E-AGCH Channel Segmentation for Mixed TTI Scheduling

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Solution Overview

Problem

In HSUPA networks, the inefficient use of E-AGCH channels due to mixed TTI modes (10 ms and 2 ms) leads to unnecessary delays and wasted bandwidth, as Node B struggles to manage a mixture of UE categories with different TTI capabilities on the same channel, resulting in suboptimal channel resource allocation.

Innovation Solution

The method involves configuring E-AGCH channels into exclusive 10 ms or 2 ms TTI intervals, assigning UE categories to appropriate channels based on their capabilities, and dynamically adjusting the proportion of these intervals to optimize resource utilization, thereby minimizing channelization codes and reducing delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If E-AGCH channels are shared between 10 ms and 2 ms TTI modes, then channel resource utilization is reduced, but device compatibility and scheduling flexibility are improved

Engineering Contradiction:

Improvechannel resource utilizationVSAvoidscheduling flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The E-AGCH channel is segmented into separate logical channels dedicated to specific TTI modes (10 ms TTI channel and 2 ms TTI channel). This segmentation allows each channel to be optimized for its specific TTI mode, eliminating resource conflicts and improving overall channel utilization efficiency while maintaining the ability to serve different UE categories.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If mixed TTI modes are supported on the same channel, then UE category compatibility is improved, but transmission delays increase

Engineering Contradiction:

ImproveUE category compatibilityVSAvoidtransmission delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The channel is divided into separate 10 ms TTI channel and 2 ms TTI channel, allowing UEs to be assigned to the channel matching their capability. This eliminates the delays caused by mixed TTI mode scheduling on the same channel, as each channel operates with its own dedicated timing structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Separate E-AGCH channels are created for different TTI modes, effectively copying the channel structure to serve different UE categories simultaneously. This allows 10 ms TTI UEs and 2 ms TTI UEs to operate independently without interfering with each other's timing and scheduling.

Inventive Principle:

Principle #26Copying

3Productivity

If separate channels are created for different TTI modes, then transmission efficiency is improved, but channel configuration complexity increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidchannel configuration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The base station is designed with multi-functionality to handle both 10 ms TTI and 2 ms TTI channels simultaneously. The E-AGCH configuration mechanism is enhanced to support multiple channel types, allowing the system to create separate channels when needed while maintaining the ability to manage mixed modes, thus improving transmission efficiency without requiring fundamentally different system architectures.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9066302B2TTI channel arrangement and UE to channel assignment

Publication Date: 2015.06.23 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method and apparatus for operating a high speed uplink base station is provided. The base station is adapted to communicate with a first type of user entities and a second type of user entities. The first type of user entities communicate in a first transmission interval and the second type of user entities communicate in a second transmission interval.