Frequency Interval Determination for Off-Band Emission Control
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Solution Overview
Problem
In telecommunications networks, especially in LTE systems, user equipment often transmits signals at high power, leading to off-band emissions that exceed maximum limit values, causing interference and desensitization of receivers, particularly when attenuation is high, and existing solutions either underutilize transmission capacity or increase the risk of decoding errors.
Innovation Solution
A method and system that determine the interval of frequencies for signal transmission by user equipment based on a table of references to reduce maximum power transmission, ensuring off-band power is below a predetermined limit, allowing for maximal information transfer while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment transmits signals at high power to overcome high propagation attenuation, then the transmission reliability is improved, but off-band emissions exceed maximum limit values causing interference to neighboring frequency bands
Solution Approach 1:
The base station performs preliminary determination of the frequency interval before resource allocation, using a table of references to identify intervals that guarantee off-band emissions remain below maximum limit values. This preventive approach ensures that high-power transmissions do not cause interference to neighboring bands.
Solution Approach 2:
The invention changes the frequency interval parameter selected for transmission based on lookup table values that correspond to different transmission powers and channel conditions. By selecting appropriate frequency intervals from the table, the system adapts parameters to maintain reliability while controlling off-band emissions.
2Object-generated harmful factors
If user equipment reduces maximum transmission power to comply with off-band emission limits, then interference to neighboring frequency bands is reduced, but transmission capacity and data rate are degraded
Solution Approach 1:
Instead of reducing power in the frequency dimension, the invention shifts transmissions to a different frequency interval dimension that is predetermined to have favorable off-band emission characteristics. This allows maintaining high transmission power while complying with emission limits by changing the frequency location rather than the power level.
Solution Approach 2:
The base station uses a table of references that contains predetermined frequency interval configurations optimized for different scenarios. Rather than calculating optimal intervals in real-time, the system copies from pre-computed reference values that guarantee both emission compliance and adequate transmission capacity.
3Adaptability or versatility
If the base station allocates frequency intervals without considering off-band emission constraints, then resource allocation flexibility is improved, but signals transmitted outside the allocated interval cause desensitization of the receiver
Solution Approach 1:
The base station performs preliminary determination of suitable frequency intervals using a table of references before allocating resources to user equipment. This advance preparation ensures that allocated intervals inherently satisfy off-band emission constraints, preventing receiver desensitization while maintaining allocation flexibility.
Solution Approach 2:
The table of references acts as an intermediary between the base station's resource allocation decisions and the physical layer transmission constraints. It translates high-level allocation requirements into specific frequency interval selections that automatically satisfy emission limits and prevent harmful effects on receivers.
Data Source
AI summary
A method allows determination of a frequency interval for the emission, by an item of user equipment, of a signal to be sent to a base station in a telecommunications network, the frequency interval being within a predetermined frequency band over which the base station works, the method including the determination of frequency interval, wherein the determination of the frequency interval is achieved from a table of references including maximum power reduction values for the emission of a signal by the item of user equipment so that the power of the signal emitted by the item of user equipment at a predetermined out-of-band frequency is less than a predetermined maximum power limit value.