CN109842961B - Method and device for shortening eMTC user initial access delay - Google Patents

Abstract

The invention discloses a method and a device for shortening the initial access delay of an eMTC user, which relate to the technical field of communication, and the method comprises the following steps: after receiving an RRC Connection Setup message ACK fed back by an eMTC user, a base station sends a first uplink authorization message for the eMTC user to send the RRC Connection Setup Complete message; and the base station performs corresponding processing according to the RRC Connection Setup Complete message sent by the eMTC user by using the first uplink authorization message, so that the eMTC user completes initial access. The invention greatly shortens the time delay of the eMTC user initial access by carrying out the advanced uplink authorization on the eMTC user in the initial access process.

Description

A method and device for shortening the initial access delay of eMTC users

technical field

The invention relates to the field of communication technology, in particular to a method and device for shortening an eMTC user's initial access delay.

Background technique

When an eMTC (enhanced Machine Type Communication, enhanced machine type communication) user initially accesses, after the competition is resolved, as shown in Figure 1, it is necessary to send an SR (Scheduling Request, scheduling request) to the base station to apply for uplink authorization to send an uplink BSR (Buffer Status Report, cache status report), after the base station schedules SR to allocate uplink grants to UEs, UEs use the allocated uplink grants to send uplink BSRs, and the base station allocates uplink grants to UEs according to the size of the received uplink BSRs, and UEs use the allocated uplink grants to send RRC Connection Setup Complete message. In this process, the UE and the base station need to communicate three times to send the RRC (Radio Resource Control, radio resource control) message that needs to be sent to the base station, which takes a long time to complete. Considering that the eMTC channel supports multiple repeated transmissions and can The configured BLCE (Bandwidth-reduced Low-complexity and Coverage Enhanced, bandwidth reduced low-complexity and coverage enhanced) sending subframe (MPDCCH (MTC Physical Downlink Control Channel, machine type communication physical downlink control channel) can be sent repeatedly up to 256 times, PUSCH (Physical Uplink Shared Channel, physical uplink shared channel) can be sent repeatedly up to 1024 times, at least one uplink BLCE subframe is configured every 40ms for eMTC users to send uplink data), which can take up to several seconds and may cause access failure . In addition, too many scheduling uplink grants also reduce the base station's scheduling opportunities for other UEs, which affects the improvement of the overall throughput of the cell.

The same problem exists when UE sends subsequent UE Capability Information, Security Mode Complete and RRCConnection Reconfiguration Complete messages.

Contents of the invention

The technical problem solved by the solution provided according to the embodiment of the present invention is that there are too many interactions in sending uplink data and too large access delay when eMTC users access.

According to an embodiment of the present invention, a method for shortening the initial access delay of an eMTC user includes:

After receiving the RRC Connection Setup message ACK (Acknowledgment, confirmation character) fed back by the eMTC user, the base station sends to the eMTC user a first uplink authorization message for sending the RRC Connection SetupComplete message to the eMTC user;

The base station performs corresponding processing according to the RRC ConnectionSetup Complete message sent by the eMTC user using the first uplink authorization message, so that the eMTC user completes the initial access;

Wherein, the eMTC refers to enhanced machine type communication; the RRC refers to radio resource control; the RRCConnection Setup refers to RRC connection establishment; the RRC Connection Setup Complete refers to the completion of RRC connection establishment; the ACK refers to an acknowledgment character.

Preferably, the base station performs corresponding processing according to the RRCConnection Setup Complete message sent by the eMTC user using the first uplink authorization message, so that the eMTC user completes the initial access including:

The base station sends a UE Capability Inquiry message to the eMTC user according to the RRC ConnectionSetup Complete message sent by the eMTC user using the first uplink authorization message;

After receiving the UE Capability Inquiry message ACK fed back by the eMTC user, the base station sends to the eMTC user a second uplink authorization message for sending the UE Capability Information message to the eMTC user;

The base station performs corresponding processing according to the UE CapabilityInformation message sent by the eMTC user using the second uplink authorization message, so that the eMTC user completes the initial access;

Wherein, the UE Capability Inquiry refers to UE capability inquiry; the UE CapabilityInformation refers to UE capability information.

