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According to the present application, a mobile terminal utilizes call forwarding techniques to be reliably reachable when operating in either a WLAN or WWAN. The mobile terminal also causes a message for cancelling the forwarding of voice calls to a WLAN identification number of the mobile terminal to be transmitted through the WWAN. The mobile terminal also causes a message for cancelling the forwarding of voice calls to the WWAN telephone number of the mobile terminal to be transmitted through the WLAN. Other additional and alternative techniques are described for reliable reachability.

Although only cell coverage regions are shown. In the top down views for simplicity, each network , , and includes those network components and functionality as described in relation to FIGS. Note that oftentimes, if not always, mobile terminal operates within the coverage region of WWAN although it may not set its transceiver for communications with WWAN In FIG. A close-up top down view is provided in FIG. As described earlier, mobile terminal has two different RF transceiver portions e.

Each RF transceiver portion of mobile terminal is associated with a unique identification number e. Normally, when mobile terminal operates in WLAN and e. On the other hand, when mobile terminal operates in WWAN e. Using techniques of the present application, however, these concerns are alleviated. The steps of the flowchart are taken from the perspective of the mobile terminal having a dual- or multi-mode capability. The steps of the flowchart are performed by one or more controllers or processors of the mobile terminal e.

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When the vertical handoff is identified to be imminent at step e. Preferably, this message includes the call forwarding number, that is, the WWAN identification number where the mobile terminal will be reachable in the WWAN. The WWAN identification number of the call forwarding message is received and stored at a location server e. For example, see the position of mobile terminal in FIG. The WLAN transceiver portion of the mobile terminal is placed into a power down mode of operation, as if is no longer in use.

This message need not include any call forwarding number, but merely a command to cancel the call forwarding. Preferably, this message includes the call forwarding number, that is, the WLAN identification number where the mobile terminal will be reachable in the WLAN.

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The WWAN transceiver portion of the mobile terminal is then placed into a power down mode of operation, as it is no longer in use. Steady-state communication operations then proceed between the mobile terminal and the WLAN in step , and operation repeats as described previously. The flowchart description for FIG.

Referring back to FIG. However, there is still a concern that, during the transition through travel path shown in FIG. Due to this problem, mobile terminal is further configured to operate to send the forwarding message of step of FIG. In this case, mobile terminal utilizes its data communication capability in the WWAN e. This particular technique may be an alternative step to step of FIG. If it is an alternative step to step of FIG.

If it is an additional backup step to step of FIG. As another example, the mobile terminal may have detected a power-down by the end user or reset, followed by a power-on where WWAN coverage is available and WLAN coverage is not. Thus, methods and apparatus for use by a mobile communication device in facilitating voice calls through a wireless local area network WLAN and a wireless wide area network WWAN have been described.

The mobile device subsequently causes a message for cancelling the forwarding of voice calls to a WLAN identification number of the mobile device to be transmitted through the WWAN. The mobile device subsequently causes a message for cancelling the forwarding of voice calls to the WWAN telephone number of the mobile device to be transmitted through the WLAN.

The above-described embodiments of the present application are intended to be examples only. Although the embodiment described related to a WLAN of the Those of skill in the art may effect alterations, modifications and variations to the embodiments without departing from the scope of the application.

All rights reserved. Login Sign up. Search Expert Search Quick Search. Waterloo, CA. Click for automatic bibliography generation. Download PDF What is claimed is: 1. The method of claim 2, wherein the WLAN comprises an The method of claim 1, further comprising: after switching the communication operations to the WWAN coverage region: detecting a predetermined condition; and causing a message for forwarding voice calls to the WWAN identification number of to be transmitted through the WWAN in response to detecting the predetermined condition.

The method of claim 1, further comprising: in lieu of causing the message for forwarding voice calls to the WWAN identification number of the mobile communication device to be transmitted through the WLAN, causing a message for forwarding voice calls to the WWAN identification number of to be transmitted through the WWAN.

The mobile communication device of claim 8, further comprising: the one or more processors being adapted to, when switching communication operations from the WWAN coverage region of the WWAN to the WLAN coverage region of the WLAN: prior to switching the communication operations to the WLAN coverage region, causing a message for forwarding voice calls to the WLAN identification number of the mobile communication device to be transmitted through the WWAN through the first wireless transceiver portion; and after switching the communication operations to the WLAN coverage region, causing a message for cancelling the forwarding of voice calls to the WWAN telephone number of the mobile communication device to be transmitted through the WLAN through the second wireless transceiver portion.

The mobile communication device of claim 9, wherein the WLAN comprises an The mobile communication device of claim 8, wherein a first association is made between the WLAN identification number and a home location register HLR of the WWAN for the forwarding of voice calls, and a second association is made between the WWAN identification number and a location server of the WLAN for the forwarding of voice calls.

The mobile communication device of claim 8, wherein the processor is further configured to, in lieu of causing the message for forwarding voice calls to the WWAN identification number of the mobile communication device to be transmitted through the WLAN, causing a message for forwarding voice calls to the WWAN identification number of to be transmitted through the WWAN.

