TX UE Sidelink DRX Timer Management

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently managing sidelink discontinuous reception (DRX) operations in wireless communication systems, particularly in maintaining optimal resource allocation and reducing power consumption while ensuring reliable and low-latency communications for V2X scenarios.

Innovation Solution

A method and apparatus for a transmitter (TX) user equipment (UE) to perform sidelink (SL) DRX operations based on a radio resource control (RRC) related timer, receiving configurations from a base station, and maintaining SL DRX until the timer expires, allowing for exceptional resource pool selection and reconfiguration during specific events like radio link failure or handover.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If SL DRX operation is implemented to reduce power consumption, then energy efficiency is improved, but resource allocation flexibility deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidresource allocation flexibility

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic resource pool reconfiguration during RRC connection procedures. When an RRC connection is established or reconfigured, the network can dynamically update the SL DRX configuration and resource pool assignments, allowing the system to adapt resource allocation while maintaining DRX power-saving benefits during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the timing parameter of resource pool availability by making exceptional resource pools available during specific RRC timer periods. This parameter change allows the system to provide enhanced resource allocation flexibility precisely when needed (during RRC procedures) without compromising the power-saving DRX operation during steady state.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If SL DRX configuration is maintained strictly to ensure reliable communication, then communication reliability is improved, but adaptability to RRC procedures deteriorates

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidadaptability to RRC procedures

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent prepares exceptional resource pools in advance for potential RRC procedures. These resource pools are pre-configured and made available when specific RRC timers are running, ensuring that reliable communication resources are ready before RRC procedures begin, thus maintaining communication reliability while enabling adaptability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces RRC timers as intermediary mechanisms that mediate between the strict SL DRX configuration and the need for adaptability. The timers act as triggers that temporarily modify resource pool availability, allowing the system to bridge the gap between maintaining reliable DRX operation and adapting to RRC connection procedures.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If exceptional resource pool is provided during RRC timer period, then adaptability to RRC procedures is improved, but system complexity deteriorates

Engineering Contradiction:

Improveadaptability to RRC proceduresVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent makes the existing SL DRX configuration and resource pool mechanisms serve multiple functions: they operate during normal DRX periods for power saving, and they are temporarily enhanced during RRC timer periods for procedure adaptability. This multi-functionality reduces the need for separate complex mechanisms for each operational mode.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies exceptional resource pool availability locally and temporarily, only during specific RRC timer periods when needed. This localized approach means that the enhanced adaptability is applied precisely where and when required, without making the entire system continuously complex, thus limiting the complexity increase to specific time windows.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20230269822A1Method and apparatus for operating TX UE based on RRC related timer for sidelink DRX in wireless communication system

Publication Date: 2023.08.24 LG ELECTRONICS INC

AI summary

Performing a radio resource control (RRC) related operation by a transmitter (TX) user equipment (UE) performing a sidelink (SL) discontinuous reception (DRX) operation in a wireless communication system. A method may include: receiving, by the TX UE, an SL DRX configuration from a base station; receiving, by the TX UE, a configured grant from the base station; performing, by the TX UE, SL transmission on a resource related to the configured grant during an active time based on the SL DRX configuration; performing, by the TX UE, an RRC connection related procedure to a network; and starting, by the TX UE, a timer for the RRC connection related procedure. The TX UE may perform transmission in an exceptional pool of the configured grant based on the SL DRX configuration after starting the timer. The SL DRX configuration may be maintained until expiration of the timer.