WO2012159367A1

WO2012159367A1 - Method, user equipment and base station for establishing wireless resource control protocol connection

Info

Publication number: WO2012159367A1
Application number: PCT/CN2011/077997
Authority: WO
Inventors: 黄波
Original assignee: 华为技术有限公司
Priority date: 2011-08-04
Filing date: 2011-08-04
Publication date: 2012-11-29
Also published as: CN103039119A; CN103039119B

Abstract

Disclosed are a method, user equipment and base station for establishing a wireless resource control protocol connection. The method comprises: an eNB receiving an RRC connection request message sent by UE; the eNB sending an RRC connection setup message to the UE, the RRC connection setup message comprising the maximum number of HARQ retransmissions and the maximum number of SRI transmissions, the maximum number of HARQ retransmissions being fewer than the maximum number of SRI transmissions. The technical solution provided in the present invention solves the problem in the prior art that the DCIO causes the user to be mistakenly released since the UE solves the DCI0 virtually, and ensures normal transmission of user data.

Description

Radio resource control protocol connection establishment method, user terminal and base station

The embodiments of the present invention relate to a wireless communication technology, and in particular, to a radio resource control protocol (Radio Resource Control; RRC) connection establishment method, a user terminal, and a base station. Background technique

For the application of communication protocols, ensuring the user experience is the most important. For the defect that the quality of the air interface is unstable, most of the existing communication protocols ensure that the data packet is correctly transmitted through retransmission and the like to improve the user experience. Long Term Evolution (LTE) is the mainstream technology of the next generation wireless communication system. In the LTE system, the Uu interface is an evolved Node B (abbreviated as: eNB) and a user terminal (User Equipment; The cartridge is called: UE).

The scheduling time of the LTE system is 1 millisecond (ms), and the result that the user can perceive is generally more than 100ms, that is, for a certain data packet or application point, as long as the processing is complete within the time that the user can perceive It can be accepted by the user. However, if the user is released in a normal business application, the user will be unable to transmit data at all, so this situation is not acceptable.

After the UE sends a resource scheduling request indication (SRI) to the eNB, the eNB sends an uplink resource grant (Uplink Scheduling Grant) to the UE to authorize the format of the UE (the format is (SRI). The downlink control information (Downlink Control Information; DCI) of the format 0), that is, DCI0, resolves to the DCI0 corresponding to the uplink resource grant for the UE. Due to the defects of various communication products, UE will inevitably have a virtual solution to DCI0. The situation in which the UE virtualizes the DCI0 means that after the UE sends the SRI to the eNB, before the eNB actually authorizes the DCI0, the DCI0 that is not authorized by the eNB is parsed, that is, the DCI0 that the UE virtualizes is not the true authorization of the eNB. DCI0. When the virtualized DCI0 is different from the DCI0 that is subsequently authorized by the eNB, the UE will continue to resend the SRI to re-request the uplink resource when the DCI0 authorized by the eNB is in error, and when the number of resending the SRI reaches the maximum number of SRI transmissions, the user will Be Release, that is, the user is released before applying for uplink resources. It can be seen that the UE in the prior art virtualizes the DCI0 may cause the user to be abnormally released. Summary of the invention

The invention provides a method for establishing a RRC connection, a user terminal and a base station, which are used to solve the problem that the user is abnormally released due to the virtual solution of the DCI0 by the UE in the prior art, and the normal transmission of the user data is ensured.

An aspect of the present invention provides a radio resource control protocol RRC connection establishment method, including: an evolved base station eNB receiving an RRC connection request message sent by a user terminal UE;

The eNB sends an RRC connection setup message to the UE, where the RRC connection setup message includes a hybrid automatic repeat request (HARQ) maximum number of retransmissions and a resource scheduling request indication SRI maximum number of transmissions, and the HARQ maximum retransmission times is less than The maximum number of transmissions of the SRI.

