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Mobile relay and system and adjacent region self-optimizing method thereof

A mobile relay and adjacent cell technology, applied in electrical components, wireless communication, etc., can solve the problems of large wear and tear of high-speed rail carriages, low transmission power of mobile relays, and inability to perceive mobile relay cells, so as to reduce operation and maintenance costs , Reduce the effect of user dropped calls

Active Publication Date: 2015-04-29
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. There are many types of adjacent cells: In order to ensure that different types of end users can experience high-speed data and voice services during high-speed rail operation, mobile relays need to support multiple air interface standards such as LTE / 3G / 2G at the same time, so each There is an optimization of the neighbor relationship between the different cells controlled by the macro base station and the mobile relay, and the high-speed rail will pass through many stops during operation, and there will be many high-speed rail stops at the station every day, so if the previous The manual configuration of the neighbor relationship will greatly increase the workload of the operation and maintenance personnel.
[0011] 2. Difficulty in obtaining train stop information: Since the operator and the railway department belong to two independent systems, it is difficult to know the running route and stop station of each train in advance, so it is impossible to pre-configure for each train or the macro base station near the platform Neighbor cell relationship or configure neighbor cell relationship for train or macro base station according to fixed time period
[0012] 3. 2G / 3G macro cells cannot perceive mobile relay cells: In the LTE standard, the discovery of neighboring cells can be carried out in the form of ANR, but the base station functions of Mobile Relay are partially deployed in the train compartment, and not only the transmission power of the mobile relay is small Moreover, the wear and tear of high-speed rail cars is very large, so it is difficult for external users to find out in advance the 2G / 3G cells in the Mobile Relay through ANR measurement to complete the self-optimization of the neighbor cell relationship.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0079] Embodiment 1: This embodiment mainly describes a scene where a high-speed train configured with Mobile Relay enters a station and stops, and then automatically establishes a neighbor relationship. In this embodiment, it is assumed that the Mobile Relay supports three air interface technologies of LTE / EV-DO / 1X at the same time, so for the terminal in the compartment, there is an LTE cell Cell_1, a 1X cell Cell_2 and an EV-DO cell Cell_3; and Assume that the broadcast message SIB8 of the DeNB at the station includes 6 neighbor cells of 1X and EV-DO.

[0080] 1. Mobile Relay estimates that its current speed is lower than 5Km / h by detecting its Doppler frequency shift with DeNB, and the SIB1 message of DeNB carries 1 bit information indicating that the current coverage of DeNB is a station, then the neighbor relationship is activated Add process.

[0081] 2. The Mobile Relay saves the PCI and ECGI of the currently resident DeNB in ​​the same-frequency neighbor relationship...

Embodiment 2

[0092] Embodiment 2: This embodiment mainly describes a scenario where a high-speed rail train equipped with Mobile Relay is not set up for neighbor relationship when it stops halfway. In this embodiment, it is assumed that the Mobile Relay supports three air interface technologies of LTE / EV-DO / 1X at the same time, so for the terminal in the vehicle, there is an LTE cell Cell_1, a 1X cell Cell_2 and an EV-DO cell Cell_3.

[0093] 1. Mobile Relay estimates its current speed to be lower than 5Km / h by detecting its Doppler frequency shift with DeNB, but detects that the 1-bit station indication bit in DeNB’s broadcast message SIB1 is 0, indicating that the area is a non-station area, so the DeNB is not added as its own neighbor cell.

[0094] 2. The DeNB covering the Mobile Relay does not belong to the scope of the station. Although the Mobile Relay indicates itself as an RN through the RRC message after entering its coverage area, the DeNB does not configure the Mobile Relay as ...

Embodiment 3

[0095] Embodiment 3: This embodiment mainly describes a scene where a high-speed rail train configured with Mobile Relay automatically deletes the neighbor relationship after leaving the station. In this embodiment, it is assumed that the Mobile Relay supports three air interface technologies of LTE / EV-DO / 1X at the same time, so for the terminal in the vehicle, there is an LTE cell Cell_1, a 1X cell Cell_2 and an EV-DO cell Cell_3.

[0096] After the train enters the station, Mobile Relay adds the identities of the base station Cell_1X of the macro cell 1X and the base station Cell_DO of the macro cell EV-DO into the corresponding neighbor relationship of the cells Cell_2 and Cell_3. The corresponding Cell_1X and Cell_DO also add the cells Cell_2 and Cell_3 into their corresponding neighbor cell relationships.

[0097]1. When the Mobile Relay finds that its own speed exceeds 10km / h, it deletes all neighbor relationships in the dynamic neighbor list.

[0098] 2. When the DeNB ...

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Abstract

The invention discloses a mobile relay and a system and an adjacent region self-optimizing method thereof and belongs to the field of wireless communication. The method comprises the following steps: when the mobile relay finds that the speed of the train with the mobile relay is lower than a preset first threshold and receives the fact that a donor base station indicates that the coverage area of the donor base station can configure a dynamic adjacent region relationship in a broadcast message, an adjacent region relationship adding process is started; the mobile relay obtains the 2G or 3G adjacent region information of the donor base station through the broadcast message of the donor base station, and effective 2G or 3G adjacent regions are added into a self dynamic adjacent region list; the mobile relay establishes an adjacent region relationship with the 2G or 3G adjacent regions in the dynamic adjacent region list. Through self-sensing, self-measuring and information interaction between nodes, the mobile relay can automatically add the adjacent region relationship of LTE / 3G / 2G regions in a macro base station when the train pulls into a station and pulls out of the station. The whole process does not need artificial participation, and the operation and maintenance cost is reduced.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a mobile relay, its system and a method for self-optimization of adjacent cells. Background technique [0002] The main challenges faced by wireless communication scenarios in high-speed railway scenarios include: [0003] Doppler effect: When there is relative motion between the transmitter and the receiver, the Doppler effect will occur, and there will be a difference between the frequency of the signal received by the receiver and the frequency of the signal sent by the transmitter, and the frequency deviation will be This results in phase rotation of received data symbols, thereby affecting the accuracy of data demodulation. [0004] Mobility management: Compared with ordinary scenarios, high-speed mobile scenarios such as high-speed railways have a very short stay time in the coverage area of ​​each cell along the way due to the very high moving speed. Normal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/02H04W36/08
CPCH04W24/02
Inventor 许森孙震强朱彩勤
Owner CHINA TELECOM CORP LTD
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