A network of modular, multitier pool mobile units, that wander around and under water of a swimming pool. The pool mobile units monitor for safety, emergency and accident related events and undertake appropriate actions to provide care and protection for swimmers, family members and bystanders. They scrub and clean the swimming pool bottom and wall surfaces and emit chemical agents to sanitize the swimming pool water. A central server provides safety monitoring, help for drowning swimmers, and emergency and accident supports.

The assembly described herein is secured to lawn equipment for adding additional functionality, such as weed eating. The assembly includes a base having at least one base bracket for selectively coupling the assembly to the lawn equipment. Further, a stem is included having a stem bracket coupled to the base, a stem housing extending from the stem bracket, and a shoulder in rotational engagement with the stem housing. For maneuvering the assembly, an arm is pivotally engaged with the shoulder of the stem and pivotally coupled to the arm actuator. The arm may be radially, angularly and translatably repositioned during use.

The assembly described herein is secured to lawn equipment for adding additional functionality, such as weed eating. The assembly includes a base having at least one base bracket for selectively coupling the assembly to the lawn equipment. Further, a stem is included having a stem bracket coupled to the base, a stem housing extending from the stem bracket, and a shoulder in rotational engagement with the stem housing. For maneuvering the assembly, an arm is pivotally engaged with the shoulder of the stem and pivotally coupled to the arm actuator. The arm may be radially, angularly and translatably repositioned during use.

A vegetation trimming assembly for cutting vegetation while mowing includes a rod. A grip, a first plate, a pipe, a cutting head, and a power module are coupled to the rod. The grip extends substantially perpendicularly, the first plate extends substantially linearly, and the pipe extends transversely from proximate to a first end of the rod. The cutting head, which is operationally coupled to the power module, is coupled to a second end of the rod. The pipe is configured to be rotationally coupled proximate to a steering assembly a mowing vehicle. The grip is configured to be grasped in a hand of a user so that the first plate is configured to support a forearm of the user. The pipe is configured to be selectively rotated, relative to the mowing vehicle, to position the cutting head proximate to the vegetation to sever the vegetation.

A network of modular, multitier pool mobile units, that wander around and under water of a swimming pool. The pool mobile units monitor for safety, emergency and accident related events and undertakes appropriate actions, scrub and clean the swimming pool, emit chemical agents to sanitize the swimming pool water, and may play music. The pool mobile units may simply operate on the pool surface, be fully submersible, or semisubmersible. A central server manages a plurality of multitier pool mobile units in a plurality of swimming pools, supports music download, and provides experience based resources for the multitier pool mobile units. The central server provides experience based resources in the form of safety, emergency and accident supports. The user can configure the parameters of both pool mobile unit and the central server.

One apparatus for providing high-resolution CSI feedback includes a processor and a radio transceiver. The processor computes sets of amplitude and phase parameters for one or more matrices corresponding to a CSI codebook. Here, each matrix corresponds to one transmission layer of a multiple-layer transmission, where each matrix is comprised of one or more column vectors. The radio transceiver sends indications of the sets of amplitude and phase parameters to one or more network entities is a mobile communication network.

One apparatus for providing high-resolution CSI feedback includes a processor and a radio transceiver. The processor computes sets of amplitude and phase parameters for one or more matrices corresponding to a CSI codebook. Here, each matrix corresponds to one transmission layer of a multiple-layer transmission, where each matrix is comprised of one or more column vectors. The radio transceiver sends indications of the sets of amplitude and phase parameters to one or more network entities is a mobile communication network.

A green area maintenance system, includes: an autonomous mobile green area maintenance robot having a treatment tool, a cutting tool differing from the treatment tool, wherein the green area maintenance robot and the cutting tool are configured to allow fixing of the cutting tool to the green area maintenance robot, a user control device, an autonomous operation mode and a cutting operation mode, wherein in the autonomous operation mode the autonomous mobile green area maintenance robot with its treatment tool operates autonomously and the cutting tool is set out of operation, and wherein in the cutting operation mode the cutting tool is fixed to the green area maintenance robot and operable. The green area maintenance robot with its treatment tool and the cutting tool are controlled by a user via the user control device, and an operation mode switching device for switching between the autonomous operation mode and the cutting operation mode.

A autonomous mobile green area maintenance robot, includes: a first motor-driven treatment tool, a second motor-driven treatment tool differing from the first treatment tool, and an open protective housing with a lateral rim. The first treatment tool defines a first treatment zone and is arranged within the protective housing such that the first treatment zone is located in a safety zone of the protective housing. The safety zone has a safety distance to the lateral rim. The second treatment tool defines a second treatment zone, wherein the second treatment zone is located at least partially beyond the safety zone. The autonomous mobile green area maintenance robot has an autonomous operation mode, wherein in the autonomous operation mode, a maximum kinetic energy of the second motor-driven treatment tool is smaller than a maximum kinetic energy of the first motor-driven treatment tool.

A autonomous mobile green area maintenance robot, includes: a first motor-driven treatment tool, a second motor-driven treatment tool differing from the first treatment tool, and an open protective housing with a lateral rim. The first treatment tool defines a first treatment zone and is arranged within the protective housing such that the first treatment zone is located in a safety zone of the protective housing. The safety zone has a safety distance to the lateral rim. The second treatment tool defines a second treatment zone, wherein the second treatment zone is located at least partially beyond the safety zone. The autonomous mobile green area maintenance robot has an autonomous operation mode, wherein in the autonomous operation mode, a maximum kinetic energy of the second motor-driven treatment tool is smaller than a maximum kinetic energy of the first motor-driven treatment tool.