C-RNTI Re-synchronization in Wireless Random Access
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Solution Overview
Problem
In wireless communication systems, there is a challenge in ensuring that user equipment (UE) identifiers are correctly synchronized across cells, particularly when UEs transition between base stations or perform random access, as existing methods may lead to unnecessary changes or inefficiencies in Cell Radio Network Temporary Identifier (C-RNTI) management.
Innovation Solution
The method involves sending a random access preamble and receiving a random access response that includes a temporary C-RNTI, with the UE either using this temporary ID if it does not already have a valid one or continuing to use its existing valid C-RNTI, thereby simplifying the re-synchronization process and avoiding unnecessary ID changes during handovers or state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE always uses a temporary C-RNTI received during random access, then the random access procedure is simplified, but the UE cannot maintain communication continuity when it already has a valid C-RNTI
Solution Approach 1:
The patent implements dynamic C-RNTI selection where the UE adapts its behavior based on its current state: if the UE already has a valid C-RNTI, it continues using that C-RNTI for uplink transmissions; if the UE does not have a valid C-RNTI, it uses the temporary C-RNTI received during random access. This dynamic approach resolves the contradiction by allowing the system to optimize for either procedural simplicity or communication continuity depending on the UE's state.
2Reliability
If the UE sends the temporary C-RNTI in every uplink message, then the base station can always identify the UE, but unnecessary ID transmissions increase signaling overhead
Solution Approach 1:
The patent extracts the C-RNTI transmission requirement from being a mandatory element in every uplink message and makes it conditional. The UE only includes the C-RNTI in uplink messages when it does not already have a valid C-RNTI or when specifically required by the random access procedure. This extraction principle reduces signaling overhead while maintaining reliable UE identification by removing unnecessary redundant transmissions.
3Adaptability or versatility
If the UE transitions between base stations and always requests new C-RNTI, then each base station can independently manage identifiers, but handover efficiency decreases due to unnecessary re-synchronization
Solution Approach 1:
The patent applies preliminary action by having the UE maintain its valid C-RNTI across base station transitions without requesting a new one during handover. The UE continues using the existing C-RNTI unless the target base station explicitly requires re-synchronization. This preliminary maintenance of the C-RNTI avoids unnecessary re-synchronization procedures and accelerates handover efficiency while base stations retain independent management capabilities through their ability to request C-RNTI re-assignment when needed.
Data Source
AI summary
Methods and apparatuses for re-synchronizing Cell Radio Network Temporary Identifiers (C-RNTIs) in a wireless communication system are disclosed. In an aspect, a random access preamble is sent for random access by a user equipment (UE) and a random access response (RAR) is received that includes a temporary C-RNTI. If the UE already has a valid C-RNTI, a message is sent that includes the valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for the UE. In another aspect, a random access preamble for random access is received and a RAR is sent that includes a temporary C-RNTI. A message is received that includes a valid C-RNTI instead of the temporary C-RNTI as a C-RNTI for a UE if the UE already has the valid C-RNTI.