When this parameter is set to indicate multi-TA support, the network activates multi-TA management procedures; when not set, single-TA procedures are used. This parameter-based approach simplifies capability detection compared to analyzing multiple complex behavioral characteristics.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9516494B2Method and device for reporting capability of UE

Publication Date: 2016.12.06 DATANG MOBILE COMM EQUIP CO LTD

AI summary

A method and device for reporting a capability of UE. A UE receives a capability querying message from a base station, and sends a capability reporting message to the base station. The capability reporting message contains multi-TA capability information of the UE through at least one of an explicit mode and an implicit mode.