SI Request Feedback via Contention Resolution in 5G NR
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Solution Overview
Problem
In 5G NR systems, User Equipment (UE) faces indeterminate behaviors due to uncertainty about whether System Information (SI) requests sent during a contention-based random access procedure are successfully received by the network.
Innovation Solution
A UE with a wireless transceiver and controller transmits an SI request message and receives a contention resolution message, determining successful reception based on matching content, and indicates acknowledgement to upper layers if the resolution is successful, thus clarifying SI request delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses the contention-based random access procedure to request on-demand SI, then the SI request can be sent to the network, but the UE cannot determine whether the SI request is successfully received by the network side
Solution Approach 1:
The patent implements a feedback mechanism where the network side sends an acknowledgement (ACK) in the Msg4 contention resolution message to confirm successful reception of the SI request. The UE determines successful delivery by checking whether the contention resolution is successful based on receiving this ACK feedback from the network side.
2Productivity
If the UE determines SI request success based on Msg4 reception, then the UE can proceed with the procedure, but indeterminate behaviors occur when contention resolution status is unclear
Solution Approach 1:
The network side provides explicit feedback through the contention resolution message (Msg4) to indicate whether the SI request was successfully received. This feedback mechanism eliminates indeterminate behaviors by giving the UE clear information about the success or failure of the contention resolution and SI request delivery.
Solution Approach 2:
The UE autonomously determines the success of contention resolution by evaluating whether it successfully received the ACK in the Msg4 message. This self-service approach allows the UE to independently assess the status of its SI request without requiring additional explicit confirmation messages, thereby improving procedure efficiency.
Data Source
AI summary
A User Equipment (UE) including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a service network. The controller performs the following during a contention-based random access procedure: transmitting a first message comprising a System Information (SI) request, to the service network via the wireless transceiver; receiving a second message for a contention resolution from the service network via the wireless transceiver in response to transmitting the first message; determining whether the contention resolution is successful according to the second message; and indicating a reception of an acknowledgement for the SI request to an upper layer of a Media Access Control (MAC) layer in response to determining that the contention resolution is successful.