CN112672390B - RRC (radio resource control) connection reconfiguration message transmission method, device and communication equipment - Google Patents
RRC (radio resource control) connection reconfiguration message transmission method, device and communication equipment Download PDFInfo
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Abstract
The application relates to a method, a device and communication equipment for transmitting RRC connection reconfiguration information. The method comprises the following steps: when receiving a base station switching instruction, transmitting the RRC connection reconfiguration message to the user terminal; acquiring HARQ information fed back to the MAC layer by the user terminal through the RLC layer; and if the HARQ message is NACK, controlling the RLC layer to retransmit the RRC connection reconfiguration message. The method can reduce the retransmission times of the RRC connection reconfiguration message of the RLC layer, reduce the interference of the retransmission to other user terminals and improve the switching reliability of the base station.
Description
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to an RRC connection reconfiguration message transmission, an apparatus, a communication device, and a storage medium.
Background
The rapid development of high-speed railway construction provides convenience for people to travel, and then a wireless communication network aiming at a high-speed train operation scene appears, wherein the network is generally linearly distributed along a railway, when a train enters and exits, a base station is required to be switched, and a source base station transmits an RRC (Radio Resource Control ) connection reconfiguration message to UE (User Equipment) in the switching process so as to enable the UE to reestablish RRC connection.
When the RRC connection reconfiguration message is not transmitted correctly, retransmission is required, and currently, a two-stage retransmission processing mechanism is adopted, including a HARQ (Hybrid Automatic Repeat reQuest ) mechanism of a MAC (Media Access Control, media intervention control) layer and an ARQ (Automatic Repeat reQuest) mechanism of an RLC (Radio Link Control ) layer in an AM (Acknowledged Mode) mode, and when the UE receives the RRC connection reconfiguration message issued by the source base station, if the data is decoded, harq_ack is fed back to the MAC layer of the source base station, and meanwhile rlc_ack is fed back to the RLC layer.
However, when the base station is switched, the signal strength of the UE sent to the source base station is weaker, which easily causes that the source base station cannot receive the rlc_ack message, or the UE is in a switching state and does not send the rlc_ack message, so that the source base station retransmits the RRC connection reconfiguration message for multiple times in the RLC layer, when a plurality of high-speed trains enter and exit simultaneously, the number of UEs needing to switch the base station is larger, and the UEs are usually switched with the same frequency and the small bandwidth, and the multiple retransmissions interfere with the base station switching of other UEs, thereby increasing the switching failure probability and switching delay and reducing the switching reliability.
Therefore, the conventional RRC connection reconfiguration message transmission technology has the problem that other UE handover is easily interfered, and the handover reliability of the base station of the wireless communication network is reduced.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an RRC connection reconfiguration message transmission method, apparatus, communication device, and storage medium capable of improving base station handover reliability.
A method of RRC connection reconfiguration message transmission, the method comprising:
when receiving a base station switching instruction, transmitting the RRC connection reconfiguration message to the user terminal;
acquiring HARQ information fed back to the MAC layer by the user terminal through the RLC layer;
and if the HARQ message is NACK, controlling the RLC layer to retransmit the RRC connection reconfiguration message.
In one embodiment, the RLC layer is configured with a retransmission identity, and the method further includes:
if the HARQ information is NACK, updating the retransmission identification according to a preset rule, and returning to the step of acquiring the HARQ information fed back to the MAC layer by the user terminal through the RLC layer;
and if the HARQ message is ACK, setting the retransmission identifier as a retransmission initial value.
In one embodiment, the issuing the RRC connection reconfiguration message to the user terminal includes:
the RRC connection reconfiguration message is fragmented, so that the RRC connection reconfiguration message after the fragmentation is obtained;
and transmitting the RRC connection reconfiguration message after the slicing to the user terminal.
In one embodiment, if the HARQ message is an ACK, the setting the retransmission flag to a retransmission initial value includes:
and if the HARQ messages fed back by the user terminal are ACK after each RRC connection reconfiguration message after the segmentation is issued, setting the retransmission identifier as the retransmission initial value.
