KR101994233B1 - Communication method for relay, terminal and communication method thereof - Google Patents

Abstract

A repeater, a terminal, and a communication method thereof are disclosed. A terminal serving as a repeater receives a message including scanning interval information from an upper layer base station, and the terminal transmits a message including the scanning interval information to a lower layer terminal. The terminal receives radio synchronization from an upper base station according to the scanning interval information.

Description

Technical Field [0001] The present invention relates to a repeater communication method, a communication method of a terminal,

The present invention relates to a repeater communication method, and a communication method of a terminal and a terminal.

In the event of a disaster or a disaster, critical infrastructure may be destroyed or damaged. A variety of communication facilities such as wireless telephones, landline telephones and internet networks are considered to be important facilities for social infrastructures. If such communication facilities are destroyed or damaged, social congestion may increase and it may be difficult to secure social restoration capability.

Therefore, it is important to support High Reliability, which provides a way to quickly repair or replace communication facilities.

In particular, if a base station that plays a key role in communication of a mobile terminal is damaged or a power line is destroyed and can not serve as a base station, a service disabled area may occur.

Thus, it is necessary to provide means for providing wireless communication service in a service disabled area due to damage of the base station.

A problem to be solved by the present invention is to provide a wireless communication service even when a base station is damaged.

According to an embodiment of the present invention, a communication method of a terminal is provided. The method comprising: selecting a terminal acting as a repeater; Receiving a first message including scanning interval information from an upper layer base station; Transmitting a second message including the scanning interval information to a lower-layer terminal that is constructed by the terminal and receives a service; And receiving radio synchronization from the base station according to the scanning interval information.

The communication method of the terminal may further include transmitting a third message requesting the scanning interval information to the higher layer base station.

The step of receiving the first message may include receiving the first message from the higher-level base station when the terminal initially accesses the higher-level base station.

The first message and the second message may include a field of the scan period, a start superframe index field, a start frame index field, and an interleaving interval field.

The third message may include a scanning interval control field and a synchronization search interval control field.

The step of transmitting the second message may include transmitting the second message to the lower terminal when receiving the scanning request message from the lower terminal.

The terminal can operate in the TTR relay mode.

According to another embodiment of the present invention, a communication method of a repeater is provided. Selecting a repeater relaying between a lower terminal of the base station and the base station if there is a problem with the base station; Receiving a first message including scanning interval information from the base station; Transmitting a second message including the scanning interval information to the lower terminal; And receiving radio synchronization from the base station according to the scanning interval information.

The communication method of the repeater may further include transmitting a message requesting the scanning interval information to the base station.

The step of receiving the first message may include receiving the first message from the base station when the repeater initially accesses the base station.

The first message and the second message may include a field of the scan period, a start superframe index field, a start frame index field, and an interleaving interval field.

According to another embodiment of the present invention, a terminal is provided. The terminal includes an RF module; And a process of connecting to the RF module, wherein the process is selected as a terminal performing a role of a relay and, when receiving scanning interval information from an upper level base station, transmitting a message including the scanning interval information to a lower terminal And receive wireless synchronization from the upper base station according to the scanning interval information.

The process may request the higher layer base station for the scanning interval information.

The message may include a field of the scan interval, a start superframe index field, a start frame index field, and an interleaving interval field.

According to the embodiment of the present invention, a relay mode multi-function terminal or a separate mobile repeater can establish a temporary network in a service disabled area and continue to provide communication services to the lower terminals.

According to the embodiment of the present invention, the mobile repeater or the relay mode multi-function terminal can synchronize with the higher-level base station even when the mobile terminal is located in the room or in the room, so that it can perform normal operation.

1 is a diagram illustrating a case where a BS is damaged in a mobile communication system according to an embodiment of the present invention.
FIG. 2 is a block diagram of a mobile repeater / relay mode multi-function terminal according to an exemplary embodiment of the present invention receiving a radio synchronization (A-Preamble) from a superordinate HR- Fig.
FIG. 3 is a block diagram illustrating a structure of a mobile repeater / relay mode multi-function terminal 130 'according to another embodiment of the present invention. Preamble ").≪ / RTI >
FIG. 4 is a diagram illustrating a mobile repeater / relay mode multi-function terminal 130 '(Mobile RS or HR-MS serving as relay) according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out 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 order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, a mobile station (MS) is referred to as a terminal, a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS) a reliability mobile station (HR-MS), a subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment And may include all or some of the functions of the terminal, MT, AMS, HR-MS, SS, PSS, AT, UE,

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) BS, RS, HR, RS, etc.) may be referred to as a high reliability relay station (HR-RS) -RS, and the like.

