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Method and device for reducing interference

A signal-to-interference ratio and current user technology, applied in the field of wireless communication, can solve the problems of missing the best opportunity, affecting the reduction of co-channel interference, and limited AOA measurement, so as to actively adjust resources, reduce interference accurately, and achieve accurate results Effect

Active Publication Date: 2012-05-23
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the AOA-based DCA scheme, the measurement of AOA is limited by the propagation environment and the accuracy of angle estimation, and areas with severe co-channel interference are often dense urban areas with complex propagation environments, usually without direct line-of-sight, severe multipath, Severely extended angle
Under such conditions, it is difficult to obtain accurate AOA estimation, which will also affect the effect of reducing co-channel interference
The ISCP / TxCP-based DCA scheme passively adjusts resources after interference occurs, and does not consider active resource adjustment through interference assessment, and it is very likely that the best time for adjustment has been missed
Moreover, the interference assessment based on the ISCP and TxCP of the cell cannot consider the difference of the interference source of each user, and it is difficult to reflect the interference situation at the specific location of the user

Method used

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  • Method and device for reducing interference
  • Method and device for reducing interference
  • Method and device for reducing interference

Examples

Experimental program
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Effect test

Embodiment 1

[0023] see figure 1 , this embodiment provides a method for reducing interference, including:

[0024] 101: According to the signal-to-interference ratio of the current user and the signal-to-interference ratio of the user on the available time slot and available frequency point, calculate the isolation between the current user and the user on the available time slot and available frequency point, and the isolation degree is the same as Interference is inversely proportional to;

[0025] 102: According to all the calculated isolation degrees, determine the time slots and frequency points corresponding to the isolation degrees greater than the preset threshold, and use the time slots and frequency points as resources to be allocated;

[0026] 103: Send information about the resources to be allocated to an RNC (Radio Network Controller, radio network controller), so that the RNC allocates the resources to be allocated to the current user.

[0027] Wherein, step 101 may specifi...

Embodiment 2

[0035] see figure 2 , this embodiment provides a method for reducing interference, including:

[0036] 201: When the current user is handed over from the serving cell to the target cell, the RNC sends a message to the base station to notify the base station of the current user handover.

[0037] Specifically, the RNC may notify the base station of the user handover through an Iub port-specific measurement control message.

[0038] 202: After receiving the above message, the base station calculates a first SIR of the current user, and calculates a second SIR of users on available time slots and available frequency points.

[0039] This embodiment does not specifically limit the number of available time slots and available frequency points, which may be one or multiple. Usually, there are multiple available frequency points, and each frequency point corresponds to a fixed frequency, and different frequency points correspond to different frequencies. On each available frequency ...

Embodiment 3

[0083] see Figure 4 , this embodiment provides a device for reducing interference, including:

[0084] The calculation module 401 is configured to calculate the isolation between the current user and the users on the available time slots and available frequency points according to the signal-to-interference ratio of the current user and the signal-to-interference ratio of the users on the available time slots and available frequency points, This isolation is inversely proportional to interference;

[0085] The determination module 402 is configured to determine the time slot and frequency point corresponding to the isolation degree greater than the preset threshold according to all the isolation degrees calculated by the calculation module 401, and use the time slot and frequency point as resources to be allocated;

[0086] The sending module 403 is configured to send the information of the resource to be allocated obtained by the determining module 402 to the radio network ...

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Abstract

The invention discloses a method and a device for reducing interference, which belong to the technical field of radio communication. The method comprises the following steps of: calculating isolation between the current user and users on a usable time slot and a usable frequency point according to the signal-to-interference ratio of the current user and the signal-to-interference ratios of the users on the usable time slot and the usable frequency point, wherein the isolation is inversely proportional to the interference; according to all the calculated isolation, determining a time slot and a frequency point corresponding to the isolation which is higher than a preset threshold value, and taking the time slot and the frequency point as resources to be allocated; and transmitting information of the resources to be allocated to a radio network controller to ensure that the radio network controller allocates the resources to be allocated to the current user. The device comprises a calculation module, a determination module and a transmitting module. By the method and the device, the interference between the current user and other users is reduced, and the phenomena of call dropping caused by the interference in the process of user access or switching can be reduced.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and device for reducing interference. Background technique [0002] Short scrambling codes and short spreading codes of TD-SCDMA (Time Division Synchronous CDMA, Time Division Synchronous Code Division Multiple Access) make the orthogonality between users poor, and mutual interference between users is likely to occur. In addition, the limited spectrum resources make the same-frequency cells closer to each other during networking, and the same-frequency interference is further aggravated. In this way, when the user moves to the edge of the cell and a co-frequency handover occurs, the user in the original cell in the time slot where the user is located may suffer strong co-frequency interference. . In this case, the handover user and the user with a poor channel environment in the original cell may experience a call drop, which not only affects user experi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/10
Inventor 杨武涛贺萃李小捷
Owner HUAWEI TECH CO LTD
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