CN102811497A - Method, terminal and system for accessing network - Google Patents

Abstract

The embodiment of the invention provides a method, a terminal and a system for accessing the network. In the method, a relay channel is established between a served terminal in which the information channel quality is lower than a first set value and a relay terminal in which the information channel quality is higher than a second set value, and the relay terminal with the higher information channel quality is used for connecting the served terminal with the lower channel information quality with the Internet. Compared with the scheme that the served terminal in which the channel quality is lower than the first set value is directly connected with the network side in the prior art, the data transmission rate between the served terminal and the relay terminal can be guaranteed by the relay channel, and because the information channel quality of the relay terminal is better, the data transmission rate between the relay terminal and the network side is guaranteed, so that data can be transmitted at a high data transmission rate between the served terminal and the network side, and the business with high requirement on the data transmission rate can be successfully carried out.

Description

Method, terminal and system for accessing network

technical field

The present invention relates to the technical field of wireless communication, in particular to a method, terminal and system for accessing a network.

Background technique

With the development of wireless communication technology, in order to ensure the smooth execution of various services, various services have put forward higher and higher requirements for data transmission rates.

In order to meet the data transmission rate requirements of various services, in the long term evolution (LTE, long termevolution) system, for terminals that are closer to the base station, due to the ideal channel quality of the terminal, the stability of data transmission is better, in order to improve the data For the transmission rate, a multi-input-multi-output (MIMO, multi-input-output) technology or a high-order modulation and coding method may be used to increase the data transmission rate, so as to meet the data transmission rate requirements of services executed in the terminal.

For terminals that are far away from the base station or in an environment with many obstacles, due to their unsatisfactory channel quality, multi-antenna diversity or inter-cell cooperation technology can be used, or relay stations can be used to extend coverage. Enhance the channel quality of the terminal to ensure the stability of data transmission as much as possible.

Although multi-antenna diversity or inter-cell cooperation technology, or the use of relay stations to expand coverage can be used to enhance the reliability and stability of terminal data transmission with unsatisfactory channel quality, when there are business needs that require high data transmission rates During implementation, it is still difficult to significantly increase the data transmission rate of terminals with unsatisfactory channel quality, and it is difficult to ensure that the data transmission rate of the terminal can meet the needs of the service, making it difficult to guarantee the smooth execution of the service.

Contents of the invention

Embodiments of the present invention provide a method, terminal and system for accessing a network to solve the problem in the prior art that it is difficult for terminals with unsatisfactory channel quality to perform data transmission at a relatively high data transmission rate.

A method of accessing a network, the method comprising:

Establishing a relay channel between the served terminal whose channel quality is lower than the first set value and the relay terminal whose channel quality is higher than the second set value;

The served terminal sends an access instruction to the relay terminal through the relay channel, requesting the relay terminal to connect the served terminal to the network side;

After receiving the random access success indication message sent by the relay terminal, the served terminal sends a radio resource control RRC connection establishment complete message to the relay terminal through the relay channel.

A method of accessing a network, the method comprising:

The relay terminal whose channel quality is higher than the second set value establishes a relay channel with the served terminal whose channel quality is lower than the first set value;

The relay terminal receives the access indication sent by the served terminal through the relay channel, and the access indication requires the relay terminal to connect the served terminal to the network side;

After receiving the access indication, the relay terminal establishes a communication tunnel between itself and the network side, and sends a random access success indication message to the served terminal through the relay channel.

A terminal, the channel quality of the terminal is lower than a first set value, and the terminal includes:

A relay channel establishment module, configured to establish a relay channel with a relay terminal whose channel quality is higher than a second set value;

The first sending module is configured to send an access instruction to the relay terminal through the relay channel, requiring the relay terminal to connect the terminal whose channel quality is lower than the first set value to the network side;

The first receiving module is configured to receive a random access success indication message sent by the relay terminal after establishing a communication tunnel with the network side after receiving the access indication;

The second sending module is configured to send a radio resource control RRC connection establishment complete message to the relay terminal through the relay channel after the first receiving module receives the random access success indication message.