Now, a repeater communication method, a terminal, and a communication method thereof will be described in detail with reference to the drawings.

1 is a diagram illustrating a case where a BS is damaged in a mobile communication system according to an embodiment of the present invention.

A mobile communication system according to an embodiment of the present invention includes a base station 200 and lower terminals 110, 120 and 130 in a cell served by the base station 200. Hereinafter, the BS 200 is referred to as a 'Superordinate High-Reliability Base Station (Superordinate HR-BS)'.

In the case where the superordinate HR-BS 200 is damaged, a service disabled area occurs and a problem occurs in the mobile communication service of the lower terminals 110, 120, and 130. However, in the embodiment of the present invention, , 130 are selected as a relay. Hereinafter, a terminal selected as a terminal performing a repeater role will be referred to as a 'High-Reliability Mobile Station acting as relay' (HR-MS acting as relay). The selected HR-MS acting as relay 130 acts as a repeater to construct and operate the ad-hoc network, and the lower terminals 110 and 120 can continue to receive services.

As described above, the MS can perform the role of a repeater, but a mobile relay station (Mobile RS) that communicates with the superordinate HR-BS 200 can construct and operate a temporary network. Although not shown in FIG. 1, a mobile RS is located inside a cell served by a superordinate HR-BS 200. The mobile terminals (110, 120, 130) can continue to receive service by the mobile RS.

Hereinafter, a mobile RS or a relay-mode MS-acting as relay for constructing and operating a temporary network will be collectively referred to as " Mobile RS or HR-MS " acting as relay '.

The mobile RS or MS-acting as relay according to an exemplary embodiment of the present invention operates in a TTI (Timing-transmit and receive) relay mode. In order to construct and operate a temporary network, a mobile repeater / relay mode multi-function terminal (Mobile RS or HR-MS serving as relay) operating in the TTR relay mode is connected to a superordinate HR- ). A mobile repeater / relay mode multi-function terminal (Mobile RS or MS-acting as relay) can receive radio synchronization (A-Preamble) from a superordinate HR-BS 200 at initial connection. However, even when the mobile repeater / relay mode multi-function terminal (Mobile RS or MS-acting as relay) moves or is located indoors, the A-Preamble from the superordinate HR- Is needed. In other words, in addition to the initial connection with the MS 200, the MS 200 is connected to the superordinate HR-BS 200 through a relay link, (A-Preamble) from the base station (BS).

Hereinafter, a mobile repeater / relay mode multi-function terminal operating in a TTR relay mode transmits an A-Preamble from a superordinate HR-BS 200 via a relay link, Will be described.

A method for establishing a relay link with a mobile station (MS) or a relay station (MS) as a relay station (MS) is described in IEEE 802.16n or IEEE 802.16m And therefore, detailed description thereof will be omitted.

FIG. 2 is a block diagram of a mobile repeater / relay mode multi-function terminal according to an exemplary embodiment of the present invention receiving a radio synchronization (A-Preamble) from a superordinate HR- Fig. In FIG. 2, a mobile repeater / relay mode multi-function terminal (Mobile RS or HR-MS acting as relay) 130 is represented as a mobile repeater / relay mode multiple function terminal 130 ' ), And the subordinate HR-MSs to which the ad-hoc network is continuously constructed are denoted by 110 '. Subordinate HR-MSs may correspond to the lower terminals 110 and 120 in FIG.

First, the mobile repeater / relay mode multi-function terminal 130 '(Mobile RS or HR-MS serving as relay) transmits a synchronization request message (Advanced Air Interface Multimode Relay Synchronization Request, AAI-MMRS-SYN-REQ) (S220). A synchronization request message AAI-MMRS-SYN-REQ transmitted by the mobile repeater / relay mode multi-function terminal 130 ', Mobile RS or HR-MS acting as relay, And the like.

Table 1 below is a table showing the format of the synchronization request message (AAI-MMRS-SYN-REQ). As shown in Table 1, the synchronization request message AAI-MMRS-SYN-REQ includes a scan duration control field and a time interval control field. The mobile repeater / relay mode multi-function terminal 130 ', Mobile RS, or HR-MS acting as relay is transmitted to the higher-level base station 200 through a synchronization request message AAI-MMRS-SYN- (A-Preamble) from the HR-BS.