Another aspect of the present invention provides a base station, including:

a first receiver, configured to receive a radio resource control protocol RRC connection request message sent by the user terminal UE;

a first transmitter, configured to send an RRC connection setup message to the UE, where the RRC connection setup message includes a hybrid automatic repeat request (HARQ maximum retransmission times) and a resource scheduling request indication SRI maximum transmission times, and the HARQ maximum weight The number of transmissions is less than the maximum number of transmissions of the SRI.

Another aspect of the present invention provides a radio resource control protocol RRC connection establishment method, which includes:

The user terminal UE sends an RRC connection request message to the evolved base station eNB;

The UE receives an RRC connection setup message sent by the eNB, where the RRC connection setup message includes a hybrid automatic repeat request (HARQ maximum retransmission number) and a resource scheduling request indication SRI maximum transmission number, and the HARQ maximum retransmission number is less than The maximum number of transmissions of the SRI.

A further aspect of the present invention provides a user terminal, including:

a second transmitter, configured to send a radio resource control protocol C connection request to the evolved base station eNB Message

a second receiver, configured to receive an RRC connection setup message sent by the eNB, where the RRC connection setup message includes a hybrid automatic repeat request (HARQ) maximum number of retransmissions and a resource scheduling request indication SRI maximum number of transmissions, and the HARQ is maximum The number of retransmissions is less than the maximum number of transmissions of the SRI.

In the foregoing technical solution, after receiving the RRC connection request message sent by the UE, the base station

The UE sends an RRC connection setup message, and carries the maximum number of HARQ retransmissions and the maximum number of SRI transmissions in the RRC connection setup message, and limits the maximum number of retransmissions of the HARQ to be less than the maximum number of transmissions of the SRI. The problem of abnormal release ensures the normal transmission of user data. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a flowchart of a method for establishing an RRC connection according to an embodiment of the present invention;

FIG. 1B is a flowchart of a method for establishing an RRC connection according to another embodiment of the present invention;

FIG. 1 is a flowchart of a method for a UE to apply for an uplink resource for data transmission according to an embodiment of the present invention;

2 is a flowchart of a method for establishing an RRC connection according to another embodiment of the present invention;

3 is a schematic diagram of a structure of a base station and a connection manner between the base station and a user terminal according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a structure of a UE and a connection manner between a UE and a base station according to an embodiment of the present invention. detailed description The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of a method for establishing an RRC connection according to an embodiment of the present invention. As shown in FIG. 1A, the method in this embodiment includes:

Step 101: The eNB receives an RRC Connection Request message (RRC Connection Request) sent by the UE.

When the wireless service needs to be carried out, the upper layer of the UE will request to establish a signaling connection when the UE is idle.

In the (idid) mode, the UE initiates the process of establishing an RRC connection. Specifically, the UE sends an RRC connection request message to the eNB through a Common Control Channel (CCCH).

Step 102: The eNB sends an RRC Connection Setup message to the UE, where the RRC connection setup message includes a hybrid automatic repeat request (Hybrid Automatic Repeat Request; the cartridge is called: HARQ), the maximum number of retransmissions, and the maximum number of SRI transmissions. And the maximum number of HARQ retransmissions is less than the maximum number of SRI transmissions.

After receiving the RRC connection request message sent by the UE, the eNB first determines whether an RRC connection can be established according to the current radio resource condition. If not, the eNB returns an RRC Connection Reject message to the UE. If so, the eNB allocates the corresponding resource and returns an RRC Connection Setup message to the UE.

