PUSCH Transmission Indication With Dynamic QCL for SBFD Slots
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Solution Overview
Problem
In time-division duplex (TDD) technology, uplink transmission delays occur due to the need to wait for specific slots, and the use of subband full duplex (SBFD) technology introduces challenges in beam and channel differences between SBFD and non-SBFD slots, affecting receiving performance in terminal devices.
Innovation Solution
A transmission indication method that utilizes quasi co-location (QCL) configuration information to adapt antenna and beam changes in different time units, allowing terminal devices to perform physical channel transmissions based on specific QCL configuration information, enhancing receiving and sending performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SBFD technology is used to enable simultaneous uplink and downlink transmission, then transmission efficiency is improved, but receiving performance deteriorates due to beam and channel differences between SBFD and non-SBFD slots
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting QCL configuration information based on time unit types. Different QCL parameters (such as spatial parameters, frequency parameters, time parameters) are configured for different time unit types (SBFD slots vs. non-SBFD slots), allowing the system to adapt to beam and channel differences while maintaining receiving performance. This resolves the contradiction by changing the transmission parameters to match the specific characteristics of each slot type.
Solution Approach 2:
The patent implements dynamics by making the QCL configuration information dynamic rather than static. The network device determines appropriate QCL configurations based on the current time unit type and transmits these configurations to the terminal device. This dynamic adaptation allows the system to switch between different beam and channel configurations for SBFD and non-SBFD slots, maintaining receiving performance while enabling simultaneous uplink and downlink transmission.
2Adaptability or versatility
If different antennas are used for physical downlink channel transmission in SBFD and non-SBFD slots, then simultaneous uplink and downlink transmission is enabled, but receiving performance deteriorates due to beam differences
Solution Approach 1:
The patent resolves this contradiction by changing the spatial parameters in QCL configuration information to match the antenna and beam characteristics of different time unit types. For SBFD slots where different antennas are used, the QCL configuration includes spatial parameters that correspond to the specific antenna and beam configuration for that slot type, ensuring the terminal device can correctly receive signals despite antenna changes.
Solution Approach 2:
The network device performs preliminary action by determining and configuring the appropriate QCL parameters in advance before actual transmission. The network device identifies the time unit type and pre-configures the corresponding QCL information including antenna and beam parameters, then transmits this configuration to the terminal device before the actual data transmission occurs. This ensures the terminal device is prepared with the correct receiving parameters before receiving signals from different antennas.
Data Source
AI summary
A terminal device receives a physical downlink control channel (PDCCH) from a network device, wherein the PDCCH bears an uplink grant that is used to schedule a physical uplink shared channel (PUSCHH). The the PUSCH is associated with a nearest sounding reference signal (SRS) corresponding to an SRS identifier and the uplink grant includes the SRS identifier and then the terminal device sends the PUSCH.