For example, if the movement speed of the mobile repeater / relay mode multi-function terminal 130 ', Mobile RS or HR-MS acting as relay is high or the mobile repeater / relay mode multiple function terminal 130' acting as a relay is located in the room, and errors of the A-preamble frequently occur. In this case, the mobile repeater / relay mode multi-function terminal 130 ', the Mobile RS or the MS-acting as relay, transmits the content requesting to set the scanning interval to be longer and the synchronous search interval to be shorter, -MMRS-SYN-REQ) to the superordinate HR-BS (200).

AAI-MMRS-SYN-REQ message format Field Size (bits) Value / Description Condition Scan duration control One 0b0: increase the time duration
0b1: decrease the time duration Time interval control One 0b0: increase the time interval
0b1: decrease the time interval

The superordinate HR-BS 200 that has received the synchronization request message (AAI-MMRS-SYN-REQ) through the relay link sets a scan duration corresponding to the request information. In other words, the mobile repeater / relay mode multi-function terminal 130 'receives a radio synchronization (A-Preamble) of the superordinate HR-BS 200 and transmits a synchronization timing offset In order to enable tracking, the high-order base station 200 sets a scan duration (Scan duration). The superordinate HR-BS 200 transmits the synchronous response message including the scan duration (AAI-MMRS-SYN-RSP) to the mobile repeater / relay mode multi- (130 ', Mobile RS or HR-MS acting as relay) (S240).

Table 2 below shows the format of the synchronization response message (AAI-MMRS-SYN-RSP). As shown in Table 2, the synchronization response message AAI-MMRS-SYN-RSP includes not only a scan duration field, but also a start superframe index field, a start frame index field, And an interleaving interval field. The mobile RS / MS-MS acting as relay 130 'receiving the synchronous response message (AAI-MMRS-SYN-RSP) includes a superordinate HR-BS 200, (A-Preamble) from the base station.

AAI-MMRS-SYN-RSP message format Field Size (bits) Value / Description Condition Scan duration 8 Duration (in units of AAI subframe) of the requested scanning period. If (scan duration> 0) { Start superframe index 6 Represents the 6 least significant bits of the absolute superframe index in which the first scanning interval starts. Start frame index 2 Represents start frame number in the start super frame number.
0b00: 1st frame in the super frame
0b01: 2nd frame in the super frame
0b10: 3rd frame in the super frame
0b11: 4th frame in the super frame Interleaving interval 8 The period of relay mode HR-MS's active mode (in units of AAI subframes) is interleaved between scan durations. } // End if (Scan duration> 0)

The mobile repeater / relay mode multi-function terminal 130 ', which receives the synchronous response message AAI-MMRS-SYN-RSP, transmits the synchronous advertisement including the scan duration information (AAI-MM-ADV) message to its subordinate HR-MSs (S260).

Table 3 below shows the format of the synchronous advertisement message (AAI-MM-ADV). As shown in Table 3, the synchronization advertisement message (AAI-MM-ADV) also includes a scan duration, a start superframe index field, a start frame index field, and an interleaving interval ) Field. Table 3 is a modification of the multi-mode message (AAI-MM-ADV) message format defined in the IEEE 802.16m standard including the contents of the embodiment of the present invention. That is, the parameters shown in Table 3 below are added to the parameters of the multi-mode message (AAI-MM-ADV) in the existing IEEE 802.16m.

AAI-MM-ADV message format Field Size (bits) Value / Description Condition Action Type 4 Used to indicate the purpose of this message
0b1000: Scanning operation for HR-MS as relay to maintain synchronization with the serving HR-BS
0b1001 - 0b1111: reserved .... } else if (Action Type == 0b1000) { Scan duration 8 Duration (in units of AAI subframe) of the requested scanning period. Interleaving interval 8 The period of relay mode HR-MS's active mode (in units of AAI subframes) is interleaved between scan durations. Start superframe index 6 Represents the 6 least significant bits of the absolute superframe index in which the first scanning interval starts. Start frame index 2 Represents start frame number in the start super frame number.
0b00: 1st frame in the super frame
0b01: 2nd frame in the super frame
0b10: 3rd frame in the super frame
0b11: 4th frame in the super frame }