The eNB may carry various configuration parameters in the RRC connection setup message, so that the UE completes the establishment of the RRC connection according to the configurations. In this embodiment, the eNB carries the maximum number of HARQ retransmissions and the maximum number of SRI transmissions in the RRC connection setup message, so as to set the maximum number of retransmissions when the UE retransmits the data packet and the maximum number of consecutive SRI transmissions. At the same time, the maximum number of HARQ retransmissions and the maximum number of SRI transmissions set by the eNB are satisfied: the maximum number of retransmissions of the HARQ is less than the maximum number of transmissions of the SRI. In the RRC connection establishment method of the embodiment, after receiving the RRC connection request message sent by the UE, the eNB sends an RRC connection setup message to the UE, and carries the maximum number of HARQ retransmissions and the maximum number of SRI transmissions in the RRC connection setup message, and The maximum number of retransmissions of the limited HARQ is less than the maximum number of transmissions of the SRI, so that in the scenario where the UE deciphers the DCI0 that the eNB does not authorize, the UE refuses to transmit data because the DCI0 that is virtualized is different from the DCI0 that the eNB actually authorizes. The eNB resolves the error to the eNB because the number of retransmissions of the DCI is less than the maximum number of transmissions of the SRI, so that the RRC connection of the user remains the same when the number of times the eNB retransmits the DCI0 reaches the maximum number of HARQ retransmissions. Keeping, the eNB has the opportunity to perform radio link control (RLC) retransmission. At this time, the eNB will resend a new DCI0 and enable the UE to transmit data based on the new DCI0. The problem that the UE virtualizes the DCI0 may cause the user to be abnormally released, and the normal transmission of the user data is guaranteed.

FIG. 1B is a flowchart of a method for establishing an RRC connection according to another embodiment of the present invention. As shown in FIG. 1B, the method in this embodiment includes:

Step 110: The UE sends an RRC connection request message to the eNB.

When the UE needs to perform wireless services, the upper layer of the UE may request to establish a signaling connection.

Step 120: The UE receives an RRC connection setup message sent by the eNB, where the RRC connection setup message includes a maximum number of HARQ retransmissions and a maximum number of SRI transmissions, and the maximum number of HARQ retransmissions is less than the maximum number of SRI transmissions.

After receiving the RRC connection setup message, the UE performs parameter configuration according to the information carried in the RRC connection setup message to perform RRC connection establishment.

This embodiment describes the process of establishing an RRC connection from the perspective of the UE. For a detailed description of the RRC connection establishment process, reference may be made to the embodiment shown in FIG. 1A.

In the RRC connection establishment method of the present embodiment, after the UE sends an RRC connection request message to the eNB, the RRC connection setup message sent by the eNB is performed, and the eNB carries the maximum number of HARQ retransmissions and the maximum number of SRI transmissions in the RRC connection setup message, and is limited. The maximum number of retransmissions of the HARQ is smaller than the maximum number of transmissions of the SRI. In this scenario, the UE decrypts the DCI0 that the eNB does not authorize. The DCI0 that is virtualized is different from the DCI0 that the eNB actually grants, and the eNB refuses to transmit data, so that the eNB resolves the error due to the failure to receive the data, and then continuously retransmits the DCI0, but the maximum number of retransmissions of the HARQ is less than the maximum number of transmissions of the SRI. The RRC connection of the user is still maintained when the number of retransmissions of the DCI0 of the eNB reaches the maximum number of retransmissions of the HARQ, so that the eNB has the opportunity to perform radio link control (RLC) retransmission, and the eNB then A new DCI0 is resent, and the UE performs data transmission based on the new DCI0, which solves the problem that the UE virtualizes the DCI0, which may cause the user to be abnormally released, and ensures normal transmission of user data.

FIG. 1C is a flowchart of a method for a UE to apply for an uplink resource for data transmission according to an embodiment of the present invention. As shown in FIG. 1C, the method in this embodiment includes:

Step 10a: The UE sends an SRI to the eNB, so as to acquire an uplink resource allocated by the eNB.

When the UE needs to send the uplink data, and there is no uplink scheduling resource in the Transmission Time Interval (TTI), the SRI is sent to the eNB to acquire the uplink resource allocated by the eNB.

