KR20130007989A - Method for communication of terminal - Google Patents

Method for communication of terminal Download PDF

Info

Publication number
KR20130007989A
KR20130007989A KR1020120075359A KR20120075359A KR20130007989A KR 20130007989 A KR20130007989 A KR 20130007989A KR 1020120075359 A KR1020120075359 A KR 1020120075359A KR 20120075359 A KR20120075359 A KR 20120075359A KR 20130007989 A KR20130007989 A KR 20130007989A
Authority
KR
South Korea
Prior art keywords
terminal
base station
mode
value
timer
Prior art date
Application number
KR1020120075359A
Other languages
Korean (ko)
Inventor
김원익
김은경
김성경
장성철
이현
윤미영
윤철식
임광재
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to US13/546,543 priority Critical patent/US20130017817A1/en
Publication of KR20130007989A publication Critical patent/KR20130007989A/en
Priority to US14/050,989 priority patent/US20140038580A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Master-slave selection or change arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices

Abstract

PURPOSE: A communication method of a terminal is provided to execute an optimal base station role by avoiding mutual interference on a radio wave. CONSTITUTION: When a base station(100) is collapsed(S510) and a random back-off timer is terminated, a terminal(310) converts a mode(S540). After the mode is converted, the terminal is operated as a base station. A random back-off delay time calculated by the random back-off timer is determined according to the state information of the terminal. The state information includes the battery residual information of the terminal. The random back-off delay time is related to the mode conversion attempt. [Reference numerals] (100) Base station; (310,320) Multimode terminal; (330) Normal terminal; (BB) Preset time; (CC) Random back-off delay time; (S520,S530) Calculating random back-off time; (SS10) Base station function loss; (SS540) Base station mode conversion

Description

Terminal communication method {METHOD FOR COMMUNICATION OF TERMINAL}

The present invention relates to a communication method of a terminal.

In the event of a disaster or disaster, important infrastructure can be destroyed or damaged. Many infrastructures, such as wireless telephones, landline telephones, and Internet networks, are considered important infrastructure infrastructures. If these communication facilities are destroyed or damaged, social congestion and disaster recovery can be difficult to secure. have. It is therefore important to have a means of quickly restoring or replacing telecommunications facilities.

When the base station is disrupted among such communication facilities, discussions on how to perform the role of the base station by the multi-mode terminal as well as the direct communication as an alternative communication method is actively in progress. Here, it is necessary to define a method for a start condition in which a multi-mode terminal performs a role of a base station. That is, when a base station is disintegrated without notice in a disaster disaster environment, radio interference may occur when a plurality of adjacent multi-mode terminals simultaneously serve as a base station. In particular, the closer the distance between the multi-mode terminal, the more severe the interference may be.

In addition, even if the multi-mode terminal starts the base station function without interference, if the state of the terminal, such as the battery remaining is not good, the base station function must be transferred to another multi-mode terminal may cause network load.

SUMMARY OF THE INVENTION An object of the present invention is to propose a method for selecting a multi-mode terminal capable of performing an optimal base station role while avoiding cross propagation interference when the multi-mode terminals serve as a base station.

The communication method according to the present invention is a communication method of a terminal, when the base station is disrupted, the terminal starts a mode change when a random backoff timer expires, and the terminal after the mode change is completed Acting as this base station.

The random backoff delay time calculated by the random backoff timer may be determined according to state information of the terminal.

The state information may include battery remaining information of the terminal.

The random backoff delay time may be a time until the UE determines the mode change attempt.

The terminal may be a multi-mode terminal capable of operating as a base station or a relay station.

A communication method according to another embodiment of the present invention is a communication method of a terminal, wherein the terminal calculates a value of a backoff timer, and when the terminal receives a radio signal before the backoff timer expires, the terminal Aborting this mode change.

The terminal may be a multi-mode terminal capable of operating as a base station or a relay station.

