Base Station Early Data Transmission Random Access

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Solution Overview

Problem

Conventional random access procedures in cellular communication systems, such as NB-IoT, consume more power and time due to repetition technology, leading to lower data transmission efficiency and resource utilization rates.

Innovation Solution

Implementing early-data transmission (EDT) in base stations and user equipment, where a processor generates an EDT indication and transmits a paging message with a contention-free or contention-based resource, allowing for early downlink data transmission during the random access procedure, thereby reducing the need for subsequent messages and optimizing resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If repetition technology is used to increase transmission coverage in NB-IoT random access procedure, then transmission coverage is improved, but power consumption and time consumption increase, leading to lower data transmission efficiency

Engineering Contradiction:

Improvetransmission coverageVSAvoiddata transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by enabling the base station to transmit downlink data to the user equipment during the random access procedure itself, before the RRC connection is fully established. This allows data to be delivered in advance (early-data transmission), reducing the need for subsequent data transmission messages and improving overall transmission efficiency while maintaining coverage through the existing repetition mechanism.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent merges the random access procedure with downlink data transmission by allowing the base station to carry data messages within the random access response messages. This combination reduces the number of separate transmission steps needed, thereby improving data transmission efficiency without compromising transmission coverage.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If repetition technology is used to increase transmission coverage in NB-IoT random access procedure, then transmission coverage is improved, but time consumption increases

Engineering Contradiction:

Improvetransmission coverageVSAvoidtime consumption

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements preliminary action by delivering downlink data during the random access procedure itself, before the complete RRC connection setup is finished. This early-data transmission approach reduces the total time required for data delivery while maintaining transmission coverage through the established repetition technology.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies skipping by allowing data transmission to occur during the random access phase, effectively rushing through the data delivery process before the full connection setup is complete. This reduces the overall time consumption by overlapping data transmission with the connection establishment procedure.

Inventive Principle:

Principle #21Skipping (Rushing through)

3Reliability

If conventional random access procedure is completed before data transmission, then connection reliability is improved, but signaling overhead increases and resource utilization decreases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges connection establishment and data transmission by allowing the base station to send downlink data within the random access response messages during the random access procedure. This reduces signaling overhead by combining multiple functions into fewer messages while maintaining connection reliability through the established procedures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies preliminary action by performing data transmission during the random access procedure itself, before the RRC connection is fully established. This reduces the number of subsequent signaling messages needed, thereby reducing overall signaling overhead while maintaining connection reliability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11678378B2Base station and user equipment for early-data transmission in a random access procedure

Publication Date: 2023.06.13 INSTITUTE FOR INFORMATION INDUSTRY

AI summary

A base station transmits a paging message carrying a contention-free early-data transmission indication to a user equipment, and transmits a random access response message carrying early downlink data to the user equipment in response to a random access request message transmitted by the user equipment in a random access procedure. A base station transmits a paging message carrying a contention-based early-data transmission indication to the user equipment, and transmits an RRC response message carrying early downlink data to the user equipment in response to an RRC request message transmitted by the user equipment in a random access procedure. In a random access procedure, user equipment generates and transmits a scheduling request message to a base station after receiving early downlink data transmitted by the base station, and transmits uplink data corresponding to the early downlink data to the base station according to an uplink grant transmitted by the base station.