DMTC Window Reservation Signal for NR Shared Spectrum Interference
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Solution Overview
Problem
In wireless communication networks, especially in shared spectrum environments like 5G NR, interference and communication inefficiencies arise due to the need for multiple network operating entities to contend for shared resources, leading to increased signaling overhead and latency.
Innovation Solution
Implementing a method where UEs receive a semi-persistent reservation signal during a DMTC window, re-transmit it with an offset period, and engage in communication within a CET period, while base stations reserve transmission periods and transmit control signals during the DMTC window, allowing for prioritized access and reduced interference by silencing potential jammers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple network operating entities contend for shared spectrum resources using medium sensing procedures, then spectrum sharing is enabled, but interference and communication latency increase
Solution Approach 1:
The patent applies preliminary action by implementing a reservation signal mechanism where network entities transmit reservation signals before actual data transmission to pre-secure channel access. This allows the system to establish transmission rights in advance, avoiding the need for continuous medium sensing during data transmission and reducing interference with other systems.
2Reliability
If medium sensing procedures are performed before each transmission, then channel availability is verified, but signaling overhead and latency increase
Solution Approach 1:
The invention performs channel availability verification in advance by transmitting reservation signals that secure channel access for future transmissions. This preliminary action eliminates the need for repeated medium sensing procedures before each data transmission, significantly reducing signaling overhead and latency while maintaining reliable channel availability verification.
3Reliability
If reservation signals are transmitted frequently to maintain channel reservation, then channel access is secured, but energy consumption increases
Solution Approach 1:
The patent implements periodic action by transmitting reservation signals at specific intervals rather than continuously or before every transmission. The system reserves channels for predetermined durations and refreshes reservations periodically, which secures channel access reliably while significantly reducing energy consumption compared to frequent or continuous reservation signal transmission.
Data Source
AI summary
A discovery measurement timing configuration (DMTC) window reservation signal is disclosed for new radio (NR) shared spectrum (NR-SS) networks. The DMTC window is defined providing a reserved location for transmission of essential control signaling and potentially high priority traffic that may be transmitted in a prioritized manner. Access within the DMTC window may be provided with a clear channel assessment (CCA) exempt transmission (CET) option or a non-CET option. When the CET option is used, the reservation duration and period may be conveyed through the channel reservation signal. User equipments (UEs) that detect the reservation signal may re-transmit with added offset to inform neighboring base station that may not be within range of the serving base station. Base station that receive either the transmitted or re-transmitted reservation signal will refrain from communications that may interfere with the reception at the UEs.