Preferably, the base station performs corresponding processing according to the UECapability Information message sent by the eMTC user using the second uplink authorization message, so that the eMTC user completes the initial access including:

The base station sends a Security Mode Command message to the eMTC user according to the UE CapabilityInformation message sent by the eMTC user using the second uplink authorization message;

After receiving the Security Mode Command message ACK fed back by the eMTC user, the base station sends to the eMTC user a third uplink authorization message for sending a Security Mode Complete message to the eMTC user;

The base station performs corresponding processing according to the Security ModeComplete message sent by the eMTC user using the third uplink authorization message, so that the eMTC user completes the initial access;

Wherein, the Security Mode Command refers to the security mode command; the Security ModeComplete refers to the completion of the security mode.

Preferably, the base station performs corresponding processing according to the SecurityMode Complete message sent by the eMTC user using the third uplink authorization message, so that the eMTC user completes the initial access including:

The base station sends an RRC Connection Reconfiguration message to the eMTC user according to the Security ModeComplete message sent by the eMTC user using the third uplink authorization message;

After receiving the RRC Connection Reconfiguration message ACK fed back by the eMTC user, the base station sends to the eMTC user a fourth uplink authorization message for the eMTC user to send an RRC Connection Reconfiguration Complete message;

After receiving the RRC ConnectionReconfiguration Complete message sent by the eMTC user using the fourth uplink authorization message, the base station enables the eMTC user to complete the initial access;

Wherein, the RRC Connection Reconfiguration refers to the RRC connection reconfiguration; the RRCConnection Reconfiguration Complete refers to the completion of the RRC connection reconfiguration.

Preferably, the first uplink authorization message includes information that the size of the transmission block is the length of the RRC Connection SetupComplete message; the second uplink authorization message includes information that the size of the transmission block is the length of the UE CapabilityInformation message; the third uplink authorization The message includes the information that the transmission block size is the length of the Security ModeComplete message; the fourth uplink authorization message includes the information that the transmission block size is the length of the RRC ConnectionReconfiguration Complete message.

According to an embodiment of the present invention, a device for shortening the initial access delay of an eMTC user includes:

The sending module is configured to send to the eMTC user a first uplink authorization message for sending the RRC Connection Setup Complete message to the eMTC user after receiving the RRC Connection Setup message ACK fed back by the eMTC user;

The initial access module is configured to perform corresponding processing according to the RRCConnection Setup Complete message sent by the eMTC user using the first uplink authorization message, so that the eMTC user completes the initial access;

Wherein, the eMTC refers to enhanced machine type communication; the RRC refers to radio resource control; the RRCConnection Setup refers to RRC connection establishment; the RRC Connection Setup Complete refers to the completion of RRC connection establishment; the ACK refers to an acknowledgment character.

Preferably, the initial access module is further configured to send a UE CapabilityEnquiry message to the eMTC user according to the RRC Connection Setup Complete message sent by the eMTC user using the first uplink authorization message, and upon receiving the After the UE Capability Inquiry message fed back by the eMTC user is ACK, send to the eMTC user a second uplink authorization message for the eMTC user to send a UE Capability Information message, and use the second uplink authorization according to the eMTC user The UE CapabilityInformation message sent by the message is processed accordingly, so that the eMTC user completes the initial access;

Wherein, the UE Capability Inquiry refers to UE capability inquiry; the UE CapabilityInformation refers to UE capability information.

Preferably, the initial access module is further configured to send a Security Mode Command message to the eMTC user according to the UE Capability Information message sent by the eMTC user using the second uplink authorization message, and upon receiving the UE Capability Information message, After the Security Mode Command message fed back by the eMTC user is ACK, send a third uplink authorization message for the eMTC user to send a Security Mode Complete message to the eMTC user, and use the third uplink authorization message according to the eMTC user's use of the third uplink authorization message. The Security Mode Complete message sent by the message is processed accordingly, so that the eMTC user completes the initial access;

Wherein, the Security Mode Command refers to the security mode command; the Security ModeComplete refers to the completion of the security mode.

