RACH Parameter Broadcast for Dynamic Bit Rate Allocation

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Solution Overview

Problem

Current wireless communication systems, particularly in 3GPP Release 99, face limitations in data rates for the random access channel (RACH) and dedicated channel setup times, making them unsuitable for large packet calls and incurring significant delays, with no enhancements proposed post Release 99. Additionally, the bit rate allocation on RACH is fixed and burdensome, and RRC signaling can cause state changes in the CELL_DCH.

Innovation Solution

The method involves determining an initial bit rate and automatic repeat request (ARQ) profile using parameters received from a broadcast channel to optimize RACH transmissions, allowing for dynamic bit rate allocation and avoiding the need for user-specific signaling, thereby enhancing uplink RACH capabilities and reducing setup times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If RRC signaling is used to change bit rate on RACH, then bit rate can be adjusted, but the process becomes burdensome and may cause state changes in CELL_DCH

Engineering Contradiction:

Improvebit rate adjustment capabilityVSAvoidsignaling complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the bit rate adjustment function from RRC signaling and implements it through broadcast channel parameters. The network broadcasts RACH parameters including bit rate information and ARQ profiles, allowing UEs to adjust bit rates without complex RRC signaling procedures, thus reducing signaling complexity while maintaining adaptability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The broadcast channel serves multiple functions: it provides system information, RACH parameters, and ARQ profiles simultaneously. This multi-functional approach eliminates the need for separate RRC signaling procedures for bit rate adjustment, reducing overall system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of manufacture

If fixed bit rate allocation is used on RACH, then implementation is simple, but data transfer efficiency is limited

Engineering Contradiction:

Improveimplementation simplicityVSAvoiddata transfer efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent transforms the fixed bit rate allocation into a dynamic system where the network can broadcast different RACH parameters and ARQ profiles based on current network conditions and UE requirements. This allows the bit rate to be adjusted dynamically without changing the fundamental simple structure of the RACH, thus improving data transfer efficiency while maintaining implementation simplicity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of bit rate from fixed to variable by introducing broadcastable RACH parameters. The network can modify these parameters based on traffic conditions, allowing the system to adapt bit rates dynamically while keeping the implementation structure relatively simple

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If traditional RACH is used, then setup procedure is simple, but dedicated channel setup times are substantial and delays are considerable

Engineering Contradiction:

Improvesetup procedure complexityVSAvoidchannel setup time

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring ARQ profiles and bit rate parameters in the broadcast channel before the actual data transmission begins. The UE receives these parameters during the random access procedure and can start data transmission more quickly without waiting for complex RRC setup procedures, thus reducing channel setup time while keeping the procedure relatively simple

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The broadcast channel acts as an intermediary that carries RACH parameters and ARQ profiles between the network and UE. This intermediary mechanism allows for faster parameter delivery compared to traditional RRC signaling, reducing the time needed for dedicated channel setup while maintaining procedural simplicity

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8989082B2Apparatus, methods, computer program products and systems providing RACH parameters in a broadcast channel for a random access procedure

Publication Date: 2015.03.24 NOKIA TECHNOLOGIES OY

AI summary

In one non-limiting, exemplary embodiment, a method includes: receiving at least one parameter from a broadcast channel (51); determining, using the received at least one parameter, information including at least one of an initial bit rate to use when transmitting on a random access channel (RACH) and an automatic repeat request (ARQ) profile to use when transmitting on the RACH (52); and transmitting a message on the RACH in accordance with the determined information (53).