Uplink Resource Allocation in LTE Wireless Systems

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Solution Overview

Problem

In wireless communication systems, dynamic resource allocation in LTE networks leads to delays when insufficient radio resources are allocated, causing the User Equipment (UE) to wait for uplink resource allocation, which slows down communication between the UE and the Evolved Universal Terrestrial Radio Access Network (E-UTRAN).

Innovation Solution

The E-UTRAN allocates an uplink resource in response to an acknowledgement signal or a scheduling request from the UE, allowing for immediate data transmission and reducing delays in retransmissions by preemptively allocating resources upon receiving a Hybrid Automatic Repeat Request (HARQ) acknowledgement or a Buffer Status Report.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If dynamic resource allocation is used to save radio resources, then resource utilization efficiency is improved, but transmission delay increases due to waiting for uplink resource allocation

Engineering Contradiction:

Improveradio resource utilization efficiencyVSAvoidtransmission delay

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The patent applies preliminary action by having the UE send a scheduling request ahead of time when data needs to be transmitted. The E-UTRAN receives this request and proactively allocates uplink resources before the UE actually needs to transmit, eliminating the waiting delay while maintaining efficient resource allocation. This pre-emptive resource allocation resolves the contradiction between saving resources and reducing delay.

Inventive Principle:

Principle #10Preliminary action

2Loss of energy

If uplink resources are allocated only when needed, then resource efficiency is improved, but communication speed decreases due to allocation waiting time

Engineering Contradiction:

Improveradio resource efficiencyVSAvoidcommunication speed

Core Design Contradiction:

Loss of energyVSSpeed

Solution Approach 1:

The patent implements feedback through the scheduling request mechanism. When the UE has data to transmit, it sends a scheduling request to the E-UTRAN, providing real-time feedback about its transmission needs. The E-UTRAN uses this feedback to allocate resources promptly, balancing resource efficiency with communication speed by allocating resources based on actual demand signals from the UE.

Inventive Principle:

Principle #23Feedback

3Reliability

If resource allocation follows standard polling procedures, then protocol compliance is maintained, but delay increases due to multiple signaling exchanges

Engineering Contradiction:

Improveprotocol complianceVSAvoidsignaling delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by sending the scheduling request in advance, allowing the E-UTRAN to prepare and allocate resources before the actual data transmission is needed. This pre-allocation reduces the number of signaling exchanges required during actual transmission while maintaining protocol compliance, thereby reducing delay without sacrificing reliability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8897252B2Method for transmitting data in a wireless communication system and system thereof

Publication Date: 2014.11.25 HTC CORP

AI summary

A method for transmitting data in a wireless communication system including a User Equipment (UE) and a radio access network (RAN) includes the following steps. Firstly, the RAN transmits a MAC protocol data unit (PDU) to the UE. Afterwards, the UE returns an acknowledgement signal in response to the MAC PDU. When the RAN receives the acknowledgement signal, it allocates an uplink resource for the UE to transmit data.