In one embodiment, if the HARQ message is NACK, updating the retransmission identifier according to a preset rule includes:
if the HARQ message is NACK, a retransmission identifier after updating is obtained by adding a preset step length to the retransmission identifier; the preset step length comprises 1;
and if the updated retransmission identification exceeds the preset maximum retransmission times, controlling the RLC layer to retransmit all the segmented RRC connection reconfiguration messages.
In one embodiment, the method further comprises:
acquiring a measurement report reported by the user terminal;
determining whether to send a base station switching request to a target base station according to the measurement report;
if yes, receiving a switching response message fed back by the target base station;
and if the switching response message is the base station switching instruction, the RRC connection reconfiguration message is issued to the user terminal so that the user terminal can access the target base station.
In one embodiment, the method further comprises:
receiving an RRC connection reconfiguration completion message fed back by the user terminal; the RRC connection reconfiguration complete message is a message fed back when the user terminal accesses the target base station.
An RRC connection reconfiguration message transmitting apparatus, the apparatus comprising:
the sending module is used for sending the RRC connection reconfiguration message to the user terminal when receiving a base station switching instruction;
a receiving module, configured to obtain, by using an RLC layer, an HARQ message fed back to an MAC layer by the user terminal;
and the retransmission module is used for controlling the RLC layer to retransmit the RRC connection reconfiguration message if the HARQ message is NACK.
A communication device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
when receiving a base station switching instruction, transmitting the RRC connection reconfiguration message to the user terminal;
acquiring HARQ information fed back to the MAC layer by the user terminal through the RLC layer;
and if the HARQ message is NACK, controlling the RLC layer to retransmit the RRC connection reconfiguration message.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
when receiving a base station switching instruction, transmitting the RRC connection reconfiguration message to the user terminal;
acquiring HARQ information fed back to the MAC layer by the user terminal through the RLC layer;
and if the HARQ message is NACK, controlling the RLC layer to retransmit the RRC connection reconfiguration message.
According to the RRC connection reconfiguration message transmission method, the device, the communication equipment and the storage medium, when the base station switching instruction is received, the RRC connection reconfiguration message is issued to the user terminal, the RRC connection reconfiguration message can be sent to the user terminal when the target base station allows the base station to switch, the HARQ message fed back to the MAC layer by the user terminal is acquired through the RLC layer, if the HARQ message is NACK, the RLC layer is controlled to retransmit the RRC connection reconfiguration message, and because the MAC layer can also receive the ACK message when the signal intensity of the UE sent to the source base station is weaker, the RLC layer adopts the HARQ message of the MAC layer, retransmission can be carried out only when the HARQ message is NACK, the retransmission times of the RRC connection reconfiguration message of the RLC layer are reduced, the interference of retransmission to other user terminals is reduced, and the base station switching reliability is improved.
Drawings
Fig. 1 is an application environment diagram of an RRC connection reconfiguration message transmission method in one embodiment;
fig. 2 is a flow chart illustrating a method of RRC connection reconfiguration message transmission in one embodiment;
fig. 3 is a flowchart of another embodiment of a method for transmitting an RRC connection reconfiguration message;
FIG. 4 is a timing diagram of a method of base station handoff in one embodiment;
fig. 5 is a block diagram illustrating an architecture of an RRC connection reconfiguration message transmission apparatus in one embodiment;
fig. 6 is an internal structural diagram of a communication device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The transmission method of the RRC connection reconfiguration message provided by the application can be applied to an application environment shown in figure 1. Wherein the user terminal 102 communicates with the base station 104 via a high speed railway wireless communication network. The user terminal 102 may be, but not limited to, various personal computers, notebook computers, smartphones, tablet computers, and portable wearable devices, the base station 104 may be, but not limited to, various macro base stations, micro base stations, pico base stations, and distributed base stations, and further, the base station 104 may be a 5G base station, and may also be deployed along a high-speed railway.
