Two-Stage Uplink Grant Procedure for 5G Wireless
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Solution Overview
Problem
Wireless communication systems face inefficiencies in two-stage uplink grant procedures, particularly in 5G systems, where delays between receiving a downlink grant and transmitting uplink data lead to reduced access to shared wireless communication bands due to interference from neighboring nodes.
Innovation Solution
Implementing a two-stage uplink grant procedure where a first uplink grant provides transmission parameters, allowing user equipment (UE) to prepare data, and a second grant serves as a trigger for transmission, enabling UE to determine a starting delay for efficient access to the wireless medium, potentially using listen-before-talk (LBT) procedures to minimize latency and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single uplink grant is used for data transmission, then the procedure is simple, but the delay between grant reception and data transmission is too long, reducing access to wireless medium
Solution Approach 1:
The patent divides the single uplink grant into two separate grants: a first uplink grant that provides transmission parameters and a second uplink grant that triggers actual data transmission. This segmentation allows the UE to prepare data in advance using the first grant, then quickly transmit using the second grant, reducing overall delay while maintaining procedural clarity through separation of concerns.
Solution Approach 2:
The first uplink grant enables the UE to perform preliminary actions by providing transmission parameters in advance, allowing the UE to prepare and buffer data before the actual transmission trigger. This preliminary preparation reduces the delay between final grant reception and data transmission by having data ready to go.
2Manufacturing precision
If the delay for decoding downlink control information and preparing uplink data is increased, then data preparation is more thorough, but interfering neighbor nodes can gain access to the wireless medium first
Solution Approach 1:
By segmenting the grant procedure into two stages, the patent allows thorough data preparation during the first stage without blocking the transmission trigger. The second grant acts as an independent trigger that can be received and processed quickly, ensuring the UE maintains reliable access to the wireless medium while still having time for quality data preparation in the first stage.
Solution Approach 2:
The first uplink grant provides transmission parameters that enable preliminary data preparation and buffering. This preliminary action allows the UE to prepare data thoroughly before the second grant triggers transmission, ensuring both preparation quality and timely medium access by separating preparation time from transmission trigger time.
3Ease of operation
If conventional one-stage or two-stage uplink grants are used, then the basic transmission function is achieved, but communication efficiency on shared wireless band is reduced
Solution Approach 1:
The patent segments the uplink grant into two functional parts: the first grant for parameter configuration and the second grant for transmission triggering. This segmentation enables the UE to efficiently prepare data in parallel while maintaining simple operation, thereby improving communication efficiency on shared wireless bands without complicating the basic transmission function.
Solution Approach 2:
The first uplink grant enables preliminary data preparation and buffering using provided transmission parameters. This preliminary action allows the UE to be ready for rapid transmission when the second grant triggers, improving communication efficiency by reducing the time between grant reception and actual data transmission, while keeping the basic transmission function easy to operate.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for encoding uplink data for transmission based on control information included in a first uplink grant corresponding to a first set of uplink resources, receiving a second uplink grant associated with a second set of uplink resources, wherein the second uplink grant is associated with the encoded uplink data for transmission, determining a starting time (e.g., a first delay or a second delay) for the second set of uplink resources based at least in part on a timing of the encoding with respect to the second uplink grant, and transmitting uplink data during the second set of uplink resources based on the determined starting time.