Specifically, before transmitting the SRI, the UE first determines whether there is a Physical Uplink Control Channel (PUCCH) resource available in the current TTI. If there is no PUCCH resource available in the current TTI, the UE initiates a random access procedure. If there is a PUCCH resource available in the current TTI, the UE determines whether the number of SRI transmissions is less than the SRI maximum transmission number. If the judgment result is less than, the UE adds 1 to the number of SRI transmissions and sends an SRI on the available PUCCH, that is, sends a Scheduling Request Indicator message. If the result of the judgment is not less than, it indicates that the number of SRI transmissions has reached the maximum number of transmissions of the SRI. At this time, the UE initiates user release ( Release), that is, releases the PUCCH or SRS resources in the RRC connection and the RRC connection, and re-initiates the random connection. Into the process.

Step 10b: The UE virtualizes a DCI0 before the eNB authorizes the DCI0, and receives the DCI0 authorized by the eNB after the DCI0 is decrypted.

Generally, after receiving the SRI of the UE, the eNB sends an uplink resource grant to authorize the UE.

DCI0. The UE will resolve to DCI0 and will transmit data according to the resolved DCI0. However, the UE in the prior art may solve the DCI 0 that the eNB does not actually authorize after sending the SRI to the eNB and before the eNB actually authorizes the DCI0. In this embodiment, it is assumed that the UE first virtualizes a DCI0, and then receives the DCI0 that the eNB actually authorizes.

Step 10c: When the UE determines that the new data indicator (NDI) in the two DCI0s does not reverse, the UE retransmits the data by using the uplink grant resource indicated by the DCI0 authorized by the eNB.

In this embodiment, it is assumed that the UE first virtualizes a DCI0 at a certain moment, and then receives a DCI0 that is actually authorized by the eNB to indicate the UE's new transmission. The eNB indicates whether the UE wants to retransmit data or newly transmit data by using a change in the NDI in the DCI0 that is authorized twice. If the NDI in the previously authorized DCI0 does not roll over, it indicates that the UE is required to retransmit the data. If the NDI in the DCI0 authorized twice before is reversed, it indicates that the UE needs to transmit data.

If the DCI in the DCI and the DCI in the DCI that the eNB authorizes are not changed, the UE will misidentify the DCI0 of the eNB to indicate the newly transmitted data of the UE as the DCI0 of the retransmitted data, and will be indicated by the DCI0 authorized by the eNB. The upstream grant resource retransmits the data.

Step 10d: When the UE retransmits the data, the transport block size in the DCI0 authorized by the eNB is found.

(Transmission Block Size; for short: TBS), when it is different from the TBS in the virtualized DCI0, refuses to transmit data, and retransmits the SRI to request the eNB to re-authorize DCI0 until the number of times the SRI is transmitted reaches the maximum number of transmissions. Release the user.

The UE may find that the TBS in the DCI0 authorized by the eNB is different from the TBS in the imaginary DCI0, and the UE considers that the DCI0 sent by the eNB is the wrong DCI0 and refuses to transmit data. The SRI is again sent to the eNB to request the eNB to re-authorize the correct DCI0. If the UE fails to successfully transmit data according to the DCI0 authorized by the eNB before the SRI reaches the maximum number of transmissions, the UE will resend the SRI continuously until the SRI reaches the maximum number of transmissions and releases the user.

Step 10e: The eNB parses an error in the TTI corresponding to the authorized DCI0, and re-authorizes the indication.

The UE newly transmits the DCI0 of the data until the re-authorization indicates that the DCI0 of the newly transmitted data of the UE reaches the HARQ. The maximum number of retransmissions is performed by RLC retransmission to resend a DCI0 indicating the newly transmitted data of the UE. For the eNB, because the UE refuses to transmit data, the eNB will resolve the error within the TTI corresponding to the authorized DCI0, and re-authorize the DCI0 indicating the newly transmitted data of the UE until the set number of HARQ maximum retransmissions is reached. The maximum number of HARQ retransmissions on the eNB side is the same as the maximum number of HARQ retransmissions sent to the UE through the RRC connection setup message, and the maximum number of retransmissions of the data packet is limited. When the eNB retransmits the number of DCI0s indicating that the UE newly transmits data reaches the maximum number of HARQ retransmissions, the eNB performs LC retransmission, and the eNB re-authorizes a DCI0 indicating the newly transmitted data of the UE.

