M2M Data Transmission Resource Allocation via Preamble Mapping
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Solution Overview
Problem
In M2M data transmission over LTE networks, the high signaling overheads relative to small data packet sizes result in resource wastage, particularly during the random access process, as the same signaling overheads are required for both small M2M data packets and larger SMS messages, leading to inefficient resource utilization.
Innovation Solution
The method involves user equipment (UE) selecting and acquiring uplink and downlink time-frequency resources corresponding to a preamble sequence, allowing for direct data transmission after successful decoding and synchronization, without relying on signaling from the base station, thereby reducing redundant signaling and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traditional random access process is used for M2M data transmission, then the data can be transmitted reliably with proper acknowledgment, but the signaling overheads become excessively large relative to the small data packet size, causing resource wastage
Solution Approach 1:
The patent segments the traditional random access process by allowing UE to skip certain signaling steps (RAR reception, contention resolution) when transmitting small data packets. The procedure is divided into a simplified path for small data and a complete path for larger data, enabling selective optimization based on data size requirements.
Solution Approach 2:
The patent applies partial action by implementing only the essential components of the random access process needed for small data transmission. Instead of executing the full four-step procedure, the system performs just enough signaling to establish the uplink grant and transmit the data, omitting redundant acknowledgment and resolution steps that would be excessive for small packets.
2Ease of operation
If the base station sends detailed resource allocation signaling for each random access response, then the UE can accurately acquire time-frequency resources, but the signaling overhead increases significantly for small data packets
Solution Approach 1:
The patent applies preliminary action by pre-configuring resource pools and mapping relationships between preamble sequences and uplink resources. The UE can directly determine uplink time-frequency resources from the selected preamble sequence without requiring detailed base station signaling, as the mapping is established in advance through system information or pre-configuration.
Solution Approach 2:
The UE performs self-service by autonomously determining its uplink transmission resources based on the preamble sequence it selects and the pre-established mapping rules. This eliminates the need for the base station to provide explicit resource allocation signaling for each random access attempt, allowing the UE to self-configure its transmission parameters.
3Reliability
If the complete random access procedure including conflict resolution is executed, then connection reliability is ensured, but the transmission time increases for small data packets that do not require full connection establishment
Solution Approach 1:
The patent implements dynamics by making the random access procedure adaptive based on data size. The system dynamically selects between a simplified procedure for small data (skipping contention resolution) and a complete procedure for larger data (including full connection establishment). This dynamic adaptation allows the protocol to optimize transmission time for small packets while maintaining reliability for larger transmissions.
Solution Approach 2:
The patent changes the procedural parameters of the random access process based on data characteristics. When data size is below a threshold, the system modifies the access procedure by omitting certain steps (RAR waiting, contention resolution messaging). This parameter change enables faster access for small data while preserving the完整 procedure for larger data that requires full connection management.
Data Source
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AI summary
The present invention relates to the field of communications technologies, and discloses a data transmission method, user equipment, a base station, and a system, which can resolve a problem of a waste of resources during a device-to-device (M2M) data transmission process. The method includes: selecting, by user equipment (UE), a preamble sequence, and acquiring an uplink time-frequency resource and a downlink time-frequency resource that are corresponding to the preamble sequence (101); sending the preamble sequence to a base station, so that the base station decodes the preamble sequence, and determines, according to the decoded preamble sequence, the uplink time-frequency resource and the downlink time-frequency resource that are corresponding to the decoded preamble sequence (102); and if decoding response information sent from the base station is received by using the downlink time-frequency resource, sending a data packet to the base station by using the uplink time-frequency resource, where the decoding response information is used to indicate that the base station successfully decodes the preamble sequence (103). The present invention is mainly applied to the M2M data transmission process.