WO2010124475A1 - Method and device for sending message, method and device for receiving message - Google Patents

Abstract

A method and a device for sending a message are provided. The method for sending a message comprises: segmenting the message of Multimedia Broadcast/Multicast Service (MBMS) point-to-multipoint Control Channel (MCCH) in the current repetition period to obtain several message segments; numbering the message segments to obtain the numbers corresponding to the message segments according to the positions of the message segments in the message; the numbers corresponding to the same message segments of the message being the same during the modification period in which the current repetition period lies; sending the message segments and the corresponding numbers. A method and a device for receiving a message are also provided.

Description

 Method and device for transmitting message, method and device for receiving message

 The present invention relates to the field of communications technologies, and in particular, to a method for sending a message, and a method and a device for receiving a message. Background technique

 MBMS point-to-multipoint control channel (MCCH) in the Multimedia Broadcast Multicast Service (MBMS) of the UMTS Terrestrial Radio Access Network (UTRAN) system The bottom layer of the user plane protocol stack is the physical layer (PHY), and the upper layer of the PHY is the Radio Link Control (RLC) layer.

 Among them, the RLC layer has three transmission modes: Acknowledge Mode (AM), Unacknowledge Mode (UM), and Transparent Mode (TM). When data is transmitted under the AM, the data obtained after the RLC layer is packed is called the RLC AMD PDU; when the data is transmitted under the UM, the data obtained by the RLC layer is called the RLC UMD PDU; when the data is transmitted in the TM mode. The data obtained after the RLC layer is packaged is called the RLC TMD PDU. The RLC layer collectively refers to the data transmitted from the upper layer as the RLC Service Data Unit (SDU). In the UTRAN system, MCCH messages can be sent and received under UM.

 In the Evolved UMTS Terrestrial Radio Access Network (EUTRAN) system, if the UTRAN system uses the UMRAN system to transmit and receive MCCH messages under UM, the transmission efficiency will be low. Summary of the invention

Embodiments of the present invention provide a method for sending a message, a method and a device for receiving a message, to High transmission efficiency.

 An embodiment of the present invention provides a method for sending a message, including:

 Segmenting the multimedia broadcast multicast service point-to-multipoint control channel message of the current repetition period to obtain a plurality of message segments;

 Decoding the message segments according to the location of the message segment in the message, and obtaining a corresponding number of the message segment; wherein, in the modification period in which the current repetition period is located, the message is The same number of the same message segment is the same;

 Send the message segment and its corresponding number.

 The embodiment of the invention further provides a base station, including:

 a segmentation module, configured to segment the multimedia broadcast multicast service point-to-multipoint control channel message of the current repetition period to obtain a plurality of message segments;

 a numbering module, configured to number the message segments according to a location of the message segmentation in the message, to obtain a corresponding number of the message segment; wherein, the current repetition period is within a modification period The same message segment of the message has the same number;

 a transmission module, configured to send the message segment and its corresponding number.

 The embodiment of the invention further provides a method for receiving a message, including:

 Receiving, in the current modification period, a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and its corresponding number, the number indicating the location of the message segment in the message; Determining whether the message segment has been cached, and if not, buffering the message segment;

 When all message segments of the message are buffered, all of the message segments are reassembled into the multimedia broadcast multicast service point-to-multipoint control channel message according to the number of all message segments.

 The embodiment of the invention further provides a method for receiving a message, including:

Receiving and buffering a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and a corresponding number in a current repetition period, the number indicating a location of the message segment within the current modification period; At the end of the current repetition period, it is determined whether all message segments sent by the network side device in the current repetition period are received according to the cached number, and if not, all cached message segments and corresponding numbers are discarded; If so, all cached message segments are reassembled into the message based on the cached number.

 The embodiment of the invention further provides a user equipment, including:

 a first receiving module, configured to receive, in a current modification period, a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and a corresponding number thereof, where the number indicates that the message segment is in the message s position;

 a first processing module, configured to determine, according to the number, whether the message segment has been cached, and if not, to cache the message segment;

 a second processing module, configured to reassemble all the message segments into the multimedia broadcast multicast service point-to-multipoint control according to the number of all the message segments when all message segments of the message are buffered Channel message.