In step 10f, the UE resolves to the DCI0 re-authorized by the eNB before the SRI reaches the maximum number of transmissions, and detects that the DCI0 re-authorized by the eNB and the NDI in the previously authorized DCI0 of the eNB are reversed, and then the data is transmitted according to the DCI0 re-authorized by the eNB.

In the above process, since the UE considers that the DCI0 authorized by the eNB is erroneous, the SRI is retransmitted to the eNB. If the maximum number of retransmissions of the HARQ is greater than the maximum number of transmissions of the SRI, the number of retransmissions of the SRI by the UE reaches the maximum number of transmissions of the SRI and the user is released (ie, the RRC connection is disconnected), so that the RRC does not retransmit the RLC. The user is completely unable to transfer data. If the user still needs to continue to transmit data, the RRC connection can only be re-established, which will greatly reduce the data transmission rate.

In the embodiment of the present invention, the eNB sends the maximum number of HARQ transmissions and the maximum number of transmissions of the SRI to the UE through the Uu interface with the UE, and limits the maximum number of retransmissions of the HARQ to be less than the maximum number of transmissions of the SRI, so that the SRI is resent in the UE. Before the number of SRIs reaches the maximum number of transmissions, the eNB performs RLC retransmission because the number of HARQ retransmissions reaches the maximum number of HARQ retransmissions. This allows the UE to obtain the DCI0 re-authorized by the eNB and correctly send data. DCI0 causes the user to be released abnormally, ensuring the correct transmission of user data.

In addition, in the prior art, there is a technical solution for delaying the transmission of the SRI to reduce the chance of transmitting the SRI to avoid the user being released due to the number of retransmissions of the SRI reaching the maximum number of SRI transmissions. However, the period in which the SRI is sent is considered from a performance perspective and cannot be configured too large. If the period of sending the SRI is too large, when the UE has uplink data to be sent, there is no timely SRI to apply for DCI0, thereby reducing the transmission rate of the above data, and the UE's customer experience is deteriorated. The present invention The method for limiting the maximum number of retransmissions of the HARQ is less than the maximum number of transmissions of the SRI in the RRC parameters configured for the UE, and does not need to limit the period for sending the SRI, and can configure the SRI period according to the service performance configuration to ensure the UE's client. Experience. In addition, the method in the embodiment of the present invention does not need to change the existing RRC connection establishment process, and is simple and easy to implement.

Further, the Time Division Duplexing (TDD) mode of the LTE system supports different uplink and downlink time ratios, and the uplink and downlink ratio modes are as shown in Table 1, where "U" indicates an uplink subframe, " D" represents a downlink subframe, and "S" represents a special subframe. The ratio 0 mode refers to 6 uplink subframes in 10 subframes when the period is 5 ms; the ratio 1 mode refers to 4 uplink subframes in 10 subframes when the period is 5 ms; the ratio 2 mode refers to There are 2 uplink subframes in 10 subframes when the period is 5 ms. The ratio 3 mode refers to 3 uplink subframes in 10 subframes when the period is 10 ms. The ratio 4 mode refers to 10 in the period of 10 ms. There are 2 uplink subframes in the subframes; the ratio 5 mode refers to 1 uplink subframe in 10 subframes when the period is 10 ms; the ratio 6 mode refers to 5 out of 10 subframes when the period is 5 ms. Uplink subframe. In the actual application, the uplink and downlink ratio mode of the TDD supported by each cell is pre-configured in the planning of each cell, and the uplink and downlink proportioning mode of the TDD is included in the system message broadcasted by each cell. The eNB periodically broadcasts the uplink and downlink ratio modes of the TDDs supported by the respective cells in the coverage of the coverage, so that the UE can determine the uplink and downlink ratio mode of the TDD used after accessing the network.