In one embodiment, as shown in fig. 2, there is provided a method for transmitting an RRC connection reconfiguration message, which is described by taking an example that the method is applied to the base station in fig. 1, and includes the following steps:
step S210, when receiving the base station switching instruction, the RRC connection reconfiguration message is issued to the user terminal.
The base station switching instruction may be an instruction indicating to switch from a source base station to a target base station, where the source base station may be a base station currently communicating with the UE, and the target base station may be a base station to which the source base station expects the UE to switch.
In a specific implementation, the UE may measure signal strengths of the source base station and the target base station when the high-speed train enters and exits, generate a measurement report, report the measurement report to the source base station, and the source base station may determine whether the communication quality of the target base station is better than that of the source base station according to the measurement report after receiving the measurement report, if not, may not perform handover, if not, the source base station may send a handover request message to the core network, and send a handover request to the target base station through the core network, and the target base station may detect whether its own resource can carry data transmission of the UE after receiving the handover request, if not, may return a rejection handover message to the core network, or else, if so, may return a handover permission message, and after receiving the handover permission message, the core network may send a base station handover instruction to the source base station, and when receiving the base station handover instruction, the source base station may issue an RRC connection reconfiguration message to the UE, so as to enable the UE to initiate random access to the target base station.
Step S220, the HARQ information fed back to the MAC layer by the user terminal is obtained through the RLC layer.
In a specific implementation, after the source base station issues the RRC connection reconfiguration message to the UE, the UE may feedback the HARQ message to the source base station according to whether the RRC connection reconfiguration message is correctly received, if so, may feedback the harq_ack to the source base station MAC layer, otherwise, if not, may feedback the harq_nack to the source base station MAC layer, and the RLC layer of the source base station may obtain the harq_ack or harq_nack message received by the MAC layer as the HARQ message of the RLC layer. For example, the source base station MAC layer may feed back the HARQ message to the RLC layer for the RLC layer to acquire the HARQ message.
It should be noted that, the UE may not receive the downlink control information, or the HARQ fed back by the UE is not received by the source base station physical layer, at this time, harq_dtx may be fed back to the source base station MAC layer, and the MAC layer may feed back a DTX (Discontinuous Transmission ) message to the RLC layer.
In step S230, if the HARQ message is NACK, the RLC layer is controlled to retransmit the RRC connection reconfiguration message.
In a specific implementation, if the MAC layer HARQ message obtained by the RLC layer of the source base station is harq_nack, it indicates that the UE fails to correctly receive the RRC connection reconfiguration message, and at this time, the source base station may control the RLC layer to retransmit the RRC connection reconfiguration message.
In practical applications, in general, the transmission resources are sufficient, the source base station may directly issue the RRC connection reconfiguration message to the user terminal, and in less cases, the situation of lack of transmission resources may occur, at this time, the RRC connection reconfiguration message may be fragmented, and new transmission and retransmission may be performed for each fragment, for example, the first fragment of the RRC connection reconfiguration message may be transmitted first, and when the RLC layer acquires the harq_ack of the MAC layer, the second fragment of the RRC connection reconfiguration message may be transmitted, or otherwise, if the RLC layer acquires the harq_nack of the MAC layer, the first fragment of the RRC connection reconfiguration message may be retransmitted.
The retransmission flag K may also be set at the RLC layer, and a retransmission initial value may be set for the retransmission flag in the initial case, for example, k=0 may be set, when the RLC layer acquires harq_nack of the MAC layer, the RRC connection reconfiguration message is retransmitted, and the retransmission flag is added by 1, for example, k=0+1=1 may be obtained, the maximum number of retransmissions K may also be set, if K is less than or equal to K, the current slice is allowed to be retransmitted, otherwise, if K is greater than K, all slices of the RRC connection reconfiguration message are retransmitted, and the retransmission flag K is reset to the initial value 0. For example, according to 3GPP TS38.331, the maximum number of RLC retransmissions in AM mode is 32, if k is less than or equal to 32, then the retransmission of the current slice is allowed, if k >32, then all slices of the RRC connection reconfiguration message are retransmitted, and the retransmission flag k is reset to 0.
