Subband Full Duplex Random Access for TDD Uplink Coverage
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Solution Overview
Problem
TDD systems in wireless mobile communication face challenges with reduced coverage, increased latency, and reduced capacity due to limited uplink time duration, which can be addressed by implementing sub-band full duplex (SBFD) to enable simultaneous downlink and uplink operations.
Innovation Solution
A method and apparatus support sub-band full duplex by configuring terminals to utilize specific parameters for random access procedures, determining appropriate resource sets, and performing preamble transmissions on SBFD resources, allowing simultaneous downlink and uplink operations within a conventional TDD band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If TDD time domain resource is split between downlink and uplink, then system simplicity is maintained, but uplink coverage is reduced and latency is increased
Solution Approach 1:
The patent segments the frequency band into multiple subbands, allowing different subbands to be used for different purposes. Specifically, it divides the TDD band into subbands where some subbands can be used for uplink transmission while others remain for downlink, enabling simultaneous operation without requiring full system redesign.
Solution Approach 2:
The patent applies local quality by allowing different frequency subbands to have different transmission directions (uplink or downlink) simultaneously. This means that while the overall system maintains TDD operation, specific local frequency resources are allocated for uplink enhancement, improving coverage and latency locally without affecting the entire system.
2Device complexity
If TDD time domain resource is split between downlink and uplink, then system simplicity is maintained, but transmission capacity is reduced
Solution Approach 1:
The patent transitions from time-domain multiplexing alone to frequency-domain multiplexing by introducing subband division. This adds a frequency dimension to the resource allocation, allowing simultaneous uplink and downlink transmissions in different frequency subbands while maintaining the original time structure, thereby increasing overall transmission capacity.
3Reliability
If subband full duplex is implemented for simultaneous downlink and uplink, then coverage and capacity are improved, but system complexity increases
Solution Approach 1:
The patent segments the frequency band into multiple subbands, allowing different subbands to be used for different purposes. Specifically, it divides the TDD band into subbands where some subbands can be used for uplink transmission while others remain for downlink, enabling simultaneous operation without requiring full system redesign.
Solution Approach 2:
The patent introduces dynamic subband configuration where the network can flexibly assign different subbands for uplink or downlink based on traffic conditions and interference levels. This dynamic allocation allows the system to adapt to changing conditions while maintaining manageable complexity through standardized procedures.
4Productivity
If subband full duplex is implemented for simultaneous downlink and uplink, then transmission capacity is improved, but system complexity increases
Solution Approach 1:
The patent transitions from time-domain multiplexing alone to frequency-domain multiplexing by introducing subband division. This adds a frequency dimension to the resource allocation, allowing simultaneous uplink and downlink transmissions in different frequency subbands while maintaining the original time structure, thereby increasing overall transmission capacity.
Data Source
AI summary
A method and apparatus to support sub-band full duplex is provided. In the method, the terminal receives from a base station a system information; the terminal triggers a random access procedure; the terminal determines set of features that are applicable for RA procedure; the terminal determines a set of RA resource based on the features; and the terminal performs preamble transmission on SBFD RO in case that the set of RA resource is associated with SBFD RO. the terminal determines whether a set of RA resource is associated with SBFD RO based on a specific parameter of the set of RA resource.