 The embodiment of the invention further provides a user equipment, including:

 a second receiving module, configured to receive and cache a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and a corresponding number in the current repetition period, where the number indicates that the message segment is in the current Modify the position within the period;

 a fourth processing module, configured to determine, according to the number of the cache, whether to receive all message segments sent by the network side device in the current repetition period according to the cached number, and if not, discard all cached The message segment and the corresponding number; if so, all cached message segments are reassembled into the message according to the cached number.

 In the embodiment of the present invention, the message sending end segments and numbers the MCCH message, and then sends the MCCH message, and accordingly, the message receiving end can reassemble the MCCH message according to the segment and the number, so that the message receiving end can efficiently process the received out-of-order. Data, thereby improving the transmission efficiency and quality of MCCH messages.

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. DRAWINGS

 1 is a flowchart of a method for sending a message according to Embodiment 1 of the present invention;

 2 is a flowchart of a method for receiving a message according to Embodiment 2 of the present invention;

 3 is a flowchart of another method for receiving a message according to Embodiment 3 of the present invention; FIG. 4 is a schematic structural diagram of a base station according to Embodiment 6 of the present invention;

 FIG. 5 is a schematic structural diagram of a user equipment according to Embodiment 7 of the present invention;

 FIG. 6 is a schematic structural diagram of another user equipment according to Embodiment 8 of the present invention. detailed description

In the embodiment of the present invention, the network side may segment and separately number the MCCH messages of each repetition period. Specifically, in each repetition period of the MCCH message, the RRC layer on the network side provides the generated MCCH message to the RLC layer, and the RLC layer divides the received MCCH message into n+1 segments, and generates n+1. The segments are numbered, ie 0, 1... to 1. According to the number, the above n +1 segments are referred to as a 0th segment, a 1st segment, an nth segment, respectively. Since the MCCH messages are the same in different repetition periods within one modification period, the N-th segment transmitted by the RLC layer on the network side in each repetition period of a modification period is performed by the above-mentioned method of separately numbering. The same (N is a positive integer between 0 and n), the same N-th segment is also the same, both N. Thus, the number of each segment can indicate the location of the segment in the MCCH message. Correspondingly, the RLC layer of the user equipment UE buffers the segment of the received MCCH message, and determines whether all segments of the MCCH message are received according to the number of the segment of the MCCH message. If yes, the RL C layer will All segments are cascaded and parsed and provided to the RRC layer of the UE for processing. If no, that is, the number of the segment received by the UE has a gap between 0 and n+1, the RLC layer of the UE keeps buffering the currently received segment, and continues to wait for the receiving network side to send in the next repetition period. Segmentation of the MCCH message until all segments of the above MCCH message are received. The reason why the RL C layer of the UE keeps buffering the currently received segment is that the newly received segment can be associated with the UE. The segmentation of the MCCH message received in the previous repetition period does not necessarily delete the segment of the MCCH message received in the previous repetition period, thereby improving the processing efficiency of the UE. If the RLC layer of the UE receives the same segment in different repetition periods, for example, the second segment, the UE may overwrite the cached second segment by using the newly received second segment, or may be lost. Discard the newly received segment 2 to improve processing efficiency. Further, in the next modification period of the MCCH message, if the MCCH message is changed, the network side will segment and number the modified MCCH message, and the UE may delete the cached MCCH message and cache it in the MCCH message. The segment of the MCCH message received in the current modification period. If the MCCH message in the next modification period is unchanged, the segment sent by the network side and its number may be the same as in the previous modification period, and the UE continues to receive the segment of the MCCH message, since the newly received segment can be associated with the UE. The segmentation of the MCCH message received in the previous modification period, therefore, the UE does not have to delete the segment of the MCCH message received in the previous modification period. In addition, after the RLC layer of the UE provides the received MCCH message to the RRC layer, the MCCH message segment sent by the network side in the current modification period may not be continuously received.