When the RLC layer receives the DTX message fed back by the MAC layer, the same processing method as when the RLC layer receives the NACK message fed back by the MAC layer may be used to control the RLC layer to retransmit the RRC connection reconfiguration message.
According to the RRC connection reconfiguration message transmission method, when the base station switching instruction is received, the RRC connection reconfiguration message is issued to the user terminal, the RRC connection reconfiguration message can be sent to the user terminal when the target base station allows the base station to switch, the HARQ message fed back to the MAC layer by the user terminal is acquired through the RLC layer, if the HARQ message is NACK, the RRC connection reconfiguration message is controlled to be retransmitted by the RLC layer, and the MAC layer can also receive the ACK message when the signal intensity of the UE sent to the source base station is weaker, and the HARQ message of the MAC layer is adopted by the RLC layer, so that retransmission can be carried out only when the HARQ message is NACK, the retransmission times of the RRC connection reconfiguration message of the RLC layer are reduced, the interference of retransmission to other user terminals is reduced, and the base station switching reliability is improved. Moreover, the communication quality of the user can be ensured, the ping-pong switching rate is reduced, and the success rate of link connection is improved.
In one embodiment, the RLC layer is configured with a retransmission flag, and the RRC connection reconfiguration message transmission method further includes:
step S231, if the HARQ information is NACK, updating the retransmission identification according to the preset rule, and returning to the step of acquiring the HARQ information fed back to the MAC layer by the user terminal through the RLC layer;
in step S232, if the HARQ message is ACK, the retransmission flag is set to the retransmission initial value.
In a specific implementation, the retransmission flag k may be set at the RLC layer, and a retransmission initial value may be set for the retransmission flag in an initial case, for example, k=0 may be set. When the RLC layer acquires the harq_nack of the MAC layer, the RRC connection reconfiguration message (or the RRC connection reconfiguration message slice) is retransmitted, and the retransmission flag is updated according to a preset rule, for example, the retransmission flag may be added with 1 to obtain k=1, and then the HARQ message of the MAC layer may be acquired through the RLC layer for the retransmitted RRC connection reconfiguration message (or the RRC connection reconfiguration message slice), and if the HARQ message is the harq_ack, the retransmission flag may be reset to a retransmission initial value, for example, k may be reset from 1 to 0.
In this embodiment, if the HARQ message is NACK, the retransmission identifier is updated according to a preset rule, and the step of obtaining, by the RLC layer, the HARQ message fed back to the MAC layer by the user terminal is returned, so that the number of retransmissions can be recorded when the RRC connection reconfiguration message is retransmitted, and the number of retransmissions is avoided from being excessive, and if the HARQ message is ACK, the retransmission identifier is set as a retransmission initial value, so that statistics of the number of retransmissions of the next RRC connection reconfiguration message can be conveniently performed, and interference caused by the number of retransmissions to other UE communications is prevented.
In one embodiment, the step S210 may specifically include: the RRC connection reconfiguration message is segmented, so that the segmented RRC connection reconfiguration message is obtained; and sending the RRC connection reconfiguration message after the slicing to the user terminal.
Wherein slicing may be the operation of dividing a message into several pieces. The post-slicing RRC connection reconfiguration message may be an RRC connection reconfiguration message slice.
In a specific implementation, in general, transmission resources are sufficient, the source base station may directly issue an RRC connection reconfiguration message to the user terminal, and in less cases, a situation of lack of transmission resources may occur, at this time, the RRC connection reconfiguration message may be fragmented, and new transmission and retransmission may be performed for each fragment, for example, a first fragment of the RRC connection reconfiguration message may be transmitted first, and when the RLC layer acquires harq_ack of the MAC layer, a second fragment of the RRC connection reconfiguration message may be transmitted, or otherwise, if the RLC layer acquires harq_nack of the MAC layer, the first fragment of the RRC connection reconfiguration message may be retransmitted.
