News Column

Patent Issued for Identifying Hand-Over Targets in Lightly Coordinated Networks

August 27, 2014



By a News Reporter-Staff News Editor at Telecommunications Weekly -- A patent by the inventors Richardson, Andrew (Cambridge, GB); Hou, Jindong (Cottenham, GB), filed on March 17, 2009, was published online on August 12, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8805371 is assigned to Airvana LP (Chelmsford, MA).

The following quote was obtained by the news editors from the background information supplied by the inventors: "Cellular wireless communications systems, for example, are designed to serve multiple wireless-enabled devices distributed over a large geographic area by dividing the area into regions called 'cells' or 'cell areas'. At or near the center of each cell area, a network-side access device (e.g., an access point or base station) is located to serve client devices located in the cell area and commonly referred to as 'access terminals' ('ATs') or user equipment ('UEs'). Examples of ATs or UEs include wireless-enabled devices such as cellular telephones, laptops, personal digital assistants (PDAs), and/or other user equipment (e.g., mobile devices). An access terminal generally establishes a call, also referred to as a 'communication session,' with an access point to communicate with other entities (e.g., servers) in the network.

"Mobile wireless cellular networks (e.g. UMTS/WCDMA) have been implemented and are in operation globally. However, the coverage of those 2G/3G macro networks is often poor which causes call disruption to customers at home and inside buildings. The home base station (sometimes referred to as Home NodeB ('HNB') or Femtocell Access Points 'FAP') is a solution to the indoor coverage problem providing complementary indoor coverage to 2G/3G macro networks for service continuity; moreover, it also acts as a new service platform to enable mobile wireless broadband applications and home entertainment.

"A common problem in a lightly coordinated cellular network (e.g., a macro-Femto mixed network) is that cells do not have sufficient and accurate knowledge about their neighbors. So, ambiguity is created in (target) cell identification for a UE in active mode which can disrupt activities such as hand-over towards FAPs. For example, such identification ambiguity may cause inaccuracy and excessive failures in hand-over attempts for a UE in active mode.

"Various proposals have been made concerning methods for hand-overs into Femto networks. The proposals include a method for identifying the hand-over target by using the Primary Scrambling Code (PSC), and a method for identifying the hand-over target by identifying an umbrella macro cell. However, many of these proposals are based on shared and ambiguous target identifiers and consequently still cause excessive hand-over failure and unwanted signaling. For instance, in some conventional systems, hundreds of simultaneous hand-ins are attempted in hopes of getting correctly identifying the desired target cell. This approach unnecessarily wastes network resources."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "In general, in some aspects, a method performed on a portable access terminal operating in an active mode includes detecting a presence of a personal base station. An encoded identification message transmitted from the personal base station is received, and the encoded identification message includes a unique identifier associated with the personal base station. The encoded identification message is decoded to extract the unique identifier, and the unique identifier is transmitted to a source network entity.

"Aspects can include one or more of the following features. The portable access terminal enters a compressed mode. Detecting includes detecting the presence of the personal base station by detecting a scrambling code of the personal base station. Detecting includes comparing a signal quality of the personal base station with a pre-determined threshold. The access terminal receives the encoded identification message over a channel status indicator channel (CSICH) from the personal base station. The portable access terminal transmits the unique identifier to the source network entity in a measurement report message (MRM) or a radio resource control message (RRC). The network is a circuit-switched network or a packet-switched network. Decoding includes partially decoding the encoded identification message and storing a partial result. The access terminal combines one or more partial results to form a full result.

"In general, in some aspects, a method includes detecting, by a portable access terminal, a presence of a personal base station. A portable access terminal receives an encoded identification message transmitted from the personal base station, and the encoded identification message includes a unique identifier associated with the personal base station. The encoded identification message is decoded on the portable access terminal to extract the unique identifier. The unique identifier is transmitted to a source network entity, and the source network entity determines whether to hand-over a session to the personal base station based on one or more predetermined factors.

"Aspects can include one or more of the following features. The source network entity transmits a relocation message to a target network entity, the relocation message being populated with the unique identifier. The source network entity verifies a validity of the unique identifier before populating the relocation message with the unique identifier.

"The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features and advantages will be apparent from the description and drawings, and from the claims."

URL and more information on this patent, see: Richardson, Andrew; Hou, Jindong. Identifying Hand-Over Targets in Lightly Coordinated Networks. U.S. Patent Number 8805371, filed March 17, 2009, and published online on August 12, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8805371.PN.&OS=PN/8805371RS=PN/8805371

Keywords for this news article include: Airvana LP.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Telecommunications Weekly


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