CN102333378B - Interference coordination method in LTE (long term evolution) system - Google Patents

Abstract

The invention discloses an interference coordination method in an LTE (long term evolution) system. The method comprises the following steps: when UE (user equipment) in an idle mode need to apply measurement resource restriction, the UE transfers to a connecting mode from an idle mode, and a measurement report is transmitted to an evolved node B (eNB); the eNB determines that the UE is about to use ABS (almost blank sub frames) according to the measurement report, and configures the UE in a connecting mode to apply the ABS, and simultaneously the eNB carries out scheduling correspondingly according to the ABS; finally the UE in a connecting mode enters an idle mode again; or the eNB always reserves a part of sub frames as ABS, the information of the preserved ABS is notified to the UE in an idle mode, and when the UE in an idle mode needs to apply the ABS, the ABS notified by the eNB are applied. The invention provides a specific scheme for making corresponding adjustment in the aspect of signal transmission when the UE in an idle mode applies the measurement resource restriction.

Description

Disturbance coordination method in a kind of Long Term Evolution LTE system

Technical field

The present invention relates to moving communicating field, particularly relate to the disturbance coordination method in a kind of Long Term Evolution LTE system.

Background technology

Heterogeneous network is the technology of a kind of remarkable elevator system throughput and overall network efficiency, refers to that low power nodes is placed in macro base station coverage area by cloth, forms the heterogeneous system with the different node types covered.Low power nodes (Low Power Node, LPN) comprises micro-base station, millimicro cellular basestation (being often referred to Home eNodeB) etc.That is, the wireless coverage of the different sizes such as grand (macro) community, micro-(pico) community, Home eNodeB (femto) community, different capacity may be had in a region simultaneously.These communities separately power are different, and the interference produced UE in different positions is also different.In heterogeneous network, very part and parcel is exactly each internodal interference problem with covering, especially because macro base station transmitting power is much larger compared with LPN, cause macro base station to the interference of boundary user downlink reception in LPN, and the high-power terminal in macro base station edge is to the interference of neighbouring LPN.In addition, under the closed user group such as Home eNodeB (Closed Subscriber Group, C SG) scene, the transmitting of Home eNodeB also can impact neighbouring macro base station user, and the interference thus between control channel is more crucial problem.

The task of Inter-Cell Interference Coordination (ICIC) is exactly managing radio resources, to control the interference of community.

Inter-Cell Interference Coordination (eICIC) method of enhancing is introduced in LTE Release 10.It is a kind of time domain approach, uses almost blank subframe (Almost Blank Subframes, ABS) to protect the resource being subject to strong presence of intercell interference.Wherein, ABS subframe refers to the subframe reducing transmitted power (comprise and not sending) and taking in sail property on some physical channels.Its idle mode UE is when applying measurement resource restriction (subset of Macro community ABS and/or the subset of Femto community ABS), network needs to coordinate in transmission signal simultaneously, and interference base station must not sent out or reduce power and send some signal in measurement restriction resource

But UE mobility is at the idling mode controlled by UE.Can be different to base station reporting measurement reports from the UE of connection mode, idle pulley UE can only carry out the reception of downlink system information/paging, do not report any uplink information, therefore in the process of idle pulley UE movement, wireless base station (the Evolved Node B of evolution, eNB) do not know the accurate location of idle pulley UE, when idle pulley UE applies the restriction of measurement resource, corresponding adjustment cannot be done in transmission signal.

Summary of the invention

The invention provides the disturbance coordination method in a kind of Long Term Evolution LTE system, the method makes eNB when idle pulley UE applies the restriction of measurement resource, does to make corresponding adjustment in transmission signal.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention discloses the disturbance coordination method in a kind of Long Term Evolution LTE system, the method comprises:

Idle pulley UE detect needs apply almost blank subframe ABS time, shifted to connection mode by idle pulley;

Transfer is for the UE reporting measurement reports of connection mode is to the wireless base station eNB of evolution;

According to described measurement report, eNB judges that described UE will use ABS;

ENB configures connection mode UE application ABS, dispatches accordingly.

In the above-mentioned methods, described eNB configuration connection mode UE application ABS method specifically comprises:

ENB is by radio resource control RRC specific messages configuration connection mode UE application ABS.

In the above-mentioned methods, the method comprises further: after eNB configures connection mode UE application ABS, eNB allows connection mode UE reenter idle mode state.

In the above-mentioned methods, described eNB allows connection mode UE reenter idle mode state to comprise:

The RRC of eNB release connection pattern UE connects, and allows connection mode UE reenter idle condition.

A disturbance coordination method in Long Term Evolution LTE system, the method comprises:

ENB by ABS message notice to idle pulley UE; Described ABS information is a part of subframe that eNB reserves, and eNB does not carry out dispatching or dispatching with pole low-power in these reserved subframes;

Idle pulley UE think need application ABS time, application eNB notice ABS.

In the above-mentioned methods, ABS message notice comprises to idle pulley UE by described eNB:

ENB by system message by ABS message notice to idle pulley UE.

From above-mentioned, this idle pulley UE of the present invention detect needs apply almost blank subframe ABS time, shifted to connection mode by idle pulley; Transfer is for the UE reporting measurement reports of connection mode is to the wireless base station eNB of evolution; According to described measurement report, eNB judges that described UE will use ABS; ENB configures connection mode UE application ABS, carries out the technical scheme of corresponding scheduling, makes eNB when idle pulley UE applies the restriction of measurement resource, does to make corresponding adjustment in transmission signal.

