Random Access Message 3 Transmission Using Multiple Uplink Grants
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Solution Overview
Problem
Existing methods for enhancing message 3 transmission in New Radio (NR) random access procedures, such as increasing transmission occasions and providing multiple uplink grants, do not effectively address how to process these grants when contention resolution is unsuccessful.
Innovation Solution
A method and apparatus for terminal equipment and network devices to utilize multiple uplink grants for initial and retransmission of message 3, with priority handling and HARQ process ID management to ensure transmission success and efficient grant utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple uplink grants are provided in random access response to enhance message 3 transmission opportunities, then transmission reliability is improved, but grant processing complexity and resource waste increase when contention resolution fails
Solution Approach 1:
The terminal equipment determines whether to transmit message 3 before actually transmitting it, based on whether uplink resources are available. This preliminary check prevents unnecessary transmissions and avoids the complexity of processing multiple grants when contention resolution will fail, while still maintaining transmission reliability when resources are available
Solution Approach 2:
The patent provides multiple uplink grants to the terminal equipment in the random access response, giving it more transmission opportunities than traditionally single grant. However, the terminal only processes and transmits on grants where uplink resources are actually available, avoiding the waste of processing all grants when resources are insufficient
2Reliability
If multiple uplink grants are provided for message 3 transmission, then transmission occasions are increased, but energy consumption and resource waste increase when grants cannot be utilized
Solution Approach 1:
The terminal equipment performs a preliminary determination of uplink resource availability before transmitting message 3. This early check ensures that energy is only consumed for grants that will actually be used, preventing waste from processing and attempting transmissions on grants without available resources
Solution Approach 2:
The terminal equipment autonomously determines which grants to process based on its own uplink resource status without requiring additional network coordination. This self-service approach reduces unnecessary energy consumption by independently filtering out unusable grants before processing
Data Source
AI summary
A signal transmission method and apparatus and a communication system. The signal transmission method includes: a terminal equipment receives a random access response, the random access response being associated with multiple uplink grants; and the terminal equipment transmits a message 3 by using one or more uplink grants in the multiple uplink grants; wherein at least one uplink grant in the one or more uplink grants is used to transmit initial transmission of the message 3. With this application, terminal equipment may procedure multiple uplink grants provided by a network device.