Grant-less Uplink Control Information for MulteFire Channel Access
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting high data rates and mobility due to limitations in uplink performance, particularly in Licensed-Assisted Access (LAA) systems, where listen before talk (LBT) procedures lead to reduced channel occupancy times and increased latency, necessitating the introduction of grant-less uplink (GUL) transmissions to enhance hybrid automatic repeat request (HARQ) processes and improve downlink/uplink performance.
Innovation Solution
The implementation of grant-less downlink control information (G-DCI) that includes uplink HARQ acknowledgments/negative acknowledgments, dynamic transport block scaling, and flexible modulation and coding schemes, allowing User Equipment (UE) to autonomously initiate uplink transmissions without explicit grants from the eNodeB, thereby optimizing channel occupancy and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen before talk (LBT) procedures are implemented in LAA systems, then channel access reliability is improved, but channel occupancy time is reduced and latency is increased
Solution Approach 1:
The system performs listen before talk (LBT) procedures in advance before actual data transmission, allowing the UE to secure channel access rights beforehand. This preliminary channel access preparation enables the UE to maintain channel occupancy for a predetermined period without needing continuous LBT checks, thus resolving the contradiction between ensuring reliable channel access and maintaining sufficient channel occupancy time.
2Reliability
If listen before talk (LBT) procedures are implemented in LAA systems, then channel access reliability is improved, but transmission latency is increased
Solution Approach 1:
The LBT procedure is executed in advance to secure channel access rights before data transmission begins. By performing the channel access check preliminarily and granting the UE channel occupancy rights for a predetermined period, the system eliminates the need for repeated LBT checks during data transmission, thereby reducing overall transmission latency while maintaining reliable channel access.
3Reliability
If grant-based uplink transmissions are used, then channel access control is improved, but HARQ process speed is reduced
Solution Approach 1:
The patent extracts and separates the channel access control function from the data transmission process. The network device grants channel access rights and configures uplink resources in advance through downlink control information, allowing the UE to autonomously perform uplink transmissions without seeking continuous grants. This separation enables faster HARQ processes while maintaining reliable channel access control through the preliminary grant mechanism.
4Productivity
If grant-less uplink (GUL) transmissions are implemented, then HARQ process speed is improved, but channel access control complexity is increased
Solution Approach 1:
The network device performs preliminary channel access control by granting uplink channel access rights and configuring resources in advance through downlink control information. This preliminary configuration allows the UE to autonomously conduct GUL transmissions without real-time grant requests, achieving fast HARQ processes while centralizing the control complexity in the network device rather than the UE.
Data Source
AI summary
Technology for a user equipment (UE) operable to decode grant less downlink control information (G-D 5 CI) received from a Next Generation NodeB (gNB) is disclosed. The UE can decode the G-DCI received from the gNB in a MulteFire system. The UE can identify grant less uplink DCI components included in the G-DCI. The UE can perform a grant less uplink transmission with the gNB based on the grant less uplink DCI components in the G-DCI received from the gNB.