Uplink Resource Signaling for Mixed LTE Terminal Capabilities
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The LTE system struggles to accommodate terminals with varying capabilities, leading to issues in receiving synchronization and broadcast channels, and thus, effective communication is hindered due to the lack of support for scheduling single subcarriers or multiple subcarriers, particularly for terminals supporting type 1 and type 2 capabilities.
Innovation Solution
A data transmission method and apparatus that provides first and second indication information to differentiate between type 1 and type 2 uplink resources, allowing terminals to send uplink data or control information on appropriate resources based on their capabilities, using SC-FDMA or FDMA with specific subcarrier or sub-channel configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LTE system uses a fixed scheduling granularity of one PRB (180 KHz), then the system structure remains simple and standardized, but it cannot accommodate terminals with varying capabilities (type 1, type 2, type 3) that require different subcarrier spacings and resource granularities
Solution Approach 1:
The patent segments the uplink resource into two distinct types: type 1 uplink resource with 3.75 kHz subcarrier spacing for type 1 terminals, and type 2 uplink resource with 15 kHz subcarrier spacing for type 2 and type 3 terminals. This segmentation allows each terminal type to use resources optimized for its capabilities while maintaining overall system compatibility.
Solution Approach 2:
The patent introduces dynamic resource allocation where the network can flexibly assign type 1 or type 2 uplink resources based on terminal capability and service requirements. The scheduling granularity dynamically adapts between 3.75 kHz and 15 kHz subcarrier spacings, enabling the system to optimize resource usage for different terminal types without fixed constraints.
2Adaptability or versatility
If the LTE system supports multiple terminal capabilities with different subcarrier spacings, then terminal adaptability improves, but the smallest scheduling granularity increases from 1 PRB to potentially single subcarrier level
Solution Approach 1:
The patent divides uplink resources into type 1 and type 2 categories with clearly defined subcarrier spacing differences. Type 1 resources use 3.75 kHz spacing suitable for single subcarrier transmission, while type 2 resources use 15 kHz spacing for multi-subcarrier transmission. This segmentation simplifies the scheduling complexity by providing clear resource type distinctions.
Solution Approach 2:
Different regions of the frequency spectrum are allocated different subcarrier spacings based on local terminal capability requirements. Terminals with type 1 capability receive 3.75 kHz spaced resources, while type 2 and type 3 terminals receive 15 kHz spaced resources, optimizing each terminal's performance for its specific capability level.
3Ease of operation
If the LTE system maintains a fixed 180 KHz frequency resource granularity, then resource management remains straightforward, but terminals with type 1 and type 2 capabilities cannot receive synchronization or broadcast channel information
Solution Approach 1:
The system dynamically adjusts the uplink resource granularity from the fixed 180 KHz PRB level to variable levels including single subcarrier (3.75 kHz) and multi-subcarrier configurations (15 kHz). This dynamic adjustment enables terminals with type 1 and type 2 capabilities to properly receive and process synchronization and broadcast channel information while maintaining straightforward resource management through type-based classification.
Data Source
AI summary
Embodiments of the present invention provide a data transmission method and an apparatus, and relate to the field of communications technologies. The method includes: obtaining, by a terminal, first indication information of an uplink resource used for sending uplink data or uplink control information. The first indication information of the uplink resource includes information used to indicate whether the uplink resource is a type 1 uplink resource or a type 2 uplink resource. The type 1 uplink resource includes at least one subcarrier in a frequency domain, where when a subcarrier quantity is greater than or equal to 2, subcarriers are orthogonal to each other, and a subcarrier spacing is 3.75 kHz; or the type 1 uplink resource includes at least one sub-channel in a frequency domain, where a bandwidth of each sub-channel is 3.75 kHz.