The method to avoid the handover request being rejected after joining the relay in LTE-A

An LTE-A, handover request technology, applied in access restriction, electrical components, wireless communication, etc., can solve problems such as large handover delay, call drop, handover request rejection, etc., to achieve the effect of reducing handover delay

Inactive Publication Date: 2011-12-14
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] It can be seen from the above examples that if the original handover scheme is adopted after adding a relay node, the handover request will easily be rejected, which will bring a large handover delay and even cause call drop.
To sum up, the addition of relay nodes will greatly increase the probability that the handover request will be rejected, and the handover delay will increase.

Method used

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  • The method to avoid the handover request being rejected after joining the relay in LTE-A

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Embodiment 1

[0037] This embodiment provides a method for avoiding the rejection of the handover request after adding a relay in LTE-A. The method describes the handover process for the user to handover from the source RN to the target RN under the same DeNB, as shown in Figure 4 shown. Figure 4 The steps marked by the dotted box in the middle are the places that are different from the original switching process. The method of this embodiment is the same for the above six different handover types.

[0038] The RN node of each cell uses the broadcast channel to broadcast information such as the load of the cell and the status of the backhaul link. Due to the shortage of broadcast channel resources, the information it carries needs to be simplified. The information expression method is as follows: the load and the backhaul link information are considered to be the same concept , any bad condition can be used as a judgment to reject the handover request. The heavy load also means that the ...

Embodiment 2

[0045] This embodiment provides a method for avoiding the rejection of the handover request after adding a relay in LTE-A. This method describes the process of handing over the user from the source RN under the cell DeNB1 to the target RN under the cell DeNB2, as shown in Figure 5 shown. Figure 5 The arrow in the middle dashed line indicates the moving direction of the user. During the moving process, the user measures the strong signal strength of the RN subordinate to DeNB2, and reports the measured signal strength information to the source RN.

[0046] In the traditional handover procedure, the user selects the RN with the strongest signal to initiate a handover request, but the method described in this embodiment adds 4 steps before initiating the handover request, corresponding to the 4 arrows marked by numbers in the figure one by one:

[0047]Step 1. The measurement report received by the source RN includes the cell ID and signal strength of each destination RN. The s...

Embodiment 3

[0062] The difference between this embodiment and Embodiment 2 is: if the candidate cell measured by the user has a stronger signal than the RN under the same DeNB, the user only needs to ask the DeNB of this cell about the situation of the RN node, that is, only execute the embodiment Steps 1 and 4 as described in one. This is the above-mentioned second handover type—a handover method in which a user is handed over from an RN to another RN in the same cell.

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Abstract

The invention discloses a method for avoiding a handover request from being rejected after adding a relay in LTE-A. The method is as follows: before sending a handover request, a source RN node obtains the load conditions of the cells where each candidate destination RN node is located by adding signaling and backhaul link conditions, and then comprehensively consider the load conditions, backhaul link conditions, or/and the signal strength of the cell where each candidate target RN node is measured by the user to select an appropriate target RN node to initiate a handover request. The invention avoids the rejection of the switching request or the switching failure by using the information such as the AC load and the channel condition before the switching, and reduces the switching delay.

Description

technical field [0001] The invention belongs to the field of mobile communication, and relates to a method for avoiding a handover request from being rejected after adding a relay in LTE-A. Background technique [0002] In order to solve challenges such as the shortage of spectrum resources, limited coverage and system capacity, and increasing user demand, in March 2008, the International Telecommunication Union (ITU) launched the technical solicitation work for the fourth-generation mobile communication system IMT-Advanced, officially launched 4G standardization work. The 3rd Generation Partnership Project (3rdGeneration Partnership Project, 3GPP) submitted the 4G-oriented LTE-A technology to the ITU, and carried out research work on the LTE-A. [0003] Research on relay technology is introduced in LTE-A (Long Term Evolution-Advanced). The introduction of the relay station improves the coverage quality and coverage of the signal to a certain extent, and improves the syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/08H04W48/10H04W48/20
Inventor 曾媛杨旸朱元萍杜婷徐景
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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