In this manner, the MS / MS-MS relay as well as the mobile RS or HR-MS acting as relay transmits the synchronization advertisement message AAI-MM-ADV to its subordinate HR-MSs 110 ' The reason for the transmission is as follows. During a period in which the mobile repeater / relay mode multi-function terminal 130 ', Mobile RS or HR-MS acting as relay receives radio synchronization (A-Preamble) from the superordinate HR-BS 200, 110 ', subordinate HR-MSs). Therefore, the mobile repeater / relay mode multi-function terminal 130 ', Mobile RS or HR-MS acting as relay transmits the synchronization advertisement message AAI-MM-ADV to the subordinate HR-MSs 110' , And also performs scanning of the lower terminals 110 '(Subordinate MSs) when the mobile repeater / relay mode multi-function terminal 130', Mobile RS or HR-MS acting as relay receives radio synchronization (A-Preamble) . In other words, the subordinate HR-MSs 110 'are received in the interval in which the mobile repeater / relay mode multi-function terminal 130', Mobile RS or HR-MS acting as relay receives the A-Preamble Communication with the mobile repeater / relay-mode multi-function terminal 130 '(Mobile RS or HR-MS serving as relay) is cut off, thereby preventing malfunction from occurring.

In the above description, the mobile repeater / relay mode multi-function terminal (M130 ', Mobile RS or HR-MS acting as relay) transmits the subordinate HR-MSs A general scanning request message (AAI-SCN-REQ) for sub-terminals 110 ', which is not a synchronous advertisement message (AAI-MM-ADV) It is possible to perform unicast transmission through a scanning response message (Advanced Air Interface Scan Response, AAI-SCN-RSP). That is, the subordinate HR-MSs transmit the scanning request message (AAI-SCN-REQ) to the mobile repeater / relay mode multiple function terminal 130 '(Mobile RS or HR-MS acting as relay) SCN-RSP) including the information of Table 3 is transmitted to the subscriber stations 110 ', 120', and 120 'in the mobile repeater / relay mode multi-function terminal 130' , Subordinate HR-MSs).

The mobile relay / relay mode multi-function terminal 130 ', the Mobile RS or the HR-MS acting as relay transmits the synchronization advertisement message (AAI-MM-ADV) or the scanning response message The mobile relay station or the relaying mode multi-function terminal 130 'transmits the AAI-SCN-RSP to the mobile station or the relay station, (A-preamble) from the superordinate HR-BS 200 in accordance with the scan duration (S280) and tracks the synchronization timing offset (S280). Also, the sub-terminals 110 ', subordinate HR-MSs may perform scanning according to a scan duration (S280).

Meanwhile, the superordinate HR-BS 200 does not receive the synchronization request message AAI-MMRS-SYN-REQ but transmits only the synchronization acknowledgment message AAI-MMRS-SYN-RSP to the mobile repeater / 130 ', Mobile RS or HR-MS acting as relay). Hereinafter, a description will be made with reference to FIG.

FIG. 3 is a block diagram illustrating a structure of a mobile repeater / relay mode multi-function terminal 130 'according to another embodiment of the present invention. Preamble "). ≪ / RTI >

3, when the mobile repeater / relay mode multi-function terminal 130 '(Mobile RS or HR-MS serving as relay) initially makes a network entry to the superordinate HR-BS 200 (S320 , The superordinate HR-BS 200 first transmits the synchronization response message AAI-MMRS-SYN-RSP as shown in Table 2 to the mobile repeater / relay mode multiple function terminal 130 ', Mobile RS or HR-MS acting as relay. That is, without receiving the synchronization request message (AAI-MMRS-SYN-REQ), the upper layer base station 200 transmits only the synchronization acknowledgment message AAI-MMRS-SYN-RSP to the mobile repeater / (130 ', Mobile RS or HR-MS acting as relay) to set an initial value for wireless synchronization reception.

2, the mobile repeater / relay mode multi-function terminal 130 ', the mobile RS or the HR-MS acting as a relay transmits a synchronization advertisement message AAI-MM-ADV or a scanning response message AAI- ) To subordinate HR-MSs, and notifies (S360).

2, the mobile repeater / relay mode multi-function terminal 130 ', the Mobile RS or the HR-MS serving as relay is connected to a scan duration (scan duration) set by the superordinate HR-BS 200 (A-preamble) from the superordinate HR-BS 200 and tracks the synchronization timing offset (S380). Subordinate HR-MSs may also perform scanning according to a scan duration (S380).