Preferably, the initial access module is further configured to send an RRC ConnectionReconfiguration message to the eMTC user according to the Security Mode Complete message sent by the eMTC user using the third uplink authorization message, and upon receiving the After the RRC ConnectionReconfiguration message fed back by the eMTC user is ACK, send to the eMTC user a fourth uplink authorization message for the eMTC user to send the RRC ConnectionReconfiguration Complete message, and use the fourth uplink authorization message after receiving the eMTC user to use the fourth uplink authorization After sending the RRC Connection Reconfiguration Complete message, the eMTC user completes the initial access;

Wherein, the RRC Connection Reconfiguration refers to the RRC connection reconfiguration; the RRCConnection Reconfiguration Complete refers to the completion of the RRC connection reconfiguration.

Preferably, the first uplink authorization message includes information that the size of the transmission block is the length of the RRC Connection SetupComplete message; the second uplink authorization message includes information that the size of the transmission block is the length of the UE CapabilityInformation message; the third uplink authorization The message includes the information that the transmission block size is the length of the Security ModeComplete message; the fourth uplink authorization message includes the information that the transmission block size is the length of the RRC ConnectionReconfiguration Complete message.

According to the solution provided by the embodiment of the present invention, this method shortens the initial access delay and reduces The number of times the base station schedules the UE is reduced, so that the saved scheduling opportunity can be used for uplink scheduling of other UEs in the cell, which is beneficial to the improvement of the uplink throughput of the cell.

Description of drawings

Fig. 1 is an interactive flow chart of an eMTC UE initial access process provided by an embodiment of the present invention without prior uplink authorization after contention is resolved;

Fig. 2 is a flow chart of a method for shortening the initial access delay of an eMTC user provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a device for shortening the initial access delay of an eMTC user provided by an embodiment of the present invention;

FIG. 4 is a flow chart of eMTC UE initial access signaling provided by an embodiment of the present invention;

Fig. 5 is an interactive flow chart of performing uplink authorization in advance after the contention is resolved in the eMTC UE initial access process provided by an embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Fig. 2 is a flow chart of a method for shortening the initial access delay of an eMTC user provided by an embodiment of the present invention, as shown in Fig. 2 , including:

Step S201: After receiving the RRC Connection Setup message ACK fed back by the eMTC user, the base station sends to the eMTC user a first uplink authorization message for the eMTC user to send the RRC Connection Setup Complete message;

Step S202: The base station performs corresponding processing according to the RRCConnection Setup Complete message sent by the eMTC user using the first uplink authorization message, so that the eMTC user completes the initial access.

Wherein, the base station performs corresponding processing according to the RRCConnection Setup Complete message sent by the eMTC user using the first uplink authorization message, so that the eMTC user completes initial access includes: the base station uses the The RRC Connection Setup Complete message sent by the first uplink authorization message sends a UE Capability Inquiry message to the eMTC user; after receiving the UE Capability Inquiry message ACK fed back by the eMTC user, the base station sends the eMTC user a The eMTC user sends the second uplink authorization message of the UECapability Information message; the base station performs corresponding processing according to the UE Capability Information message sent by the eMTC user using the second uplink authorization message, so that the eMTC user completes the initial connection enter.

Wherein, the base station performs corresponding processing according to the UECapability Information message sent by the eMTC user using the second uplink authorization message, so that the eMTC user completes initial access includes: the base station uses the second uplink authorization message according to the eMTC user 2. The UE Capability Information message sent by the uplink authorization message sends a Security Mode Command message to the eMTC user; after receiving the Security Mode Command message ACK fed back by the eMTC user, the base station sends the eMTC user the The eMTC user sends the third uplink authorization message of the SecurityMode Complete message; the base station performs corresponding processing according to the Security Mode Complete message sent by the eMTC user using the third uplink authorization message, so that the eMTC user completes the initial access.

Wherein, the base station performs corresponding processing according to the SecurityMode Complete message sent by the eMTC user using the third uplink authorization message, so that the eMTC user completes initial access includes: the base station uses the third uplink authorization message according to the eMTC user 3. The Security Mode Complete message sent by the uplink authorization message, and the RRC Connection Reconfiguration message is sent to the eMTC user; after receiving the RRCConnection Reconfiguration message ACK fed back by the eMTC user, the base station sends the eMTC user to the eMTC user The user sends the fourth uplink authorization message of the RRCConnection Reconfiguration Complete message; after receiving the RRC Connection Reconfiguration Complete message sent by the eMTC user using the fourth uplink authorization message, the base station enables the eMTC user to complete the initial access.

