Initial Cell Access Mapping for Sleeping Cell Wake-Up Decisions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power consumption and latency when dealing with sleeping cells in radio access networks, particularly in determining when to wake up a sleeping cell for uplink data transmission.
Innovation Solution
A terminal device employs an initial access configuration that maps traffic types with sleep states to determine whether to transmit a wake-up signal to a sleeping cell or a camped cell for data transmission, based on traffic type and sleep state considerations, including latency requirements and signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sleeping cell is woken up for uplink data transmission, then data transmission capability is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by mapping different traffic types to different sleep states and wake-up conditions. The access node configures the terminal with specific parameters including traffic type identifiers, sleep state indicators, and wake-up signal conditions. When uplink data arrives, the system evaluates these parameters to determine whether to wake up the sleeping cell or use the camped cell, thereby dynamically adjusting the operational state based on traffic characteristics to optimize the balance between data transmission capability and power consumption.
2Loss of time
If a sleeping cell is woken up quickly, then latency is reduced, but power consumption increases
Solution Approach 1:
The patent implements dynamics by introducing multiple sleep states with different wake-up delays and associating them with different traffic types. The system can dynamically select between a first sleep state with shorter wake-up delay for latency-sensitive traffic and a second sleep state with longer wake-up delay for non-critical traffic. This dynamic adaptation allows the system to optimize the trade-off between latency and power consumption based on real-time traffic requirements.
3Reliability
If the terminal always uses the camped cell for transmission, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies self-service by enabling the terminal to autonomously determine the appropriate cell for transmission based on pre-configured parameters. The terminal evaluates the traffic type, checks the sleep state of the second cell, and decides whether to wake up the sleeping cell or use the camped cell without continuous network intervention. This self-service mechanism reduces unnecessary wake-ups of sleeping cells while maintaining reliable transmission by falling back to the camped cell when appropriate, thereby optimizing power consumption while preserving transmission reliability.
Data Source
AI summary
This document discloses a solution for selecting a cell for initial access. According to an aspect, a method comprises: camping in a first cell and detecting a second cell that is in a sleep state; acquiring an initial access configuration mapping traffic types with sleep states and with a cell for initial access; acquiring data for uplink transmission; if a traffic type of the data is a first traffic type and the sleep state of the second cell is a first sleep state, transmitting a wake-up signal to the second cell, transmitting an initial access message to the second cell, and transmitting the data via the second cell; if the traffic type of the data is a second traffic type different from the first traffic type and if the sleep state of the second cell is a second sleep state, transmitting a wake-up signal to the second cell, transmitting an initial access message to the second cell, and transmitting the data via the second cell; and under another condition defined in the initial access configuration and based on the traffic type and the sleep state of the second cell, transmitting an initial access message to the first cell and transmitting the data via the first cell.