Mobile Station Uplink Synchronization Management
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Solution Overview
Problem
In the UETRA system, mobile station devices face issues with maintaining uplink synchronization consistency and correctly detecting resource assignments during random access, leading to errors and degraded communication quality due to inconsistent synchronization states between mobile and base station devices.
Innovation Solution
The system employs a mobile station device that transmits a random access preamble and performs uplink timing alignment based on synchronization timing deviation information from the base station's response, while managing uplink synchronous status using a timer and monitoring both RA-RNTI and C-RNTI for resource assignments to prevent unnecessary error recovery and ensure accurate resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station device performs uplink timing alignment based on synchronization timing deviation information from random access response, then uplink synchronization is improved, but inconsistency between mobile and base station synchronization states occurs when in uplink synchronous status
Solution Approach 1:
The mobile station device dynamically changes its behavior based on its synchronization status. When in uplink asynchronous status, it performs timing alignment based on random access response. When in uplink synchronous status, it prohibits timing alignment to maintain consistency. This dynamic adaptation resolves the contradiction by adjusting the timing alignment behavior according to the current synchronization state.
Solution Approach 2:
The invention changes the parameter of timing alignment execution based on the synchronization status parameter. By monitoring whether the mobile station is in synchronous or asynchronous status, the system adjusts whether to apply timing alignment corrections from random access responses, thereby preventing synchronization state inconsistency while maintaining reliable uplink synchronization.
2Ease of operation
If the mobile station device monitors only RA-RNTI in random access response, then random access processing is simplified, but downlink resource assignment notified by C-RNTI is erroneously ignored
Solution Approach 1:
The mobile station device dynamically adjusts its monitoring behavior based on synchronization status. In uplink asynchronous status, it monitors only RA-RNTI for simplified random access processing. In uplink synchronous status, it monitors both RA-RNTI and C-RNTI to ensure accurate detection of resource assignments. This dynamic monitoring strategy resolves the contradiction between simplicity and reliability.
Solution Approach 2:
The mobile station device preliminarily determines its synchronization status before initiating random access monitoring. Based on this preliminary assessment, it configures its monitoring strategy in advance - either monitoring only RA-RNTI or both RA-RNTI and C-RNTI - thereby avoiding the need to switch monitoring modes during operation and ensuring correct resource assignment detection.
3Stability of the object's composition
If the mobile station device performs timing alignment in uplink synchronous status, then synchronization is maintained, but unnecessary error recovery processes are triggered
Solution Approach 1:
The mobile station device preliminarily checks its synchronization status before performing timing alignment operations. By checking whether it is already in uplink synchronous status before processing random access responses, the device avoids unnecessary timing alignment operations that would trigger error recovery processes, thereby maintaining stability while preserving communication efficiency.
Data Source
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AI summary
Embodiments of the present invention relate to a base station device is adapted to transmit timing deviation information to a mobile station device for the mobile station device to manage an uplink synchronous status by using a timer so that the uplink synchronous status is sustained until the timer expires after the timer is reset on receiving the timing deviation information, wherein the base station device is adapted to receive a random access preamble whose preamble ID was randomly selected by the mobile station device and sent from the mobile station device; and is adapted to send to the mobile station device a random access response corresponding to the random access preamble, the random access response comprising timing deviation information used for the mobile station device to discard in an uplink synchronous status.