Idle Mode State Synchronization in BWA Systems
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Solution Overview
Problem
In Broadband Wireless Access (BWA) communication systems, there is a lack of effective state synchronization between base stations (BS) and mobile stations (MS) during transitions from awake to idle mode, leading to potential misoperations and communication disruptions due to unsolicited DREG-CMD messages and failed message transmissions.
Innovation Solution
The introduction of a De-Registration-Acknowledgement (DREG-ACK) message by the mobile station (MS) in response to the DREG-CMD message from the base station, along with a DREG-ACK Response Timer and DREG-CMD Retries Count, ensures that the base station retransmits the DREG-CMD message until an acknowledgement is received, preventing premature deletion of connection information and maintaining state synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the base station transmits unsolicited DREG-CMD messages to command mobile station transition to idle mode, then power consumption of mobile station is reduced, but state synchronization between base station and mobile station is lost leading to misoperations
Solution Approach 1:
The patent introduces an acknowledgment mechanism where the mobile station sends a DREG-ACK message back to the base station after receiving the DREG-CMD message. This feedback loop ensures that the base station can confirm whether the mobile station has successfully transitioned to idle mode, thereby maintaining state synchronization while still enabling power savings through unsolicited DREG-CMD transmissions.
Solution Approach 2:
The base station transmits the DREG-CMD message in advance without waiting for the mobile station to request idle mode transition. This preliminary action allows the mobile station to transition to idle mode proactively, reducing power consumption while the subsequent acknowledgment mechanism ensures state synchronization is maintained.
2Quantity of substance
If the base station deletes connection information after transmitting DREG-CMD message, then resources are freed for other users, but communication disruptions occur if mobile station fails to receive or acknowledge the message
Solution Approach 1:
The acknowledgment mechanism provides feedback to the base station about whether the mobile station successfully received and processed the DREG-CMD message. This allows the base station to determine when it is safe to delete connection information, ensuring resources are freed only after successful state transition while preventing communication disruptions.
Solution Approach 2:
The base station maintains connection information for a predetermined time after transmitting the DREG-CMD message before deleting it. This cushioning period acts as a safety buffer, allowing the base station to handle cases where the mobile station fails to receive or acknowledge the message, thereby preventing communication disruptions while still enabling resource management.
3Use of energy by moving object
If the mobile station transitions to idle mode without confirmation mechanism, then power consumption is minimized, but misoperations occur due to lack of state synchronization
Solution Approach 1:
The mobile station sends a DREG-ACK message to confirm successful reception and processing of the DREG-CMD message. This feedback ensures state synchronization between the mobile station and base station, preventing misoperations while still allowing the mobile station to transition to idle mode and minimize power consumption.
Data Source
AI summary
A method for controlling an idle mode in a broadband wireless access (BWA) communication system. A mobile station (MS) transmits to a base station (BS) a de-registration request (DREG-REQ) indicating a state transition request to the idle mode. The BS transmits to the MS a de-registration command (DREG-CMD) for commanding state transition to the idle mode. The MS transmits to the BS a de-registration acknowledgement (DREG-ACK) in response to the DREG-CMD.