Random Access Modulation Selection for Early Data Transmission
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Solution Overview
Problem
Existing communication technologies face challenges in efficiently utilizing high-order modulation schemes during early data transmission (EDT) for terminals like MTC and NB-IoT devices, as they need to report capabilities in MSG3, which conflicts with data transmission, leading to inefficient data transmission processes.
Innovation Solution
A method and apparatus that enable terminals to use a first and second modulation scheme, including a high-order modulation scheme, allowing for data modulation based on a received random access response, ensuring compatible data transmission with access network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminals use high-order modulation schemes for data transmission, then transmission efficiency is improved, but capability reporting in MSG3 conflicts with data transmission
Solution Approach 1:
The patent applies preliminary action by pre-configuring modulation scheme indication information in the random access response (MSG2) before data transmission occurs. The access network device determines and indicates the modulation scheme in advance, allowing the terminal to directly use the indicated scheme for MSG3 data transmission without needing to report capabilities or negotiate during the data transmission phase, thus avoiding the conflict between capability reporting and data transmission.
2Reliability
If terminals report capabilities in MSG3, then modulation scheme compatibility is ensured, but data transmission time is consumed
Solution Approach 1:
The patent moves the modulation scheme determination and indication to an earlier stage (in MSG2/random access response) before MSG3 data transmission. This preliminary action ensures compatibility is established in advance, eliminating the need for capability reporting in MSG3 and freeing up the entire MSG3 payload for actual data transmission, thus reducing time loss.
3Productivity
If high-order modulation schemes are used, then data transmission rate is increased, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically selecting the modulation scheme order based on terminal capability and channel conditions. The access network device determines an appropriate modulation scheme (from multiple options including high-order schemes) and indicates it to the terminal. This allows the system to use high-order modulation (e.g., 64QAM, 256QAM) when conditions permit to increase data rate, while falling back to lower-order modulation when power consumption needs to be reduced, thus optimizing the trade-off between transmission rate and power consumption.
Data Source
AI summary
A data transmission method includes that a transmitter sends a random access request by using a first random access resource. The transmitter supports a first modulation scheme and a second modulation scheme, the second modulation scheme includes a high-order modulation scheme whose modulation order is higher than the modulation order of the first modulation scheme, and the first random access resource is configured to the transmitter supporting the second modulation scheme. The method further includes that the transmitter performs a data modulation in accordance with a target modulation scheme. The modulation is performed under a direction of a received random access response, and the target modulation scheme is one of the first modulation scheme and the second modulation scheme.