Early Data Transmission Uplink Grant Evaluation
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Solution Overview
Problem
In early data transmission for user plane solutions, user equipment (UE) resumes radio bearers and restores security contexts before starting data transmission, but if the early data transmission fails due to a small uplink grant, unnecessary procedures are performed, highlighting the importance of determining the optimal time for resuming contexts.
Innovation Solution
A method where the UE initiates early data transmission, receives an uplink grant, and based on it, determines whether to transmit a first message related to the early data transmission, resuming radio bearers only if the uplink grant is sufficient, thereby preventing unnecessary resumptions and suspensions of radio bearers and security contexts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE resumes radio bearers and restores security contexts before starting early data transmission, then the data transmission can be initiated quickly, but unnecessary procedures are performed if the uplink grant is insufficient
Solution Approach 1:
The UE performs radio bearer resumption and security context restoration in advance, before receiving and evaluating the uplink grant. This preliminary action enables faster data transmission initiation when the grant is sufficient, while the patent accepts that unnecessary procedures may occur when the grant is insufficient. The principle trades potential waste of procedures for the benefit of faster transmission startup.
2Loss of energy
If the UE determines whether to transmit the first message based on the uplink grant, then unnecessary procedures are prevented, but the determination process adds complexity to the transmission protocol
Solution Approach 1:
The UE evaluates the uplink grant size as feedback information to determine whether to proceed with early data transmission or fallback to normal random access. This feedback mechanism prevents unnecessary radio bearer resumption and security context restoration when the grant is insufficient, saving energy and avoiding wasted procedures. The patent implements this feedback loop by comparing the grant size against thresholds and making conditional transmission decisions.
3Productivity
If the UE resumes radio bearers after determining to transmit the first message, then transmission resources are optimized, but the procedure becomes more complex compared to immediate resumption
Solution Approach 1:
The patent implements a dynamic procedure where the UE adapts its action based on the uplink grant conditions. If the grant is sufficient, the UE proceeds with early data transmission after resuming radio bearers. If the grant is insufficient, the UE performs fallback to normal random access. This dynamic adaptation optimizes transmission resource efficiency by ensuring radio bearers are only resumed when necessary, while accepting increased procedural complexity compared to static immediate resumption.
Data Source
AI summary
Provided are a method for transmitting a message by a user equipment (UE) in a wireless communication, and an apparatus supporting the same. The method may include: initiating early data transmission; receiving a random access response message including an uplink grant, from a base station (BS); based on the uplink grant, determining whether or not to transmit a first message related to the early data transmission to the BS, in response to the random access response message; and after determining to transmit the first message related to the early data transmission, resuming radio bearers for the early data transmission.