Scheduling Request Transmission via Semi-Persistent Resources
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, the existing method for setting up connections for data transmission is inefficient, leading to high latency due to the need for RRC and S1 connection setups, which is ineffective for large data transmissions and increases overhead, especially when UEs are in an idle state.
Innovation Solution
The proposed method allows for scheduling requests to be transmitted within an uplink data channel using semi-persistent scheduling (SPS) resources, enabling low latency and high reliability communication by differentiating power levels and modulation schemes for scheduling requests and uplink data, and omitting the need for buffer status reports (BSR) by sharing scheduling priority and data size information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection setup (RRC and S1) is performed before data transmission, then communication reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring SPS resources and SR resources in advance through RRC connection setup, so that when data needs to be transmitted, the UE can immediately use the pre-allocated resources without performing connection setup. The RRC connection and S1 connection are established beforehand, and SPS/SR resources are pre-configured, enabling fast data transmission without additional setup latency.
2Productivity
If SPS resource is allocated for uplink data transmission, then transmission efficiency is improved, but scheduling request resource management becomes complex
Solution Approach 1:
The patent segments the SPS resource into two distinct parts: SPS resource for uplink data transmission and SR resource for scheduling requests. The base station allocates these separately through different indicator fields (first indicator for SPS, second indicator for SR), allowing independent management and control of each resource type, thereby simplifying the overall resource management complexity.
Solution Approach 2:
The patent applies local quality by assigning different properties to different parts of the allocated resource. The SPS resource has data transmission properties while the SR resource has control signaling properties. This differentiation allows each resource to be optimized for its specific purpose, with appropriate power levels, modulation schemes, and management procedures tailored to each function.
3Adaptability or versatility
If scheduling request is transmitted in separate control channel, then resource allocation flexibility is improved, but resource overhead increases
Solution Approach 1:
The patent merges the scheduling request resource with the SPS resource allocation. Instead of allocating completely separate resources for SR and uplink data, the SR resource is configured as part of the SPS resource through L1 or L2/L3 signaling. This combining reduces overall resource overhead while maintaining the flexibility to independently activate/deactivate SR functionality when needed.
Data Source
AI summary
Provided are a method and device for transmitting a scheduling request in a wireless communication system. In detail, a terminal receives, from a base station, resource allocation information for indicating a semi-persistent scheduling request and a scheduling request resource. The terminal receives, from the baste station, a first indicator for indicating whether the semi-persistent scheduling resource is activated and a second indicator for indicating whether the scheduling request resource is activated. The terminal determines whether the scheduling request can be transmitted on the basis of the first indicator and the second indicator. The terminal transmits the scheduling request to the base station via the scheduling request resource indicated by the resource allocation information.