In this embodiment, the RRC connection reconfiguration message after the fragmentation is obtained by performing the fragmentation on the RRC connection reconfiguration message, and the fragmented RRC connection reconfiguration message is issued to the user terminal, so that incomplete transmission of the RRC connection reconfiguration message can be avoided under the condition of lack of transmission resources.
In one embodiment, the step S232 may specifically include: and if the HARQ information fed back by the user terminal is ACK after each RRC connection reconfiguration message after the fragments are issued, setting the retransmission identifier as a retransmission initial value.
In a specific implementation, the source base station may sequentially issue each RRC connection reconfiguration message slice, if each RRC connection reconfiguration message slice can be successfully transmitted within the maximum retransmission times, the RLC layer may acquire the harq_ack message for each RRC connection reconfiguration message slice fed back by the MAC layer, and then the source base station may reset the retransmission identifier to the retransmission initial value.
In this embodiment, if the HARQ messages fed back by the UE after issuing the RRC connection reconfiguration messages after each slice are all ACKs, the retransmission identifier is set to a retransmission initial value, so that statistics of the retransmission times of the next RRC connection reconfiguration message can be conveniently performed, and interference caused by excessive retransmission times to other UE communications is prevented.
In one embodiment, the step S231 may specifically include: if the HARQ message is NACK, a preset step length is added to the retransmission identifier to obtain an updated retransmission identifier; the preset step length comprises 1; and if the updated retransmission identification exceeds the preset maximum retransmission times, controlling the RLC layer to retransmit the full-part after-chip RRC connection reconfiguration message.
In a specific implementation, when the RLC layer acquires harq_nack of the MAC layer, the RRC connection reconfiguration message may be retransmitted to fragment, and the retransmission flag is added by 1, for example, the updated retransmission flag k=0+1=1 may be obtained, the maximum retransmission number K may be set, if K is less than or equal to K, the current fragment is allowed to be retransmitted continuously, otherwise, if K is greater than K, all fragments of the RRC connection reconfiguration message are retransmitted, and the retransmission flag K is reset to an initial value of 0.
In this embodiment, if the HARQ message is NACK, a preset step length is added to the retransmission identifier to obtain an updated retransmission identifier, so that the retransmission times can be recorded, and the retransmission times are prevented from being too many; if the updated retransmission identification exceeds the preset maximum retransmission times, the control RLC layer retransmits the RRC connection reconfiguration message after the whole part of the chip, and the whole RRC connection reconfiguration message can be retransmitted when the retransmission times are excessive, so that the switching reliability is improved.
In one embodiment, the RRC connection reconfiguration message transmission method further includes:
step S201, obtaining a measurement report reported by a user terminal;
step S202, determining whether to send a base station switching request to a target base station according to a measurement report;
step S203, if yes, receiving a switching response message fed back by the target base station;
step S204, if the switching response message is a base station switching instruction, the RRC connection reconfiguration message is issued to the user terminal so that the user terminal can access the target base station.
In a specific implementation, the UE may measure signal strengths of the source base station and the target base station when the high-speed train enters and exits, generate a measurement report, report the measurement report to the source base station, and the source base station may determine whether the communication quality of the target base station is better than that of the source base station according to the measurement report after receiving the measurement report, and may not perform handover if the communication quality is not better than that of the source base station, otherwise, if the communication quality is better than that of the source base station, the source base station may send a handover request message to the core network, and send a base station handover request to the target base station through the core network, and after receiving the base station handover request, the target base station may detect whether its own resource can carry data transmission of the UE, if the target base station cannot carry, may return a handover rejection message to the core network, otherwise, if the handover rejection message can be returned, and the core network may send a base station handover instruction to the source base station after receiving the handover permission message, and the source base station may issue an RRC connection reconfiguration message to the UE when receiving the base station handover instruction, so that the UE initiates random access to the target base station.