Specifically, the first uplink authorization message includes information that the size of the transmission block is the length of the RRC Connection SetupComplete message; the second uplink authorization message includes information that the size of the transmission block is the length of the UE CapabilityInformation message; the third uplink The authorization message includes the information that the transmission block size is the length of the Security ModeComplete message; the fourth uplink authorization message includes the information that the transmission block size is the length of the RRC ConnectionReconfiguration Complete message.

That is to say, after the base station receives the ACK to the RRC Connection Setup message sent by the eMTC user, it sends to the eMTC user the first uplink authorization message used to make the eMTC user send the RRC Connection Setup Complete message; After the RRC Connection Setup Complete message sent by the eMTC user sends the UE Capability Inquiry message to the eMTC user, according to the ACK of the UECapabilityEnquiry message from the eMTC user, send the message to the eMTC user to enable the eMTC The user sends the second uplink authorization message of the UECapability Information message; the base station performs corresponding processing according to the UECapability Information message sent by the eMTC user, so that the eMTC user completes the initial access. Specifically, the base station performs corresponding processing according to the UE Capability Information message sent by the eMTC user, so that the eMTC user completes the initial access including: the base station downloads to the eMTC user according to the UE Capability Information message sent by the eMTC user After sending the Security Mode Command message, according to the ACK of the eMTC user to the SecurityMode Command message, send to the eMTC user a third message for the eMTC user to send the Security Mode Complete message to the eMTC user. Uplink authorization message: after the base station sends the RRCConnection Reconfiguration message to the eMTC user according to the Security Mode Complete message sent by the eMTC user using the third uplink authorization message, according to the ACK of the RRC ConnectionReconfiguration message by the eMTC user , sending to the eMTC user a fourth uplink authorization message for enabling the eMTC user to send an RRCConnection Reconfiguration Complete message; the base station receives the RRC Connection Reconfiguration Complete message sent by the eMTC user using the fourth uplink authorization message After that, make the eMTC user complete the initial access.

Fig. 3 is a schematic diagram of a device for shortening the initial access delay of an eMTC user provided by an embodiment of the present invention. As shown in Fig. 3, it includes: a sending module 301, which is used to receive the RRC Connection Setup message ACK fed back by the eMTC user, Send the first uplink authorization message for the eMTC user to send the RRC Connection Setup Complete message to the eMTC user; the initial access module 302 is used to send the first uplink authorization message according to the eMTC user using the first uplink authorization message The RRC Connection Setup Complete message is processed accordingly, so that the eMTC user completes the initial access.

Wherein, the initial access module 302 is further configured to send a UE CapabilityEnquiry message to the eMTC user according to the RRC Connection Setup Complete message sent by the eMTC user using the first uplink authorization message, and upon receiving the After the UE Capability Inquiry message fed back by the eMTC user is ACK, send to the eMTC user a second uplink authorization message for the eMTC user to send a UE Capability Information message, and use the second uplink authorization according to the eMTC user The UE CapabilityInformation message sent by the message is processed accordingly, so that the eMTC user completes the initial access.

Wherein, the initial access module 302 is further configured to send a Security Mode Command message to the eMTC user according to the UE Capability Information message sent by the eMTC user using the second uplink authorization message, and upon receiving the UE Capability Information message, After the Security Mode Command message fed back by the eMTC user is ACK, send a third uplink authorization message for the eMTC user to send a Security Mode Complete message to the eMTC user, and use the third uplink authorization message according to the eMTC user's use of the third uplink authorization message. The Security Mode Complete message sent by the message is processed accordingly, so that the eMTC user completes the initial access.

Wherein, the initial access module 302 is further configured to send an RRC ConnectionReconfiguration message to the eMTC user according to the Security Mode Complete message sent by the eMTC user using the third uplink authorization message, and upon receiving the After the RRC ConnectionReconfiguration message fed back by the eMTC user is ACK, send to the eMTC user a fourth uplink authorization message for the eMTC user to send the RRC ConnectionReconfiguration Complete message, and use the fourth uplink authorization message after receiving the eMTC user to use the fourth uplink authorization After sending the RRC Connection Reconfiguration Complete message, the eMTC user completes the initial access.