In the embodiment of the present invention, the network side may segment and serially number the MCCH messages of each repetition period. Specifically, in the first repetition period of the MCCH message, the RRC layer on the network side provides the generated MCCH message to the RLC layer, and the RLC layer divides the received MCCH message into m+1 segments, and generates m+1. The segments are numbered, ie 0, 1... to 111. According to the number, the above m+1 segments are referred to as the 0th segment, the 1st segment, the mth segment, respectively. In the second repetition period of the MCCH message, the RRC layer on the network side provides the generated MCCH message to the RLC layer, and the R LC layer divides the received MCCH message into m+1 segments, and generates m+1 segments. The segments are numbered, wherein the first segment number in the second repetition period is the last number in the first repetition period plus one, so each segment number in the second repetition period is m+1 in order. , m+2... to 2m+l. According to the number, the above m+1 segments are respectively referred to as the m+1th segment, the m+2 segment...the 2m+1 segment. Assuming that a modification period includes L repetition periods, the numbers of the segments in the Lth repetition period are (m+l)*(Ll), (m+l)*(Ll)+l... to (m+). l) *(Ll)+m. Therefore, each point The number of the segment can indicate the location of the segment within the current modification period. Correspondingly, if the number of the segment of the MCCH message received by the RLC layer of the UE in a modification period is different, the segment of the MCCH message received by the UE in each repetition period cannot be reused, that is, the UE is in the UE. If the number of the segment received in a certain repetition period is vacant, all the received segments in the repetition period are discarded. Only when the UE judges according to the number, when all the segments are received in one repetition period, all the segments are cascaded and parsed and provided to the RRC layer for processing.

 Example 1

 FIG. 1 is a flowchart of a method for sending a message according to Embodiment 1 of the present invention. The method includes:

 11. Segment the MCCH message of the current repetition period to obtain several message segments.

 12. Numbering the plurality of message segments to obtain corresponding numbers of the plurality of message segments; wherein the number indicates the location of the segment in the MCCH message.

 The corresponding number of the same message segment obtained by the MCCH message segment is the same in the modification period in which the current repetition period is located.

 13. Send the above several message segments and their corresponding numbers.

 In this embodiment, the MCCH message sending end can segment and number the MCCH message, which can improve the transmission efficiency and quality of the MCCH message, and is beneficial for the message receiving end to efficiently process the received out-of-order data. For example, when the message receiving end receives the out-of-order data, that is, the message segment with the discontinuous number, the message segment received in the different repetition periods may be reassembled, so that the instruction of the message sending end is notified in time and correspondingly processed.

 Optionally, in step 11 of the embodiment, the message sending end may segment the MCCH message in an upper layer of the RLC layer or the RLC layer, such as a radio resource control (RRC), or may negotiate the entity in the multi-cell. (MCE) is segmented.

 Preferably, the message sender can send in UM in step 13, use the message segment as the payload of the RLC PDU, and place its corresponding number in the header of the RLC PDU.

Example 2 FIG. 2 is a flowchart of a method for receiving a message according to Embodiment 2 of the present invention. The method includes:

 21. In the current modification period, receive the message segment of the MCCH message and the corresponding number. Where the number indicates the location of the message segment in the MCCH message.

 22. Determine whether the message segment has been cached according to the number, and if not, cache the message segment.

 23. When all message segments of the message are cached, all message segments are reassembled into MCCH messages. For example, it is determined whether all message segments of the message have been cached according to the number of each message segment, and if so, the MCCH message is reassembled according to the number of the message segment.

 In this embodiment, the message receiving end reorganizes the MCCH message according to the segment and the number, so that the received out-of-order data can be processed efficiently, and the transmission efficiency and quality of the MCCH message are improved.