In this embodiment, by acquiring a measurement report reported by a user terminal, determining whether to send a base station switching request to a target base station according to the measurement report, the base station switching can be performed when it is determined that the communication quality of the target base station is better than that of a source base station, if the base station switching request is sent to the target base station, a switching response message fed back by the target base station is received, whether to perform the base station switching can be determined according to the bearing capacity of the target base station, if the switching response message is a base station switching instruction, an RRC connection reconfiguration message is issued to the user terminal, and when the communication quality of the target base station is better and the bearing capacity is provided, the user terminal can randomly access the target base station, thereby further improving the reliability of the base station switching.
In one embodiment, the RRC connection reconfiguration message transmission method further includes:
step S205, receiving RRC connection reconfiguration completion message fed back by the user terminal; the RRC connection reconfiguration complete message is a message fed back when the user terminal accesses the target base station.
In a specific implementation, after the source base station issues the RRC connection reconfiguration message to the UE, if the UE correctly receives the RRC connection reconfiguration message, RRC configuration may be performed according to the RRC connection reconfiguration message, and after RRC configuration is completed, the UE may feed back an RRC connection reconfiguration completion message to the source base station.
In this embodiment, by receiving the RRC connection reconfiguration complete message fed back by the user terminal, the user terminal may timely notify the source base station that the handover is completed when the user terminal completes RRC configuration, thereby improving the effectiveness and reliability of the base station handover.
In one embodiment, as shown in fig. 3, a flowchart of a method for transmitting an RRC connection reconfiguration message is provided, and the method is applied to a source base station for illustration, and includes the following steps:
step S310, when a base station switching instruction is received, the RRC connection reconfiguration message after slicing is obtained by slicing the RRC connection reconfiguration message;
step S320, the RRC connection reconfiguration message after the slicing is sequentially issued to the user terminal;
step S330, the HARQ information fed back to the MAC layer by the user terminal is obtained through the RLC layer;
step S340, if the HARQ message is NACK, controlling the RLC layer to retransmit the segmented RRC connection reconfiguration message, and updating the retransmission identification according to a preset rule to obtain an updated retransmission identification;
step S350, if the updated retransmission identifier does not exceed the preset maximum retransmission number, returning to step S330;
step S360, if the updated retransmission identification exceeds the maximum retransmission times, the RLC layer is controlled to retransmit all the segmented RRC connection reconfiguration messages;
step S370, if the HARQ message is an ACK, returning to step S320;
and step S380, if the HARQ messages fed back by the user terminal are ACK after each RRC connection reconfiguration message after the segmentation is issued, setting the retransmission identifier as the retransmission initial value.
It should be understood that, although the steps in the flowcharts of fig. 2-3 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 2-3 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, as shown in fig. 4, there is provided a timing chart of a base station handover method, in which a source base station includes s_du (Distributed Unit) and s_cu (Centralized Unit), a target base station includes t_du and t_cu, a core network includes AMF (Access and Mobility Management Function ) and UPF (User Plane Function, user plane management function), the base station handover method including the steps of:
step S401, after measuring signal intensity of source base station and target base station, user terminal equipment reports to source base station measurement report;
step S403, the source base station makes a switching decision after receiving the user terminal measurement report, if the switching is satisfied, a switching request message is initiated to the core network, and the core network sends a switching request to the target base station;
step S407, the target base station checks the resources after receiving the switching request, if the switching condition is satisfied, the bottom layer and the forwarding tunnel of the target base station are configured, and the core network switching request ACK is replied;
step S408, after receiving the switching confirmation of the target base station, the core network issues a switching command to the source base station;
step S410, after receiving the switching response message, the source base station transmits an RRC connection reconfiguration message to the user terminal, so that the user terminal initiates random access to the target base station;
in step S414, the ue sends an RRC connection reconfiguration complete message to the target base station, and random access is completed.
