Telefonaktiebolaget Lm Ericsson (publ)

Ericsson Gmbh

Francois Sawyer

Alex Krister Raith

John Walter Diachina

Bengt Y Persson

Anthony J Sammarco

Eric Turcotte

Francis Lupien

Hangkan C Andersson

Andre Beliveau

Ray Henry

Paul Wilkinson Dent

Nils Rutger Rydbeck

Roland Stig Bodin

Knut Magnus Almgren

Carl Magnus Frodigh

Joseph Eric Turcotte

Anders C Hoff

Sylvain Labonte

Hangkan Gunnar Olofsson

Wayne S Tom

H&aring;kan Clas Andersson

Kenneth Yngve Wallstedt

Jean-Pierre Brochu

Patrice Marsolais

Sylvain St-Pierre

A Krister Raith

Christer Palmgren

Janice Wong

Hakan Clas Andersson

Claes Hans Andersson

The method and device attenuate an interferer of substantially known spectrum in a communication signal which has been transmitted through a transmission channel and processed through a signal-processing receiver chain. In these method and device, the substantially known spectrum is used to generate, independently of the communication signal, at least one image representative of a replica of the interferer after processing through the signal-processing receiver chain. The generated image is subtracted from the processed communication signal to produce a subtraction signal, and quality-indicative parameters of the processed communication signal and the subtraction signal(s) are calculated. Finally, the quality-indicative parameters are used to select one of the processed communication signal and subtraction signal(s) for further processing through the receiver. When a plurality of images are generated, these images have different features, for instance different amplitudes or phases. At least one image can be feedback controlled in relation to the quality-indicative parameter of the subtraction signal corresponding to this image, in view of improving the quality-indicative parameter of this subtraction signal. This feedback control can also be responsive to the signal selection to improve the quality-indicative parameter of the subtraction signal until the latter signal is selected for further processing through the receiver.

Method and device for attenuating an interferer from a communication signal

A method and system for locating control channels, particularly digital control channels, are described. By grouping the channels which are candidates for carrying supervisory messages in blocks indicative of their relative likelihood for being used as control channels, a mobile station can begin its search for a control channel with channels which are most likely to actually be control channels. Placing location information on other channels allows the mobile station to be redirected to a control channel when it reads one of these other channels. Similarly, by placing information describing the location of a control channel in a message associated with handoff, a mobile station avoids the necessity of having to relocate a new control channel associated with the base station to which the mobile has been handed off.

Method and apparatus for distinguishing between a digital control channel and a digital traffic channel in a radiocommunication system

A system in a telecommunications network for providing selected advertisements to subscribers utilizing display screens to conduct a video telephone call. The system comprises a centralized database of subscriber advertising preferences, an information source, a calling subscriber's switch connected to the database and the information source, and a called subscriber's switch connected to the calling subscriber's switch. The database of subscriber advertising preferences stores advertising preferences for subscribers in the network, and is updated whenever a subscriber selects a displayed advertisement for more information. The information source stores a plurality of advertisements, and includes an advertisement selector which selects advertisements based on the advertising preferences for an identified subscriber such as the calling subscriber. The calling subscriber's switch retrieves the advertising preferences for the calling subscriber from the database and sends the preferences to the information source. The switch then retrieves the selected advertisements from the information source and generates a window on the calling subscriber's display screen which displays the retrieved advertisements. The retrieved advertisements are also sent to the called subscriber's switch for simultaneous display to the called subscriber.

System and method of providing selected advertisements between subscribers utilizing video telephones

A communications system in which information is transmitted in successive time slots grouped into a plurality of superframes which are, in turn, grouped into a plurality of hyperframes. A remote station is assigned to one of the time slots in each of the superframes for paging the remote station, each hyperframe including at least two superframes, and the information sent in the assigned time slot in one superframe in each hyperfame is repeated in the assigned time slot in the other superframe(s) in each hyperframe. Each superframe can include a plurality of time slots used for sending paging messages to remote stations, grouped into a plurality of successive paging frames, and the time slot to which the remote station is assigned is included once in every paging frame. Also, each superframe may include time slots comprising a logical channel for broadcast control information and time slots comprising a logical paging channel. Information sent in the assigned time slot may direct the remote station to read the broadcast control information, and the information may have been encoded according to an error correcting code and include a plurality of bits having polarities that are inverses of cyclic redundancy check bits produced by the encoding. Also, the broadcast control information may comprise special messages that are included in respective time slots comprising a logical special message channel, the time slots of the special message channel may be grouped in successive SMS frames, and the SMS frames may be synchronized to start with a start of a superframe.

