Random Access Timing Advance for Staggered Msg3 Transmission
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Solution Overview
Problem
In the random access mechanism, the network device fails to correctly receive messages (Msg3) from terminal devices due to interference, as different devices send their messages at the same time, leading to access failures.
Innovation Solution
The network device sends timing advances to stagger the time windows for message transmission by terminal devices, ensuring minimal overlap or no overlap between these windows, thereby reducing interference and improving access success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device sends random access response messages to multiple terminal devices simultaneously, then the access capacity of the network device is improved, but interference occurs between messages from different terminal devices leading to access failures
Solution Approach 1:
The network device performs preliminary actions by indicating timing advances to terminal devices in advance, before the terminal devices send their messages. This allows terminal devices to pre-calculate and prepare their transmission time windows, ensuring that messages from different devices are staggered in time and do not interfere with each other, thus maintaining both high access capacity and reliable message reception
Solution Approach 2:
The network device changes the timing parameter (timing advance) for different terminal devices. By assigning different timing advance values to different terminal devices, the network device staggers the time windows for message transmission, transforming the transmission timing parameter to eliminate interference while maintaining high access capacity
2Reliability
If the network device staggers the sending time of random access response messages to avoid interference, then the message reception accuracy is improved, but the access capacity of the network device decreases
Solution Approach 1:
The network device performs preliminary actions by indicating timing advances to terminal devices in advance, before the terminal devices send their messages. This allows terminal devices to pre-calculate and prepare their transmission time windows, ensuring that messages from different devices are staggered in time and do not interfere with each other, thus maintaining both high access capacity and reliable message reception
Solution Approach 2:
Terminal devices autonomously calculate their own transmission time windows based on the timing advance values received from the network device. Each terminal device independently adjusts its transmission timing without requiring the network device to sequentially manage each device, enabling parallel processing and maintaining high access capacity while avoiding interference
3Ease of operation
If the terminal device sends messages according to a fixed slot mechanism, then the operation simplicity is maintained, but interference occurs between messages from different terminal devices
Solution Approach 1:
The terminal device changes the timing parameter (timing advance) received from the network device and uses it to calculate its transmission time window. By modifying the fixed slot mechanism with dynamic timing advance values, terminal devices can stagger their transmissions to avoid interference while maintaining operational simplicity through automated calculation
Data Source
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AI summary
This application relates to the field of communication technologies, and provides a communication method and apparatus. In the method, before receiving a random access preamble from a terminal device, a network device sends a random access response message to the terminal device. For different terminal devices, the network device may respectively indicate different timing advances by using different random access response messages, to stagger time at which the different terminal devices send messages (for example, Msg3) to the network device. This reduces mutual interference between the messages sent by the different terminal devices, and reduces a probability that the network device fails to receive the message of the terminal device, to help improve an access success rate of the terminal device.