Accompanying drawing explanation

Fig. 1 is the detailed process figure of disturbance coordination method 1 in example of the present invention.

Embodiment

The present invention adopt idle pulley UE detect needs apply almost blank subframe ABS time, after being shifted to connection mode by idle pulley, transfer is for the UE reporting measurement reports of connection mode is to the wireless base station eNB of evolution, according to described measurement report, eNB judges that described UE will use ABS, eNB configures connection mode UE application ABS and measures accordingly, simultaneously eNB also dispatches accordingly according to ABS, and most relief connection mode UE reenters idle mode state; Or idle pulley UE can't help the state transitions of idle pulley to connection mode, but eNB reserves a part of subframe all the time as ABS subframe, by the message notice of these reserved ABS to idle pulley UE, namely described ABS information is a part of subframe that eNB reserves, eNB does not carry out dispatching or dispatching with pole low-power in these reserved subframes, idle pulley UE is thinking that to need the application ABS moment automatic, the technical scheme of application ABS.

In order to make the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the drawings and specific embodiments.

Specific embodiments is as follows:

Method one:

Idle pulley UE detect need application ABS time, initiatively initiate by idle pulley to the state transitions to connection mode, enter connection mode, shift as the UE reporting measurement reports of connection mode is to eNB, wherein in measurement report, contain the information that described UE needs to apply ABS.ENB judges describedly will use ABS to connection mode UE according to described measurement report, and eNB configures connection mode UE application ABS, dispatches accordingly.Wherein, eNB by wireless heterogeneous networks (Radio Resource Control, RRC) specific messages configuration connection mode UE application ABS, while eNB start to apply ABS and dispatch accordingly, to avoid interference.After eNB configures connection mode UE application ABS, eNB allows connection mode UE reenter idle mode state, and namely the RRC of eNB release connection pattern UE connects, and allows connection mode UE reenter idle condition.

Fig. 1 is the detailed process figure (in figure, UE acute pyogenic infection of finger tip initial condition is the UE of idle pulley, and because this method idle mode UE will switch between connection mode and idle pulley, therefore direct UE represents) of disturbance coordination method 1.As shown in Figure 1, concrete steps are as follows:

101, idle pulley UE judge to need to apply ABS;

102, when above-mentioned situation, idle pulley UE is initiatively shifted to connection mode by idle pulley, enters connection mode, and sends RRC connection request message to eNB;

103, eNB sets up and is connected with the RRC of this UE;

104, this UE is to eNB reporting measurement reports;

According to measurement report, 105, eNB judges that this UE needs to apply ABS;

106, eNB is connected this UE reconfiguration message by RRC, configuration abs mode, and namely eNB is by RRC specific messages configuration connection mode UE application ABS.

106, this UE have reshuffled message by RRC connection to eNB transmission;

107, eNB discharges RRC and connects, and allows this UE reenter idle pulley.

In like manner, when idle pulley UE no longer needs ABS, can again by the process notifications eNB in Fig. 1, such eNB can stop the application to ABS.

The advantage of the method is that idle pulley UE can notify eNB in time when needs application ABS, and idle pulley UE is consistent with the application of eNB both sides to ABS.

Method two

ENB by ABS message notice to idle pulley UE, wherein, described ABS information is a part of subframe that eNB reserves, and eNB does not carry out dispatching or dispatching with pole low-power in these reserved subframes, idle pulley UE, when needs application ABS, applies the ABS of eNB notice.

That is, eNB by system message by ABS message notice to idle pulley UE, this UE does not need the method shifted to connection mode through idle pulley to need to apply ABS to eNB notice, just needs the moment applying ABS automatically to apply ABS thinking.Because ABS information is a part of subframe that eNB always reserves, do not carry out dispatching or dispatching with pole low-power in these subframes.Application ABS, eNB also reserved ABS subframe is needed even without idle pulley UE.

The advantage of the method is minimum for the interference of adjacent area.

In sum, after this employing idle pulley of the present invention UE is shifted to connection mode by idle pulley, be the wireless base station eNB of UE reporting measurement reports to evolution of connection mode after transfering state, according to described measurement report, eNB judges that described UE will use ABS, and eNB configures connection mode UE application ABS, dispatch accordingly, most relief connection mode UE reenters idle mode state; Or idle pulley UE can't help the state transitions of idle pulley to connection mode, but eNB by ABS message notice to idle pulley UE, described ABS information is a part of subframe that eNB reserves, eNB does not carry out dispatching or dispatching with pole low-power in these reserved subframes, idle pulley UE, thinking the technical scheme needing the application ABS moment automatically to apply ABS, gives about eNB the concrete scheme applying eICIC in the cell reselection process of idle pulley UE.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (1)

1. the disturbance coordination method in Long Term Evolution LTE system, it is characterized in that, the method comprises:

Idle pulley UE detect needs apply almost blank subframe ABS time, initiatively initiate to be shifted to connection mode by idle pulley;

Transfer is for the UE reporting measurement reports of connection mode is to the wireless base station eNB of evolution;

According to described measurement report, eNB judges that described UE will use ABS;

ENB configures connection mode UE will the ABS of application when entering idle pulley afterwards, dispatches accordingly;

Wherein, described eNB configuration connection mode UE application ABS method specifically comprises:

ENB is by radio resource control RRC specific messages configuration connection mode UE application ABS;

Wherein, the method comprises further: after eNB configures connection mode UE application ABS, eNB allows connection mode UE reenter idle mode state;

Wherein, described eNB allows connection mode UE reenter idle mode state to comprise:

The RRC of eNB release connection pattern UE connects, and allows connection mode UE reenter idle condition.