The embodiments of the present invention are applicable to various uplink and downlink ratio modes in the TDD mode of the LTE system. It can be seen from the above that the uplink and downlink ratio mode of the TDD is determined by the cell in which the UE camps, that is, when the cell is camped in the cell, the matching mode used in the system message of the cell has been determined. . When the ratio mode determined in the system message is ratio 5, since there is only one uplink subframe in the ratio 5 mode, if the period of sending the SRI is 10 ms, the UE has only one chance to send the SRI request uplink resource. Therefore, compared with other ratio modes, the ratio 5 mode is more prone to the problem that the user is abnormally released. Therefore, when the embodiment of the present invention is applied to the ratio 5 mode, the protection of the normal transmission user data is particularly obvious.

Table 1

FIG. 2 is a flowchart of a method for establishing an RRC connection according to another embodiment of the present invention. As shown in FIG. 2, the method in this embodiment includes:

Step 201: The eNB receives an RRC connection request message sent by the UE.

For the description of this step, refer to the description of step 101, and details are not described herein.

Step 202: The eNB sends an RRC connection setup message to the UE, where the RRC connection setup message includes the maximum number of HARQ retransmissions and the maximum number of SRI transmissions, and the maximum number of HARQ retransmissions is less than the maximum number of SRI transmissions.

Step 203: The UE receives an RRC connection setup message, and performs parameter configuration according to the RRC connection setup message.

When the downlink ratio mode supported by the cell in which the UE initiates the RRC connection establishment (that is, the cell in which the UE camps) is the ratio 5, the maximum number of HARQ retransmissions and the maximum SRI transmission of the UE are respectively configured according to the RRC connection setup message. The number of times, and the maximum number of retransmissions of the HARQ is less than the maximum number of transmissions of the SRI, which can greatly reduce the probability of the UE being abnormally released, ensure the normal transmission of user data, and improve the UE's customer experience.

Step 204: The UE sends an RRC Connection Setup Complete message to the eNB.

After the UE performs parameter configuration according to the RRC connection setup message, the RRC connection is sent to the eNB. The eNB completes the RRC connection setup complete message sent by the UE after performing parameter configuration according to the RRC connection setup message. So far, an RRC connection is established between the UE and the eNB. When the UE has data to send, the SRI may be sent to the eNB to apply for an uplink resource, and the data is sent when the uplink resource is acquired. For a process in which the UE sends an SRI to the eNB to apply for an uplink resource, and the data is sent when the uplink resource is obtained, the description of the embodiment shown in FIG. 1C is omitted.

In the RRC connection establishment method of the embodiment, the eNB configures the maximum number of retransmissions of the HARQ and the maximum number of transmissions of the SRI by the RRC connection setup message, and limits the maximum number of retransmissions of the HARQ to be less than the maximum number of transmissions of the SRI, so that the eNB decrypts the eNB and In the scenario of the unlicensed DCI0, the UE refuses to transmit data because the virtualized DCI0 is different from the DCI0 that the eNB actually grants, so that the eNB resolves the error due to the failure to receive the data and continuously retransmits the DCI0, but due to the HARQ. The maximum number of retransmissions is less than the maximum number of transmissions of the SRI, so that the RRC connection of the user remains when the number of times the eNB retransmits DCI0 reaches the maximum number of HARQ retransmissions, so that the eNB has the opportunity to perform RLC retransmission, and the eNB resends one. The new DCIO, and the UE transmits data based on the new DCIO, solves the problem that the UE virtualizes the DCI0, which may cause the user to be abnormally released, and ensures the normal transmission of the user data. Especially in the ratio 5, the method of the embodiment can greatly reduce the probability of the user being abnormally released, more in line with the business requirement, and more significantly improve the UE's customer experience.

