Orthogonal PRACH Configurations for Dual Connectivity Random Access

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Solution Overview

Problem

In LTE networks, dual connectivity mode wireless communication devices face delays in configuring and activating secondary cells due to simultaneous random access transmissions, which can lead to contention and interference, resulting in unpredictable and prolonged activation times of secondary cells.

Innovation Solution

The method involves determining whether random access channel configurations between primary and secondary cells are orthogonal, allowing for non-overlapping transmission times or frequencies, thereby enabling the wireless communication device to configure secondary cells more efficiently by selecting orthogonal PRACH configurations for dual connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If simultaneous random access transmissions are performed on primary and secondary cells, then dual connectivity configuration can be initiated, but transmission delays and contention occur due to non-orthogonal configurations

Engineering Contradiction:

Improvesecondary cell configuration speedVSAvoidrandom access transmission delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The network node performs preliminary determination of orthogonal random access configurations before initiating dual connectivity configuration. By pre-checking whether PRACH configurations of primary and secondary cells are orthogonal, the system avoids subsequent transmission delays and contention, enabling faster secondary cell activation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the configuration parameters of random access channels by selecting orthogonal PRACH configurations for primary and secondary cells. This parameter selection ensures that random access transmissions on different cells do not overlap in time or frequency, eliminating contention and reducing transmission delays.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If non-orthogonal PRACH configurations are used, then resource utilization is maximized, but contention and interference increase between simultaneous transmissions

Engineering Contradiction:

Improverandom access resource capacityVSAvoidtransmission contention and interference

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The invention applies local quality by making the random access configuration orthogonal specifically for dual connectivity scenarios while allowing non-orthogonal configurations for other cases. The system adaptively selects the appropriate configuration mode based on the operational context, optimizing both resource utilization and interference avoidance.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10278213B2Wireless communication device, a network node and methods therein for improved random access

Publication Date: 2019.04.30 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Embodiments herein relate to a communication device and a method performed by the communication device for enabling improved random access transmissions in a radio communications network. The communication device obtains information indicating a first random access channel configuration and also obtains information indicating at least a second random access channel configuration. Then, the communication device determine whether or not the at least second random access channel configuration is orthogonal to the first random access channel configuration. Furthermore, the communication device uses the result of the determining to determine the time required by the communication device to configure the at least second cell. Embodiments herein also relate to a first network node and a method therein for enabling improved random access transmissions in a radio communications network.