Digital control channels having logical channels for multiple access radiocommunication

A method and system for providing support of local control functionality in a mobile telecommunications system independently of mobile station roaming status is provided. In the invention, upon receiving a registration access message a visited system accesses a database and determines whether the registering mobile station supports local control features supported by the system. If the mobile station and system support common local control features the system returns a local control registration confirmation message in place of the normal system registration confirmation message. The local control registration confirmation message confirms registration and also serves as an indication to the mobile station that the mobile station and system support common local control features. The mobile station and system may now function accordingly to allow use of the common local control features.

Local control enhancement in a telecommunications system

A system and method for determining a charge rate for a call from a mobile station in a cellular telecommunications network in which a public system operates a macrocell which overlays a microcell operated by a private system. The private system reports whether it is operating normally to a mobile switching center (MSC) in the public system. The MSC sends a charging record to a billing center and includes a private system status indication (PSSI) which indicates whether the private system is operating normally. The charging record also includes an identity of the mobile station (MSID) and an identity of the cell where the call is placed (CELLID). The billing center determines from the MSID whether the mobile station belongs to the private system, determines from the CELLID which cell the call was placed in, and determines from the PSSI whether the private system is operating normally. The call is charged at the preferential rate upon determining that the mobile station belongs to the private system, the call was placed in the public macrocell, and the private system is not operating normally.

System and method of implementing a private charge rate in a radio

A system in a telecommunications network for providing targeted advertising to subscribers utilizing display screens to conduct a video telephone call. The system comprises a centralized database of subscriber advertising preferences, an information source, a calling subscriber's switch connected to the database and the information source, and a called subscriber's switch connected to the calling subscriber's switch. The database of subscriber advertising preferences stores advertising preferences for subscribers in the network, and is updated whenever a subscriber selects a displayed advertisement for more information. The information source stores a plurality of advertisements, and includes an advertisement selector which selects advertisements based on the advertising preferences for an identified subscriber such as the calling subscriber. The calling subscriber's switch retrieves the advertising preferences for the calling subscriber from the database and sends the preferences to the information source. The switch then retrieves the selected advertisements from the information source and generates a window on the calling subscriber's display screen which displays the retrieved advertisements. The retrieved advertisements are also sent to the called subscriber's switch for simultaneous display to the called subscriber.

System and method of providing targeted advertising during video

A D-AMPS+ cellular communications air interface is presented wherein a packet data control channel and packet data traffic channel is supported in addition to the conventional digital control channel and digital traffic channel. In particular, the packet data control channel, packet data traffic channel and digital traffic channel support multiple modulation level operation (high versus low). Procedures are provided for intracell and intercell modulation transition of mobile station communications carried by a traffic channel. In particular, these procedures facilitate intracell and intercell modulation transition to a traffic channel using the same level of modulation, as well as intracell and intercell (fall-forward and fall-backward) modulation transition to a traffic channel using a different level of modulation.

Support of multiple modulation levels for a cellular traffic channel

Method and apparatus for locating a digital control channel in a

In a mobile radio-telephone system including at least one base station transmitting information to subscriber telephones indicating whether they are being called, a method comprising the steps of dividing a repetitive frame period into a number of sleep-mode slots, determining a sleep-mode slot number to be used for transmitting a call to a particular subscriber telephone using an assigned subscriber telephone number, transmitting a calling message in said determined sleep-mode slot including the assigned subscriber telephone number, repeating transmission of the calling message a number of times as determined by system loading and available capacity to transmit such calls, and transmitting an indication of the number of repeated transmissions capacity and loading currently permits.