A terminal, the channel quality of the terminal is higher than a second set value, and the terminal includes:

A relay channel establishment module, configured to establish a relay channel with a served terminal whose channel quality is lower than a first set value;

The first receiving module is configured to receive an access instruction sent by the service terminal through the relay channel, and the access instruction requires that the terminal whose channel quality is higher than the second set value will be connected to the network side by the service terminal;

The first sending module is configured to establish a communication tunnel between itself and the network side after receiving the access indication, and send a random access success indication message to the served terminal through the relay channel.

A system for accessing a network, including a served terminal and a relay terminal, wherein:

The served terminal is configured to establish a relay channel with the relay terminal when its own channel quality is lower than a first set value, send an access indication to the relay terminal through the relay channel, and receive After receiving the random access success indication message sent by the relay terminal, send a radio resource control RRC connection establishment completion message to the relay terminal through the relay channel;

The relay terminal is configured to establish a relay channel with the served terminal when its own channel quality is higher than a second set value, receive the access indication sent by the served terminal, and receive the access indication And after establishing a communication tunnel with the network side, send a random access success indication message to the served terminal through the relay channel.

In the solution provided by the embodiment of the present invention, by establishing a relay channel between the served terminal whose channel quality is lower than the first set value and the relay terminal whose channel quality is higher than the second set value, the An excellent relay terminal connects the served terminal with poor channel quality to the network. Compared with the prior art scheme in which the served terminal whose channel quality is lower than the first set value is directly connected to the network side, the relay terminal can be used to The channel ensures the data transmission rate between the served terminal and the relay terminal, and because the channel quality of the relay terminal is better, it can ensure the data transmission rate between the relay terminal and the network side, thus ensuring the connection between the served terminal and the network. Data transmission can be performed at a high data transmission rate between the two sides, ensuring the smooth execution of services that require a high data transmission rate.

Description of drawings

FIG. 1 is a schematic flow chart of steps for accessing a network provided by Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of signaling interaction between a relay terminal and a served terminal according to Embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of a terminal provided in Embodiment 2 of the present invention;

FIG. 4 is a schematic structural diagram of a terminal provided by Embodiment 3 of the present invention;

FIG. 5 is a schematic structural diagram of a system for accessing a network provided by Embodiment 4 of the present invention.

Detailed ways

In view of the problem that terminals with unsatisfactory channel quality in the prior art are difficult to transmit data at a high data transmission rate, and cannot guarantee the smooth execution of services requiring high data transmission rates, in the solution provided by the embodiment of the present invention, the implementation The use of short-distance communication technology or long-distance communication technology between terminals in the LTE system to support data relay between the control plane and the terminal plane can effectively improve the transmission rate of terminals with poor channel quality or terminals in blind spots, thereby improving LTE. The throughput and coverage of the system meet the needs of higher data rate transmission.

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and various embodiments.

Embodiment one,

Embodiment 1 of the present invention provides a method for accessing a network. The step flow of the method is shown in FIG. 1 , and specifically includes the following steps:

Step 101, establishing a relay channel between the served terminal and the relay terminal.

The served terminal refers to a terminal whose channel quality is lower than a first set value, and the relay terminal refers to a terminal whose channel quality is higher than a second set value.

When the served terminal needs to access the network side, a process of relay discovery and negotiation is performed with the relay terminal, and a relay channel is established.

The relay channel can be established based on short-distance communication technology, such as 802.11x WLAN protocol, and of course, the relay channel can also be established by long-distance communication technology, such as CDMA, TD-SCDMA, LTE, etc.

Step 102, the served terminal sends an access indication to the relay terminal through the relay channel.

After establishing a relay channel with the relay terminal, the served terminal sends an access instruction to the relay terminal through the relay channel, requesting the relay terminal to connect the served terminal to the network side.

The access indication may be sent, but not limited to, through MAC layer or RRC layer signaling, and preferably, the access indication may include the identifier of the served terminal.

