Cellular Signaling for Interference Cancellation
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Solution Overview
Problem
Current methods for reducing interference in cellular telecommunications networks, such as LTE, are inefficient due to the complexity and energy consumption of blind decoding PDCCH channels and the high computational complexity of identifying interferer terminals, especially in MU-MIMO and intercellular interference scenarios.
Innovation Solution
A signaling method that allocates and publishes a condensed open temporary network identifier to interferer terminals, allowing them to decode transmission resources more efficiently and reducing the need for extensive blind decoding, thereby facilitating interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals perform blind decoding of PDCCH channels to identify interferer transmission parameters, then interference cancellation capability is improved, but terminal complexity and energy consumption increase significantly
Solution Approach 1:
The base station performs preliminary actions by allocating open temporary identifiers to interferer terminals and publishing this information before the victim terminal needs to perform interference cancellation. This allows the victim terminal to have advance knowledge of which identifiers to monitor, eliminating the need for exhaustive blind decoding of all possible PDCCH channels.
Solution Approach 2:
The invention extracts only the necessary information (open temporary identifiers of interferer terminals) from the complete set of transmission parameters and publishes it separately through system information blocks. This allows victim terminals to focus their decoding efforts only on relevant channels identified by these published identifiers, rather than performing complex blind decoding across all possible channels.
2Object-affected harmful factors
If terminals perform blind decoding to identify all possible interferers, then interference suppression is improved, but energy consumption increases
Solution Approach 1:
The base station publishes open temporary identifiers in advance through system information blocks, enabling victim terminals to know beforehand which interferer identifiers to monitor. This preliminary publication eliminates the need for energy-consuming blind decoding of all possible PDCCH channels, as terminals can directly monitor only the relevant channels identified by the published identifiers.
3Reliability
If the base station publishes complete transmission parameters of interferer terminals, then victim terminals can perform precise interference cancellation, but signaling overhead increases
Solution Approach 1:
The invention extracts and publishes only the essential open temporary identifiers of interferer terminals through system information blocks, rather than transmitting complete transmission parameters. This selective publication provides victim terminals with sufficient information to identify and cancel interference while minimizing signaling overhead.
Solution Approach 2:
The invention segments the transmission parameter information by separating the open temporary identifiers (which are published in system information blocks) from the complete transmission parameters (which remain in PDCCH channels). This segmentation allows victim terminals to first use the published identifiers to identify interferers, then decode only the necessary additional parameters, reducing overall signaling requirements.
4Measurement precision
If terminals monitor all PDCCH channels to identify interferers, then interference detection accuracy is improved, but processing time increases
Solution Approach 1:
The base station performs preliminary publication of open temporary identifiers through system information blocks before the victim terminal needs to detect and cancel interference. This advance publication allows the terminal to immediately identify relevant interferers without time-consuming blind monitoring of all PDCCH channels, significantly reducing processing time while maintaining detection accuracy.
Data Source
AI summary
A signaling method for implementation by a base station controlling at least one cell of a network attached to at least one terminal, uniquely identified on this cell by a dedicated temporary network identifier, is provided. It may comprise allocating an open temporary network identifier to an interferer terminal identified by the base station as being capable of interfering with at least one communication established by another terminal attached to this cell or a neighbor cell, publishing this open temporary network identifier and sending a first physical control channel according to a predetermined format to the interferer terminal comprising a condensed representation of the open identifier, this first channel coded using the dedicated temporary network identifier of the interferer terminal. The method may comprise sending a second physical control channel to the interferer terminal allocating it transmission resources over the cellular network, coded using the open temporary network identifier.