Uplink Transmitter Chain Switching for Clear Band-State Scheduling
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Solution Overview
Problem
Existing wireless communication systems face ambiguity in determining the transmitter state during uplink switching between multiple frequency bands, leading to inefficiencies in transmitter utilization and scheduling.
Innovation Solution
A method for managing uplink transmission chain switching by using a configuration with Tx selection indication to resolve non-unique transmitter states across cells in multiple frequency bands, including parameters to indicate whether to switch transmitters and to which frequency band to switch them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE configures 2 transmitters for 2 component carriers (1T-1T), then the UE can support 2 concurrent single port transmissions in 2 component carriers, but the system complexity increases due to multiple transmitter states and switching configurations
Solution Approach 1:
The patent implements dynamic transmitter state switching between Case 1 (1T-1T) and Case 2 (0T-2T) configurations based on real-time scheduling requirements. The UE can transition between different transmitter states to optimize for either concurrent transmissions or spectral efficiency, resolving the contradiction by making the system adaptable rather than static
Solution Approach 2:
The patent changes the operational parameters of transmitters by switching between different configuration cases (1T-1T vs 0T-2T). This parameter change allows the system to adjust transmitter states dynamically, enabling the UE to optimize between productivity and complexity based on current network conditions and scheduling requirements
2Productivity
If a UE switches transmitters during uplink switching between frequency bands, then transmitter utilization improves, but ambiguity arises in determining the transmitter state after switching
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports its current transmitter state and configuration case to the base station. This feedback loop allows the base station to know the exact transmitter state after switching, eliminating ambiguity while maintaining high transmitter utilization through dynamic switching between frequency bands
Solution Approach 2:
The patent establishes preliminary agreements on transmitter state configurations through RRC signaling before switching occurs. By pre-defining the possible states and transitions, the system ensures that both the UE and base station have consistent understanding of the transmitter state, preventing information loss during switching operations
3Ease of operation
If the base station schedules transmissions in only one band, then scheduling simplicity is maintained, but one transmitter remains idle reducing system efficiency
Solution Approach 1:
The patent enables dynamic transmitter switching between different frequency bands based on scheduling needs. When the base station schedules transmissions in one band, the UE can switch its transmitter to that band, allowing the previously idle transmitter to become active. This dynamic adaptation maintains scheduling simplicity while improving transmitter utilization
Data Source
AI summary
A method in a user equipment (UE) equipped with a first transmitter and a second transmitter, the method comprising: transmitting a first uplink transmission using the first transmitter switched to a first frequency band and using a second transmitter switched to a second frequency band; and receiving, from a radio access network (RAN), an uplink switching configuration for a second uplink transmission using the first transmitter, the uplink switching configuration including (i) a first parameter to indicate whether to switch the second transmitter away from the second frequency band, and (ii) a second parameter indicating to which frequency band the UE is to switch the second transmitter; transmitting the second uplink transmission in accordance with the uplink switching configuration.