CN115460714A - System message receiving method and system under non-broadcast mode - Google Patents
System message receiving method and system under non-broadcast mode Download PDFInfo
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of 5GNR system access, in particular to a system message receiving method and a system under a non-broadcast mode, which comprises the following steps: s1: receiving a second message sent by the base station; s2: judging whether other external user equipment requesting the system message from the base station exists according to the second message; if yes, acquiring a system message window initial position of the system message, and then turning to S4; if not, sending a first message to the base station to obtain the initial position of a system message window; s4: receiving the system message at the starting position of the system message window. The beneficial effects are that: when receiving a second message fed back by the system, further analyzing the second message, thereby judging whether other external user equipment subscribing the system message exists; when the system message window exists, the initial position of the corresponding system message window is directly obtained according to the second message, so that the subsequent interaction process is omitted, and the receiving efficiency of the system message is improved.
Description
Technical Field
The invention relates to the technical field of 5GNR system access, in particular to a system message receiving method and a system under a non-broadcast mode.
Background
5G NR (New Radio) is a global 5G standard for a completely New air interface design based on OFDM (Orthogonal Frequency Division Multiplexing). In this system, the base station (gNB) has a broadcast mode (Broadcasting) or a non-broadcast mode (notbroadcast). In different modes, the base station may select to control some Other System message (OSI) to be periodically sent in a broadcast mode, or only when a User Equipment (UE) requests the base station to send a System message, the base station performs On-demand broadcast SI (OSI).
In the prior art, when the user equipment needs to receive the system message sent by the base station in the non-broadcast mode, the user equipment needs to initiate an odoosi request to the base station. Specifically, a user sends a first message (Msg 1, message 1) to a base station in a random access manner, wherein the first message contains a preamble of user equipment (ue) and is used for indicating a system message which needs to be requested to the base station; when the base station equipment receives a first message sent by the user equipment, a second message (Msg 2, message 2) is sent to the user equipment, wherein the second message comprises a response to the first message, which indicates that the base station has received a request initiated by the user equipment and will send a corresponding system message, and at this time, the user equipment can calculate a system message window (SI-window) of the system message (SI) according to OSI configuration in a system message SIB1, so that the user equipment can acquire a subsequent system message sent by the base station on the system message window.
However, in an actual implementation process, the inventor finds that, in the implementation of the above scheme, the user equipment is usually required to perform a complete process of sending the first message and receiving the second message, so as to be able to determine the system message window position for receiving the system message, and when there are multiple system messages to be received, the above steps need to be repeatedly performed to obtain the corresponding system message window position, that is, for each system message that needs to be requested, the above procedures of sending the first message to request the system message, receiving the second message to determine whether the base station responds, and receiving the system message need to be completely performed, which causes a relatively lengthy overall receiving process.
Disclosure of Invention
In view of the above problems in the prior art, a method for receiving system messages in a non-broadcast mode is provided; in another aspect, a system message receiving system for implementing the system message receiving method is also provided.
The specific technical scheme is as follows: a receiving method of system information under non-broadcast mode is suitable for user equipment to obtain system information under non-broadcast mode, and comprises: step S1: receiving a second message sent by the base station; step S2: judging whether other external user equipment which requests the system message from the base station exists according to the second message; if yes, acquiring a system message window initial position of the system message, and then turning to the step S4; if not, turning to the step S3; and step S3: sending a first message to the base station to request the system message from the base station and generate the system message window starting position; and step S4: and receiving the system message at the starting position of the system message window.
On the other hand, the step S1 includes: step S11: receiving system message response configuration sent by the base station; step S12: and generating and sending the first message to the base station according to the system message response configuration so as to receive the second message fed back by the base station.
On the other hand, the step S2 includes: step S21: extracting sub-headers of all protocol data units from the second message; step S22: judging whether the external user equipment exists according to the random access lead code in the sub-header; if yes, acquiring the initial position of the system message window, and then turning to the step S4; if not, the step is switched to the step S3.
