Extended DRX Cycle Paging for M2M Power Saving
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Solution Overview
Problem
Current paging methods in mobile communication systems are inefficient for M2M/MTC devices operating in High Power Saving Reception Mode (HPSRM), as they do not effectively account for the low-power transmission requirements, leading to potential missed paging messages and unreliable device access.
Innovation Solution
A method and apparatus that involve transmitting and receiving paging messages based on extended Discontinuous Reception (DRX) cycles, where the length of the first DRX cycle is a multiple of the second DRX cycle, allowing M2M/MTC devices to receive paging messages more reliably by adjusting the timing and retransmission parameters according to the N2 value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If M2M/MTC devices operate in HPSRM mode with low-power transmission, then power consumption is reduced and device cost decreases, but paging message reception reliability deteriorates
Solution Approach 1:
The patent implements extended DRX cycles for HPSRM devices, where the device periodically wakes up at predetermined intervals to receive paging messages. This periodic action allows the device to maintain low power consumption by sleeping most of the time while still reliably receiving paging messages at scheduled intervals, resolving the contradiction between power saving and reception reliability.
Solution Approach 2:
The network performs preliminary actions by calculating and determining the specific timing when HPSRM devices will wake up based on their extended DRX cycles. The network prepares and transmits paging messages at these predetermined times, ensuring that devices can receive messages reliably without needing to continuously monitor the channel, thus maintaining power efficiency while improving reliability.
2Use of energy by moving object
If extended DRX cycles are used for HPSRM devices, then power saving is improved, but paging message transmission timing complexity increases
Solution Approach 1:
The patent segments the network into different handling groups: normal devices using standard DRX cycles and HPSRM devices using extended DRX cycles. By segmenting the device population and their corresponding paging procedures, the system can apply simplified timing rules specific to each group, reducing overall complexity while enabling extended power-saving cycles for HPSRM devices.
Solution Approach 2:
The patent changes the DRX cycle parameter for HPSRM devices from the standard value to an extended value. This parameter change is systematically managed by the network, which adjusts timing calculations based on the device's HPSRM status. By formalizing this parameter change, the system manages timing complexity through standardized procedures rather than ad-hoc solutions.
3Device complexity
If standard paging methods are used for HPSRM devices, then system simplicity is maintained, but paging message delivery reliability deteriorates due to wireless errors
Solution Approach 1:
The patent implements a feedback mechanism where the network monitors whether HPSRM devices successfully receive paging messages and adjusts retransmission strategies accordingly. When a paging message is not acknowledged or is received with errors, the network can retransmit the message at the next appropriate DRX wake-up time. This feedback loop improves delivery reliability while maintaining relatively simple system operations.
Solution Approach 2:
The patent prepares for potential wireless errors by implementing beforehand cushioning through multiple retransmission opportunities. The network schedules paging message retransmissions at subsequent DRX wake-up times, ensuring that even if the initial transmission is lost or corrupted due to wireless errors, the message can be delivered reliably without requiring complex real-time error correction mechanisms.
Data Source
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AI summary
A method is provided for communicating with a User Equipment (UE) supporting a High Power Saving Reception Mode (HPSRM) mode by an evolved Node B (eNB) in a wireless communication system. The method includes receiving Discontinuous Reception (DRX) cycle information from a network entity performing mobility management for the UE by the eNB communicating with the UE over a wireless link; and broadcasting system information including the DRX cycle information. The DRX cycle information is set longer than DRX cycle information of a UE non-supporting the HPSRM mode. By doing so, an efficient paging method for an UE operating in the HPSRM mode may be provided.