The calculating may include calculating a value of the backoff timer based on state information of the terminal.

The state information may include battery remaining information of the terminal.

As the battery level of the terminal increases, the value of the backoff timer decreases. As the battery level of the terminal decreases, the value of the backoff timer increases.

The radio signal may include a preamble.

The value of the back off timer may have a random value within a certain range.

A communication method according to another embodiment of the present invention is a communication method of a terminal, the terminal calculating a value of a backoff timer, and when the terminal does not receive a preamble before the backoff timer expires, the terminal Performing this mode change.

The mode change may be performed after the backoff timer expires.

The terminal may be a multi-mode terminal capable of operating as a base station or a relay station.

The calculating may include calculating a value of the backoff timer based on state information of the terminal.

The state information may include battery remaining information of the terminal.

If the battery level of the terminal is large, the value of the backoff timer is small, and if the battery level of the terminal is small, the value of the backoff timer may be large.

The value of the back off timer may have a random value within a certain range.

According to the present invention, when the multi-mode terminal serves as a base station, it is possible to secure the reliability of the communication network by proposing a method for selecting a multi-mode terminal capable of avoiding mutual interference and performing an optimal base station role. .

1 is a flowchart illustrating an example of radio wave interference that may occur in a communication system according to an embodiment of the present invention.
2 is a flowchart illustrating a communication method according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, a mobile station (MS) is referred to as a terminal, a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) may refer to an access terminal (AT), a user equipment (UE), an advanced mobile station (AMS), a high reliability mobile station (HR-MS) , SS, PSS, AT, UE, AMS, HR-MS, and the like.

In addition, the base station (base station 100) is a node B (evolved node B, eNodeB), access point (access point, AP), radio access station (radio access station, RAS) , Base transceiver station (BTS), mobile multihop relay (MMR) base station, advanced base station (base station A), high reliability base station (HR-base station), base station It may also refer to a relay station (RS), an advanced relay station (ARS), a high reliability relay station (HR-RS) serving as a base station, etc. Node B, eNodeB, It may include all or part of the functions of AP, RAS, BTS, MMR-base station, A-base station, HR-base station, RS, ARS, HR-RS, and the like.

A communication method of a terminal will now be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an example of radio wave interference that may occur in a communication system according to an embodiment of the present invention.

The communication system includes a base station 100, multi-mode terminals 310 and 320, and general terminals 330, 340, 350 and 360. Here, the multi-mode terminals 310 and 320 are terminals capable of operating as a base station or a relay station, and the general terminals 330, 340, 350 and 360 are terminals that operate only as terminals without operating in a multi-mode.

The multi-mode terminals 310 and 320 and the general terminals 330, 340, 350 and 360 are present in the service area 10 of the base station 100. Meanwhile, the multi-mode terminal 310 has a service area 11, the multi-mode terminal 320 has a service area 21, and the service area 11 and the service area 21 overlap each other.

When the base station 100 is disintegrated without notice, the multi-mode terminals 310 and 320 in communication with the base station 100 may not receive a radio signal, for example, a preamble, from the base station 100, and other than the base station 100. Signals may also not be received from other base stations or relay stations in. In such an environment, the multi-mode terminals 310 and 320 may function as terminals and simultaneously serve as a base station. As a result, the multi-mode terminals 310 and 320 are adjacent to each other, so that radio wave interference occurs, and thus the general terminals 330, 340, 350, and 360 may not be able to communicate with each other. In addition, when the multi-mode terminal 310 performs the role of a base station, if the performance state of the multi-mode terminal 320 is better than the performance state of the multi-mode terminal 310, for example, the remaining battery capacity of the multi-mode terminal 310 If less than the remaining battery capacity of the multi-mode terminal 320, the role of the base station should be transferred to the multi-mode terminal (310). However, when such a transfer operation occurs, this may cause a temporary disconnection of the network, which may result in communication failure of the general terminals 330, 340, 350, and 360.