 Preferably, in step 21, the message segment received by the message receiving end and its corresponding number are in one RLC PDU, for example, the message segment is used as the payload of the RLC PDU, and the number is placed in the header of the RLC PDU. In step 22, the message receiving end determines whether the RLC PDU with the number in the packet header is buffered, and if not, caches the RLC PDU. In step 23, the message receiving end reassembles the message segments in each RLC PDU according to the corresponding number order to form a complete RL C SDU and provides the upper layer of the RLC, and the upper layer reads the content of the MCCH message.

 Optionally, the message receiving end discards the cached message segment when the next modification period comes. In this embodiment, in different repetition periods in the same modification period, each message segment received by the message receiving end may be merged. Therefore, it is not necessary to discard the cached message segment at the end of each repetition period. The processing efficiency of the message receiving end is obviously provided.

 Example 3

 FIG. 3 is a flowchart of another method for receiving a message according to Embodiment 3 of the present invention, where the method mainly includes:

31. In the current repetition period, the message segment of the MCCH message and the corresponding number are received and buffered. Wherein, the number indicates the location of the message segment within the current modification period. 32. At the end of the current repetition period, it is determined according to the number whether all message segments sent by the network side device in the current repetition period are received, and if not, all cached message segments and corresponding numbers are discarded; if yes, Then, according to the number, all the message segments received and buffered in the current repetition period are reassembled into MCCH messages.

 In this embodiment, the corresponding number of each message segment identifies the location of the message segment in the current modification period. Therefore, in different repetition periods within the same modification period, the message segments received by the message receiving end are not segmented. Can be combined. At the end of each repetition period, the message receiving end discards the cached message segment, which can obviously save the buffer space of the message receiving end.

 Example 4

 In this embodiment, the RLC layer of the network side device segments the MCCH message, and separately segments the generated message segments, that is, the same segment generated by the same MCCH message segment in different repetition periods (that is, as the RLC PDU. The payload number is the same. Accordingly, the user equipment reassembles the MCCH message according to the unique number. The details are described below.

 Assume that a modification period includes two repetition periods. In the first repetition period, the RLC layer of the network side device segments, numbers, and transmits the MCCH message. In the second repetition period, the RLC layer pair of the network side device The same MCCH message in the first repetition period is segmented, numbered, and transmitted. ^The MCCH message in the first repetition period is divided into 3 segments, numbered 0, 1, and 2, respectively. The segment 0 to segment 2 will be used as the payload of the 3 RLC PDUs respectively. The number of the location (ie, the segmentation order) of each segment in the MCCH message is placed in the header of the RLC PDU in which the segment is located. The three segments divided into MCCH messages in the second repetition period are the same as the three segments transmitted in the first repetition period, and the numbers are also 0, 1, and 2 respectively, so 3 are sent. The RLC PDU is the same as the three RLC PDUs sent during the first repetition period.

Specifically, the packet header of the three PDUs sent by the network side device may include one or more indications in the packet header according to the negotiation or the agreement, in addition to the SN, that is, the number of the foregoing segment, so that the user equipment UE processes the reception. RLC PDU to. Of course, if an indication is null or default, it means that the item is not involved or unqualified. For SN and other indications, this embodiment does not It is permissible to limit the number of occupied bits, depending on the situation. The above instructions include but are not limited to the following examples:

 FI, used to indicate whether the RLC PDU is the first segment, the middle segment, or the last segment of the RLC SDU;

 LI, used to indicate the length of the segment in the RLC PDU;

 PI, used to indicate whether there is padding in the RLC PDU.

 For example: the payload of the first RLC PDU is the 0th segment; the SN in the header is 000, indicating that the segment is the 0th segment of the MCCH message; the FI is 00, that is, the PDU is the first of the RLC SDU Segment; LI is 0110... , indicating the segment length; the PDU does not include PI, that is, no padding.

 The payload of the second RLC PDU is the first segment; the SN in the packet header is 001, indicating that the segment is the first segment of the MCCH message; the FI is 01, that is, the PDU is the middle segment of the RLC SDU; LI is 0110... , indicating the segment length; the PDU does not include PI, that is, no padding.