The signaling format of the access indication may be as shown in Table 1. The access indication includes a relay indication signaling identifier and a terminal identifier. The relay indication signaling identifier is used to identify the signaling as an access indication signaling, and the terminal identifier is used to identify the served terminal.

Relay Indication Signaling Identifier Terminal ID

Table 1

Step 103, the relay terminal initiates a random access procedure.

The relay terminal can perform random access based on a non-contention manner. Specifically, the relay terminal sends MSG3 (that is, a radio resource control (RRC, RadioResource Control) connection establishment request message) to the network side according to the received access indication, and the RRC connection establishment request message includes the served The identity of the terminal.

In the existing random access process of a terminal, the RRC connection establishment request message sent by the terminal carries the identity of the terminal itself that initiates the random access process, and is used to indicate to the network side that the terminal needs to access the network side. In this step, the relay terminal needs to report the identity of the served terminal to indicate that the network side relay terminal is performing an access/connection establishment request for the served terminal to perform relay services. Of course, the RRC connection establishment The request message may also carry the identifier of the relay terminal. The format of the fields that need to be added in the RRC connection establishment request message can be shown in Table 2.

ID of relay indication Relay Terminal ID Identified by the service terminal

Table 2

Wherein, the identifier of the relay indication is used to indicate that the RRC connection establishment request message is an access/connection establishment request message performed for the served terminal to perform relay service.

Of course, in this step, the relay terminal may also perform random access based on contention. Then this step specifically includes:

In the first step, the relay terminal sends a preamble to the network side according to the received access indication.

After receiving the pilot code sent by the relay terminal, the network side will return a randomly assigned cell-radio network temporary identifier (C-RNTI, cell-Radio Network Temporary Identifier) to the relay terminal.

Step 2: After receiving the C-RNTI returned by the network side, the relay terminal sends MSG3 to the network side.

The MSG3 includes the C-RNTI and the identity of the served terminal, and the network side can determine the terminal that is assigned the C-RNTI to replace the The terminal represented by the identifier of the service terminal performs relay access. Of course, the MSG3 message may also carry the identifier of the relay terminal.

Step 104, the relay terminal receives the RRC connection establishment message sent by the network side.

After receiving the RRC connection establishment request message sent by the relay terminal, the network side returns MSG4 (that is, the RRC connection establishment message) to the relay terminal.

Step 105, the relay terminal sends a random access success indication message to the served terminal.

After receiving the RRC connection establishment message sent by the network side, the relay terminal establishes a communication tunnel with the network side, and at this time, the relay terminal may send a random access success indication message to the served terminal. When the relay channel is established based on the 802.11x WLAN protocol, the relay terminal may send a random access success indication message to the served terminal through the WLAN interface.

The random access success indication message may include current master information block (MIB, MasterInformation Block) information, system broadcast information block (SIB, System Information Block) information, and the relay terminal performs a random access process on behalf of the served terminal Assigned C-RNTI and transparently forwarded MSG4.

Step 106, the served terminal sends an RRC connection establishment complete message to the relay terminal through the relay channel.

After receiving the random access success indication message, the served terminal extracts the system information and MSG4, builds the system information block SIB1, and configures the physical layer (PHY, Physical) parameters of the LTE wireless interface, so that the relay channel can be used Send an RRC connection establishment complete message to the relay terminal. Specifically, the served terminal bypasses the communication tunnel between the relay terminal and the network side to the relay channel, and sends an RRC connection establishment completion message to the relay terminal through the relay channel, instructing the relay terminal to transfer the communication tunnel to the relay terminal through the communication tunnel. The RRC connection establishment complete message is sent to the network side.

The communication tunnel may be, but not limited to, a tunnel based on Packet Data Convergence Protocol (PDCP, Packet Data Convergence Protocol) or a MAC tunnel based on the media access layer.

The network side may be represented by a base station eNB. When the relay channel is a channel established based on the 802.11xWLAN protocol, this step specifically includes: the service terminal bypasses the communication tunnel between the relay terminal and the network side to the WLAN interface, and sends an RRC connection establishment via the WLAN interface The completion message is sent to the relay terminal, and the relay terminal sends the RRC connection establishment completion message to the base station eNB through the communication tunnel.