Specifically, the first uplink authorization message includes information that the size of the transmission block is the length of the RRC Connection SetupComplete message; the second uplink authorization message includes information that the size of the transmission block is the length of the UE CapabilityInformation message; the third uplink The authorization message includes the information that the transmission block size is the length of the Security ModeComplete message; the fourth uplink authorization message includes the information that the transmission block size is the length of the RRC ConnectionReconfiguration Complete message.

As shown in Figure 4 and Figure 5, when the eMTC user initially accesses, once the UE contention is successfully resolved, the base station receives the HARQ (Hybrid Automatic Repeat reQuest, hybrid automatic repeat request) feedback of the RRCConnection Setup message as ACK, that is, The eMTC UE performs uplink authorization to schedule the RRC Connection Setup Complete message, and the TBSize (Transport Block Size) corresponding to the authorization is the length of the RRC Connection Setup Complete message. The UE sends the RRC Connection Setup Complete message according to the received uplink authorization, thereby eliminating the need to send an SR to wait for the base station to authorize the uplink BSR, and then send an uplink BSR to wait for the base station to authorize the uplink data.

Similar to this, when the base station receives the HARQ feedback of the UE Capability Enquiry message as ACK, it performs uplink authorization for the eMTC UE to schedule the UE Capability Information message, and the TBSize corresponding to the authorization is the length of the UECapability Information message.

When the base station receives the HARQ feedback of the Security Mode Command message as ACK, it performs uplink authorization to the eMTC UE to schedule the Security Mode Complete message, and the TBSize corresponding to the authorization is the length of the Security ModeComplete message.

When the base station receives the HARQ feedback of the RRC Connection Reconfiguration message as ACK, it performs uplink authorization for the eMTC UE to schedule the RRC Connection Reconfiguration Complete message, and the TBSize corresponding to the authorization is the length of the RRC Connection Reconfiguration Complete message.

When the base station successfully receives the RRC Connection Reconfiguration Complete message, the initial access of the UE is completed.

This method saves the process of UE sending SR. For UEs with strong processing capabilities, the data of RRC Connection Setup Complete can be prepared quickly after feeding back Msg4 ACK on PUCCH. At this time, the base station authorizes the UE uplink in advance. RRC Connection Setup Complete data can be received in advance. For UEs with weak processing capabilities, even if the base station grants uplink authorization in advance, the UE will only send some padding data. When the data is ready, it will request uplink authorization from the base station by sending SR and send RRC Connection Setup Complete to the base station. Padding The sending of data will not affect the reception of RRC Connection Setup Complete by the base station. The same is true for UECapability Information, Security Mode Complete and RRC Connection ReconfigurationComplete messages.

That is to say, for a UE with strong processing capability, the base station can effectively shorten the access delay of the UE by granting uplink in advance. For UEs with weaker processing capabilities, the uplink early authorization method adopted by the base station has no impact on the access process of the UE, and the UE still sends signaling messages to the base station by sending an SR request.

The embodiment of the present invention is only aimed at the initial access scenario of the eMTC UE. After the UE contention is resolved successfully, early uplink authorization for the UE is started. The specific steps are:

1. The eMTC UE initiates contention random access, sends a Preamble to the base station, and the base station sends a RAR (Random Access Response, Random Access Response) to the UE after detecting the Preamble, and the UE uses the UL Grant (Uplink Scheduling Grant, uplink scheduling grant) in the RAR Send the RRC Connection Request message and carry the contention resolution Id in the message. After receiving the RRC Connection Request message, the base station sends the RRC Connection Setup message to the UE, and carry the contention resolution Id in the RRC Connection Request message in the message.

2. When the base station receives the feedback of RRC Connection Setup as ACK, it considers that the UE contention has been successfully resolved, and then starts the uplink authorization of the RRC Connection Setup Complete message of the UE, and the authorization size is the MAC (Media Access Control Media Access Control) of the RRC Connection Setup Complete message. Intervene in the control layer) PDU (Protocol Data Unit, protocol data unit) length (usually around 92Byte), and send DCI6-0A/B (Downlink Control Information, downlink control information) through the MPDCCH channel to notify the UE of the size of the uplink grant.