Step S410 is an improved handover procedure of the present application, in which the UE receives the RRC connection reconfiguration information of the source base station, after data demodulation, the UE replies harq_ack and rlc_ack to the base station MAC and RLC in AM mode, respectively, and the source base station does not receive rlc_ack due to weaker signal of the source base station or the UE is in a handover state and not transmitting the rlc_ack during handover, so that the source base station may resend the RRC connection reconfiguration information multiple times to ensure successful information transmission, but this will interfere with co-frequency handover of other UEs, and increase handover failure probability and time delay. In this case, the RLC marks the RRC connection reconfiguration information to be issued, and issues the information to the MAC layer, so as to avoid failure in RRC connection reconfiguration caused by influence of the segmentation issue, and if the source base station issues reconfiguration and receives the feedback harq_nack from the terminal, the RRC connection reconfiguration information is retransmitted.
In one embodiment, as shown in fig. 5, there is provided an RRC connection reconfiguration message transmission apparatus, including: a transmitting module 510, a receiving module 520, and a retransmitting module 530, wherein:
a sending module 510, configured to send the RRC connection reconfiguration message to the user terminal when receiving a base station handover command;
a receiving module 520, configured to obtain, by using the RLC layer, an HARQ message fed back to the MAC layer by the user terminal;
and a retransmission module 530, configured to control the RLC layer to retransmit the RRC connection reconfiguration message if the HARQ message is NACK.
In one embodiment, the RRC connection reconfiguration message transmitting apparatus further includes:
a NACK module, configured to update the retransmission identifier according to a preset rule if the HARQ message is NACK, and return to the step of obtaining, by the RLC layer, the HARQ message fed back to the MAC layer by the user terminal;
and the ACK module is used for setting the retransmission identifier as a retransmission initial value if the HARQ message is ACK.
In an embodiment, the sending module 510 is further configured to obtain the segmented RRC connection reconfiguration message by segmenting the RRC connection reconfiguration message; and transmitting the RRC connection reconfiguration message after the slicing to the user terminal.
In an embodiment, the above ACK module is further configured to set the retransmission flag to the retransmission initial value if HARQ messages fed back by the ue are ACKs after issuing the RRC connection reconfiguration messages after each of the fragments.
In an embodiment, the NACK module is further configured to, if the HARQ message is NACK, obtain an updated retransmission identifier by adding a preset step size to the retransmission identifier; the preset step length comprises 1; and if the updated retransmission identification exceeds the preset maximum retransmission times, controlling the RLC layer to retransmit all the segmented RRC connection reconfiguration messages.
In one embodiment, the RRC connection reconfiguration message transmitting apparatus further includes:
the acquisition module is used for acquiring a measurement report reported by the user terminal;
the judging module is used for determining whether to send a base station switching request to a target base station according to the measurement report;
the switching response message receiving module is used for receiving switching response messages fed back by the target base station if yes;
and the RRC connection reconfiguration message sending module is used for sending the RRC connection reconfiguration message to the user terminal if the switching response message is the base station switching instruction so that the user terminal can access the target base station.
In one embodiment, the RRC connection reconfiguration message transmitting apparatus further includes:
the RRC connection reconfiguration completion message receiving module is used for receiving the RRC connection reconfiguration completion message fed back by the user terminal; the RRC connection reconfiguration complete message is a message fed back when the user terminal accesses the target base station.
For specific limitations on the RRC connection reconfiguration message transmitting apparatus, reference may be made to the above limitations on the RRC connection reconfiguration message transmitting method, and no further description is given here. The above-described respective modules in the RRC connection reconfiguration message transmitting apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the communication device, or may be stored in software in a memory in the communication device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a communication device is provided, which may be a base station, the internal structure of which may be as shown in fig. 6. The communication device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the communication device is configured to provide computing and control capabilities. The memory of the communication device includes a non-volatile storage medium, an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the communication device is for storing RRC connection reconfiguration message transfer data. The network interface of the communication device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a RRC connection reconfiguration message transmission method.
It will be appreciated by those skilled in the art that the structure shown in fig. 6 is merely a block diagram of a portion of the structure associated with the present inventive arrangements and is not limiting of the communication device to which the present inventive arrangements are applied, and that a particular communication device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a communication device is provided that includes a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of an RRC connection reconfiguration message transmission method described above. The steps of an RRC connection reconfiguration message transmission method herein may be the steps of an RRC connection reconfiguration message transmission method of the above-described respective embodiments.
