Uplink Sub-Band Selection Using PUCCH Resource Mapping
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Solution Overview
Problem
In 5G New Radio (NR) unlicensed spectrum systems, terminals face challenges in determining sub-bands for uplink transmission when scheduling information lacks a sub-band indication field, leading to increased implementation complexity and reduced channel access probability.
Innovation Solution
The method determines a sub-band for uplink data transmission based on the sub-band corresponding to a configured Physical Uplink Control Channel (PUCCH) resource, using interlaced resource block indication information, even when sub-band indication is absent in scheduling information, thereby allowing uplink transmission without requiring successful LBT on all sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the protocol does not include sub-band indication field in DCI 0-0 scheduling information, then the scheduling information format is simplified, but the terminal cannot determine which sub-bands are for uplink transmission
Solution Approach 1:
The patent uses the PUCCH resource configuration as an intermediary to convey sub-band information. Instead of directly indicating sub-bands in the DCI, the PUCCH resource configuration serves as a mediator that implicitly indicates the sub-band through its frequency domain location, allowing the terminal to determine the sub-band without an explicit sub-band indication field in the DCI
Solution Approach 2:
The patent enables the PUCCH resource configuration to self-serve the dual purpose of both uplink control channel allocation and sub-band indication. The frequency domain location of the PUCCH resource inherently carries sub-band information, eliminating the need for separate sub-band indication mechanisms
2Reliability
If the terminal performs LBT on all sub-bands before uplink transmission, then the channel access is reliable, but the implementation complexity increases and channel access probability decreases
Solution Approach 1:
The patent segments the uplink transmission bandwidth into multiple sub-bands and allows the terminal to perform LBT independently on only the determined sub-band(s) rather than all sub-bands. This segmentation enables selective channel access, reducing the complexity and increasing the probability of successful channel acquisition
Solution Approach 2:
The patent applies different LBT requirements to different sub-bands based on the determined sub-band for uplink transmission. Instead of uniform LBT across all sub-bands, the terminal performs LBT only on the specific sub-band indicated by the PUCCH resource configuration, optimizing the channel access process
3Productivity
If the terminal performs LBT on multiple sub-bands for uplink transmission, then the resource utilization is improved, but the probability of successful channel competition is reduced
Solution Approach 1:
The patent applies partial action by having the terminal perform LBT only on the determined sub-band(s) rather than all available sub-bands. This partial approach to channel access maintains sufficient resource utilization while significantly improving the probability of successful channel competition by reducing the number of LBT attempts required
Data Source
AI summary
Provided in the present disclosure are a method for uplink data transmission, a terminal, and a readable storage medium. The method includes: receiving uplink resource scheduling information, where the uplink resource scheduling information includes frequency domain resource allocation information, and the frequency domain resource allocation information includes interleaved resource block indication information; determining a sub-band for the uplink data transmission, in response to the frequency resource allocation information not comprising sub-band indication information; determining a resource for the uplink data transmission, based on the sub-band for the uplink data transmission and the interlaced resource block indication information; and performing the uplink data transmission.