3. When the base station successfully receives the RRC Connection Setup Complete message, it sends the UECapability Inquiry message to the UE, and after receiving the feedback of the UE Capability Inquiry message as ACK, it starts the uplink authorization of the UE Capability Information message of the UE, and the authorization size is UE The MAC PDU length of the CapabilityInformation message (usually around 103Byte), and send DCI6-0A/B through the MPDCCH channel to notify the UE.

4. After the base station successfully receives the UE Capability Information message, it sends a Security Mode Command message to the UE, and after receiving the feedback of the Security Mode Command message as ACK, it starts the uplink authorization of the UE's Security Mode Complete message, and the authorization size is Security Mode Complete The MAC PDU length of the message (usually around 9Byte), and send DCI6-0A/B through the MPDCCH channel to notify the UE.

5. When the base station successfully receives the Security Mode Complete message, it sends the RRC ConnectionReconfiguration message to the UE, and after receiving the feedback of the RRC Connection Reconfiguration message as ACK, it starts the uplink authorization of the UE's RRC Connection Reconfiguration Complete message, and the authorization size is RRCConnection The MAC PDU length of the Reconfiguration Complete message (usually around 168Byte), and send DCI6-0A/B through the MPDCCH channel to notify the UE.

6. After the base station successfully receives the RRC Connection Reconfiguration Complete message, the UE access is completed, and the early uplink authorization for the UE is stopped.

According to the solution provided by the embodiment of the present invention, the initial access delay of the eMTC user is greatly shortened by performing uplink authorization in advance to the eMTC user during the initial access process.

Although the present invention has been described in detail above, the present invention is not limited thereto, and various modifications can be made by those skilled in the art based on the principle of the present invention. Therefore, any modifications made according to the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims (8)

1. A method for shortening the initial access delay of an eMTC user comprises the following steps:

after receiving an RRC Connection Setup message ACK fed back by an eMTC user, a base station sends a first uplink authorization message for the eMTC user to send the RRC Connection Setup Complete message;

the base station performs corresponding processing according to the RRC Connection Setup Complete message sent by the eMTC user by using the first uplink authorization message, so that the eMTC user completes initial access;

wherein the eMTC refers to enhanced machine type communication; the RRC is a radio resource control; the RRCConnection Setup is RRC connection establishment; the RRCConnection Setup Complete means that RRC connection establishment is completed; the ACK refers to an acknowledgement character;

wherein, the base station performs corresponding processing according to the RRC Connection Setup Complete message sent by the eMTC user by using the first uplink grant message, so that the eMTC user completes initial access includes:

the base station issues a UE capability Enquiry message to the eMTC user according to the RRC Connection Setup Complete message sent by the eMTC user by using the first uplink authorization message;

after receiving the UE Capability Information ACK fed back by the eMTC user, the base station sends a second uplink authorization message used for the eMTC user to send the UE Capability Information message to the eMTC user;

the base station performs corresponding processing according to the UE Capability Information message transmitted by the eMTC user by using the second uplink authorization message, so that the eMTC user completes initial access;

wherein the UE capability inquiry refers to UE capability inquiry; the UECapability Information refers to UE capability Information.

2. The method as claimed in claim 1, wherein the base station performs corresponding processing according to the UE Capability Information message sent by the eMTC user by using the second uplink grant message, so that the eMTC user completes initial access includes:

the base station issues a Security mode command message to the eMTC user according to the UE Capability Information message sent by the eMTC user by using the second uplink authorization message;

after receiving a Security Mode Command message ACK fed back by the eMTC user, the base station sends a third uplink authorization message for sending a Security Mode Complete message to the eMTC user;

the base station performs corresponding processing according to the Security Mode Complete message sent by the eMTC user by using the third uplink authorization message, so that the eMTC user completes initial access;

wherein the SecurityMode Command refers to a security mode Command; the Security Mode Complete refers to Security Mode completion.