The RRC connection establishment completion message sent by the service terminal to the relay terminal may also include a non-access stratum (NAS, non-access stadium)-based attach request and a packet data network (PDN, packet data network) connection request. After the relay terminal sends the RRC connection establishment complete message to the eNB through the communication tunnel, the eNB can send the NAS-based attach request and PDN connection request carried in the RRC connection establishment complete message to the mobility management through the standard S1 interface Entity (MME, Mobility Management Entity).

The subsequent authentication and security activation process on the network side (MME) is consistent with the existing protocol, and the relevant signaling interaction between the served terminal and the network side can still be performed through the relay terminal, and will not be repeated here.

When the served terminal is in the RRC-CONNECTED state, the reference signal received power (RSRP, Reference Signal Received Power) can be periodically measured according to the configuration information on the network side:

If the RSRP of the current cell exceeds the first threshold, the served terminal can access the network side through the current cell. Through the uplink MAC layer control element (MAC CE, MAC Control Element), directly use the C-RNTI, RRC connection and NAS state assigned by the relay terminal agent during the random access process of the service terminal, and stop the communication tunnel to the relay channel Bypass instead, the radio link control (RLC, Radio Link Control) layer is used to bear the transmission of the communication tunnel packet data unit (PDU, Packet data unit).

If the RSRP of the neighboring cell exceeds the second threshold, the served terminal may access the network side through the neighboring cell. If the RSRP of the adjacent cell exceeds the second threshold, the served terminal can generate a measurement event that can trigger handover, and transmit the measurement event to the eNB through the communication tunnel to trigger the handover process, and carry the relevant RRC connection through the communication tunnel Signaling is reconfigured so that the served terminal will access the adjacent cell.

Step 107, the served terminal returns to the RRC-IDLE state.

After the MME sends the terminal context release message, triggering the eNB to release the RRC connection, and the served terminal returns to the RRC-IDLE state, if the served terminal needs to transmit services again, the served terminal can request the relay terminal to be served by the served terminal again On the access network side, perform steps 101 to 106 again.

When the served terminal is in the RRC-IDLE state: the relay terminal can monitor the paging channel according to the terminal identifier of the served terminal, and if the relay terminal detects that there is a signaling for paging the served terminal on the network side, it will notify the served terminal The terminal accesses the network. Specifically, when the relay terminal detects that the system information change indication systemInfo Value Tag in the system information block SIB1 changes or detects the system broadcast message change indication, it receives the updated system broadcast message and sends the updated system broadcast message to By service terminal. In the existing protocol, the served terminal itself needs to monitor the paging of the network side to the served terminal, but in this embodiment, the relay terminal is required to replace the served terminal to monitor the paging of the network side to the served terminal paging message, then the relay terminal sends the paging message to the served terminal, and the served terminal can send a reception confirmation message to the relay terminal to confirm that the paging message has been received, as shown in Figure 2, the relay terminal and Schematic diagram of the signaling interaction of the served terminal; the relay terminal can also monitor the paging channel, and if the relay terminal detects that the terminal ID in the paging message matches the terminal ID of the served terminal, it can notify the served terminal to respond to the paging message, access to the network side.

Of course, when the served terminal receives the network access notification sent by the relay terminal, it can judge whether the channel quality of the served terminal is lower than the first set value at this time, and if so, re-execute steps 101 to 106 , otherwise, access to the network side according to the existing access procedure.

The terminal identifier may be, but not limited to, an International Mobile Subscriber Identification Number (IMSI, International Mobile Subscriber Identification Number).