According to the embodiment of the present invention, when a mobile repeater / relay mode multiple function terminal 130 'acting as a TTR relay mode is connected to a superordinate HR-BS 200 And can receive radio synchronization (A-Preamble). Accordingly, even if the mobile repeater / relay mode multi-function terminal 130 ', Mobile RS or HR-MS acting as relay is moving or is located indoors, it can synchronize wirelessly with the superordinate HR-BS 200 Normal operation can be performed.

FIG. 4 is a diagram illustrating a mobile repeater / relay mode multi-function terminal 130 '(Mobile RS or HR-MS serving as relay) according to an embodiment of the present invention.

Referring to FIG. 4, the mobile repeater / relay mode multi-function terminal 130 ', the mobile RS or the MS-acting as relay, includes a processor 132, a memory 134, and a radio frequency (RF) module 136 ). Processor 132 may be configured to implement the procedures and methods described above. The memory 134 is coupled to the processor 132 and stores various information related to the operation of the processor 132. [ The RF module 136 is coupled to the processor 132 and transmits or receives radio signals. The mobile repeater / relay mode multi-function terminal 130 ', Mobile RS or HR-MS acting as relay may have a single antenna or multiple antennas.

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 (15)

Selecting as a terminal performing a repeater role;
Transmitting a synchronization request message including a content of a scanning interval request set based on a state of the selected terminal to an upper layer base station through a predetermined relay link;
Receiving a synchronization response message including a scanning interval set corresponding to the synchronization request message from the upper layer base station;
Receiving wireless synchronization from the base station and estimating a synchronization timing offset based on the scanning interval set by the synchronization response message;
And transmitting a first message including scanning interval information, which is information on the scanning interval, to a lower-layer terminal that is constructed and installed in the temporary network by the selected terminal after receiving the synchronization response message,
The scanning interval information transmitted to the lower-layer terminal induces the lower-layer terminal to perform scanning while the selected terminal is receiving the wireless synchronization
A communication method of a terminal. The method according to claim 1,
Wherein the content of the scanning interval request includes a scan interval control field for setting one of increasing a time interval or decreasing the time interval and setting a synchronization interval for setting one of increasing a time interval or decreasing the time interval A search interval control field
A communication method of a terminal. The method according to claim 1,
And the step of receiving the synchronization response message comprises receiving the synchronization response message from the higher-level base station when the selected terminal initially accesses the higher-level base station. 4. The method according to any one of claims 1 to 3,
Wherein the synchronization response message and the first message include a field of the scanning interval, a starting superframe index field, a starting frame index field, and an interleaving interval field. The method according to claim 1,
Wherein the content of the scanning interval request is set based on a moving speed of the selected terminal. The method according to claim 1,
Wherein the step of transmitting the first message comprises the step of transmitting the first message to the lower terminal when receiving the scanning request message from the lower terminal. The method according to claim 1,
And the selected terminal operates in a TTR relay mode. delete delete delete delete As a terminal,
RF module; And
And a processor connected to the RF module and controlling the terminal to be selected as a terminal acting as a repeater,
The processor comprising:
Transmitting a synchronization request message including a content of a scanning interval request, which is set based on a state of the selected terminal, to an upper layer base station through a predetermined relay link,
Receiving a synchronization response message including a scanning interval set corresponding to the synchronization request message from the upper layer base station,
Receiving wireless synchronization from the base station and estimating a synchronization timing offset based on the scanning interval set by the synchronization response message,
A first message including scanning interval information, which is information on the scanning interval, after the synchronization response message is received is transmitted to a lower-layer terminal constructed and provided by the temporary network by the selected terminal,
The scanning interval information transmitted to the lower-layer terminal induces the lower-layer terminal to perform scanning while the selected terminal is receiving the wireless synchronization
Terminal. 13. The method of claim 12,
Wherein the content of the scanning interval request includes a scan interval control field for setting one of increasing a time interval or decreasing the time interval and setting a synchronization interval for setting one of increasing a time interval or decreasing the time interval A terminal comprising a search interval control field. The method according to claim 12 or 13,
Wherein the synchronization response message and the first message include a field of the scanning interval, a starting superframe index field, a starting frame index field, and an interleaving interval field. 13. The method of claim 12,
Wherein the content of the scanning interval request is set based on a moving speed of the selected terminal.

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