Early Data Transmission RACH Configuration for M2M Reliability
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Solution Overview
Problem
Current 3GPP LTE systems face challenges in supporting high reliability for early data transmission, especially for machine-to-machine (M2M) devices in poor radio coverage areas, as normal radio resource control protocols are not configured at the time of transmission, leading to costly retransmissions and inefficient battery usage.
Innovation Solution
The proposed method of high reliability and early data transmission (EDT) allows for one uplink transmission followed by one downlink data transmission during a random-access channel procedure, with different RACH reattempt parameters for varying types of access and the option to fallback to legacy RACH procedures for high reliability, reducing signaling overhead and saving UE power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If normal RRC protocols are used for data transmission, then transmission reliability is improved, but signaling overhead increases and battery consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring RRC protocols and reliability mechanisms before the actual data transmission occurs. The network pre-configures RRC connection parameters, reliability settings, and transmission protocols during idle state, so that when M2M devices need to transmit data, they can immediately use these pre-established configurations without going through full protocol setup procedures, thereby reducing both signaling overhead and battery consumption while maintaining reliability
Solution Approach 2:
The patent extracts the essential reliability mechanisms from the complete RRC protocol stack and implements only the necessary reliability functions during early data transmission. By separating and implementing only the critical reliability components rather than the full protocol suite, the system achieves transmission reliability while minimizing signaling overhead and energy consumption
2Reliability
If retransmissions are performed to achieve high reliability, then transmission reliability is improved, but battery consumption increases and transmission cost increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring reliability parameters and retransmission strategies before transmission attempts. The network provides pre-configured reliability settings including maximum retransmission attempts, backoff parameters, and failure thresholds, enabling M2M devices to optimize retransmission behavior and avoid excessive battery consumption from unnecessary retransmission attempts
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting retransmission parameters based on transmission conditions and device state. The system modifies retransmission counters, backoff times, and reliability thresholds according to signal quality, battery level, and network conditions, allowing optimal balance between reliability achievement and energy conservation
3Reliability
If RRC protocols are configured before transmission, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the RRC protocol configuration into separate, modular components that can be independently managed. Instead of implementing the complete RRC protocol stack, the system segments and implements only the specific reliability-related configurations needed for early data transmission, reducing overall system complexity while maintaining necessary reliability functions
Data Source
AI summary
A method of high reliability and early data transmission (EDT) is proposed. EDT allows one uplink transmission (optionally) followed by one downlink data transmission during a random-access channel (RACH) procedure, which can reduce the signaling overhead and save UE power. To improve reliability, for uplink EDT, there would be different set of RACH reattempt parameters in the UE for different types of access. For downlink EDT, there would be an indication in the paging message to trigger whether the UE would use legacy RACH or not. Further, the configuration for PRACH resource for EDT can be independent to legacy PRACH resource configuration. Under certain conditions, UE can fallback to legacy RACH procedure for high reliability.