Product Description

The mobile communication device of claim 9, wherein a first association is made between the WLAN identification number and a home location register HLR of the WWAN for the forwarding of voice calls, and a second association is made between the WWAN identification number and a location server of the WLAN for the forwarding of voice calls. A computer program product, comprising: a computer readable medium; computer instructions stored in the computer readable medium; the computer instructions being executable by one or more processors of a mobile communication device for facilitating voice calls through a wireless local area network WLAN and a wireless wide area network WWAN by: when switching communication operations from a WLAN coverage region of the WLAN to a WWAN coverage region of the WWAN: prior to switching the communication operations to the WWAN coverage region, causing a message for forwarding voice calls to a WWAN identification number of the mobile communication device to be transmitted through the WLAN; after switching the communication operations to the WWAN coverage region, causing a message for cancelling the forwarding of voice calls to a WLAN identification number of the mobile communication device to be transmitted through the WWAN.

The computer program product of claim 15, wherein the computer instructions are further executable for: when switching communication operations from the WWAN coverage region of the WWAN to the WLAN coverage region of the WLAN: prior to switching the communication operations to the WLAN coverage region, causing a message for forwarding voice calls to the WLAN identification number of the mobile communication device to be transmitted through the WWAN; and after switching the communication operations to the WLAN coverage region, causing a message for cancelling the forwarding of voice calls to the WWAN telephone number of the mobile communication device to be transmitted through the WLAN.

The computer program product of claim 16, wherein the WLAN comprises an The computer program product of claim 15, wherein a first association is made between the WLAN identification number and a home location register HLR of the WWAN for the forwarding of voice calls, and a second association is made between the WWAN identification number and a location server of the WLAN for the forwarding of voice calls. Field of the Technology The present application relates generally to mobile communication devices which operate in both wireless wide area networks WWANs such as cellular telecommunication networks and wireless local area networks WLANs such as Description of the Related Art A mobile communication device may be designed to operate on two different types of heterogeneous wireless networks, such as a wireless local area network WLAN e.

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Electrical Engineering (EL ENG)

Einkshop xl remanufactured ink cartridge compatible for hp xl for deskjet printer. Russia printer ink replacement for hp ink cartridge for hp deskjet inkjet printer. Go to store. Link copied to clipboard, share it. Price dropped by 2. More than 6 years of seller experience High general feedback score Not all customers are not satisfied by communication Items match description Seller may delay shipping 7. Find out shipping costs. A repeater system combines co-located antennas, limited and controlled downlink signal amplification, stability management and an amplification indicator to create a user-installed solution to co-channel interference within cellular systems, in strong signal environments such as elevated locations or high-rise building.

The invention may be particularly relevant to cellular systems, such as CDMA, that allow limited imbalance between uplink and downlink path losses, thus enabling the design of an inexpensive downlink repeater which creates moderate signal amplification for selected line-of-sight signals, defeating co-channel interference over a small area. Signal amplification is maintained at a level below the capacity of the system to support imbalance, guaranteeing reliable cellular calls. Provisional Patent Application No. This present invention relates generally to repeater systems for mobile communication systems such as cellular telephone systems, and more particularly to imbalanced downlink repeater systems.

Downlink signals are transmitted to cellular subscriber telephones from directional base station antennas mounted at ft above ground level.

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Uplink signals are received from subscribers by the same directional antennas. In the United States in , there were M subscribers to the cellular service providers available in each urban market. World market size was about M in Power control algorithms in the cellular network establish and vary the uplink power levels to be transmitted from the subscriber unit cell phone in order to maintain good call quality and to minimize interference to other calls. Downlink power levels are either static, or are varied to a lesser degree, relying on information from the subscriber unit in order to determine what downlink power levels will give good audio quality.

Measurements of uplink signal quality are performed by the base stations and then power control commands are issued to the subscriber units to maintain a minimum or ideal signal quality.

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Balanced in this sense may mean less than 1 dB of difference between the two directions. In CDMA systems, subscriber unit transmit power is initially based on the received downlink power, received from a fixed pilot power level that all base stations transmit. The subscriber unit uses its received power, and the knowledge that, on average, the path loss is the same for uplink and downlink balanced , to calculate an appropriate uplink power to transmit with in order to meet the same signal quality requirement as that used on the downlink. Once call setup has begun, the uplink receiver at the base station takes over subscriber power control by transmitting messages to the subscriber, incrementing power up or down times per second to maintain a target signal quality level.

Uplink power control then is substantially independent from the received downlink signal level once call setup begins, and can offset the link balance up to a programmed amount.


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So, the uplink and downlink can be temporarily offset by 20 dB or more at times. Longer-term imbalance can also occur due to system calibration errors, due to noise rise fluctuations at the base station receiver, and due to variations in diversity antenna gain. Typical causes of poor call quality include insufficient capacity, weak coverage, and strong interference. Capacity is the ability to handle many calls e. Capacity can be increased by re-using the frequencies allocated to that service provider many times over in a single city.

CDMA uses a one-cell reuse pattern, meaning every cell uses the same frequency channel all of the time. In this case, talk channels are separated by coding.


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