Mobile Terminal Contention-Based Channel Resource Derivation

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Solution Overview

Problem

The increased downlink control signaling in wireless communication systems, particularly in Release 8 of the 3GPP standards, leads to delays in broadcasting system information, causing mobile terminals to experience longer periods without crucial system updates, uplink data transmission delays, and reduced performance in wireless communication systems.

Innovation Solution

A method where the base station encodes system information to indicate available resources of a contention-based channel relative to other resources, allowing mobile terminals to derive additional resources and transmit access requests, thereby reducing the amount of data signaled and minimizing delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station broadcasts system information indicating all available contention-based channel resources, then mobile terminals can access the system, but the downlink control signaling increases causing delays in system information transmission

Engineering Contradiction:

Improvesystem information transmissionVSAvoidsystem information transmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent extracts only the essential first available resource information from the complete resource set and broadcasts it via system information. The mobile terminal then derives the remaining resources locally using a predetermined rule, eliminating the need to broadcast all resource details and reducing downlink control signaling overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The mobile terminal performs self-service by locally deriving additional contention-based channel resources from the first available resource using a predetermined rule. This reduces the burden on the base station to broadcast all resource information, thereby reducing downlink control signaling and transmission delays.

Inventive Principle:

Principle #25Self-service

2Loss of information

If the base station broadcasts complete system information about contention-based channel resources, then mobile terminals can derive additional resources, but the increased signaling delays crucial system information updates

Engineering Contradiction:

Improvesystem information completenessVSAvoidinformation update delay

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent establishes a predetermined rule in advance that defines how mobile terminals will derive additional resources from the first available resource. This preliminary arrangement ensures that complete resource information can be reconstructed at the terminal side without requiring complete broadcasting, thus reducing signaling delays.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If Release 8 allocates common E-DCH resources for contention-based access in CELL_FACH state, then mobile terminals can transmit uplink data without state transition delay, but the downlink control signaling increases

Engineering Contradiction:

Improveuplink data transmission efficiencyVSAvoiddownlink control signaling delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent extracts only the essential first available E-DCH resource information and broadcasts it via system information. Mobile terminals derive additional E-DCH resources locally using a predetermined rule, reducing the downlink control signaling overhead while maintaining the ability to access common E-DCH resources in CELL_FACH state for efficient uplink transmission.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Mobile terminals perform self-service by locally deriving additional E-DCH resources from the broadcasted first available resource using a predetermined rule. This reduces the burden on downlink control signaling while enabling terminals to access multiple E-DCH resources for efficient uplink data transmission without state transitions.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9820301B2Mobile terminal, base station and methods therein

Publication Date: 2017.11.14 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Embodiments herein relate to a method in a mobile terminal for requesting access to a wireless communication system. The mobile terminal receives broadcasted system information that indicates a first available resource of a contention based channel. The mobile terminal derives a second available resource of the contention based channel based on the first available resource of the contention based channel. The mobile terminal further transmits an access request preamble mapped to the second available resource to access the wireless communication system.