Partial Uplink Repeater Synchronization via Downlink Map Extraction
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Solution Overview
Problem
Existing wireless communication networks face challenges in enhancing uplink signal reception due to the longer path length from mobile stations to base stations via repeaters, which affects synchronization and interference, especially in scenarios where the base station is unaware of the uplink repeater or cannot cooperate with it.
Innovation Solution
A partial uplink repeater system that receives and retransmits uplink signals from mobile stations to base stations, using methods such as physical or logical retransmission, with options for in-place or out-of-place allocation within the uplink frame, and an interleaved transmission scheme to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repeater is used to extend coverage range, then signal reception quality is improved, but the transmission path length increases causing synchronization issues
Solution Approach 1:
The repeater performs preliminary actions by receiving downlink frames early, extracting map information in advance, and preparing uplink transmission parameters before the actual uplink transmission occurs. This allows the repeater to pre-synchronize with the base station timing, compensating for the extended path length and maintaining proper frame alignment despite the additional hops in the transmission path.
2Reliability
If the repeater retransmits uplink signals, then uplink reception quality is improved, but interference with other signals increases
Solution Approach 1:
The repeater applies local quality by selectively repeating only specific uplink signals identified through map extraction, rather than blindly retransmitting all received signals. By using the downlink map information to identify which uplink allocations correspond to weak signals needing repetition, the repeater focuses its retransmission effort only where needed, minimizing unnecessary interference to other simultaneous transmissions while improving reception quality for targeted signals.
3Adaptability or versatility
If the repeater operates without network cooperation, then deployment flexibility is improved, but synchronization accuracy deteriorates
Solution Approach 1:
The repeater implements self-service by autonomously extracting timing and allocation information directly from downlink frames received from the base station, without requiring external configuration or network control. The repeater independently parses the downlink map to identify uplink allocations, determines repetition parameters, and synchronizes its transmissions based solely on the timing information embedded in the received downlink signals, enabling flexible deployment while maintaining synchronization accuracy.
Data Source
AI summary
A method for repetition of uplink transmissions comprises: a repeater apparatus, aka uplink repeater, has a controller, a downlink receiver and an uplink transmitter and receiver. Use the downlink receiver to receive a downlink signal from a base station whose cell the uplink repeater is serving. For downlink frame(s) thus received: the controller demodulates at least a portion of the downlink frame and extracts MAP_D data describing allocation of an uplink transmission in upcoming uplink frame(s) to be transmitted after the downlink frame; controller determines a subset of UL transmission allocations to be repeated, to define a subset of mobile stations in the cell, whose uplink transmissions are to be repeated; the uplink receiver receives the UL transmissions to be repeated from each mobile station, and repeats the UL transmissions to be repeated by commanding the UL transmitter to send the content.