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Switching method in radio relay system and radio relay system realizing this switching

A technology of wireless relay and coded modulation, which is applied in the field of wireless relay system for switching, and can solve the problems of invisible relay base stations and inability to perceive RS, etc.

Inactive Publication Date: 2011-02-16
丁益娜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the WiMAX system that introduces the relay station RS, in addition to the handover between different BSs, there are also handover problems between MSs between RSs and BSs, and between RSs and RSs.
In addition, considering backward compatibility, including compatibility with traditional WiMAX terminals, it must be restricted that the introduction of relay base stations is invisible to MS, that is, MS cannot perceive the existence of RS
Therefore, when the MS moves between multiple RSs in the same cell, the change of the downlink signal cannot trigger the handover of the MS between the RS and the RS or the handover of the MS between the RS and the BS; when moving between different cells , although the handover can be triggered by sensing the downlink quality of different cells, the MS cannot perceive the existence of the RS, so the handover between the MS and the RS cannot be triggered by the change of the downlink signal or the MS is between the RS and the RS. switch between BS

Method used

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  • Switching method in radio relay system and radio relay system realizing this switching
  • Switching method in radio relay system and radio relay system realizing this switching
  • Switching method in radio relay system and radio relay system realizing this switching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] See figure 2 , figure 2 It is a flowchart of the first preferred embodiment of the handover method of the present invention. The process includes:

[0166] Step 201: The RS dynamically monitors the uplink signal quality of the MS. This step may also include the BS monitoring the uplink signal quality of the MS.

[0167] Among them, the RS obtains the quality information of the uplink MS→RS link according to its own measurement, that is, the quality information of the received uplink signal.

[0168] Steps 202 to 203, the RS judges whether the received uplink signal quality meets the reporting conditions, and when the reporting conditions are met, the RS reports the uplink signal quality to the BS, and then executes step 204; if the reporting conditions are not met, returns to execute step 201.

[0169] Here, the reported signal quality information includes signal strength, signal to interference and noise ratio, etc.

[0170] Among them, there are many ways for RS to judge wh...

Embodiment 2

[0264] When the MS initially accesses the serving base station BS network, or switches to the serving base station BS during inter-cell handover, or returns from the deep energy-saving state to the normal state, the handover method is executing figure 2 Before step 201 in the first embodiment shown, the method further includes:

[0265] Step 1), the MS searches for the downlink channel sent by the serving base station BS or forwarded by the RS, and establishes synchronization with the downlink channel of the serving base station BS;

[0266] Step 2), the MS obtains the transmission parameters of the uplink channel from the downlink channel, and accordingly sends an uplink signal to the BS, and step 201 monitors the signal.

[0267] Among them, when the MS is in different situations, the specific process of performing step 1) and step 2) is slightly different. The following describes each situation and the entire handover process.

[0268] When initial power-on access:

[0269] See Pi...

Embodiment 3

[0295] The MS has an uplink (UL) signal to be transmitted, and the BS needs to determine the RS active set and anchor RS of the MS. Therefore, the handover method of the present invention further includes a step of requesting bandwidth before performing step 201 in the first embodiment. The requested bandwidth may be in a CDMA competition mode or may be allocated by a BS in a polling mode.

[0296] In the following, two bandwidth request modes will be described in detail for the embodiment of the switching method of the present invention when there is an uplink signal to be transmitted.

[0297] Use CDMA to compete for bandwidth request:

[0298] When using CDMA contention bandwidth request, MS will send CDMA codewords to request access to the channel. Because CDMA codewords are sent on the contention channel, RS and BS don’t know who sent the CDMA code. All received The RS of the CDMA code will report the corresponding information, which includes the CDMA codeword, time-frequency p...

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Abstract

The invention discloses a shifting method in radio relay system. The method includes: the relay station RS dynamically monitoring the quality of uplink signal of terminal MS and send the signal quality information to the service station; the service station identifies the RS with the reported uplink signal that has the best quality as anchor point RS and judges whether the anchor point RS has changed, keeping normal operation and continuing to dynamically monitor uplink signal if no change; otherwise shifting to newly identified anchor point RS to forward service data between the service station and MS. In addition, the invention also discloses a radio relay system for shifting. The method and system provided by the invention enables shifting between RS and between RS and BS in the event that MS is not aware of the existence of RS.

Description

Technical field [0001] The present invention relates to mobile communication technology, in particular to a handover method in a wireless relay system and a wireless relay system for realizing handover. Background technique [0002] In a wireless communication system, due to the path attenuation of electromagnetic waves and the shielding of buildings, some places become areas with low wireless communication signal strength, and the communication quality of mobile terminals located in these areas will become poor. With the increasing demand for broadband wireless communication, the demand for wireless bandwidth has become larger and larger. Therefore, higher and higher carrier frequencies are used in new protocols and systems, but the attenuation of radio waves increases with frequency. Increase with the increase. Therefore, the high carrier frequency is bound to face the problem of high attenuation, which further limits the coverage of the base station. [0003] For example, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/10H04W36/08H04W48/20H04W36/00H04W88/04
CPCH04W88/04H04W84/047H04W36/30H04W36/302
Inventor 尚政张爱民王媛媛李江
Owner 丁益娜