Uplink Scheduling Request Resource Allocation Latency
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Solution Overview
Problem
In LTE systems, terminals face high data transmission latency due to limited pre-allocated time-frequency resources for uplink scheduling requests, leading to either prolonged wait times or resource wastage with excessive allocation.
Innovation Solution
A terminal determines and uses an idle or common time-frequency resource, potentially occupied by another signal, to send its own signal orthogonally, thereby reducing the need to wait for network-allocated resources and minimizing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a small quantity of time-frequency resources is pre-allocated to the terminal for sending uplink scheduling requests, then resource waste is reduced, but data transmission latency increases significantly
Solution Approach 1:
The patent applies dynamics by enabling the terminal to dynamically select from multiple pre-configured time-frequency resources based on current channel conditions and traffic requirements, rather than using a static single resource allocation. This allows the system to adapt resource usage in real-time, reducing both latency and waste.
Solution Approach 2:
The patent changes the parameter of time-frequency resource allocation by pre-configuring multiple resources with different characteristics (e.g., different time slots, frequency positions) and allowing the terminal to select the most appropriate one based on current conditions, thereby optimizing both latency and resource utilization.
2Loss of time
If a large quantity of time-frequency resources is pre-allocated to the terminal for sending uplink scheduling requests, then data transmission latency is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements partial action by pre-configuring multiple time-frequency resources but only activating/selecting the necessary portion based on actual transmission needs. The terminal does not continuously use all pre-configured resources, but rather selects only what is needed at each moment, reducing waste while maintaining low latency.
Solution Approach 2:
The patent applies universality by designing the pre-configured time-frequency resources to serve multiple purposes: they can be used for scheduling requests, for uplink data transmission, and can be shared across different terminals. This multi-functionality improves overall resource utilization while maintaining fast access for urgent transmissions.
3Device complexity
If the terminal waits for network-allocated time-frequency resources to send uplink scheduling requests, then resource allocation control is improved, but transmission speed and productivity decrease
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple time-frequency resources for the terminal before actual transmission occurs. When the terminal needs to send an uplink scheduling request, it can immediately use one of the pre-configured resources without waiting for dynamic network allocation, thereby significantly reducing transmission delay while the network retains overall control through the pre-configuration process.
Data Source
AI summary
Example methods and apparatus for sending a signal are described. One method includes determining a to-be-sent first signal by a first terminal and determining a first time-frequency resource. Some or all of the first time-frequency resource are second time-frequency resources, and the second time-frequency resource is a time-frequency resource used to send a second signal. The first signal is sent by the first terminal by using the first time-frequency resource, where the first time-frequency resource includes an idle time-frequency resource that is not occupied by the second signal. The first time-frequency resource can also include a common time-frequency resource occupied by the second signal, and the first signal is orthogonal to the second signal in the common time-frequency resource.