In one embodiment, a computer readable storage medium is provided, storing a computer program which, when executed by a processor, causes the processor to perform the steps of an RRC connection reconfiguration message transmission method described above. The steps of an RRC connection reconfiguration message transmission method herein may be the steps of an RRC connection reconfiguration message transmission method of the above-described respective embodiments.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A method for transmitting an RRC connection reconfiguration message, the method comprising:
when receiving a base station switching instruction, issuing the RRC connection reconfiguration message to the user terminal, wherein the issuing the RRC connection reconfiguration message to the user terminal comprises the following steps: issuing a first fragment of the RRC connection reconfiguration message to the user terminal;
acquiring HARQ information fed back to the MAC layer by the user terminal through the RLC layer;
if the HARQ message is NACK, controlling the RLC layer to retransmit the first fragment of the RRC connection reconfiguration message;
and if the HARQ message is ACK, transmitting the second fragment of the RRC connection reconfiguration message to the user terminal.
2. The RRC connection reconfiguration message transmission method according to claim 1, wherein the RLC layer is configured with a retransmission identity, the method further comprising:
if the HARQ information is NACK, updating the retransmission identification according to a preset rule, and returning to the step of acquiring the HARQ information fed back to the MAC layer by the user terminal through the RLC layer;
and if the HARQ message is ACK, setting the retransmission identifier as a retransmission initial value.
3. The RRC connection reconfiguration message transmission method according to claim 2, wherein the issuing the RRC connection reconfiguration message to the user terminal includes:
the RRC connection reconfiguration message is fragmented, so that the RRC connection reconfiguration message after the fragmentation is obtained;
the RRC connection reconfiguration message after the slicing is issued to the user terminal; the post-fragment RRC connection reconfiguration message includes the first fragment and the second fragment of the RRC connection reconfiguration message.
4. The RRC connection reconfiguration message transmission method according to claim 3, wherein if the HARQ message is an ACK, setting the retransmission flag to a retransmission initial value includes:
and if the HARQ messages fed back by the user terminal are ACK after each RRC connection reconfiguration message after the segmentation is issued, setting the retransmission identifier as the retransmission initial value.
5. The RRC connection reconfiguration message transmission method according to claim 3, wherein if the HARQ message is a NACK, updating the retransmission flag according to a preset rule includes:
if the HARQ message is NACK, a retransmission identifier after updating is obtained by adding a preset step length to the retransmission identifier; the preset step length comprises 1;
and if the updated retransmission identification exceeds the preset maximum retransmission times, controlling the RLC layer to retransmit all the segmented RRC connection reconfiguration messages.
6. The RRC connection reconfiguration message transmission method according to claim 1, wherein the method further includes:
acquiring a measurement report reported by the user terminal;
determining whether to send a base station switching request to a target base station according to the measurement report;
if yes, receiving a switching response message fed back by the target base station;
and if the switching response message is the base station switching instruction, the RRC connection reconfiguration message is issued to the user terminal so that the user terminal can access the target base station.
7. The RRC connection reconfiguration message transmission method according to claim 6, further comprising:
receiving an RRC connection reconfiguration completion message fed back by the user terminal; the RRC connection reconfiguration complete message is a message fed back when the user terminal accesses the target base station.
8. An RRC connection reconfiguration message transmitting apparatus, the apparatus comprising:
the sending module is configured to send the RRC connection reconfiguration message to the user terminal when a base station handover instruction is received, where the sending the RRC connection reconfiguration message to the user terminal includes: issuing a first fragment of the RRC connection reconfiguration message to the user terminal;
a receiving module, configured to obtain, by using an RLC layer, an HARQ message fed back to an MAC layer by the user terminal;
a retransmission module, configured to control the RLC layer to retransmit the first segment of the RRC connection reconfiguration message if the HARQ message is NACK;
and the sending module is further configured to send a second fragment of the RRC connection reconfiguration message to the user terminal if the HARQ message is an ACK.
9. A communication device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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