 The payload of the third RLC PDU is the second segment; the SN in the packet header is 010, indicating that the segment is the 0th segment of the MCCH message; the FI is 10, that is, the PDU is the last segment of the RLC SDU; LI is 0110... , indicating the segment length; the PDU does not include PI, that is, no padding.

 In the first repetition period, the RLC UM entity of the user equipment UE may only receive the second RLC PDU, and the RLC UM entity of the UE caches the RLC PDU, and does not discard the PDU at the end of the repetition period. . If the RLC UM entity of the UE receives the 1st and 3rd RLC PDUs in the second repetition period, it is determined according to the SN that all message segments of the MC CH message have been cached, thereby sorting the RLCs. The PDU constitutes an RLC SDU, which is provided to its upper layer entity and learns the contents of the MCCH message. If the RLC UM entity of the UE receives only the first RLC PDU in the second repetition period, it may be determined according to the SN that all message segments of the MCCH message are not buffered in the modification period, and therefore, the UE may discard All cached content, for example, the buffer of the cached MCCH message segment is cleared, and the MCCH message segment sent by the network side device is received and buffered in the next modification period.

In this embodiment, the message sending end segments and numbers the MCCH message, and then sends the MCCH message, and accordingly, the message receiving end can reassemble the MCCH message according to the segment and the number, so that the message can be received. The end efficiently processes the received out-of-order data, thereby improving the transmission efficiency and quality of the MCCH message. Example 5

 In this embodiment, the RLC layer of the network side device segments the MCCH message, and associates the generated message segments with the same number, that is, the same segment generated by the same MCCH message segment in different repetition periods (that is, as the RLC PDU. The number of the payload is different. The difference between the numbers of the same segments in two consecutive repetition periods is the total number of segments of one MCCH message. Accordingly, the user equipment reassembles the MCCH message according to the consecutive number. The details are described below.

 Assume that a modification period includes two repetition periods. In the first repetition period, the RLC layer of the network side device segments, numbers, and transmits the MCCH message. In the second repetition period, the RLC layer pair of the network side device The same MCCH message in the first repetition period is segmented, numbered, and transmitted. Different from Embodiment 4, it is assumed that the MCCH message in the first repetition period is divided into three segments, numbered 0, 1, and 2, respectively, and the MCCH message in the second repetition period is divided into three segments. The segment numbers are 3, 4, and 5, respectively, and the RLC PDUs numbered 3 to 5 and the RLC PDUs numbered 0 to 2 cannot be combined.

 Specifically, the indications of the PDUs of the three PDUs that are sent by the network side device, except for the SN, that is, the number of the foregoing suffixes, refer to the description of Embodiment 4, and details are not described herein again.

 In the first repetition period, the RLC UM entity of the user equipment UE may only receive the second RLC PDU, and the RLC UM entity of the UE may not be in the repetition according to the SN judgment at the end of the first repetition period. All message segments of the MCCH message are buffered during the period, and therefore, the buffered RLC PDU is discarded. If the RLC UM entity of the UE receives 3 RLC PDUs in the second repetition period, it is determined according to the SN that all message segments of the MCCH message have been buffered, thereby forming the sorted RLC PDUs into one RLC SDU, providing Give it an upper layer entity and get the contents of the MCCH message.

In this embodiment, the message sending end segments and numbers the MCCH message, and then sends the MCCH message, and correspondingly, the message receiving end can reassemble the MCCH message according to the segment and the number. In particular, in a repeating cycle, when the message receiving end fails to receive all the message segments, the cached content is discarded. Thereby, the processing complexity of the MCCH message is reduced, the processing efficiency is improved, and the buffer space of the message receiving end is saved.

