UE Cross-Frequency Resource Signaling for V2X Half-Duplex Limits
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Solution Overview
Problem
The limitations of UE transceiving capability in LTE systems due to half-duplex operation and insufficient CCs for simultaneous reception or transmission, leading to missed data and underutilized spectrum resources, especially in V2X services requiring multiple CCs.
Innovation Solution
A method for cross-frequency resource allocation and reservation, allowing a UE to perform sensing and blind detection on one frequency to obtain resource allocation results on other frequencies, thereby optimizing transceiving capabilities and avoiding conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs independent sensing and blind detection on multiple component carriers, then the UE can obtain resource allocation information on each CC, but transceiving conflicts occur due to half-duplex operation mode limiting simultaneous reception and transmission
Solution Approach 1:
The patent segments the resource sensing process by frequency band. The receiving UE performs sensing and blind detection on a first frequency band, while the transmitting UE transmits resource allocation information for a second frequency band. This segmentation allows different frequency bands to be handled independently, avoiding transceiving conflicts within the same band while maintaining multi-band resource utilization.
Solution Approach 2:
The patent introduces an intermediary mechanism where the transmitting UE acts as a mediator by providing resource allocation information for the second frequency band through resource indication information. This intermediary approach allows the receiving UE to obtain resource allocation details without needing to perform independent sensing on all frequency bands, thereby reducing the sensing load and avoiding transceiving conflicts.
2Quantity of substance
If the number of configured CCs exceeds the UE's simultaneous reception/transmission capability, then spectrum resources are underutilized, but the UE cannot make full use of all available spectrum resources
Solution Approach 1:
The patent implements a universal resource allocation mechanism where resource indication information can represent resource allocations across multiple frequency bands. The resource indication information includes both frequency domain resource allocation information and time domain resource allocation information, enabling a single signaling structure to universally indicate resources across different CCs, thereby improving spectrum utilization without requiring separate sensing procedures for each band.
Solution Approach 2:
The patent adds a cross-frequency dimension to resource allocation by allowing resource indication information to span multiple frequency bands. Instead of confining resource allocation to a single CC, the system enables resource indication across frequency bands, effectively utilizing the frequency dimension to expand resource availability beyond the UE's simultaneous reception/transmission capabilities.
3Reliability
If the UE monitors basic services on some CCs for a long time due to insufficient simultaneous reception/transmission CCs, then advanced V2X services with low latency requirements fail
Solution Approach 1:
The patent applies preliminary action by having the transmitting UE pre-calculate and indicate resource allocations for multiple frequency bands before actual transmission. The resource indication information is provided in advance, allowing the receiving UE to prepare for reception on appropriate frequency bands without needing to continuously monitor all CCs, thereby reducing latency for time-sensitive services while maintaining basic service reliability.
Data Source
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AI summary
Embodiments of the present disclosure disclose a method for communication between user equipments and a user equipment. The method includes: determining, by a user equipment (UE), a physical control channel resource of a first frequency; and transmitting, by the UE, first control information on a physical control channel of the first frequency; wherein the first control information includes frequency indication information and/or resource indication information of a second frequency, the frequency indication information of the second frequency is used to indicate the second frequency, and the resource indication information of the second frequency is used to indicate an allocated/reserved resource of the second frequency.