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Method for eliminating interference in special subframes

A special subframe and internal interference technology, applied in the field of 3G long-term evolution, can solve problems such as interference

Active Publication Date: 2016-04-20
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In addition, in Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, there is similar interference in special subframes caused by time delay

Method used

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  • Method for eliminating interference in special subframes
  • Method for eliminating interference in special subframes
  • Method for eliminating interference in special subframes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] From Figure 2(a) to (d) and Figure 3(a) to (c), it can be seen that in the case of using a conventional CP, when interference occurs, the LPN uses the length of the special subframe numbered 4 Configuration, that is, the lengths of DwPTS, GP, and UpPTS are 12, 1, and 1 symbols respectively; in the case of extended CP, when interference occurs, LPN adopts the length configuration of the special subframe numbered 3 , that is, the lengths of DwPTS, GP, and UpPTS are 10, 1, and 1 symbol, respectively. That is, when interference occurs, the lengths of the GP and the UpPTS in the special subframe of the LPN are both 1 symbol. In this way, the method for eliminating interference in the special subframe adopted in this embodiment is to prohibit the LPN from adopting the above two special subframe length configurations, that is, the determined length configuration of the special subframe that the LPN can adopt does not include GP and The length of UpPTS is configured with a len...

Embodiment 2

[0049] Figure 5 The flow of the method for eliminating interference in a special subframe described in this embodiment is shown, and the method mainly includes:

[0050] Step 201: The HPN demodulates the received uplink synchronization code (SYNC_UL). If the demodulation performance is lower than a preset threshold within a preset period of time, it is determined that the uplink reception of the HPN has been affected by the surrounding Interference of DwPTS in LPN special subframes.

[0051] The preset time and the preset threshold described in this step can be calculated and set according to the measured actual wireless communication environment.

[0052] Step 202: The HPN reduces the length of the UpPTS in its own special subframe by one symbol length, for example, reducing the length from 2 symbols to 1 symbol length.

[0053] Specifically, in this step, when the HPN reduces the length of the UpPTS in its own special subframe by one symbol length, the HPN can reconfigure...

Embodiment 3

[0056] Figure 7 The flow of the method for eliminating interference in a special subframe described in this embodiment is shown, and the method mainly includes:

[0057] Step 301: The HPN demodulates the received uplink synchronization code (SYNC_UL). If the demodulation performance is lower than a preset threshold within a preset period of time, it is determined that the uplink reception of the HPN has been affected by the surrounding Interference of DwPTS in LPN special subframes.

[0058] The preset time and the preset threshold described in this step can be calculated and set according to the measured actual wireless communication environment.

[0059] Step 302: The HPN notifies the LPN that its own uplink reception is being interfered by the DwPTS in the LPN special subframe.

[0060] In this step, the HPN may notify the LPN through an interface between the HPN and the LPN, such as the X2 interface, or the HPN may notify the LPN through the core network.

[0061] Step...

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Abstract

The invention discloses a method for eliminating interference in a special subframe, which comprises the steps of confirming the special subframe length configuration can be adopted by an HPN (high-power node) and an LPN ( low-power node) respectively, so as to ensure that the downlink pilot frequency time slot in an LPN special subframe can not interfere with the uplink receiving of the HPN; and selecting special subframe length configuration respectively from the confirmed adoptable special subframe length configuration respectively by the HPN and the LPN. By adopting the method provided by the invention, the interference of the downlink pilot frequency time slot of the LPN special subframe caused by time delay to the uplink receiving of the HPN can be effectively eliminated, so as to improve system performance.

Description

technical field [0001] The invention relates to 3G long-term evolution (LongTermEvolution, LTE) technology, in particular to a method for eliminating interference in a special subframe caused by time delay in an LTE system. Background technique [0002] In order to meet the challenges of broadband access technology and to meet the growing demands of new services, the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) started the standardization of 3GLTE technology at the end of 2004, hoping to further improve spectrum efficiency and improve cell edge Improve user performance, reduce system delay, and provide higher-speed access services for high-speed mobile users. [0003] figure 1 Shows the structure of a special subframe defined by the LTE system. Such as figure 1 As shown, the special subframe includes three parts: downlink pilot time slot (DwPTS), guard interval (GP) and uplink pilot time slot (UpPTS). In the LTE system, a total of 9 speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L1/00
CPCY02D30/70
Inventor 刘雯鑫魏东岩牟勤李勇王文博朱剑驰佘小明陈岚周珏嘉刘柳李明菊
Owner NTT DOCOMO INC