According to the solution provided in Embodiment 1 of the present invention, not only can a relay terminal with better channel quality act as a proxy for a served terminal with a lower channel quality to access the network side, but also achieve a higher connection between the served terminal and the network side. The data transmission rate is used for data transmission. At the same time, during the communication process between the served terminal and the network side, that is, when the served terminal is in the RRC-CONNECTED state, if the RSRP of the current cell or the adjacent cell reaches a certain threshold value, The served terminal can also access the network side through the current cell or the adjacent cell, so that when the channel quality of the served terminal is improved, the method of accessing the network side from the current cell or the adjacent cell can further improve the quality of the served terminal. When the relay channel is a channel established based on the WLAN protocol, fast and smooth switching from WLAN RELAY to LTE transmission is realized. When the served terminal is in the RRC-IDLE state, the relay terminal can be used to monitor the change of the system broadcast message, or monitor the paging message, and detect that the system broadcast message changes, or there is a When the terminal identifier matches the paging message, notify the served terminal to re-connect to the network side, so as to use the relay terminal to realize the agent of system message forwarding and paging agent, and ensure that when the network side needs to communicate with the served terminal, the served terminal The service terminal can access the network side in time. Of course, when there is a new service to be executed by the served terminal, the relay terminal may also actively request the relay terminal to be connected to the network side by the served terminal, so as to ensure the smooth execution of the new service.

Based on the same inventive concept as the method provided in Embodiment 1 of the present invention, Embodiment 2 to Embodiment 4 of the present invention provide the following terminals and systems.

Embodiment two,

In the terminal provided by Embodiment 2 of the present invention, the channel quality of the terminal is lower than the first set value. The schematic structural diagram of the terminal is shown in FIG. 3 , including:

The relay channel establishment module 11 is used to establish a relay channel with a relay terminal whose channel quality is higher than the second set value; the first sending module 12 is used to send an access indication to the relay terminal through the relay channel, The relay terminal is required to connect the terminal whose channel quality is lower than the first set value to the network side; the first receiving module 13 is used to establish a communication tunnel with the network side after the relay terminal receives the access instruction The random access success indication message sent later; the second sending module 14 is configured to send the radio resource control RRC connection to the relay terminal through the relay channel after the first receiving module receives the random access success indication message Build complete message.

The first sending module 12 is specifically configured to send the access instruction carrying the identifier of the served terminal.

The first sending module 12 is specifically configured to send an access indication to the relay terminal based on medium access control MAC layer signaling or radio resource control RRC layer signaling through a relay channel.

The second sending module 14 is specifically configured to bypass the communication tunnel between the relay terminal and the network side to the relay channel, and send an RRC connection establishment completion message to the relay terminal through the relay channel, instructing the relay terminal to pass The communication tunnel sends the RRC connection establishment completion message to the network side.

The determining module 15 included in the terminal is used to determine that the channel quality of the terminal in the RRC-IDLE state at the current moment is lower than first set value.

The terminal also includes:

The measurement module 16 is used for the second sending module to send the radio resource control RRC connection establishment complete message to the network side, when the terminal is in the RRC-CONNECTED state, according to the configuration information of the network side, the current cell where the terminal itself is located and the neighbors of the current cell The reference signal received power RSRP of the cell is periodically measured;

The access module 17 is configured to access the network side through the current cell when the measurement module measures that the RSRP of the current cell exceeds a first threshold, or when the measurement module measures that the RSRP of the neighboring cell exceeds a second threshold When the limit value is reached, access the network side through the neighbor cell.

Embodiment three,

In the terminal provided by Embodiment 3 of the present invention, the channel quality of the terminal is higher than the second set value. The schematic structural diagram of the terminal is shown in FIG. 4 , including:

The relay channel establishment module 21 is used to establish a relay channel with the served terminal whose channel quality is lower than the first set value;

The first receiving module 22 is configured to receive an access indication sent by the service terminal through the relay channel, and the access indication requires that the terminal whose channel quality is higher than the second set value will be accessed by the service terminal to the network side;

The first sending module 23 is configured to establish a communication tunnel between itself and the network side after receiving the access indication, and send a random access success indication message to the served terminal through the relay channel.

The terminal also includes:

The second sending module 24 is configured to initiate a random access procedure to the network side when receiving the access indication;

The second receiving module 25 is configured to receive the RRC connection establishment message sent by the network side;

The first sending module 23 is specifically configured to send a random access success indication message to the served terminal through the relay channel when the second receiving module receives the RRC connection establishment message sent by the network side.