FIG. 3 is a schematic diagram of a structure of a base station and a connection manner between the base station and a user terminal (such as UE30) according to an embodiment of the present invention. The base station in this embodiment may be an eNB in an LTE system. As shown in FIG. 3, the base station of this embodiment includes: a first receiver 31 and a first transmitter 32.

The first receiver 31 is connected to the UE 30 and configured to receive an RRC connection request message sent by the UE 30. The first transmitter 32 is connected to the first receiver 31 and the UE 30, and configured to send an RRC connection setup message to the UE 30 according to the RRC connection request message received by the first receiver 31, where the RRC connection setup message includes the maximum HARQ. The number of transmissions and the maximum number of transmissions of the SRI, and the maximum number of HARQ retransmissions is less than the maximum number of transmissions of the SRI.

The foregoing function module of the base station in this embodiment may be used to perform the process of the RRC connection establishment method shown in FIG. 1A. The specific working principle is not described here. For details, refer to the description of the method embodiment. Further, the first receiver 31 of the embodiment is further configured to receive an RRC connection setup complete message returned by the UE 30 after performing parameter configuration according to the RRC connection setup message.

The first transmitter 32 is further configured to send the uplink and downlink proportioning mode information of the TDD to the cell in which the UE 30 is camped, that is, the cell in which the UE 30 initiates the RRC connection establishment, before the UE 30 sends the RRC connection request message to the eNB. More specifically, the first transmitter 32 can periodically send the uplink and downlink ratio mode information of the TDD. When the uplink and downlink ratio mode of the TDD is the ratio of 5, the base station in this embodiment can greatly reduce the probability of the user being abnormally released by limiting the TDD of the maximum number of HARQ retransmissions to be less than the maximum number of transmissions of the SRI. Business needs are conducive to improving the customer experience of the UE.

The foregoing various functional modules may be used to perform the corresponding processes in the RRC connection establishment method shown in FIG. 2, and the specific working principles are not described herein again. For details, refer to the description of the method embodiments.

After receiving the RRC connection request message sent by the UE, the base station of the embodiment sends an RRC connection setup message to the UE, and carries the maximum number of HARQ retransmissions and the maximum number of SRI transmissions in the RRC connection setup message, and limits the maximum number of HARQs. The number of transmissions is less than the maximum number of transmissions of the SRI, so that in the scenario where the UE virtualizes the DCI0 that the eNB does not authorize, the UE refuses to transmit data because the virtualized DCI0 is different from the DCI0 that the eNB actually authorizes, so that the eNB receives the data. If the number of retransmissions of the HARQ is less than the maximum number of transmissions of the SRI, the RRC connection of the user is still maintained when the number of retransmissions of the DCI0 reaches the maximum number of HARQ retransmissions. The eNB has the opportunity to perform the RLC retransmission. At this time, the eNB resends a new DCI0 and causes the UE to perform data transmission based on the new DCI0, which solves the problem that the maximum retransmission is reached in the HARQ when the UE virtualizes the DCI0. Before the number of times, the SRI first reaches the maximum number of transmissions and the user is abnormally released, which ensures the normal transmission of user data. In particular, when the TDD uplink-downlink ratio mode used is ratio 5, the probability of users being abnormally released can be greatly reduced, which is more in line with business requirements and can improve the UE customer experience.

FIG. 4 is a schematic diagram of a structure of a UE and a connection manner between the UE and a base station (such as an eNB 40) according to an embodiment of the present invention. As shown in FIG. 4, the UE in this embodiment includes: a second transmitter 41 and a second receiver 42. The second transmitter 41 is connected to the eNB 40 and configured to send an RRC connection request message to the eNB 40. The second receiver 42 is connected to the eNB 40 and configured to receive an RRC connection setup message sent by the eNB 40, where the RRC connection setup message includes a maximum number of HARQ retransmissions and a maximum number of SRI transmissions, and the maximum number of HARQ retransmissions is less than the maximum number of SRI transmissions. .