Reduced power sleep modes for mobile telephones

Responsive to receipt at an originating switching node of an incoming call, a location request (send routing) message is sent to the home location register for the called mobile station. A routing request (provide roaming) message is then sent from the home location register to the switching node identified by the home location register as currently serving the called mobile station. The serving switching node then sends a routing number request message to the base station controller currently serving the called mobile station. The base station controller then assigns an appropriate one of its routing numbers, and responds back to the originating switching node via the home location register and the visited switching node with the assigned routing number. The assigned routing number is then used to establish a trunk connection between the originating switching node and the base station controller for purposes of effectuating call delivery. Alternatively, the serving switching node makes the selection of the base station controller assigned routing number.

Migration of routing number selection to the base station controller of

A method and apparatus for facilitating inter-network message communications within the framework of a cellular telecommunications network. The message center of the cellular network includes functionality for processing received messages and forwarding the received messages between the cellular network and other connected networks. Each message handled by the message center includes a destination identifier in the text field of the message which identifies not only the delivery destination (addressee) for the message, but also the network over which the message is to be transmitted in order to reach the identified delivery destination. In the preferred embodiment of the invention, the message center functionality facilitates inter-network communications among and between a cellular network (using SMS message format transmissions), a conventional telephone network (using facsimile message format transmissions), and a wide or local area network (using e-mail message format transmissions).

Cellular telephone network having short message service interaction with

In a TDMA or CDMA cellular telephone network including a plurality of registration areas, and in instances of mobile station cell re-selection between a cell located in a first registration area and a cell located in a second registration area, the mobile station processes control or pilot channel signal strength measurements in view of both a conventional reselection hysteresis and an additional registration hysteresis. Reselection is performed by the mobile station when the control or pilot channel signal strength measured with respect to the second registration area cell exceeds the control or pilot channel signal strength measured with respect to the first registration area cell by the sum total of both the reselection hysteresis and the registration hysteresis. This makes it more difficult to obtain an inter-registration area cell reselection to the benefit of minimizing the likelihood of incurring unnecessary consumption of valuable cellular air interface and system resources due to mobile station transit back and forth between the two registration areas.

Control/pilot channel reselection between cells belonging to different

A system and method of managing Temporary Mobile Station Identity (TMSI) parameters in a radio telecommunications network having a first mobile switching center (MSC), a second MSC, and a mobile station operating initially in a service area of the first MSC. A first Validity Area Parameter (VAP) is transmitted from the first MSC and a second VAP is transmitted from the second MSC. The first MSC then assigns a first TMSI to the mobile station, and utilizes the first TMSI to identify the mobile station while the mobile station operates within the service area of the first MSC. The mobile station then determines whether it is receiving the second VAP, and invalidates the first TMSI upon determining that the mobile station is receiving the second VAP. The mobile station then registers in the second MSC utilizing the mobile station's Mobile Identification Number (MIN). The second MSC then assigns a second TMSI to the mobile station which is utilized to identify the mobile station while the mobile station operates within the service area of the second MSC. In an alternative embodiment, TMSIs are allocated by each visitor location register (VLR) in the network, and a single TMSI is utilized to identify the mobile station in all MSCs associated with the allocating VLR.

System and method of managing temporary mobile station identity (TMSI)

A method and system for neighbor cell list creation and verification in a telecommunications system is provided. Over a period of time measurements are performed on signals transmitted and received on measurement channels of cells neighboring the cell for which a neighbor cell list is being created. The results of the signal measurements are used to create an ordered list of the measurement channels on which the measurements were done. A neighbor cell list containing a desired number of cells is then created by placing a certain number of cells having the most interfered measurement channels in the neighbor cell list. The invention also presents a method and system for verifying an existing neighbor cell list. In the method and system measurements are performed on measurement channels of neighbor cells over a period of time. Periodically the measurement results are checked to determine if cells should be added to or deleted from the existing neighbor cell list.

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St-Hubert, Canada

Francois Sawyer