To this end, an embodiment of the present invention proposes a method for preventing a plurality of multi-mode terminals from simultaneously serving as a base station and selecting an optimal multi-mode terminal to operate as a base station. This will now be described in detail with reference to FIG. 2.

2 is a flowchart illustrating a communication method according to an embodiment of the present invention.

Referring to FIG. 2, the multi-mode terminals 310 and 320 and the general terminal 330 existing in the service area 10 of the base station 100 normally communicate with the base station 100 during a normal communication interval. Then, the base station 100 may be broken and an event of losing the function of the base station may occur (S510).

At this time, if the multi-mode terminal (310, 320) does not receive a radio signal from the base station 100, that is, a preamble for a predetermined time, the multi-mode terminal (310, 320) prepares to perform the role of the base station. In this case, the preset time refers to the time until the multi-mode terminal 310 or 320 determines the base station role switching attempt when the base station 100 breaks down its function without notice.

Subsequently, the multi-mode terminals 310 and 320 calculate a random backoff delay time using their state information (S520 and S530). At this time, the state information of the multi-mode terminal includes the remaining battery information, the signal strength of the base station 100 and the state information of the multi-mode terminal, such as the multi-mode capability of the multi-mode terminal (310, 320) and the like can be derived.

If the preamble is received from the base station 100 while waiting for the random back-off delay time, the multi-mode terminals 310 and 320 determine that the base station 100 has been restored, perform a function as a normal terminal, and finish preparing to change the base station mode. do.

If the multi-mode terminal 310 does not receive the preamble from the base station 100 while waiting for a random back-off delay time (S540).

A random back-off delay time will now be described by taking a case where the state information of the multi-mode terminals 310 and 320 is the remaining battery power.

The random back-off delay time can be counted using a random backoff timer, which consists of a window such as [0 ~ Wdelay]. The back-off delay time that the multi-mode terminals 310 and 320 have to wait has a random value between 0 and Wdelay. At this time, the Wdelay value may be determined in consideration of the battery level. That is, when the battery level is large, the Wdelay value becomes small, and when the battery level is low, the Wdelay value becomes large.

As such, the multi-mode terminals 310 and 320 determine whether to change the base station mode after the random back-off timer ends, thereby preventing the plurality of multi-mode terminals 310 and 320 from serving as the base station at the same time. In addition, the optimal multi-mode terminal can perform the role of a base station by determining the random back-off delay time in consideration of the state information of the multi-mode terminal (310, 320).

According to the related art, when the base station 100 loses its function without notice, a plurality of multi-mode terminals 310 and 320 may simultaneously start the role of the base station and severely cause radio wave interference. According to the multi-mode terminal (310, 320) can receive the preamble from the base station 100 during the random back-off delay time to start the role of the base station, it is possible to prevent radio interference.

In addition, according to an embodiment of the present invention by determining the state information such as the remaining battery power of the multi-mode terminal (310, 320) when calculating the random back-off delay time, the optimal multi-mode terminal (310, 320) is the base station Play a role. As a result, temporary network disconnection and load due to the transfer of the role of the base station between the multi-mode terminals 310 and 320 may be minimized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (19)