The foregoing function module of the base station in this embodiment may be used to perform the process of the RRC connection establishment method shown in FIG. 1B, and the specific working principle is not described here. For details, refer to the description of the method embodiment.

Further, the second transmitter 41 is further configured to perform parameter configuration according to the RRC connection setup message, and send an RRC connection setup complete message to the eNB40.

The UE in this embodiment receives the RRC connection setup message sent by the eNB through the second receiver by using the RRC connection request message sent by the second transmitter to the eNB, and the eNB carries the maximum number of HARQ retransmissions and the SRI maximum in the RRC connection setup message. The number of transmissions is limited, and the maximum number of retransmissions of the HARQ is less than the maximum number of transmissions of the SRI. Therefore, in the scenario where the UE deciphers the DCI0 that the eNB does not authorize, the UE will reject the DCI0 that is virtualized by the UE and the DCI0 that the eNB actually authorizes. The data is transmitted, so that the eNB parses the error due to the failure to receive the data, and then continuously retransmits the DCI0. However, since the maximum number of retransmissions of the HARQ is less than the maximum number of transmissions of the SRI, the number of times the eNB retransmits the DCI0 reaches the maximum number of HARQ retransmissions. The RRC connection is still maintained, so that the eNB has the opportunity to perform RLC retransmission. At this time, the eNB resends a new DCI0, and causes the UE to perform data transmission based on the new DCI0, which solves the problem that the UE virtualizes DCI0. The problem that the user is abnormally placed due to the SRI reaching the maximum number of transmissions before the HARQ reaches the maximum number of retransmissions. Permit normal transmission of user data. In particular, when the TDD uplink-downlink ratio mode used is ratio 5, the probability of the user being abnormally released can be greatly reduced, which is more in line with the service requirements, and can further improve the UE customer experience.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. Including the steps of the above method embodiments; and the foregoing storage The media includes: ROM, RAM, disk or optical disk and other media that can store program code. It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A radio resource control protocol RRC connection establishment method, comprising: an evolved base station eNB receiving an RRC connection request message sent by a user terminal UE;

The RRC connection establishment method according to claim 1, further comprising: the eNB receiving an RRC connection setup complete message sent by the UE after performing parameter configuration according to the received RRC connection setup message. .

The method for establishing an RRC connection according to claim 1 or 2, wherein the receiving the base station eNB before receiving the RRC connection request message sent by the user terminal UE includes:

The eNB sends a time-division duplex TDD uplink-downlink ratio mode letter to the cell in which the UE resides

The RRC connection establishment method according to claim 3, wherein the uplink and downlink ratio mode of the TDD is a ratio 5.

5. A base station, comprising:

The base station according to claim 5, further comprising: the first receiver is further configured to receive an RRC connection setup complete message that is returned by the UE after performing parameter configuration according to the RRC connection setup message. .

The base station according to claim 5 or 6, wherein the first transmitter is further configured to send the uplink and downlink ratio mode information of the time division duplex TDD to the cell where the UE camps.

The base station according to claim 7, wherein the uplink and downlink ratio mode of the TDD is a ratio 5.

A radio resource control protocol RRC connection establishment method, comprising: a user terminal UE transmitting an RRC connection request message to an evolved base station eNB;

The method for establishing an RRC connection according to claim 9, further comprising: performing, by the UE, parameter configuration according to the RRC connection setup message;

The UE sends an RRC Connection Setup Complete message to the eNB.

11. A user terminal, comprising:

a second transmitter, configured to send a radio resource control protocol RRC connection request message to the evolved base station eNB;

The user terminal according to claim 11, wherein the second transmitter is further configured to perform parameter configuration according to the RRC connection setup message, and send an RRC connection setup complete message to the eNB.