Uplink Transmit Switching With Multiple TAGs and Gap Control
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Solution Overview
Problem
Existing 5G wireless communication technologies are limited by the restriction of uplink transmit switching to a single timing advance group, lacking flexibility in utilizing a broader set of carriers and failing to accommodate different timing advance values across multiple groups.
Innovation Solution
Wireless devices are configured to use multiple carriers spanning one or more radio frequency bands, allowing switching between carriers belonging to different timing advance groups (TAGs) with a defined switching gap time period to manage timing advance value changes, and employing time division multiplexing for overlapping transmission occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uplink transmit switching is restricted to a single timing advance group, then timing alignment is simplified, but carrier utilization flexibility is reduced
Solution Approach 1:
The patent divides the carrier set into multiple timing advance groups (TAGs), where each TAG shares a common timing advance value. This segmentation allows the system to manage timing alignment on a group level rather than individually for each carrier, reducing overall complexity while enabling flexible switching across multiple groups.
Solution Approach 2:
The patent introduces dynamic TAG switching mechanisms that allow the wireless device to switch between different TAGs based on current transmission needs. The switching point determination logic dynamically selects optimal switching moments, enabling adaptive carrier utilization while maintaining timing synchronization through coordinated TAG transitions.
2Adaptability or versatility
If multiple carriers spanning different frequency bands are used, then carrier aggregation capability is enhanced, but switching gap management becomes more complex
Solution Approach 1:
The patent performs preliminary determination of switching points before actual carrier switching occurs. By calculating and identifying optimal switching moments in advance, the system prepares timing advance group transitions proactively, reducing the complexity of real-time switching gap management while supporting multi-band carrier aggregation.
3Adaptability or versatility
If dynamic carrier switching is implemented, then transmission flexibility is improved, but transmission overlap issues increase
Solution Approach 1:
The patent incorporates feedback mechanisms where the determination of switching points considers current transmission states and schedules. This feedback loop allows the system to identify switching moments that avoid overlapping transmissions, maintaining reliability while preserving the flexibility benefits of dynamic carrier switching.
Data Source
AI summary
This application relates to wireless communications, including methods and apparatus to manage uplink (UL) transmit switching with multiple timing advance groups (TAGs) for wireless devices. A wireless device is configured to use multiple carriers selected from a set of available carriers that can be associated with different TAGs. When a second set of carriers, used after switching from a first set of carriers, includes carriers that belong to different TAGs, the wireless device determines whether to transmit on one or more first uplink transmission occasions for each of the carriers in the second set of carriers based on whether a first UL transmission occasion for at least one carrier overlaps a switching gap time period. The wireless device can disallow transmission on first UL transmission occasions of one or more carriers to accommodate the overlap.