Channel Multiplexing for Narrowband LTE Resource Utilization
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Solution Overview
Problem
Narrowband LTE communication systems, such as Cat-M1, face inefficiencies in radio resource utilization due to repetitive data transmissions by User Equipment (UEs), which prevent other UEs from transmitting, leading to delayed transmissions and suboptimal use of available resources.
Innovation Solution
Implementing channel multiplexing and orthogonal patterns for UEs to share the same set of radio resources, allowing multiple UEs to transmit repetitive data simultaneously, while using interference cancellation schemes to manage mobility and reduce scheduling interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single UE uses a given set of radio resources for repetitive data transmission, then transmission reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent combines multiple UEs' repetitive transmissions onto the same radio resources by introducing orthogonal patterns. Multiple UEs are merged into a single resource allocation, with their signals distinguished by orthogonal codes, thereby improving resource utilization while maintaining reliable reception through the base station's ability to separate the combined signals.
Solution Approach 2:
The patent adds an orthogonal code dimension to the existing time-frequency resource allocation. Instead of allocating separate time-frequency resources to each UE, the invention introduces orthogonal patterns as an additional dimension, allowing multiple UEs to share the same time-frequency resources while remaining distinguishable through their unique orthogonal codes.
2Productivity
If multiple UEs share the same radio resources simultaneously, then resource utilization efficiency is improved, but interference management complexity increases
Solution Approach 1:
The patent changes the signal parameters by applying orthogonal codes to each UE's transmission. This parameter transformation allows the base station to separate signals through correlation detection, converting a complex multi-user detection problem into a simpler process of matching received signals against known orthogonal patterns.
3Productivity
If orthogonal patterns are assigned to multiple UEs, then uplink capacity is increased, but scheduling complexity increases
Solution Approach 1:
The patent segments the orthogonal code resource space into multiple groups, with each group assignable to a UE. This segmentation allows the base station to manage orthogonal pattern assignments in a structured manner, reducing scheduling complexity by organizing the available orthogonal codes into manageable groups rather than dealing with the entire code space at once.
Data Source
AI summary
A base station may include one or more processors to receive repetitive data transmitted using a set of subcarriers of a physical resource block (PRB); apply a first orthogonal pattern, assigned to a first user equipment (UE), to a segment of subframes of the received repetitive data; apply a second orthogonal pattern, assigned to a second UE, to the segment of subframes of the received repetitive data, the second orthogonal pattern being different from the first orthogonal pattern; determine first repetitive data, transmitted by the first UE using the set of subcarriers, based on applying the first orthogonal pattern to the segment of subframes of the received repetitive data; and/or determine second repetitive data, transmitted by the second UE using the set of subcarriers, based on applying the second orthogonal pattern to the segment of subframes of the received repetitive data.