D2D Resource Allocation via Hopping Patterns
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Solution Overview
Problem
In wireless communication systems supporting D2D communication, there is a challenge in efficiently utilizing resources for transmitting control information and data between transmission and reception UEs, leading to unnecessary battery consumption due to blind decoding of all resources predetermined by the base station.
Innovation Solution
A method where the transmission UE receives resource allocation information from the base station and transmits control information and data to the reception UE, using a prescribed time domain pattern and a frequency domain location determined by specific hopping patterns based on UE attributes, allowing for efficient resource utilization and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station predetermines all resources for D2D communication, then resource allocation is simplified, but the receiving UE experiences unnecessary battery consumption due to blind decoding of all resources
Solution Approach 1:
The resource pool is segmented into two distinct parts: semi-static resources for control information (SA) and dynamic resources for data transmission. This segmentation allows the receiving UE to separately monitor SA resources (reducing blind decoding) while still accessing data when needed, thus resolving the contradiction between simplified allocation and energy consumption.
Solution Approach 2:
The transmitting UE performs preliminary action by transmitting SA on semi-static resources before actual data transmission. The SA contains resource allocation information that enables the receiving UE to identify and access only the necessary dynamic resources, preventing the receiving UE from blindly decoding all predetermined resources and reducing battery consumption.
2Reliability
If the transmission UE uses hopping patterns for frequency domain location, then interference is reduced and resource utilization is improved, but the system complexity increases
Solution Approach 1:
The system employs dynamic frequency hopping patterns for SA transmission, where the frequency domain location changes according to predefined patterns based on subframe index and UE identifiers. This dynamic approach reduces interference and improves reliability while the patent manages complexity by using standardized hopping formulas and semi-static resource configuration.
Solution Approach 2:
The hopping pattern parameters (such as frequency offset, hopping distance) are changed based on UE-specific identifiers and subframe indices, allowing the system to achieve diverse resource allocation and interference reduction. The patent manages complexity by deriving these parameters from existing UE parameters rather than introducing new complex configuration mechanisms.
Data Source
AI summary
The present specification relates to a method in which a base station efficiently notifies a transmitting terminal of a resource domain for transmitting control information and data in a wireless communication system supporting device-to-device (D2D) communication. To this end, the transmitting terminal receives resource allocation information associated with D2D communication from the base station, and transmits, to a receiving terminal, control information (SA) for D2D communication and data corresponding to the SA on the basis of the resource allocation information received from the base station, wherein a time domain location for transmitting the SA has a predetermined time domain pattern on the basis of the resource allocation information received from the base station, and a frequency domain location for transmitting the SA can be determined in advance by one of two specific hopping patterns.