On the other hand, in the step S22, the method for acquiring the starting position of the system message window includes: step A1: extracting a plurality of random access preamble indexes from the second message; step A2: judging a system message window of the system message requested by the external user equipment according to the random access lead code and the random access lead code index; step A3: and generating the starting position of the system message window as the starting position of the system message window.
On the other hand, the step S3 includes: step S31: selecting a lead code corresponding to the system message according to the system response configuration, and sending the first message to the base station according to the lead code; step S32: receiving the second message fed back by the base station; step S33: and generating the starting position of the system message window.
A system message receiving system in a non-broadcast mode, for implementing the system message receiving method, comprising: a message receiving module, which receives a second message of the base station; the judging module is connected with the message receiving module and judges whether other external user equipment requesting the system message from the base station exists or not according to the second message; the first system message window generating module is connected with the judging module and acquires the initial position of a system message window of the system message; a second system message window generating module, connected to the judging module, for sending the first message to the base station to request the base station for the system message and generating the initial position of the system message window; the system message receiving module is respectively connected with the first system message window generating module and the second system message window generating module, and receives the system message at the initial position of the system message window.
In another aspect, the message receiving module includes: a first receiving module, configured to receive a system message response configuration sent by the base station; the first preamble sending module is connected to the first receiving module, and the first preamble sending module generates and sends the first message to the base station according to the system message response configuration to receive the second message fed back by the base station.
In another aspect, the discrimination module includes: a sub-header extraction module that extracts sub-headers of all protocol data units from the second message; the sub-header judging module judges whether the external user equipment exists according to a random access lead code in the sub-header; and the output selection module is connected with the sub-header judgment module and selects the first system message window generation module or the second system message window generation module according to the output result of the sub-header judgment module.
In another aspect, the first system message window generating module includes: the index extraction module extracts a plurality of random access preamble indexes from the system message response configuration; a system message window judging module, connected to the index extracting module, for judging the system message window of the system message requested by the external user equipment according to the random access preamble and the random access preamble index; and the first position generation module is connected with the system message window judgment module and judges the initial position of the system message window as the initial position of the system message window.
In another aspect, the second system message window generating module includes: a second preamble sending module, configured to select a preamble corresponding to the system message according to the system response configuration, and send the first message to the base station according to the preamble; a second receiving module, configured to receive the second message fed back by the base station; and the second position generation module is connected with the second receiving module and generates the initial position of the system message window.
The technical scheme has the following advantages or beneficial effects: aiming at the problem that the time consumption for acquiring a system message window is long in the prior art, in the scheme, when a second message fed back by a system is received, the second message is further analyzed and judged, so that whether other external user equipment requesting the system message to a base station exists or not is judged; when the external user equipment exists, the initial position of the corresponding system message window is directly obtained through analysis according to the second message, so that the subsequent processes of sending the uplink message again, obtaining the second message and obtaining the system message window through analysis are omitted, and the receiving efficiency of the system message is improved.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
Fig. 1 is a schematic diagram of a system message receiving method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the substep of step S1 in the embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the substep of step S2 in the embodiment of the present invention;
FIG. 4 is a diagram illustrating a method for generating a starting position of a system message window according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the substep of step S3 according to an embodiment of the present invention;
FIG. 6 is a diagram of a system message receiving system according to an embodiment of the present invention;
FIG. 7 is a diagram of a sub-module of a message receiving module according to an embodiment of the present invention;
FIG. 8 is a sub-module of a determination module according to an embodiment of the present invention;
FIG. 9 is a block diagram of a first system message window generation module according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a second system message window generation module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The technical solution described in the present invention is implemented on the basis of the 3GPP TS 38.331 standard and the 3GPP TS 38.321 standard, and the other parts not described in detail refer to the 3GPP TS 38.331 standard and the 3GPP TS 38.321 standard.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The invention comprises the following steps: a receiving method of system information under non-broadcast mode is suitable for user equipment to obtain system information under non-broadcast mode, and the receiving method of system information includes: step S1: receiving a second message sent by the base station; step S2: judging whether other external user equipment requesting the system message from the base station exists according to the second message; if yes, acquiring a system message window initial position of the system message, and then turning to the step S4; if not, turning to the step S3; and step S3: sending a first message to a base station to request the base station for a system message and generate a system message window starting position; and step S4: and receiving the system message at the starting position of the system message window.
