Cross Slot Paging Scheduling for 5G UE Power Reduction

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Solution Overview

Problem

In 5G wireless communication systems, existing methods for paging lead to unnecessary power consumption in user equipment (UE) due to the need to receive and buffer physical downlink shared channels (PDSCH) while processing physical downlink control channels (PDCCH), especially when paging messages are scheduled in slots different from the slot of PDCCH reception, or when no paging message is scheduled.

Innovation Solution

Implementing cross slot scheduling for paging, where UE indicates its capability to support cross slot scheduling, and the base station adjusts PDCCH and PDSCH scheduling accordingly, allowing UE to monitor and buffer PDSCH only when necessary, reducing unnecessary power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the base station schedules PDSCH in a different slot from PDCCH reception, then the system can support cross-slot scheduling for paging, but the UE must buffer PDSCH while processing PDCCH which causes unnecessary power consumption

Engineering Contradiction:

Improvecross-slot scheduling capabilityVSAvoidUE power consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts scheduling behavior based on UE capability. The base station determines whether to use cross-slot scheduling by checking UE capability information, and the UE dynamically adjusts its behavior (buffering vs. immediate processing) based on the scheduling type and its own capabilities, optimizing power consumption while maintaining flexibility

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the time parameter relationship between PDCCH and PDSCH based on scheduling configuration. When cross-slot scheduling is enabled, the PDSCH is scheduled in a different slot than the PDCCH reception, allowing the UE to process control information before receiving the actual data, thereby reducing power consumption during the buffering period

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the UE buffers PDSCH while processing PDCCH, then the system maintains simple scheduling, but unnecessary power is consumed when no paging message is scheduled or when same-slot scheduling is used

Engineering Contradiction:

Improvescheduling complexityVSAvoidUE power consumption

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The UE uses feedback from PDCCH processing to determine its action. After receiving and processing the PDCCH, the UE checks whether paging is indicated and whether cross-slot scheduling is configured. Based on this feedback, the UE decides whether to buffer the PDSCH or process it immediately, avoiding unnecessary power consumption while maintaining scheduling simplicity

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the buffering behavior based on real-time conditions. The UE transitions between buffering and immediate processing modes depending on the scheduling type and paging indication, optimizing the balance between system simplicity and power consumption

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If the base station uses traditional paging scheduling, then the system is simple to implement, but it cannot optimize power consumption for UEs with different capabilities

Engineering Contradiction:

Improvesystem implementation simplicityVSAvoidUE power consumption

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The system segments the UE population into different capability groups (UEs that support cross-slot scheduling vs. those that don't). The base station obtains capability information from UEs and applies different scheduling strategies accordingly, allowing simple traditional scheduling for legacy UEs while enabling optimized cross-slot scheduling for capable UEs, thus balancing implementation simplicity with power saving optimization

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240080696A1Method and apparatus for transmitting and receiving paging

Publication Date: 2024.03.07 SAMSUNG ELECTRONICS CO LTD

AI summary

The present application provides a method performed by a user equipment (UE) which supports cross slot scheduling for paging, the method comprising: transmitting, to a first base station, information regarding capability of the UE to support cross slot scheduling for paging; receiving, from a second base station, a message including information indicating that the base station supports cross slot scheduling for paging; monitoring, based on whether supporting cross slot scheduling for paging, a PDCCH addressed to a first RNTI for paging or both the PDCCH addressed to the first RNTI for paging and a PDCCH addressed to a second RNTI for paging; detecting the PDCCH addressed to the first RNTI for paging or the PDCCH addressed to the second RNTI for paging; and receiving and buffering, based on whether supporting cross slot scheduling for paging, a PDSCH while decoding the detected PDCCH.