Access Terminal Identifier Confusion Resolution
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Solution Overview
Problem
In wireless communication systems, the limited number of node identifiers can lead to confusion when multiple base stations are assigned the same identifier, making it difficult for access terminals to determine the correct target base station during handover, as the serving node lacks the full identity of the target, resulting in potential access privilege issues.
Innovation Solution
The access terminal acquires a unique identifier associated with the target node by utilizing a time gap during which it temporarily ceases monitoring from the serving node to receive transmissions from the potential target node, and then uses this identifier to initiate handover operations, or receives handover preparation information from the serving node to complete the handover to a prepared target node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a limited number of node identifiers are used in the network, then device complexity and resource usage are reduced, but identifier confusion occurs when multiple base stations are assigned the same identifier
Solution Approach 1:
The patent segments the identifier into two parts: a first identifier (e.g., physical cell identifier) for basic identification and a second identifier (e.g., global cell identifier) for unique identification. This segmentation allows the system to use limited first identifiers while maintaining reliable unique identification through the combination with second identifiers, resolving the contradiction between device complexity and identifier uniqueness.
2Stability of the object's composition
If the access terminal continuously monitors transmissions from the serving node, then connection stability is maintained, but the terminal cannot acquire unique identifier information from potential target nodes during handover
Solution Approach 1:
The patent implements preliminary action by having the access terminal acquire the second identifier of the target base station before actually performing handover. The terminal uses measurement gaps to temporarily cease monitoring from the serving node and instead acquires unique identifier information from potential target nodes in advance. This ensures that when handover is needed, the terminal already possesses the necessary unique identifier information, maintaining both connection stability and information completeness.
3Ease of operation
If the serving node does not have the full identity of the target base station, then handover procedures are simplified, but access privilege verification cannot be performed
Solution Approach 1:
The patent introduces the second identifier (global cell identifier) as an intermediary element that bridges the serving node and target base station. The access terminal acquires this second identifier from the target base station during measurement gaps and includes it in measurement reports sent to the serving node. This intermediary identifier allows the serving node to obtain full identity information of the target base station without complicating the handover procedure, enabling both simplified operations and reliable access privilege verification.
Data Source
AI summary
Confusion resulting from assigning the same node identifier to multiple nodes is resolved through the use of confusion detection techniques and the use of unique identifiers for the nodes. In some aspects a network may provide a time gap (e.g., an asynchronous time gap) during which an access terminal may temporarily cease monitoring transmissions from a source node so that the access terminal may acquire a unique identifier from a target node. In some aspects an access terminal may commence handover operations at a target node after determining whether the access terminal is allowed to access the target node. In some aspects a source node may prepare several target nodes for potential handover in the event confusion is detected or likely. Here, the source node may send information relating to the preparation of the potential target nodes to the access terminal whereby the access terminal uses the handover preparation information to initiate a handover at that target node.