MBMS Dedicated Cell Paging Channel Optimization

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Solution Overview

Problem

In LTE networks, paging in MBMS dedicated cells is inefficient due to cell boundary updates, signaling overhead, and resource wastage, leading to delays and reduced data rates, especially when responding to emergency calls.

Innovation Solution

Implementing adaptive gap patterns for neighbor cell measurements and tracking area updates, using a single paging channel for MBMS dedicated cells, and broadcasting system information to reduce paging load and delay, allowing WTRUs to autonomously manage switching between MBMS and unicast/mixed cells based on mobility and load conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a WTRU switches to an MBMS dedicated cell from a unicast or mixed cell, then MBMS service reception is enabled, but the WTRU cannot monitor paging for incoming calls and cannot detect Tracking Area boundary changes

Engineering Contradiction:

ImproveMBMS service receptionVSAvoidpaging information and TA boundary detection

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent combines paging channel functionality and TA boundary detection capability into the MBMS dedicated cell structure. The network configures the MBMS dedicated cell to carry paging information for WTRUs receiving MBMS services, and to provide TA boundary detection information, allowing WTRUs to remain in the MBMS dedicated cell while maintaining access to these essential functions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The MBMS dedicated cell is enhanced to serve multiple functions simultaneously: it provides MBMS content delivery, paging message transmission, TA boundary detection, and system information broadcasting. This multi-functionality eliminates the need for WTRUs to switch to separate unicast or mixed cells for these additional services.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of information

If a WTRU transits to a mixed or unicast cell to check for incoming call paging, then paging can be monitored, but MBMS service reception is interrupted and cell switching delay occurs

Engineering Contradiction:

Improvepaging informationVSAvoidcell switching delay and MBMS reception interruption

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The patent merges paging channel functionality into the MBMS dedicated cell, allowing WTRUs to receive both MBMS content and paging messages simultaneously without cell switching. The network configures the MBMS dedicated cell to transmit paging information on its paging channel, eliminating the need for WTRUs to leave the MBMS dedicated cell for paging monitoring.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent enables continuous MBMS service reception while simultaneously monitoring paging by allowing WTRUs to remain camped on the MBMS dedicated cell. The paging channel operates concurrently with MBMS content delivery, ensuring uninterrupted service and eliminating cell switching delays.

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If paging messages are transmitted on all MBMS dedicated cells, then all WTRUs can be reached, but system paging load and resource wastage increase

Engineering Contradiction:

Improvepaging reachabilityVSAvoidsystem paging load and resource consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent implements selective paging transmission where paging messages are sent only to specific MBMS dedicated cells based on the WTRU's location and service subscription. The network determines which MBMS dedicated cells need to transmit paging messages, reducing overall system paging load while ensuring reliable delivery to targeted WTRUs.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of transmitting paging messages to all MBMS dedicated cells, the patent applies partial action by limiting paging transmission to only those cells where WTRUs are actually located or subscribed. This reduces redundant paging transmissions and optimizes resource utilization while maintaining complete paging coverage.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8135419B2Method and apparatus of measurement mechanism and efficient paging and broadcasting scheme implementation in MBMS dedicated cell of LTE systems

Publication Date: 2012.03.13 INTERDIGITAL PATENT HOLDINGS INC

AI summary

A WTRU configured to receive a multicast, a unicast or mixed signal. A multimedia signal may be a Multimedia Broadcast Multicast Signal (MBMS). The WTRU switches between an MBMS and a mixed signal and determines optimal time to switch between the MBMS and mixed signal. The WTRU switches between receiving the MBMS and mixed signal in an adaptive or semi-static pattern. A flat broadcast channel (BCH) structure in an MBMS dedicated cell is provided, eliminating need for a dedicated broadcast channel (D-BCH). An MBMS-dedicated cell uses a single paging channel for both paging-indicators and paging-record-blocks. A system information broadcast indicates flexible resource usage and paging-record-block limits. Tracking area (TA)/cell association is provided for an MBMS-dedicated cell and geographically co-located non-MBMS-dedicated cells. MBMS-dedicated cell system information is broadcast to regulate WTRU operation while receiving MBMS within said cell. Generic Access Profile (GAP) definitions is part of system information.