Specifically, aiming at the problem that in the prior art, when receiving a system message in a non-broadcast mode, user equipment needs to send a first message containing a preamble to obtain a corresponding system message window, and when a plurality of system messages needing to be received exist, the first message needs to be repeatedly sent to obtain the receiving window position of each system message, which takes a long time, in the embodiment, whether other external user equipment requesting the system message exists is further judged according to the second message in the process of receiving the second message, and if the external user equipment requests the system message window of the system message, the system message window of the system message requested by the external user equipment is used as a system message window available to local user equipment; and if not, sending the first message to acquire a system message window required by subsequent user equipment so as to reduce the sending times of the first message. The "external UE" is the same UE as a local UE in the communication standard, and is only used for distinguishing from the local UE in the present scheme, which means that the external UE is another UE that is accessed to the base station as the local UE, and does not limit an actual device type.
In one embodiment, as shown in fig. 2, step S1 comprises: step S11: receiving system message response configuration sent by a base station; step S12: and generating and sending a first message to the base station according to the system message response configuration so as to receive a second message fed back by the base station.
In the implementation process, in order to achieve a better receiving effect on the System message, the user equipment may receive an SIB1 broadcast sent by the base station on a public parameter broadcast channel (SIB 1) of a Minimum System Message (MSI), and may confirm whether the current base station configures a System message response configuration (SI-RequestConfig) through the SIB1 broadcast, and if so, it indicates that the current base station may acquire a System message window based on a first message request form; if not, the system message is requested from the base station by switching to a third message (Msg 3), which is implemented with reference to the related part of the prior art, for example, the related part of the 3GPP TS 38.331 protocol related to the osi request.
By reading the system message response configuration, the method can be used for acquiring a plurality of system messages configured as a non-broadcast mode by the current base station, and for reading a Preamble index (Preamble index) set of the system messages.
For example, as shown in table 1 below, the base station configures three system messages in non-broadcast mode, including SI1, SI2, and SI3, where the random access preamble index start bits (ra-preamble index) are 40, 48, and 56; the set of Synchronization Signal Blocks (SSBs) is 8, including SSBs #0 to SSBs #7.
Then, the random access lead code index (preamble index) corresponding to the system message SI1 includes lead codes 40 to 47, the random access lead code index (preamble index) corresponding to the system message SI2 includes lead codes 48 to 55, and the random access lead code index (preamble index) corresponding to the system message SI3 includes lead codes 56 to 63.
TABLE 1
After the user acquires the system message response configuration, according to the system message that the user needs to receive, such as the system message SI1 and/or the system message SI2, the corresponding preamble is added to the first message to request the base station to obtain the system message window of the corresponding system message, and the base station adds the preamble sent by the user equipment to the second message as feedback, indicating that the request sent by the user equipment is correctly received.
In one embodiment, step S2 as shown in fig. 3 comprises: step S21: extracting all sub-headers of the PDU from the second message; step S22: judging whether external user equipment exists according to the random access lead code in the sub-header; if yes, acquiring the initial position of a system message window, and then turning to the step S4; if not, the process goes to step S3.