 Example 6

 FIG. 4 is a schematic structural diagram of a base station according to Embodiment 6 of the present invention. The base station can implement the above embodiments of the present invention. The base station can include: a segmentation module 41, a numbering module 42, and a transmission module 43. The segmentation module 41 is configured to segment the MCCH message of the current repetition period to obtain a plurality of segments of the MCCH message, and the numbering module 42 is configured to number the message segments according to the location of the message fragment in the message. And obtaining the corresponding number of the message segment; wherein, in the modification period in which the current repetition period is located, the same message segment of the message has the same number; the transmission module 43 is configured to send the message segment and its corresponding number. See the above method examples for details.

 In this embodiment, the base station can segment and number the MCCH message, which can improve the transmission efficiency and quality of the MCCH message, and is beneficial for the message receiving end to efficiently process the received out-of-order data. In this embodiment, the base station segments the MCCH message by using the segmentation module, and separately numbers by the numbering module, and sends the segment by the transmission module, which implements the EUTRAN system to send and process the MCCH message, and effectively improves the MCCH message. Send quality.

 The foregoing transmission module may be specifically configured to send an RLC PDU, where the payload of the RLC PDU includes the foregoing message segment, and the packet header of the RLC PDU includes a corresponding number of the message segment.

 The base station may further include a selection module for selecting a transmission mode. At this time, the foregoing transmission module is specifically configured to transmit the segment according to the selected transmission mode.

 Example 7

FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. The UE can implement the above embodiments of the present invention. The UE may include: a first receiving module 51, a first processing module 52, and a second processing module 53. The first receiving module 51 is configured to receive the message segment of the MCCH message and its corresponding number in the current modification period, where the number indicates the location of the message segment in the message; the first processing module 52 is configured to use the number according to the foregoing Determine whether the above message segmentation has been cached. If not, the message segment is cached. The second processing module 53 is configured to reassemble all the message segments into the MCCH message according to the number of all the message segments when all the message segments of the message are buffered.

 In this embodiment, the UE reassembles the MCCH message according to the segment and the number, so that the received out-of-order data can be processed efficiently, and the transmission efficiency and quality of the MCCH message are improved.

 The UE may further include: a third processing module. At the end of the modification period where the current modification period ends, all message segments cached by the first processing module are discarded.

 The foregoing first receiving module may be further configured to receive an RLC PDU, where the payload of the RLC PDU includes the foregoing message segment, and the packet header of the RLC PDU includes a corresponding number of the message segment.

 Example 8

 FIG. 6 is a schematic structural diagram of another user equipment according to Embodiment 8 of the present invention. The user equipment UE may include: a second receiving module 61 and a fourth processing module 62. The second receiving module 61 is configured to receive and cache the message segment of the MCCH message and the corresponding number in the current repetition period, where the number indicates the location of the message segment in the current modification period; and the fourth processing module 62 is configured to: At the end of the current repetition period, it is determined whether all message segments sent by the network side device in the current repetition period are received according to the cached number, and if not, all cached message segments and corresponding numbers are discarded; Yes, all cached message segments are reassembled into the above messages according to the cached number.

 In this embodiment, the corresponding number of each message segment indicates the location of the message segment in the current modification period. Therefore, in different repetition periods within the same modification period, the message segments received by the UE may not be merged. . At the end of each repetition period, the UE discards the cached message segments, which can significantly save the buffer space of the message receiving end.

The foregoing method and device embodiment is based on the sending period of the high-level message and the underlying retransmission mechanism, and provides a corresponding transmission mode and processing flow, which simplifies the processing flow and data packet format of the current EUTRAN system, and serially numbers the RLC PDUs to perform messages. Fast reception, avoiding a large amount of useless data occupation cache and RLC PDU serial number confusion; and by RLC PDU separately numbering, do not The combination of the same period of RLC PDUs improves the reception efficiency.

