The patent's assignee for patent number 8654701 is Telefonaktiebolaget LM Ericsson (publ) (
News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to wireless telecommunication systems. More particularly, and not by way of limitation, the invention is directed to a method of supporting frequency-selective repeaters in a wireless telecommunication system.
"The following acronyms are used in the description herein:
"CQI Channel Quality Indicator
"DoA Direction of Arrival
"E-UTRAN Evolved UMTS Radio Access Network
"FDMA Frequency Division Multiple Access
"LTE Long Term Evolution
"MAC Medium Access Control
"MME Mobility Management Entity
"OFDM Orthogonal Frequency Division Multiplexed"
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Each of the three conventional alternatives for establishing the UE-repeater association relationships suffers from disadvantages. Alternative 1 requires the repeater to transmit an RS, which impacts the LTE standard and also creates backward-compatibility problems. Another disadvantage is that it increases the signaling overhead. Furthermore, the UE has to synchronize, identify, and perform measurements from multiple repeaters and the eNodeB, thus increasing the UE complexity.
"Alternative 2 creates a considerable burden in terms of control signaling and reporting because each repeater must report its measurement results, and the BS or eNodeB decides the association relationships between the UEs and the repeaters and informs each repeater about its relationship.
"Alternative 3 is unreliable because there are errors and delays in CQI reporting, and consequently the interference situation is different in the CQI state and the data transmission state. These differences may lead to the establishment of inappropriate UE-repeater associations.
"The present invention provides a method of supporting frequency-selective repeaters, which overcomes the shortcomings of the prior art. In an embodiment of the present invention, the BS or eNodeB classifies UEs into two categories or lists of users: a white list containing UEs that may need the assistance of repeaters, and a black list containing UEs that do not need repeater assistance. The eNodeB may broadcast one of these two lists depending on the number of UEs in each list. For example, if 90 percent of the UEs are on the black list, it is more efficient to transmit the black list. However, if 90 percent of the UEs are on the white list, it is more efficient to transmit the white list. The eNodeB should inform the repeaters which list is being broadcast. Each repeater then decides on its own whether to amplify signals for a given UE by listening to the broadcast information from the eNodeB and measuring signals from the UE.
"In one embodiment, the present invention is directed to a method of supporting frequency-selective repeaters in a wireless telecommunication system having a base station that serves a plurality of UEs and one or more frequency-selective repeaters that amplify and forward signals between the base station and a portion of the UEs. The method includes the steps of identifying by the base station, UEs for either a black list that identifies UEs for which signals are not to be amplified by a given repeater or a white list that identifies UEs for which signals are allowed to be amplified by the repeater; and ending the black list or white list from the base station to the repeater. The method also includes detecting by the repeater, an identity of a UE within the repeater's transmission range; determining whether the detected UE is on the black list or white list; and when the UE is on the black list, determining by the repeater that signals scheduled for the UE are not to be amplified. When the UE is on the white list, the repeater determines whether to amplify signals scheduled for the UE. The repeater may amplify signals for all white list UEs, or it may apply additional criteria.
"In another embodiment, the present invention is directed to a base station for supporting frequency-selective repeaters in a wireless telecommunication system, wherein the base station serves a plurality of UEs, and a frequency-selective repeater amplifies and forwards signals between the base station and a portion of the UEs. The base station includes a UE classifier for identifying UEs that either require or do not require amplification by the repeater; and an interface unit for notifying the repeater of the identified UEs. The UE classifier may place the UEs on either a black list that identifies UEs for which signals are not to be amplified by the repeater or a white list that identifies UEs for which signals are allowed to be amplified by the repeater
"In another embodiment, the present invention is directed to a frequency-selective repeater in a wireless telecommunication system for amplifying and forwarding signals between a base station and a plurality of UEs served by the base station. The repeater includes an interface unit for receiving a list of UEs from the base station; and means for amplifying and forwarding signals only to UEs identified by the received list. The repeater may include a list analyzer for determining whether the received list is a black list that identifies UEs for which signals are not to be amplified by the repeater or a white list that identifies UEs for which signals are allowed to be amplified by the repeater; and a UE classifier for determining which white list UEs should have their signals amplified."
For additional information on this patent, see: Kazmi, Muhammad; Gan, Jiansong; Baldemair, Robert; Zhang, Zhang. Creation and Signalling of UE Lists to Support Frequency Selective Repeater Operation. U.S. Patent Number 8654701, filed
Keywords for this news article include: Telecommunications, Telefonaktiebolaget LM Ericsson.
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