Specifically, for the problem that in the prior art, when receiving a system message in a non-broadcast mode, user equipment needs to send a first message including a preamble to obtain a corresponding system message window, and when there are multiple system messages that need to be received, the user equipment needs to repeatedly send the first message to obtain a receiving window position of each system message, which takes a long time, in this embodiment, after sending the first message and obtaining the second message to a base station, a Sub-header (Sub-header) of a Protocol Data Unit (PDU) in the second message is extracted, so that multiple Sub-headers are obtained. The subheader includes an Extension field (Extension), a Type field (Type), and the like. The method comprises the steps of reading a Random Access Preamble Identifier (RAPID) in a sub header, judging whether an external user equipment which sends a first message and requests a corresponding system message exists, detecting the external user equipment, and enabling the user equipment to select a system message window which acquires the system message requested by the external user equipment or automatically send the first message to request the system message window according to a detection result.
In one embodiment, as shown in fig. 4, the method for generating the start position of the system message window in step S21 includes: step A1: extracting a plurality of random access preamble indexes from system message response configuration; step A2: judging a system message window requested by external user equipment according to the random access lead code and the random access lead code index; step A3: and generating the starting position of the system message window as the starting position of the system message window.
Specifically, aiming at the problem that in the prior art, when receiving a system message in a non-broadcast mode, user equipment needs to send a first message containing a preamble to obtain a corresponding system message window, and when a plurality of system messages needing to be received exist, the first message needs to be repeatedly sent to obtain the receiving window position of each system message, which takes a long time.
For example, in the base station configured with the system message SI1, the system message SI2, and the system message SI3 in the non-broadcast mode, after receiving the second message, the local user equipment searches a plurality of protocol data units in the second message to obtain that the value of the random access preamble contained in one of the protocol data units is 48, and the random access preamble is matched with SSB #0 of the system message2 in the random access preamble index, which indicates that the external user equipment requests the system message window of the system message from the base station, so that the local user equipment does not need to further send the first message to the base station to request the system message from the base station, but directly obtains fields such as a window length in the system response configuration to calculate the start position of the system message window, and then directly reads the system message requested by the external user equipment at the start position.
In one embodiment, as shown in fig. 5, step S3 comprises: step S31: selecting a lead code corresponding to the system message according to the system response configuration, and sending a first message to the base station according to the lead code; step S32: receiving a second message fed back by the base station; step S33: and generating a system message window starting position.
Specifically, in order to implement receiving of a system message, in this embodiment, when it is determined that an external ue does not initiate a request of a system message to a base station, a local ue determines a preamble of the system message to be requested by searching for a system response configuration, sends a first message according to the preamble, requests the base station for the system message, and receives a second message fed back by the base station, thereby implementing a request procedure of a system message window of the system message.
A system message receiving system in non-broadcast mode, for implementing the above system message receiving method, as shown in fig. 6, includes: the message receiving module 1 is used for receiving a second message of the base station by the message receiving module 1; the judging module 2 is connected with the message receiving module 1, and the judging module 2 judges whether other external user equipment requesting system messages to the base station exists or not according to the second message; the first system message window generating module 3 is connected with the judging module 2, and the first system message window generating module 3 acquires the initial position of a system message window of the system message; the second system message window generating module 4 is connected with the judging module 2, and the second system message window generating module 4 sends a first message to the base station to request the base station for a system message and generate a system message window initial position; the system message receiving module 5, the system message receiving module 5 is connected to the first system message window generating module 3 and the second system message window generating module 4, respectively, and the system message receiving module 5 receives the system message at the initial position of the system message window.
Specifically, for the problem in the prior art that receiving a system message in a non-broadcast mode requires a user equipment to send a first message containing a preamble to obtain a corresponding system message window, and when there are a plurality of system messages to be received, the first message needs to be repeatedly sent to obtain a receiving window position of each system message, which takes a long time, in this embodiment, after a message receiving module 1 receives a second message, a determination module 2 further determines whether there is another external user equipment that has requested a system message from a base station according to the second message, and if so, a first system message window generating module 3 uses the system message window of the system message requested by the external user equipment as a system message window available to a local user equipment; if not, the second system message window generating module sends the first message to obtain a system message window required by subsequent user equipment, and the system message receiving module 5 can receive the system message on the system message window, so as to reduce the sending times of the first message.