 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. The foregoing storage medium includes: ROM, RAM, magnetic disk or optical disk, and the like, which can store various program codes. Finally, the above embodiments are only used to illustrate the technical solution of the present invention. The invention is described in detail with reference to the foregoing embodiments, and those of ordinary skill in the art should understand that the technical solutions described in the foregoing embodiments may be modified or some of the techniques may be The features are equivalent to the equivalents; and the modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request A method for sending a message, comprising:  Segmenting the multimedia broadcast multicast service point-to-multipoint control channel message of the current repetition period to obtain a plurality of message segments;  Decoding the message segments according to the location of the message segment in the message, and obtaining a corresponding number of the message segment; wherein, in the modification period in which the current repetition period is located, the message is The same number of the same message segment is the same;  Send the message segment and its corresponding number.  2. The method for sending a message according to claim 1, wherein the sending the message segment and its corresponding number comprises:  Transmitting a radio link control protocol data unit, the payload of the radio link control protocol data unit including the message segment, the header of the radio link control protocol data unit including a corresponding number of the message segment.  3. A method of transmitting a message according to claim 2, wherein said means for transmitting said cancellation, segment and their corresponding number is a non-acknowledge mode.  4. A method for receiving a message, comprising:  Receiving, in the current modification period, a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and its corresponding number, the number indicating the location of the message segment in the message; Determining whether the message segment has been cached, and if not, buffering the message segment;  When all message segments of the message are buffered, all of the message segments are reassembled into the multimedia broadcast multicast service point-to-multipoint control channel message according to the number of all message segments.  5. The method of receiving a message according to claim 4, wherein: At the end of the modification period in which the current modification period ends, all cached message segments are discarded. The method for receiving a message according to claim 4 or 5, wherein the message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and its corresponding number include:  Receiving a radio link control protocol data unit, the payload of the radio link control protocol data unit includes the message segment, and the packet header of the radio link control protocol data unit includes a corresponding number of the message segment.  7. A method for receiving a message, comprising:  Receiving and buffering a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and a corresponding number in a current repetition period, the number indicating a location of the message segment within the current modification period;  At the end of the current repetition period, it is determined whether all message segments sent by the network side device in the current repetition period are received according to the cached number, and if not, all cached message segments and corresponding numbers are discarded; If so, all cached message segments are reassembled into the message based on the cached number.  8. A base station, comprising:  a segmentation module, configured to segment the multimedia broadcast multicast service point-to-multipoint control channel message of the current repetition period to obtain a plurality of message segments;  a numbering module, configured to number the message segments according to a location of the message segmentation in the message, to obtain a corresponding number of the message segment; wherein, the current repetition period is within a modification period The same message segment of the message has the same number;  a transmission module, configured to send the message segment and its corresponding number.  9. The base station according to claim 8, wherein:  The transmission module is specifically configured to send a radio link control protocol data unit, where a payload of the radio link control protocol data unit includes the message segment, and a packet header of the radio link control protocol data unit includes the message Segment the corresponding number. 10. A user equipment, comprising: a first receiving module, configured to receive, in a current modification period, a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and a corresponding number thereof, where the number indicates that the message segment is in the message s position;  a first processing module, configured to determine, according to the number, whether the message segment has been cached, and if not, to cache the message segment;  a second processing module, configured to reassemble all the message segments into the multimedia broadcast multicast service point-to-multipoint control according to the number of all the message segments when all message segments of the message are buffered Channel message.  The user equipment according to claim 10, further comprising:  And a third processing module, configured to discard all message segments buffered by the first processing module when the modification period where the current modification period ends.  The user equipment according to claim 10 or 11, wherein the first receiving module is specifically configured to receive a radio link control protocol data unit, where the payload of the radio link control protocol data unit includes The message segmentation, the packet header of the radio link control protocol data unit includes a corresponding number of the message segment.  13. A user equipment, comprising:  a second receiving module, configured to receive and cache a message segment of the multimedia broadcast multicast service point-to-multipoint control channel message and a corresponding number in the current repetition period, where the number indicates that the message segment is in the current Modify the position within the period;  a fourth processing module, configured to determine, according to the number of the cache, whether to receive all message segments sent by the network side device in the current repetition period according to the cached number, and if not, discard all cached The message segment and the corresponding number; if so, all cached message segments are reassembled into the message according to the cached number.