Uplink Data Multiplexing with Reference Symbols
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Solution Overview
Problem
Wireless communication systems, particularly in LTE, face inefficiencies due to the overhead of Demodulation Reference Signals (DM RS) in uplink transmissions, which diminish data capacity by occupying a significant portion of the transmission bandwidth.
Innovation Solution
The method involves multiplexing additional data symbols with the DM RS symbols within the same time-frequency extent, using orthogonal frequency division multiplexing (OFDM) or single-carrier frequency division multiplexing (SC-FDM) techniques, and applying specific cover codes or sequence manipulations to enable efficient data transmission while maintaining channel estimation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Demodulation Reference Signals (DM RS) are transmitted in uplink communications, then channel estimation and data demodulation are enabled, but data capacity is reduced due to overhead occupying significant transmission bandwidth
Solution Approach 1:
The patent combines reference symbols and data symbols into the same time-frequency resources through multiplexing. Specifically, reference symbols are inserted at specific positions within the uplink transmission, and data symbols are placed in the remaining positions, allowing both functions to coexist in the same resource block without requiring separate dedicated resources for reference signals.
Solution Approach 2:
The patent makes the uplink transmission resources serve multiple functions simultaneously. The same time-frequency resources that carry data also carry reference information for channel estimation. This is achieved by embedding reference symbols within the data transmission structure, allowing the system to use a single resource for both data communication and channel characterization purposes.
2Measurement precision
If time multiplexing of data symbols and reference symbols is used, then channel estimation is possible, but the system capacity for carrying actual data symbols is diminished
Solution Approach 1:
The patent merges reference symbol transmission and data symbol transmission into the same time-frequency resources. Instead of allocating separate time slots or frequency bands for reference signals, the invention integrates them within the same resource blocks, with reference symbols positioned at specific locations and data symbols filling the remaining positions, thereby maximizing data symbol count while maintaining estimation capability.
Data Source
AI summary
Methods, devices and computer program products are provided to improve uplink communications in a wireless communication system. Reference symbols in an uplink transmission radio subframe are time-frequency multiplexed with additional data symbols. The multiplexed data symbols are transmitted in an uplink transmission to another device within the wireless communication network along with non-multiplexed data symbols. The multiplexing operations enable the transmission of additional data symbols without increasing the overhead associated with the transmission of symbols in the radio subframe.