In one embodiment, as shown in fig. 7, the message receiving module 1 includes: a first receiving module 11, where the first receiving module 11 receives a system message response configuration sent by a base station; the first preamble sending module 12, the first preamble sending module 12 is connected to the first receiving module 11, and the first preamble sending module 12 generates and sends the first message to the base station according to the system message response configuration, so as to receive the second message fed back by the base station.
Specifically, in order to achieve a better receiving effect on the second message, in this embodiment, the first receiving module 11 receives, on the SIB1, the system message response configuration periodically broadcast by the base station, so that the first preamble sending module can generate the first message by reading the system message response configuration and selecting the corresponding preamble, and receive, after sending the first message to the base station, the second message fed back by the base station.
In one embodiment, as shown in fig. 8, the determining module 2 includes: a sub-header extracting module 21, wherein the sub-header extracting module 21 extracts sub-headers of all pdus from the second message; the sub-header judging module 22, the sub-header judging module 22 judges whether the external user equipment exists according to the random access preamble in the sub-header; and an output selection module 23, wherein the output selection module 23 is connected to the sub-header judgment module 22, and the output selection module 23 selects the first system message window generation module 3 or the second system message window generation module 4 according to the output result of the sub-header judgment module.
Specifically, for the problem that in the prior art, when receiving a system message in a non-broadcast mode, user equipment needs to send a first message containing a preamble to obtain a corresponding system message window, and when there are multiple system messages that need to be received, the user equipment needs to repeatedly send the first message to obtain the receiving window position of each system message, which takes a long time, in this embodiment, after sending the first message to a base station and obtaining the second message, a sub-header extraction module 21 is used to extract a sub-header of a protocol data unit in the second message, so as to obtain multiple sub-headers. Subsequently, the sub-header determining module 22 is adopted to determine whether there is an external user equipment that has sent the first message and requested the corresponding system message by reading the random access preamble in the sub-header, so as to implement detection of the external user equipment, and further enable the output selecting module 23 to select a system message window for acquiring the system message requested by the external user equipment according to the detection result, or to send the first message to request the system message window by itself.
In one embodiment, the first system message window generating module 3 includes: the index extraction module 31, the index extraction module 31 extracts a plurality of random access preamble indexes from the second message; a system message window discrimination module 32, wherein the system message window discrimination module 32 is connected with the index extraction module 31, and the system message window discrimination module 32 judges a system message window requested by the external user equipment according to the random access lead code and the random access lead code index; and the first position generating module 33, the first position generating module 33 is connected to the system message window judging module 32, and the first position generating module 33 judges the initial position of the system message window as the initial position of the system message window according to the second message and the pre-received public parameter.
Specifically, aiming at the problem that in the prior art, when receiving a system message in a non-broadcast mode, user equipment needs to send a first message containing a preamble to obtain a corresponding system message window, and when a plurality of system messages needing to be received exist, the first message needs to be repeatedly sent to obtain the receiving window position of each system message, which takes a long time.
In one embodiment, the second system message window generating module 4 comprises: the second preamble sending module 41, the second preamble sending module 41 selects a preamble corresponding to the system message according to the system response configuration, and sends the first message to the base station according to the preamble; a second receiving module 42, where the second receiving module 42 receives a second message fed back by the base station; and a second position generating module 43, where the second position generating module 43 is connected to the second receiving module 42, and the second position generating module 43 acquires the starting position of the system message window according to the pre-received common parameter.
