LTE Single-Card Dual-Standby Terminal Voice Interference Management
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Solution Overview
Problem
The existing LTE single-card dual-standby multi-mode terminals face significant mutual interference between CS and PS services, which cannot be completely resolved by using filters, leading to increased costs and suboptimal voice service quality, especially when frequency bands are close and antenna spacing is short.
Innovation Solution
The terminal detects whether a peer communication terminal is in a voice silent period and adjusts data transmission accordingly, suspending uplink data transmission when the peer is not in a silent period and resuming it when in a silent period to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filters are used to reduce mutual interference between CS and PS services, then interference level is reduced, but terminal cost increases due to high-performance filters with better out-of-band attenuation characteristics
Solution Approach 1:
The patent implements dynamic adjustment of uplink transmission parameters based on the working states of both communication subsystems. The terminal determines whether to suspend uplink transmission in the second communication subsystem based on real-time detection of the first subsystem's working state, creating a dynamic interference management mechanism that adapts to changing conditions rather than relying on static filter solutions
Solution Approach 2:
The patent changes the transmission parameter state by suspending or resuming uplink data transmission based on the working states of the two communication subsystems. When the first subsystem is in a specific state (such as voice activity detection results), the terminal adjusts the uplink transmission parameter from active to suspended or vice versa, thereby dynamically controlling interference levels without requiring additional hardware filters
2Reliability
If transmit power is increased to improve communication quality, then signal quality is improved, but mutual interference increases affecting receiver sensitivity in another mode
Solution Approach 1:
The patent implements dynamic coordination between the two communication subsystems by having the terminal detect the working state of the first subsystem and accordingly adjust the uplink transmission in the second subsystem. This dynamic adjustment ensures that high transmit power is used only when it will not cause harmful interference to the other subsystem, thereby maintaining both communication quality and minimizing interference
3Volume of moving object
If antenna spacing is reduced to compact terminal design, then terminal size is reduced, but mutual interference increases when frequency bands are close
Solution Approach 1:
The patent compensates for the reduced physical spacing between antennas by implementing dynamic transmission control. When frequency bands are close and interference risk is high, the terminal suspends uplink transmission in one subsystem when the other subsystem is actively transmitting, thereby maintaining compact form factor while dynamically managing the increased interference risk from reduced antenna spacing
Data Source
AI summary
The present invention is applicable to the field of communications technologies, and provides an method, the method includes: when a CS service and PS service of a local LTE single-card dual-standby multi-mode terminal are concurrent, detecting, by a local LTE single-card dual-standby multi-mode terminal, whether a peer communication terminal that is performing voice communication with it is in a voice silent period; when detecting that the peer communication terminal is not in the voice silent period, receiving, by the local LTE single-card dual-standby multi-mode terminal, downlink data in an LTE system, and suspending, by the local LTE single-card dual-standby multi-mode terminal, sending of uplink data in the LTE system at the same time; and when detecting that the peer communication terminal is in the voice silent period, sending the uplink data and receiving the downlink data, by the local LTE single-card dual-standby multi-mode terminal, in the LTE system.