UE-Specific RNTI Masking for Random Access Response Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, user equipment (UE) faces complexity in receiving random access responses due to shared random access radio network temporary identifiers (RA-RNTIs) across multiple UEs and carriers, leading to incorrect timing advance applications and communication errors.
Innovation Solution
The use of dedicated user equipment-specific temporary identifiers, such as C-RNTI or dedicated RA-RNTI, to mask and demask control signaling for random access responses, allowing UEs to correctly identify intended responses and reduce misapplication of timing advances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If RA-RNTI is shared across multiple UEs and carriers for random access response scheduling, then resource utilization is improved, but identification accuracy deteriorates leading to incorrect timing advance applications
Solution Approach 1:
The patent segments the identification process by introducing a two-stage mechanism: first using shared RA-RNTI for initial response scheduling, then using UE-specific C-RNTI for confirmation and timing advance application. This segmentation allows resource sharing while maintaining precise identification at the critical decision point.
Solution Approach 2:
The patent introduces an intermediary confirmation mechanism where the network sends a second control signal masked with UE-specific C-RNTI that confirms the intended recipient before the UE applies timing advance. This intermediary step prevents misapplication while maintaining efficient resource usage through the initial shared RA-RNTI scheduling.
2Adaptability or versatility
If blind detection is used for PDCCH control signaling with RA-RNTI masking, then universality is improved, but device complexity increases due to multiple detection attempts
Solution Approach 1:
The patent applies preliminary action by having the network send a first control signal with RA-RNTI masking that schedules the random access response, followed by a second control signal with C-RNTI masking that confirms the intended recipient. This preliminary scheduling followed by confirmation reduces the need for extensive blind detection attempts while maintaining universal applicability.
Solution Approach 2:
The patent implements feedback through the two-signal mechanism where the first signal provides scheduling information and the second signal provides confirmation feedback. This feedback structure allows the UE to reduce blind detection complexity by stopping detection upon receiving the confirming second signal, while still maintaining universal compatibility with the random access procedure.
3Reliability
If dedicated UE-specific identifiers are used to mask control signaling, then reliability is improved, but loss of information increases due to additional signaling overhead
Solution Approach 1:
The patent merges the identification function into the existing control signaling structure by using the same PDCCH format and structure, only changing the masking identifier from RA-RNTI to C-RNTI for the second signal. This merging approach ensures reliable UE-specific identification while minimizing additional signaling overhead by reusing existing protocol elements.
Solution Approach 2:
The patent makes the control signaling multi-functional by using it for both initial scheduling (with RA-RNTI) and confirmation (with C-RNTI). This universality allows the same signaling mechanism to serve multiple purposes, reducing the need for separate dedicated signaling channels and thereby minimizing information loss due to overhead.
Data Source
AI summary
Embodiments of the present invention disclose a random access response receiving and sending method, a user equipment, a base station, and a system. The method includes: after sending a dedicated random access preamble to a network side, on a physical downlink control channel, according to a pre-obtained dedicated identifier, detecting control signaling masked by using the dedicated identifier, where the dedicated identifier is a user equipment-specific temporary identifier configured by the network side for the user equipment, and the control signaling includes information about a physical downlink shared channel used to send a random access response and information required for decoding the random access response; and receiving the random access response on a corresponding physical downlink shared channel according to the control signaling.