Specifically, in order to implement receiving of the system message, in this embodiment, when it is determined that the external user equipment does not initiate a request of a certain system message to the base station, the second preamble sending module 41 determines a preamble of the system message to be requested by searching for a system response configuration, sends the first message according to the preamble, and requests the system message to the base station, and receives the second message fed back by the base station by using the second receiving module 42, thereby implementing a request process of a system message window of the system message, so as to finally obtain a starting position of the system message window by using the second position generating module 43.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for receiving system messages under a non-broadcast mode is characterized in that the method is suitable for user equipment to obtain the system messages under the non-broadcast mode, and the method for receiving the system messages comprises the following steps: step S1: receiving a second message sent by the base station; step S2: judging whether other external user equipment which requests the system message from the base station exists or not according to the second message; if yes, acquiring a system message window initial position of the system message, and then turning to the step S4; if not, turning to the step S3; and step S3: sending a first message to the base station to request the system message from the base station and generate the starting position of the system message window; and step S4: and receiving the system message at the starting position of the system message window.
2. The method for receiving system messages according to claim 1, wherein the step S1 comprises: step S11: receiving system message response configuration sent by the base station; step S12: and generating and sending the first message to the base station according to the system message response configuration so as to receive the second message fed back by the base station.
3. The method for receiving system messages according to claim 1, wherein the step S2 comprises: step S21: extracting sub-headers of all protocol data units from the second message; step S22: judging whether the external user equipment exists according to a random access lead code in the sub-header; if yes, obtaining the initial position of the system message window, and then turning to the step S4; if not, the step is switched to the step S3.
4. The method for receiving system messages according to claim 3, wherein in step S22, the method for obtaining the starting position of the system message window includes: step A1: extracting a plurality of random access preamble indexes from the second message; step A2: judging a system message window of the system message requested by the external user equipment according to the random access lead code and the random access lead code index; step A3: and generating the starting position of the system message window as the starting position of the system message window.
5. The method for receiving system messages according to claim 2, wherein the step S3 comprises: step S31: selecting a lead code corresponding to the system message according to the system response configuration, and sending the first message to the base station according to the lead code; step S32: receiving the second message fed back by the base station; step S33: and generating the starting position of the system message window.
6. A system message receiving system in a non-broadcast mode, for implementing the system message receiving method according to any one of claims 1 to 5, comprising: a message receiving module, which receives a second message of the base station; the judging module is connected with the message receiving module and judges whether other external user equipment requesting the system message from the base station exists or not according to the second message; the first system message window generating module is connected with the judging module and acquires the initial position of a system message window of the system message; a second system message window generating module, connected to the judging module, for sending the first message to the base station to request the base station for the system message and generating the initial position of the system message window; and the system message receiving module is respectively connected with the first system message window generating module and the second system message window generating module and receives the system message at the initial position of the system message window.
7. The system message receiving system of claim 6, wherein the message receiving module comprises: a first receiving module, configured to receive a system message response configuration sent by the base station; the first preamble sending module is connected to the first receiving module, and the first preamble sending module generates and sends the first message to the base station according to the system message response configuration to receive the second message fed back by the base station.
8. The system message receiving system of claim 6, wherein the discrimination module comprises: a sub-header extraction module that extracts sub-headers of all protocol data units from the second message; the sub-header judging module judges whether the external user equipment exists according to a random access lead code in the sub-header; and the output selection module is connected with the sub-header judgment module and selects the first system message window generation module or the second system message window generation module according to the output result of the sub-header judgment module.
9. The system message receiving system of claim 8, wherein the first system message window generating module comprises: the index extraction module extracts a plurality of random access preamble indexes from the system message response configuration; a system message window judging module, connected to the index extracting module, for judging the system message window of the system message requested by the external user equipment according to the random access preamble and the random access preamble index; and the first position generation module is connected with the system message window judgment module and judges the initial position of the system message window as the initial position of the system message window.
10. The system message receiving system of claim 8, wherein the second system message window generating module comprises: a second preamble sending module, configured to select a preamble corresponding to the system message according to the system response configuration, and send the first message to the base station according to the preamble; a second receiving module, configured to receive the second message fed back by the base station; and the second position generation module is connected with the second receiving module and generates the initial position of the system message window.
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