The second sending module 24 is specifically configured to send the RRC connection establishment request message carrying the identifier of the served terminal to the network side.

The first receiving module 22 is also used to receive the RRC connection establishment completion message sent by the service terminal through the relay channel;

The second sending module 24 is further configured to send the RRC connection establishment completion message to the network side through the communication tunnel between the terminal itself and the network side.

The terminal also includes a monitoring module 26 for monitoring the paging channel according to the terminal identifier of the served terminal when the served terminal is in the RRC-IDLE state. The signaling of the service terminal notifies the service terminal to access the network.

The monitoring module 26 is specifically configured to receive an updated system broadcast message and broadcast the updated system broadcast message when it detects that the system information change indication systemInfo Value Tag in the system information block SIB1 changes or detects a system broadcast message change indication. The message is sent to the served terminal.

The monitoring module 26 can also be used to monitor the paging channel when the served terminal is in the RRC-IDLE state, if the terminal identification included in the paging message and the terminal identification of the served terminal are monitored when the paging channel is monitored match, then notify the served terminal to respond to the paging message and access the network side.

Embodiment four,

Embodiment 4 of the present invention provides a system for accessing a network. The structural diagram of the system is shown in FIG. 5 , including a served terminal 31 and a relay terminal 32, wherein:

The served terminal 31 is configured to establish a relay channel with the relay terminal when its own channel quality is lower than a first set value, send an access indication to the relay terminal through the relay channel, and After receiving the random access success indication message sent by the relay terminal, sending a radio resource control RRC connection establishment completion message to the relay terminal through the relay channel;

The relay terminal 32 is configured to establish a relay channel with the served terminal when its own channel quality is higher than a second set value, receive the access instruction sent by the served terminal, and receive the access instruction After instructing and establishing a communication tunnel with the network side, send a random access success indication message to the served terminal through the relay channel.

As shown in Figure 5, the network side may include a base station, a mobility management entity, a serving gateway, a packet data network gateway, and a home user server: the mobility management entity may be connected to the base station, and the serving gateway may also be connected to the connected to the base station. Moreover, the mobility management entity may be further connected to the home user server, and the serving gateway may be further connected to the packet data network gateway.

And as shown in FIG. 5 , the served terminal and the relay terminal can communicate through the 802.11g/n protocol, and the relay terminal and the network side can communicate through the standard LTE wireless communication interface.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (28)

