UE Contention Resolution Judgment via C-RNTI Matching
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Solution Overview
Problem
In LTE systems, UE struggles to timely judge contention resolution during random access procedures, leading to delayed reinitiation and potential uplink data sending errors due to incorrect processing of DL Assignments or UL Grants masked with temporary C-RNTIs.
Innovation Solution
A method and system where the UE sends a contention resolution request message carrying a C-RNTI or CCCH SDU, and upon receiving a network side message masked with a temporary C-RNTI, it judges the contention resolution status based on the C-RNTI, CCCH SDU, and signaling type, performing backoff if necessary before the CRT expires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE waits for the CRT to expire before judging contention resolution failure, then the UE ensures accurate contention resolution judgment, but the random access reinitiation is delayed
Solution Approach 1:
The UE performs preliminary judgment of contention resolution failure by detecting whether the received message is addressed to itself (using C-RNTI or CCCH SDU matching) before the CRT expires. This preliminary action allows early detection of failure conditions without waiting for the full timer duration, thus reducing delay while maintaining judgment accuracy.
Solution Approach 2:
The UE uses feedback from the received message (checking if the message is masked with its C-RNTI or contains its CCCH SDU) to determine contention resolution status. This feedback mechanism enables the UE to make accurate judgments based on actual network responses rather than simply waiting for timer expiration.
2Loss of time
If the UE processes DL Assignment or UL Grant masked with T C-RNTI during wait time, then the UE reduces judgment delay, but the UE may process incorrect information leading to uplink data sending errors
Solution Approach 1:
The UE performs a preliminary check to verify whether the received message is intended for itself by checking if the message is masked with its C-RNTI or contains its CCCH SDU. Only after this preliminary verification does the UE proceed to process the message content, ensuring that no incorrect information is processed while still enabling timely judgment.
Solution Approach 2:
The C-RNTI and CCCH SDU act as intermediaries that the UE uses to verify message ownership before processing. This intermediary verification layer ensures that the UE only processes information destined for it, preventing uplink data sending errors while allowing early message processing.
Data Source
AI summary
Embodiments of the present invention disclose a method, device, and system for judging a random contention resolution. The method includes: sending a contention resolution request message to a network side, where the contention resolution request message carries a cell radio network temporary identifier (C-RNTI) or a common control channel serving data unit (CCCH SDU); and when receiving a network side message masked with a temporary C-RNTI (T C-RNTI) allocated by the network side to the UE before a CRT expires, performing backoff if judging, according to the C-RNTI or CCCH SDU and the signaling type of the network side message, that contention resolution fails.