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Switching method between macro site and femtocell in LTE (Long Term Evolution) system

A macro base station, handover request technology, applied in electrical components, wireless communication, power management and other directions, can solve the problem of single handover technology, and achieve the effect of reducing the number of handovers, reducing the call drop rate, and improving throughput

Inactive Publication Date: 2013-07-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the problems existing in the prior art, the present invention proposes a handover method between a macro base station and a femtocell in an LTE system, considers various types of users (UEs) from the perspective of an actual network, and provides a handover that combines power control and handover The method realizes the handover operation between the macro base station and the femtocell, and overcomes the defect that the existing handover technology is too single

Method used

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  • Switching method between macro site and femtocell in LTE (Long Term Evolution) system
  • Switching method between macro site and femtocell in LTE (Long Term Evolution) system
  • Switching method between macro site and femtocell in LTE (Long Term Evolution) system

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Embodiment 1

[0030] image 3It is a flow chart of power adjustment for Type I UE, which includes the following steps:

[0031] Step 301: Since the signal strength of the Type I UE is weak, the femtocell initiates an unnecessary handover request or the UE has a call drop. Therefore, it is necessary to first determine whether the Type I UE is the initiator of event A, and if so, execute step 302; if not, execute Step 306;

[0032] Step 302: The femtocell cuts out the UE based on the measurement report fed back by the Type I UE, but this switching is unnecessary, and determines that the Type I UE needs to switch because its own signal strength is lower than that of the macro base station signal. In order to improve the I The signal strength of the type UE is increased, and the transmit power of the femtocell is increased;

[0033] Step 303: Determine whether a handover request still needs to be initiated according to the measurement report fed back by the Type I UE, if yes, execute step 304...

Embodiment 2

[0041] Figure 4 A flow chart for type II UE power adjustment, the method includes the following steps:

[0042] Step 401: Due to the weak signal strength of the type II UE, the UE will drop calls or the macro base station will initiate a handover request to the target femtocell, first determine whether the UE is initiating event A, if so, perform step 402; if not, perform step 406;

[0043] Step 402: The Type II UE is a macro user, and the main reason for the weak signal is that the interference signal of the femtocell is relatively strong. The femtocell receives a handover request from the macro base station, considers the balance with its own serving users, and reduces the transmit power;

[0044] Step 403: Femtocll judges whether the type II UE still needs to initiate a handover request according to whether there is a handover request message in the message received from the macro base station, if yes, perform step 404; if not, perform step 405;

[0045] Step 404: judging...

Embodiment 3

[0052] Figure 5 It is a flow chart of UE comprehensive handover, and the method includes the following steps:

[0053] Step 501: Classify UEs according to their locations and handover requests, including Type I UEs, Type II UEs, Type III UEs, and Type IV UEs;

[0054] Step 502: Judging whether the UE is a type I UE, if yes, execute step 503; if not, execute step 504;

[0055] Step 503: execute image 3 Type I UE power adjustment shown;

[0056] Step 504: Determine whether the UE is a type II UE, if yes, execute step 505; if not, execute step 506;

[0057] Step 505: execute Figure 4 Type II UE power adjustment shown;

[0058] Step 506: Determine whether the UE is a type III UE, if yes, execute step 507; if not, execute step 514;

[0059] Step 507: The femtocell receives the handover request from the macro base station, and checks whether the Type III UE is an authorized user, that is, whether the Type III UE is in the CSG list authorized by the femtocell, and if so, ind...

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Abstract

The invention discloses a switching method between a macro site and a femtocell in an LTE (Long Term Evolution) system, belonging to the technical field of mobile communications. The method comprises the following steps of: classifying UE (User Equipment) according to the position and the switching request of the UE, wherein the UE include I type UE, II type UE, III type UE and IV type UE; in combination with the judgment on the four types of UE, realizing automatic control on femtocell transmitting power, and comprehensively calling the switching trigger of the four types of UE. In comparison with the prior art, the method performs adaptive power regulation on the femtocell, and performs adaptive selection on HOM. The method can greatly lower the unnecessary switching times, reduce the UE call drop rate and improve the throughput of the whole network. Meanwhile, the signaling in the switching method provided by the invention can be added to a signaling procedure ruled by a specific standard protocol so as to be realized specifically.

Description

technical field [0001] The present invention relates to the handover technology between a macro base station and a femtocell in a long-term evolution (LTE) system. Background technique [0002] After deploying femtocell in LTE system (femtocell is an ultra-miniature mobile base station launched in recent years according to the development of 3G and the trend of mobile broadband), the seamless handover between macro base station and femtocell is very important. The handover between them mainly includes Three aspects: handover from macro base station to femtocell, handover from femtocell to macro base station and handover between femtocells. The handover between femtocells and the handover process from the femtocell to the macro base station are relatively simple, and only need to set the corresponding femtocell neighbor cell list. However, during the handover process from the macro base station to the femtocell, due to the large number of femtocells, the amount of neighbor c...

Claims

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Application Information

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IPC IPC(8): H04W36/30H04W52/24
Inventor 苏寒松朱世兵孙巍巍
Owner TIANJIN UNIV