1. A method for accessing a network, characterized in that the method comprises: Establishing a relay channel between the served terminal whose channel quality is lower than the first set value and the relay terminal whose channel quality is higher than the second set value; The served terminal sends an access instruction to the relay terminal through the relay channel, requesting the relay terminal to connect the served terminal to the network side; After receiving the random access success indication message sent by the relay terminal, the served terminal sends a radio resource control RRC connection establishment complete message to the relay terminal through the relay channel. 2. The method according to claim 1, wherein the relay channel is based on short distance communication technology, code division multiple access CDMA, time division synchronous code division multiple access TD-SCDMA and long term evolution LTE wireless communication technology Any kind of relay channel. 3. The method according to claim 1, wherein the access indication carries an identifier of the served terminal. 4. The method according to claim 1, wherein the served terminal sends an access indication to the relay terminal through the relay channel, comprising: The served terminal sends an access indication to the relay terminal based on medium access control MAC layer or radio resource control RRC layer signaling through the relay channel. 5. The method according to claim 1, wherein the served terminal sends a radio resource control RRC connection establishment complete message to the relay terminal through the relay channel, specifically comprising: The served terminal bypasses the communication tunnel between the relay terminal and the network side to the relay channel, and sends an RRC connection establishment completion message to the relay terminal through the relay channel, instructing the relay terminal to connect the RRC connection through the communication tunnel The establishment complete message is sent to the network side. 6. The method according to claim 1, characterized in that, after the served terminal sends a radio resource control RRC connection establishment complete message to the network side, the method further comprises: When the served terminal is in the RRC-CONNECTED state, periodically measure the reference signal received power RSRP of the current cell where it is located and the neighboring cells of the current cell according to the configuration information on the network side: If it is measured that the RSRP of the current cell exceeds the first threshold value, the served terminal accesses the network side through the current cell; If it is measured that the RSRP of the neighboring cell exceeds the second threshold value, the served terminal accesses the network side through the neighboring cell. 7. The method according to claim 1, wherein after the served terminal sends a radio resource control RRC connection establishment complete message to the relay terminal, the method further comprises: When the served terminal is in the RRC-IDLE state, if it receives a notification from the access network side sent by the relay terminal, it determines that its own channel quality at the current moment is lower than the first set value. 8. A method for accessing a network, characterized in that the method comprises: The relay terminal whose channel quality is higher than the second set value establishes a relay channel with the served terminal whose channel quality is lower than the first set value; The relay terminal receives the access indication sent by the served terminal through the relay channel, and the access indication requires the relay terminal to connect the served terminal to the network side; After receiving the access indication, the relay terminal establishes a communication tunnel between itself and the network side, and sends a random access success indication message to the served terminal through the relay channel. 9. The method according to claim 8, wherein after receiving the access instruction, the relay terminal establishes a communication tunnel between itself and the network side, and sends a random Access success indication message, specifically including: The relay terminal initiates a random access process to the network side according to the received access indication; After receiving the RRC connection establishment message sent by the network side, the relay terminal sends a random access success indication message to the served terminal through the relay channel. 10. The method according to claim 9, wherein the relay terminal initiates a random access process to the network side according to the received access indication, specifically comprising: The relay terminal sends an RRC connection establishment request message carrying the identifier of the served terminal to the network side. 11. The method according to claim 8, wherein after the relay terminal sends a random access success indication message to the served terminal through the relay channel, the method further comprises: The relay terminal receives the RRC connection establishment complete message sent by the service terminal through the relay channel, and sends the RRC connection establishment complete message to the network side through the communication tunnel between itself and the network side. 12. The method according to claim 8, wherein after the relay terminal sends a random access success indication message to the served terminal through the relay channel, the method further comprises: When the served terminal is in the RRC-IDLE state, the relay terminal monitors the paging channel according to the terminal identifier of the served terminal; If the relay terminal detects that there is a signaling for paging the served terminal on the network side when monitoring the paging channel, it notifies the served terminal to access the network. 13. The method according to claim 11, wherein if the relay terminal detects that there is a signaling for paging the served terminal on the network side when monitoring the paging channel, it notifies the served terminal to access the network, specifically including : When the relay terminal detects that the system information change indication systemInfoValue Tag in the system information block SIB1 changes or detects the system broadcast message change indication, it receives the updated system broadcast message and sends the updated system broadcast message to the served terminal. 14. The method according to claim 8, wherein after the relay terminal sends a random access success indication message to the served terminal through the relay channel, the method further comprises: When the served terminal is in the RRC-IDLE state, the relay terminal monitors the paging channel; If the relay terminal detects that the terminal identifier included in the paging message matches the terminal identifier of the served terminal when monitoring the paging channel, it notifies the served terminal to respond to the paging message and access the network side. 15. A terminal, wherein the channel quality of the terminal is lower than a first set value, and the terminal comprises: A relay channel establishment module, configured to establish a relay channel with a relay terminal whose channel quality is higher than a second set value; The first sending module is configured to send an access instruction to the relay terminal through the relay channel, requiring the relay terminal to connect the terminal whose channel quality is lower than the first set value to the network side; The first receiving module is configured to receive a random access success indication message sent by the relay terminal; The second sending module is configured to send a radio resource control RRC connection establishment complete message to the relay terminal through the relay channel after the first receiving module receives the random access success indication message. 