3. The method of claim 2, wherein the base station performs corresponding processing according to a Security Mode Complete message sent by the eMTC user by using the third uplink grant message, and enabling the eMTC user to Complete initial access includes:

the base station transmits an RRC ConnectionReconfiguration message to the eMTC user according to the Security Mode Complete message transmitted by the eMTC user by using the third uplink authorization message;

after receiving the RRC Connection Reconfiguration message ACK fed back by the eMTC user, the base station sends a fourth uplink authorization message for the eMTC user to send an RRC Connection Reconfiguration Complete message;

after receiving the RRC Connection Reconfiguration Complete message sent by the eMTC user by using the fourth uplink authorization message, the base station enables the eMTC user to Complete the initial access;

wherein the RRCConnection Reconfiguration refers to RRC connection Reconfiguration; the RRC Connection Reconfiguration Complete means that RRC Connection Reconfiguration is completed.

4. The method according to claim 3, wherein the first uplink grant message includes information that the transport block size is the length of the RRC Connection Setup Complete message; the second uplink authorization message comprises Information of which the transmission block size is the length of the UE Capability Information message; the third uplink grant message includes information that the size of the transmission block is the length of the Security Mode Complete message; the fourth uplink grant message includes information that a transport block size is the length of the RRC Connection Reconfiguration Complete message.

5. An apparatus for shortening an eMTC user initial access delay, comprising:

a sending module, configured to send, after receiving an RRC Connection Setup message ACK fed back by an eMTC user, a first uplink authorization message for the eMTC user to send an RRC Connection Setup Complete message;

an initial access module, configured to perform corresponding processing according to an RRC Connection Setup Complete message sent by the eMTC user by using the first uplink authorization message, so that the eMTC user completes initial access;

wherein the eMTC refers to enhanced machine type communication; the RRC is a radio resource control; the RRCConnection Setup is RRC connection establishment; the RRCConnection Setup Complete means that RRC connection establishment is completed; the ACK refers to an acknowledgement character;

the initial access module is further configured to issue a UE Capability authorization message to the eMTC user according to the RRCConnection Setup Complete message sent by the eMTC user by using the first uplink authorization message, send a second uplink authorization message used for sending the UE Capability Information message sent by the eMTC user to the eMTC user after receiving a UE Capability authorization message ACK fed back by the eMTC user, and perform corresponding processing according to the UE Capability Information message sent by the eMTC user by using the second uplink authorization message, so that the eMTC user completes initial access;

wherein the UE capability inquiry refers to UE capability inquiry; the UE capability Information refers to UE capability Information.

6. The apparatus of claim 5, wherein the initial access module is further configured to issue a Security Mode Command message to the eMTC user according to a UE Capability Information message sent by the eMTC user via the second uplink grant message, send a third uplink grant message for sending a Security Mode Command message to the eMTC user after receiving a Security Mode Command message ACK fed back by the eMTC user, and perform corresponding processing according to the Security Mode Command message sent by the eMTC user via the third uplink grant message, so that the eMTC user completes initial access;

wherein the SecurityMode Command refers to a security mode Command; the Security Mode Complete refers to Security Mode completion.

7. The apparatus according to claim 6, wherein the initial access module is further configured to, according to a Security Mode Complete message sent by the eMTC user using the third uplink grant message, send an RRC Connection Reconfiguration message to the eMTC user, send a fourth uplink grant message used for sending an RRC Connection Reconfiguration Complete message to the eMTC user after receiving an rrcconnectionreconfiguration message ACK fed back by the eMTC user, and after receiving an RRC Connection Reconfiguration Complete message sent by the eMTC user using the fourth uplink grant message, enable the eMTC user to Complete initial access;

wherein the RRCConnection Reconfiguration refers to RRC connection Reconfiguration; the RRC Connection Reconfiguration Complete means that RRC Connection Reconfiguration is completed.

8. The apparatus according to claim 7, wherein the first uplink grant message includes information that a transport block size is a length of a RRC Connection Setup Complete message; the second uplink authorization message comprises Information of which the transmission block size is the length of the UE Capability Information message; the third uplink grant message includes information that the size of the transmission block is the length of the Security Mode Complete message; the fourth uplink grant message includes information that a transport block size is an RRC Connection Reconfiguration Complete message length.

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