The assignee for this patent, patent number 8509166, is
Reporters obtained the following quote from the background information supplied by the inventors: "Long term evolution (LTE) is a high performance radio interface for cellular mobile communication systems. LTE boasts of performance peak rates of at least 100 Mbps for the downlink transmissions, 50 Mbps for the uplink transmissions, and radio access network round trip times less than 10 ms. It has the advantage of high throughput, low latency, and a simple architecture with low operating costs.
"The allocation of resources, such as scheduling and transmit power, in a radio network has a significant impact on the performance of a wireless communication system. Scheduling pertains to the allocation of a time and frequency unit to a mobile station. Power allocation pertains to setting transmit power levels in an efficient manner. The allocation of the transmit power determines the data rate of transmission to a scheduled mobile station. The manner in which these resources are allocated affects the overall throughput and transmission rates that can be achieved.
"Conventional resource allocation techniques are not suitable for a LTE network. The conventional techniques typically schedule in units that contain a signal subcarrier and one time slot. The basic radio resource in LTE is a Physical Resource Block (PRB) which contains a group of subcarriers and time slots. User scheduling in LTE networks is performed through the allocation of a PRB rather than through the allocation of a single subcarrier and time slot. This makes user scheduling in a LTE network more complex and computationally burdensome.
"Additionally, existing resource allocation techniques typically focus on maximizing the total network throughput or system capacity. The notion of fairness or fair resource allocation among users is often not considered which can result in sacrificing the transmission of other users. Accordingly, there is a need for a more efficient resource allocation."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "This Summary is provided to introduce a selection of concepts in a simplified form that are further described in the Detailed Description below. This Summary is not intended to identify essential features of the invention or claimed subject matter, nor is it intended to be used in determining the scope of the claimed subject matter.
"The present invention pertains to a technology for power control and scheduling in a LTE network integrated with femtocells under the constraints of a quality of service using fairness objectives. The technology utilizes a tri-phase approach which includes a LTE air interface model procedure, a resource scheduling and power allocation procedure, and a discrete event simulation procedure.
"The LTE air interface model is a stochastic geometric model of an exemplary radio network including different propagation scenarios, physical propagation characteristics, and conditions encountered by a radio network in the field. A stochastic geometric framework is used to model the random spatial distribution of users, femtocells, and buildings. After deployment, the physical channel attenuations are generated for each time slot and subcarrier to capture antenna sectoring, path loss, shadow fading, and multi-path fading for the modeled network scenarios. The model produces a channel attenuation matrix H.sub.b.sub.i.sub., i, t, f that captures the channel attenuation for each channel (b.sub.i,i) at each PRB (t, f).
"The resource scheduling and power allocation procedure determines a near optimal assignment of users to physical resource blocks (PRBs) and the transmit power for each scheduled user. The user scheduling and power allocation assignment is decomposed into two separate problems that are solved simultaneously. Power allocations are made using a water-filling technique with fixed scheduling. The scheduling is then updated to maximize the data rates while meeting fairness constraints.
"The discrete event simulation model simulates the end-to-end packet-by-packet transmissions throughout the entire network so that the performance of the network can be analyzed. The analysis studies the network throughput, delays; and the parameters impacting these factors.
"Design tradeoffs can be made to the LTE air interface model and the entire process rerun so that the effects of the design can be more thoroughly studied in a simulated network environment. These studies are useful for the planning and design of LTE network architectures integrated with femtocells."
For more information, see this patent: Kerpez, Kenneth J.; Lan, Tian; Sinkar, Kaustubh;
Keywords for this news article include: Technology,
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