MBMS Control Information Transmission in Multicarrier Aggregation

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Solution Overview

Problem

In multicarrier aggregation systems, UEs operating on non-MBMS-including Component Carriers (CCs) cannot timely and accurately learn about the initiation of MBMS sessions on MBMS-including CCs, leading to premature gathering and increased conflicts in uplink random access, degrading system performance.

Innovation Solution

The network side determines an MBMS-including CC and a non-MBMS-including CC, sending service control information and service data on the MBMS-including CC while transmitting related control information, such as Multicast Control Channel (MCCH) information, on the non-MBMS-including CC, allowing UEs to determine whether to receive the MBMS based on received control information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If MBMS is sent using only one CC to simplify standardized workload, then standardization complexity is reduced, but UEs on non-MBMS-including CCs cannot timely discover MBMS sessions, causing premature gathering and increased uplink random access conflicts

Engineering Contradiction:

Improvestandardization complexityVSAvoidMBMS session information

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The patent segments MBMS control information transmission across multiple CCs: the MBMS-including CC transmits service control information and service data, while non-MBMS-including CCs transmit related control information (MCCH). This segmentation allows UEs on different CCs to access MBMS session information appropriately, resolving the contradiction between simplified standardization and timely information delivery.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism where non-MBMS-including CCs transmit related control information (MCCH) about MBMS sessions. This intermediary allows UEs on non-MBMS-including CCs to discover MBMS sessions timely without requiring all CCs to carry full MBMS service data, thus maintaining standardization simplicity while improving information accessibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If UEs gather to MBMS-including CC upon receiving notification, then MBMS service reception is enabled, but uplink random access conflicts increase due to premature gathering

Engineering Contradiction:

ImproveMBMS service receptionVSAvoiduplink random access

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent implements preliminary action by having non-MBMS-including CCs transmit related control information (MCCH) in advance, containing MBMS session initiation notifications. This allows UEs to be notified of upcoming MBMS sessions before the actual service starts, enabling them to prepare and gather at the appropriate time rather than prematurely, thus reducing uplink random access conflicts while ensuring timely service reception.

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If MBMS control information is transmitted only on MBMS-including CC, then transmission resources are optimized, but UEs on non-MBMS-including CCs cannot accurately and timely learn about MBMS sessions

Engineering Contradiction:

Improvetransmission resourcesVSAvoidMBMS session discovery accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent applies local quality by differentiating the transmission content on different CCs: MBMS-including CCs transmit complete service control information and service data, while non-MBMS-including CCs transmit related control information (MCCH) with MBMS session notifications. This localized differentiation ensures each CC transmits only the information relevant to UEs on that CC, optimizing transmission resources while ensuring accurate and timely MBMS session discovery for all UEs.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9173194B2Method and system for transmitting MBMS control information in multicarrier aggregation system

Publication Date: 2015.10.27 ZTE CORP

AI summary

A method and system for transmitting Multimedia Broadcast Multicast Service (MBMS) control information in a multicarrier aggregation system are disclosed in embodiments of the disclosure. The method includes that: when an MBMS needs to be sent, a network side determines an MBMS-including Component Carrier (CC) and a non-MBMS-including CC, and sends service control information and service data of the MBMS in the MBMS-including CC. The method further includes that: the network side sends, in the non-MBMS-including CC, related control information of the MBMS in the MBMS-including CC. With technical solutions provided by the embodiments of the disclosure, a UE operating or residing in a non-MBMS-including CC can find out timely and accurately the initiation of a session for a UE-interested MBMS in an MBMS-including CC, so as to avoid premature blind gathering of UEs in the MBMS-including CC, thus effectively decreasing duration of impact on uplink random access by the MBMS-including CC.