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Method for accessing client to service cell in long term evolution advanced system

A technology for accessing services and serving cells, which is applied in access restrictions, electrical components, wireless communications, etc., and can solve problems such as high consumption of transmission power at the user end, bottleneck effect of downlink backhaul links, etc.

Inactive Publication Date: 2012-07-04
POTEVIO INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, under distributed scheduling, there is a bottleneck effect of the downlink backhaul link and the problem that the user end consumes a large amount of transmission power.

Method used

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  • Method for accessing client to service cell in long term evolution advanced system
  • Method for accessing client to service cell in long term evolution advanced system
  • Method for accessing client to service cell in long term evolution advanced system

Examples

Experimental program
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Effect test

Embodiment 1

[0053] See attached figure 2 , is a schematic flowchart of a method for a user to access a serving cell in the first embodiment of the present invention, specifically including the following steps:

[0054] Step 201 , when the UE accesses for the first time, the eNB informs the relay that the downlink is overloaded by exchanging control information.

[0055] Steps 202-203, when RSRP is satisfied eNB -RSRP relay 1 or X 2 >RSRP eNB -RSRP relay ≥X 1 , the UE selects the relay cell as its serving cell, and initiates an access request to the selected relay, and the access request carries the received reference signal strengths of the eNB and the relay.

[0056] Step 204, the relay judges according to the strength of the reference signal received by the UE, when X 2 >RSRP eNB -RSRP relay ≥X 1 When the UE is within the cross coverage of the relay and the eNB, the downlink data transmission of the UE can be transferred to the eNB, so as to avoid the bottleneck effect of the...

Embodiment 2

[0063] attached image 3 It is a schematic flowchart of a method for a user to access a serving cell in the second embodiment of the present invention, specifically including the following steps:

[0064] In steps 301-302, when the UE accesses for the first time, the eNB informs the relay that the downlink is overloaded by exchanging control information. The relay sends load information to the UE.

[0065] There are the following notification methods for relay overload.

[0066] A. Reduce the transmission power of the control signal (such as the synchronization signal SCH) in the relay. The UE selects the sending end (such as eNB) that can bring greater signal strength as the initial access point of the UE;

[0067] B. Reduce the transmission power of the reference signal in the relay. The UE selects the transmitting end (such as eNB) that can bring greater reference signal strength as the initial access point of the UE;

[0068] In the two cases of A and B, because the t...

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Abstract

The invention provides a method for accessing a client to a service cell in an LTE-advanced system. The method comprises the following steps that: eNB informs relay of the downlink load laterality, and accesses UE to the service cell according to a cell selective access condition; service cell access according to the cell selective access condition comprises that: when the signal strength difference of the eNB and the relay is less than X1 which is a fixed value, the uplink and the downlink of the UE are both accessed to the service cell of the relay; when the signal strength difference of the eNB and the relay is more than or equal to X1 and less than X2 which is a fixed value, the uplink of the UE is accessed to the service cell of the eNB; and when the signal strength difference of theeNB and the relay is more than or equal to X2, the uplink and the downlink of the UE are both accessed to the service cell of the eNB. The embodiment of the invention ensures smaller consumption transmission power of the client and no existence of bottleneck effect of a return link in the downlink under distributed scheduling.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, to a method for a user in a Long Term Evolution Advanced (LTE-advanced) system to access a serving cell. Background technique [0002] Existing studies have shown that by introducing a relay node (relay) between the base station node B (eNB) and the terminal (UE) to form a new relay cellular communication system, it can effectively improve network coverage quality, increase system capacity and increase resources. utilization rate. Therefore, the relay is used to realize broadband wireless access during the research and development of the LTE-advanced system. [0003] In the LTE-advanced system, the introduction of relay brings four new types of links: downlink from eNB to relay, uplink from relay to eNB, downlink from relay to UE, and link from UE to relay uplink. In addition, there must be some UEs that are relatively close to the eNB and directly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/02H04W48/08
CPCH04W84/047H04W48/06
Inventor 张莉莉潘瑜高伟东
Owner POTEVIO INFORMATION TECH CO LTD
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