Downlink Synchronization Channels Transparent to Active Users
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Solution Overview
Problem
In wireless communications, particularly in downlink synchronization channels, existing technologies face challenges in making synchronization channels transparent to shared channel users in active operation states, leading to increased complexity and resource inefficiency due to the need for active users to process and discard synchronization channels unnecessarily.
Innovation Solution
Assigning N resource units for synchronization channels in predetermined positions within radio frames and automatically discarding them during normal active operation, allowing users to focus on data processing without interference from synchronization channels, thereby simplifying receiver designs and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization channels are transmitted in predetermined positions within radio frames, then cell search and synchronization functions are enabled, but active users must process and discard these channels unnecessarily, increasing receiver complexity
Solution Approach 1:
The patent extracts synchronization channel processing from the active user's receiver workflow by assigning dedicated resource units that the user automatically discards. This separates the synchronization function (performed during cell search) from the data processing function (performed during active operation), eliminating unnecessary processing complexity while maintaining synchronization reliability through predetermined resource unit assignments.
Solution Approach 2:
The patent applies local quality by creating different processing modes for different operational states: during cell search, the receiver processes synchronization channels in assigned resource units, but during active operation, the same resource units are automatically discarded. This localized differentiation of processing quality based on operational context resolves the contradiction between maintaining synchronization capability and reducing active receiver complexity.
2Adaptability or versatility
If synchronization channels are made visible to active users, then users can perform handover measurements, but resource allocation efficiency decreases due to dedicated resource units that cannot be used for data transmission
Solution Approach 1:
The patent treats synchronization channel resource units as disposable resources during active operation. These resource units are assigned for synchronization purposes but automatically discarded by active users, allowing the network to maintain synchronization channel transmission without requiring active users to efficiently utilize these resources for data. This resolves the contradiction by making the resource allocation simple and dedicated rather than requiring complex sharing mechanisms.
3Reliability
If resource units are assigned for synchronization channels in predetermined positions, then synchronization channel transmission is structured and reliable, but flexibility in resource allocation is reduced
Solution Approach 1:
The patent segments the radio frame into specific resource units with predetermined assignments for synchronization channels. This segmentation provides structured and reliable synchronization transmission while allowing the remaining resources to be flexibly allocated for data transmission. The predetermined position assignment ensures synchronization reliability, while the segmented structure allows other parts of the frame to adapt to varying data requirements.
Data Source
AI summary
The specification and drawings present a new method, system, apparatus and software product for locating synchronization channels (SCH) in a downlink which are received by a user equipment (UE), such that the downlink synchronization channels are transparent to shared channel users (or UE) which can be used, e.g., in evolving and future systems such as EUTRAN, 4G, 3GPP2, etc. The synchronization channels are arranged so that they are transparent to the UE in a normal active operation state. For that, the resources given to the SCH are chosen to be one or more allocatable resources (resource units) in a sub-frame or in a plurality of sub-frames. In an allocation table, these resources may not be allocated to the UE and in the active state the UE sees that and discards these resources just as it discards any other resource that is not allocated to it.