Automatic test system and method
An underlying area, overlapping area technology, applied in communication between multiple stations, code division multiplexing systems, cables, etc., can solve the lack of MAHHO type reporting support, interference, waste of 1xEV base station capacity and coverage, etc. question
Inactive Publication Date: 2009-03-04
LUCENT TECH INC
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Problems solved by technology
This creates a transition zone between the overlay 1xEV system and the underlying 3G-1X system, thereby wasting the capacity and coverage of 1xEV base stations on the border between the overlay and underlay systems
The 1xEV standard also supports an option to redirect individual mobile terminals to the underlying system, but lacks support for any MAHHO type reporting of the signal quality of the target 3G-1X carrier
On the other hand, there is currently no method for determining whether a hybrid mobile terminal operating on a border and communicating with an overlapping 1xEV system is likely to cause interference to a 3G-1X base station in the underlay area
Therefore, there is currently no timely, reliable and waste-free method for switching from an overlay 1xEV system to an underlay 3G-1X system before possible interference to border base stations in the underlay system
Therefore, the possibility of adversely affecting the underlying 3G-1X system will seriously affect the deployment of 1xEV system
Method used
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[0012] refer to figure 1 , wherein a plurality of base stations are located within an overlapping area 101 of a mobile service provider area 100 including an overlapping area 101 and an underlying area 106 . For illustration purposes, only three base stations 102, 103 and 104 are shown within the overlapping area 101, but it should be understood that many more base stations may be used to provide coverage for mobile users in this area. In the described embodiment, the overlapping area provides 1xEV high-speed data service to the user of the hybrid mobile terminal 105, wherein the terminal also acts as a 3G-1X mobile terminal. When operating in the latter mode, the mobile terminal 105 will provide voice and low speed data services. However, when the mobile terminal is inside the overlapping area 101, the hybrid 1xEV / 3G-1X terminal 105 can initiate and receive high-speed data calls through the base stations 102-104. In addition, when the mobile terminal is within the overlappi...
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In order to avoid interfering with the reverse link of base stations inside the underlay region, the method described in the present invention determines when to communicate with a border base station in the overlapping region on an adjacent carrier while also being within the coverage area of the base station of the underlay region The mobile terminal performs redirection and handover. The method determines that redirection and handover for the base station should be performed when both the following conditions are met: (1) the power received on the downlink from the base station in the underlay area is greater than the power received on the downlink from inside the overlapping area The power received by the border base station is higher than a first predetermined threshold, which indicates that the mobile terminal is at the border of the overlapping area; The sum of the powers is greater than a second predetermined threshold, which indicates that the power received by the base station in the underlay area from the transmitting mobile terminal may interfere with the operation of said base station.
Description
technical field [0001] The present invention relates to mobile communications. Background technique [0002] Adjacent channel interference is always a problem in multi-carrier deployment scenarios for CDMA mobile systems due to the so-called "near-far" effect. This near-far problem will be exposed at the boundaries of overlay areas where additional CDMA carriers are deployed for capacity or other reasons. When a mobile terminal communicating with a border base station in an overlapping area and operating on a carrier frequency deployed in the area crosses the border of the overlapping area and enters an underlay area covered by base stations operating on other carrier frequencies, the Should the mobile terminal switch frequency and handover to a second base station in the underlay area to continue communicating on one of these other carrier frequencies, this process is commonly referred to as a "hard" handover. However, if the mobile terminal does not switch in time, it is...
Claims
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IPC IPC(8): H04Q7/38H04J13/02H04W24/08H04B7/26H04M3/22H04W24/04H04W36/04H04W36/20
CPCH04W36/04H04W36/20H01B7/0216H01B7/1825H05B3/56H05K9/0098
Inventor 弗拉丹·乔万诺维克
Owner LUCENT TECH INC