16. The terminal according to claim 15, characterized in that, The first sending module is specifically configured to send the access instruction carrying the identifier of the served terminal. 17. The terminal according to claim 15, wherein the first sending module is specifically configured to, through a relay channel, send a message to the relay based on medium access control MAC layer signaling or radio resource control RRC layer signaling The terminal sends an access indication. 18. The terminal according to claim 15, wherein the second sending module is specifically configured to bypass the communication tunnel between the relay terminal and the network side to a relay channel, and send The RRC connection establishment complete message is sent to the relay terminal, instructing the relay terminal to send the RRC connection establishment complete message to the network side through the communication tunnel. 19. The terminal according to claim 15, characterized in that, the terminal comprises a determining module, configured to determine if a notification from the access network side sent by the relay terminal is received when the terminal is in the RRC-IDLE state The channel quality of the terminal in the RRC-IDLE state at the current moment is lower than the first set value. 20. The terminal according to claim 15, further comprising: The measurement module is used for the second sending module to send the radio resource control RRC connection establishment completion message to the network side, when the terminal is in the RRC-CONNECTED state, according to the configuration information of the network side, the current cell where the terminal is located and the neighbors of the current cell The reference signal received power RSRP of the cell is periodically measured; An access module, configured to access the network side through the current cell when the measurement module measures that the RSRP of the current cell exceeds a first threshold, or when the measurement module measures that the RSRP of the neighboring cell exceeds a second threshold When the limit value is reached, access the network side through the neighbor cell. 21. A terminal, characterized in that the channel quality of the terminal is higher than a second set value, and the terminal comprises: A relay channel establishment module, configured to establish a relay channel with a served terminal whose channel quality is lower than a first set value; The first receiving module is configured to receive an access instruction sent by the service terminal through the relay channel, and the access instruction requires that the terminal whose channel quality is higher than the second set value will be connected to the network side by the service terminal; The first sending module is configured to establish a communication tunnel between itself and the network side after receiving the access indication, and send a random access success indication message to the served terminal through the relay channel. 22. The terminal according to claim 21, further comprising: The second sending module is configured to initiate a random access process to the network side when receiving the access indication; The second receiving module is configured to receive the RRC connection establishment message sent by the network side; The first sending module is specifically configured to send a random access success indication message to the served terminal through the relay channel when the second receiving module receives the RRC connection establishment message sent by the network side. 23. The terminal of claim 21, wherein: The second sending module is specifically configured to send the RRC connection establishment request message carrying the identifier of the served terminal to the network side. 24. The terminal according to claim 21, wherein the first receiving module is further configured to receive the RRC connection establishment completion message sent by the service terminal through the relay channel; The second sending module is further configured to send the RRC connection establishment completion message to the network side through the communication tunnel between the terminal itself and the network side. 25. The terminal according to claim 21, further comprising a monitoring module, configured to monitor the paging channel according to the terminal identifier of the served terminal when the served terminal is in the RRC-IDLE state, if When monitoring the paging channel, if it is detected that there is a signaling for paging the served terminal on the network side, the served terminal is notified to access the network. 26. The terminal according to claim 25, wherein the monitoring module is specifically configured to detect a change in the system information change indication systemInfo Value Tag in the system information block SIB1 or detect a system broadcast message change indication Afterwards, the updated system broadcast message is received, and the updated system broadcast message is sent to the served terminal. 27. The terminal according to claim 21, characterized in that, the terminal further comprises a monitoring module, configured to monitor the paging channel when the served terminal is in the RRC-IDLE state, and monitor the paging channel if it is monitoring the paging channel When the terminal identifier included in the paging message matches the terminal identifier of the served terminal, the served terminal is notified to respond to the paging message and access the network side. 28. A system for accessing a network, characterized in that it includes a served terminal and a relay terminal, wherein: The served terminal is configured to establish a relay channel with the relay terminal when its own channel quality is lower than a first set value, send an access indication to the relay terminal through the relay channel, and receive After receiving the random access success indication message sent by the relay terminal, send a radio resource control RRC connection establishment completion message to the relay terminal through the relay channel; The relay terminal is configured to establish a relay channel with the served terminal when its own channel quality is higher than a second set value, receive the access indication sent by the served terminal, and receive the access indication And after establishing a communication tunnel with the network side, send a random access success indication message to the served terminal through the relay channel.

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