Access Terminal H-RNTI Update for Network Cell Redirection
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Solution Overview
Problem
In wireless communication systems, when a network initiates cell redirection, access terminals often lack a valid H-RNTI for the target cell, leading to inability to utilize HS-DSCH, as the previous RNTI is not usable, and conventional systems do not perform a cell update procedure in such scenarios.
Innovation Solution
Access terminals are equipped with a processing circuit and communications interface to receive redirection messages, determine if the current RNTI is invalid for the target cell, and initiate a cell update procedure to acquire a valid H-RNTI, even if the network has knowledge of the terminal's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the network initiates cell redirection without providing a valid H-RNTI in the redirection message, then the device complexity is reduced and the redirection process is simplified, but the access terminal cannot utilize HS-DSCH in the target cell because the previous RNTI is invalid
Solution Approach 1:
The access terminal proactively determines whether its current RNTI is valid for the target cell before attempting to use HS-DSCH, and initiates a cell update procedure in advance to obtain a valid H-RNTI if needed. This preliminary validation and update action prevents service interruption while maintaining simple redirection messaging.
Solution Approach 2:
The access terminal autonomously determines RNTI validity for the target cell and self-initiates the cell update procedure when needed, without requiring the network to provide H-RNTI information in the redirection message. This self-service approach simplifies the network side while ensuring the terminal maintains proper identification.
2Reliability
If the access terminal initiates a cell update procedure after determining RNTI invalidity, then a valid H-RNTI is acquired for HS-FACH monitoring, but the communication process time increases due to the additional procedure
Solution Approach 1:
The access terminal determines RNTI validity for the target cell immediately upon receiving the redirection message, before completing the cell redirection. This preliminary determination allows the terminal to proactively initiate a cell update procedure if needed, rather than discovering RNTI invalidity later and experiencing service interruption.
Solution Approach 2:
The cell update procedure is dynamically initiated only when the access terminal determines that its current RNTI is invalid for the target cell. This conditional approach avoids unnecessary update procedures when the existing RNTI is still valid, thereby minimizing additional time loss while ensuring H-RNTI validity when required.
3Quantity of substance
If the network does not include H-RNTI information in the redirection message, then the message size and processing overhead are reduced, but the access terminal lacks the necessary information to maintain communication in the target cell
Solution Approach 1:
The access terminal autonomously determines whether its current RNTI is valid for the target cell and self-initiates a cell update procedure to obtain a valid H-RNTI when needed. This eliminates the need for the network to include H-RNTI information in the redirection message, minimizing message size while ensuring the terminal has necessary identification information through its own actions.
Solution Approach 2:
The access terminal proactively performs RNTI validity determination and initiates cell update procedures before needing to use HS-DSCH or HS-FACH in the target cell. This preliminary information acquisition ensures communication capability is established in advance, eliminating the need for the network to provide H-RNTI information in the redirection message.
Data Source
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AI summary
Access terminals are adapted to facilitate updating an access terminal with a valid H-RNTI in response to a network-initiated redirection of an access terminal from a serving cell to a target cell in a wireless communications system. According to at least one example, an access terminal can acquire a target cell in response to a networkinitiated redirection indicated by a received redirection message. A determination can be made that a current radio network temporary identity (RNTI) associated with the access terminal is invalid for use in the target cell. In response to the determination that the RNTI is invalid for use in the target cell, a cell update procedure may be initiated to obtain a valid RNTI for use in the target cell. Other aspects, embodiments, and features are also included.