As a communication method of the terminal,
When the base station is decomposed, starting a mode change when the terminal ends a random backoff timer; and
Operating the terminal as a base station after the mode change is completed
/ RTI > In claim 1,
The random backoff delay time calculated by the random backoff timer is determined according to the state information of the terminal. In claim 2,
The status information includes the remaining battery information of the terminal. In claim 2,
The random backoff delay time is a time until the terminal determines the mode change attempt. In claim 1,
The terminal is a multi-mode terminal that can operate as a base station or a relay station. As a communication method of the terminal,
Calculating, by the terminal, a value of the backoff timer, and
If the terminal receives a radio signal before the backoff timer expires, stopping the mode change by the terminal
/ RTI > The method of claim 6,
The terminal is a multi-mode terminal that can operate as a base station or a relay station. The method of claim 6,
Wherein the calculating step comprises:
Calculating a value of the backoff timer based on state information of the terminal. 9. The method of claim 8,
The status information includes the remaining battery information of the terminal. The method of claim 9,
The value of the back off timer decreases as the battery level of the terminal increases, and the value of the back off timer increases as the battery level of the terminal decreases. The method of claim 6,
The radio signal includes a preamble. The method of claim 6,
The value of the back off timer has a random value within a certain range. As a communication method of the terminal,
Calculating, by the terminal, a value of the backoff timer, and
When the terminal does not receive the preamble before the backoff timer expires, the terminal performing a mode change
/ RTI > In claim 13,
And performing the mode change is performed after the backoff timer expires. In claim 13,
The terminal is a multi-mode terminal that can operate as a base station or a relay station. In claim 13,
Wherein the calculating step comprises:
Calculating a value of the backoff timer based on state information of the terminal. 17. The method of claim 16,
The status information includes the remaining battery information of the terminal. The method of claim 17,
The value of the back off timer decreases as the battery level of the terminal increases, and the value of the back off timer increases as the battery level of the terminal decreases. In claim 13,
The value of the back off timer has a random value within a certain range.
KR1020120075359A 2011-07-11 2012-07-11 Method for communication of terminal KR20130007989A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/546,543 US20130017817A1 (en) 2011-07-11 2012-07-11 Method for communication of base station and terminal
US14/050,989 US20140038580A1 (en) 2011-07-11 2013-10-10 Method for communication of base station and terminal

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020110068543 2011-07-11
KR20110068543 2011-07-11
KR20120022938 2012-03-06
KR1020120022938 2012-03-06

Publications (1)

Publication Number Publication Date
KR20130007989A true KR20130007989A (en) 2013-01-21

Family

ID=47838247

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120075359A KR20130007989A (en) 2011-07-11 2012-07-11 Method for communication of terminal

Country Status (1)

Country Link
KR (1) KR20130007989A (en)

Similar Documents

Publication Publication Date Title
EP2637468B1 (en) Relay station and reconnection method
US20130084871A1 (en) Radio base station and method of controlling the same
EP2341746B1 (en) Mobile station
CN102870469A (en) Mobile communication terminal and method in mobile communication system
US9451544B2 (en) Base station, radio terminal and radio communication system
US8588180B2 (en) Mobile communication system, mobile station, base station, and handover controlling method
US9961711B2 (en) Control device to control direct communication among communication terminals
JPWO2008096407A1 (en) Terminal, random access signal transmission method, and base station
WO2020034807A1 (en) Condition switching method and device
US20130084874A1 (en) Radio base station and method of controlling the same
KR101990915B1 (en) Multimode apparatus and communicaton menthod thereof
US8503333B2 (en) Reestablishment of an interface between nodes in a network using a backoff time
US20170163309A1 (en) Wireless terminal, wireless station, wireless communication system, and wireless communication method
US9813956B2 (en) Base station device and handover control method
CN111565478A (en) Pseudo network equipment identification method, device, equipment and storage medium
KR20130007989A (en) Method for communication of terminal
CN113038551B (en) Auxiliary cell group Failure SCG Failure processing method and device
WO2021029796A1 (en) Methods for maintaining an ongoing communication even after site outage
KR101920488B1 (en) Method for relaying of base station and method for communication of terminal
US8798668B2 (en) Call control system and call control method
CN102378362B (en) Method for processing concurrent inter-local area cell reselection and incoming call paging
CN111093223B (en) Method and device for solving problem that service cell cannot provide service
CN111565477B (en) Network connection method, wireless station, and storage medium
JP2011205330A (en) Radio communication system and closing control method
WO2013094201A1 (en) Radio relay apparatus, wireless communication method and processor

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination