CN109450522B

CN109450522B - MES alarm paging method based on satellite communication

Info

Publication number: CN109450522B
Application number: CN201811551587.XA
Authority: CN
Inventors: 任环; 高建贞
Original assignee: Nanjing Panda Electronics Co Ltd; Nanjing Panda Communication Technology Co Ltd
Current assignee: Nanjing Panda Electronics Co Ltd; Nanjing Panda Communication Technology Co Ltd
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2021-04-13
Anticipated expiration: 2038-12-18
Also published as: CN109450522A

Abstract

This invention puts forward an MES alarm paging method based on satellite communication, which adds a CRM module and an SPU module in an original gateway station to form an alarm paging system with the original station, when it is unsuccessful to page the MES normally due to the MES being in an unfavorable position or a down channel encountering severe mask fading, the system can send BACH alarm paging message to a called terminal via the station to make the terminal be paged even if the signal is very weak or the S/N ratio is very low so that the terminal can adjust its state timely to page normally to get the network again.

Description

MES alarm paging method based on satellite communication

Technical Field

The invention relates to the technical field of satellite communication, in particular to an alarm paging method based on satellite communication.

Background

The satellite telephone dialing is that the terminal initiates a network access flow to a gateway station through a satellite when signals are normal, the terminal starts to make a call normally after the network access is successful, and the terminal cannot be paged when the signals are weak or when an MES cannot demodulate the current and adjacent beam normal paging channels.

Aiming at the situation, the invention provides the function of alarm paging to enable the gateway station to page the terminal through the alarm channel, and the terminal can adjust the self state in time after receiving the alarm paging, if the shielding is abandoned, the signal-to-noise ratio is improved, and the terminal can be paged normally in time.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to solve the problem that normal paging of an MES is unsuccessful when the MES is in an unfavorable position or a downlink channel suffers from severe shadowing fading, and provides a method for paging the MES in satellite communication, so that a terminal can be paged under the condition of weak signals or low signal-to-noise ratio.

The technical scheme is as follows: in order to achieve the purpose, the technical scheme provided by the invention is as follows:

an MES alarm paging method based on satellite communication comprises the following steps:

(1) an alarm paging system is set up: a CRM module and an SPU module are deployed in a gateway station resource management system; the CRM module is used for monitoring and managing hardware resources in the gateway station, configuring corresponding hardware resources according to wireless resources distributed by an upper layer, completing establishment of a corresponding link and reporting resource information to the SPU module periodically; in the process of deleting the link, releasing the corresponding link according to the upper layer indication, and recovering all hardware information corresponding to the link; the SPU module is used for constructing a BACH signaling message and sending the BACH signaling message to a terminal to be paged;

(2) the SPU module is started, reads the BACH configuration file, receives resource information sent by the CRM module, and sends a beam establishment request message to the CRM according to the resource information, wherein parameters of new beams to be configured are recorded in the beam establishment request message; the CRM module calls corresponding resources according to the beam establishing request message and establishes a new beam, wherein the new beam is used for sending a BACH alarm paging message;

(3) the gateway station broadcasts the established new beam channel information;

(4) the calling terminal A accesses the network, at the moment, the calling terminal A applies for a link establishment request of the calling terminal A to the CRM module, the CRM module configures a link between the calling terminal A and the gateway station according to the link establishment request, and the calling terminal A obtains and stores a temporary TMSI (temporary multimedia information) number allocated to the calling terminal A by the gateway station;

(5) the called terminal B accesses the network, at the moment, the called terminal B sends a called terminal B link establishment request to the CRM module, the CRM module configures a link between the called terminal B and the gateway station according to the link establishment request, and the called terminal B obtains and stores a temporary TMSI (temporary Mobile subscriber identity) number which is allocated to the called terminal B by the gateway station;

(6) setting a calling threshold value N, wherein N is a positive integer; in the process of the conversation between the calling terminal A and the called terminal B, if the gateway station cannot normally page the called terminal B for N times, the SPU module sends out an alarm paging message through the FP data channel of the calling terminal A, and the BACH alarm paging message is sent out to the called terminal B through the wave beam established in the step (2);

(7) the called terminal B judges whether the alarm paging message is for the self paging according to the TMSI number obtained from the gateway station when the called terminal B accesses the network, if the TMSI number carried in the BACH alarm paging message is the TMSI number value stored when the called terminal B accesses the network, the called terminal B analyzes and processes the message, and then the message is discarded;

(8) after the terminal B processes the alarm paging message, the terminal A calls the terminal B successfully, and the terminal A and the terminal B talk with each other;

(9) when the conversation between the terminal A and the terminal B is finished, the gateway station releases wireless resources and hardware resources applied by the terminal A and the terminal B, the SPU module sends a beam deletion request to the CPM module, the CPM module deletes the beam and then feeds back a beam deletion response to the SPU module, and the gateway station releases the beam resources.

Further, the content recorded in the BACH alarm paging message includes: message type, message length, beam ID, frame number ID, terminal user ID, TMSI number.

Further, there are two sending channels for sending BACH alarm paging messages: BCCH and CCCH; the two transmission channels are selected by the following method:

if the IMSI number of the terminal B is the IMSI, calculating IMSI% 2, wherein the% represents the modulo calculation, and if the IMSI% 2 is 0, the gateway station sends a BACH alarm paging message in a BCCH channel; if the IMSIB%2 is 1, the gateway station sends an alarm paging message on a CCCH (common control channel);

the terminal B selects a channel for receiving the BACH alarm paging message by adopting the same method as the gateway station.

Has the advantages that: compared with the prior art, the invention has the following advantages:

the invention can enable the terminal to be paged under the condition of very weak signal or very low signal-to-noise ratio, and the terminal can adjust the state thereof in time according to the alarm paging and re-access the network.

Drawings

FIG. 1 is a flow chart of the present invention;

fig. 2 is a system architecture diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

First, technical terms to be used in the present invention are described:

1. TDMA frame number: the TDMA frames are numbered with frame numbers FN incremented by 1 at the end of each TDMA, and the frame numbers FN are counted cyclically in the range of 0-FN _ MAX (16 × 4 × 4896) -1 ═ 313343. 0-FN _ MAX is referred to as an ultra high frame for a complete TDMA frame number period. One superframe consists of 64 TDMA frames, and one superframe is 3.84 seconds. The superframe value is always FN mod 64. Each TDMA frame is divided into 40 time slots with a period of 60ms, one slot being 1.5 ms.

2. System message relative frame number SIRFN: the system design staggers the broadcast message transmission of each point beam in time, and the system message cycle period of each point beam defines a frame offset (SA _ SIRFN _ DELAY, with a value in the range of 0-15) relative to the superframe, which represents the SA _ SIRFN _ DELAY TDMA frame offset from the superframe boundary. The time slots used by the system message cyclic sequence logical channel can be represented by SIRFN and PCRTN, i.e., (SIRFN, PCRTN). If a burst occupies several time slots, its position can be defined by three parameters (SIRFN, PCRTN, LOBITS), (SIRFN, PCRTN) defining the position of the first time slot of the burst, LOBITS indicating the number of time slots occupied by the burst. For example, (1, 0, 2) indicates two slots of (1, 0) + (1, 1).

3. Access network signaling processing unit SPU: and the terminal is responsible for constructing the BACH message and sending the BACH message to the terminal.

4. Logical channel mapping on BCCH/CCCH: there are 3 types of logical channel mapping on BCCH/CCCH:

4.1, fixed reserved time slot logical channel: the logical channels are always sent at fixed positions relative to the cycle period of the system messages, and the logical channels adopting the fixed reserved time slots comprise FCCH, CICH and BCCH.

4.2, optional reserved slot logical channel: the logical channel is configured according to the system parameters on the BCCH, and is sent by fixedly occupying the optional reserved time slot within the validity period of the configuration parameters. Note that: these reserved time slots are not required to always transmit bursts, but only when the logical channel has information to transmit. Such logical channels are PCH and BACH.

4.3, slot-unrestricted logical channel: any unused frames on the PC10d channel may be randomly occupied. The logical channel has an AGCH.

5. Fixed reserved time slot logical channel

5.1、FCCH

There are 8 FCCH bursts per system message cycle period, and their locations are described by (SIRFN, PCRTN, LOBITS) as: (0,0,5),(8,0,5),(16,0,5),(24,0,5),(32,0,5),(40,5,5),(48,0,5),(56,0,5)

5.2、CICH

Each system message cycle period has 8 CICH bursts, and the positions thereof are described by (SIRFN, PCRTN, LOBITS) as: (0,5,5),(8,5,5),(16,5,5),(24,5,5),(32,5,5),(40,5,5),(48,5,5),(56,5,5)

5.3、BCCH

Each system message cycle has 8 BCCH bursts whose positions are described by (SIRFN, PCRTN, LOBITS) as: (2,0, 10),(18,0, 10),(34,0, 10),(50,0, 10),(10,0, 10),(26,0, 10),(42,0, 10),(58,0, 10)

6. Optional reserved time slot logical channel

The logic channels comprise PCH and BACH, the PCH and the BACH are only sent when information needs to be sent, and the system divides the PCH into two groups: PCH0 and PCH 1; BACHs were divided into 5 groups: BACH0, BACH1, BACH2, BACH3, BACH 4.

7. Computing resource management module CRM

The CRM module (compute resource management module) mainly performs management of global hardware resources and monitoring and management of states of all hardware boards. In the processes of cell establishment, common control channel establishment, broadcast channel establishment, and the like, corresponding hardware resources are allocated according to wireless resources allocated by an upper layer, so that the configuration of related hardware equipment is completed, and the establishment of a corresponding link is completed; in the process of deleting the link correlation, releasing the corresponding link according to the upper layer indication, and recycling all hardware information corresponding to the link.

The invention aims to solve the problem that normal paging of an MES is unsuccessful when the MES is in an unfavorable position or a downlink channel suffers from severe shadowing fading, and in order to solve the technical problem, the invention adopts the flow shown in figure 1:

(1) an alarm paging system is set up: a CRM module and an SPU module are deployed in a gateway station resource management system; the CRM module is used for monitoring and managing hardware resources in the gateway station, configuring corresponding hardware resources according to wireless resources distributed by an upper layer, completing establishment of a corresponding link and reporting resource information to the SPU module periodically; in the process of deleting the link, releasing the corresponding link according to the upper layer indication, and recovering all hardware information corresponding to the link; the SPU module is used for constructing a BACH signaling message and sending the BACH signaling message to a terminal to be paged; a diagram of the communication architecture between a gateway station and a terminal is shown in figure 2.

(6) setting a calling threshold value N, wherein N is a positive integer; in the process of the conversation between the calling terminal A and the called terminal B, if the gateway station cannot normally page the called terminal B for N times, the SPU module sends out an alarm paging message through the FP data channel of the calling terminal A, and the BACH alarm paging message is sent out to the called terminal B through the wave beam established in the step (2); the content recorded in the BACH alarm paging message comprises: message type, message length, beam ID, frame number ID, terminal user ID, TMSI number;

(9) when the conversation between the terminal A and the terminal B is finished, the gateway station releases wireless resources and hardware resources applied by the terminal A and the terminal B, the SPU module sends a beam deletion request to the CRM module, the CRM module deletes beams and feeds back beam deletion responses to the SPU module, and the gateway station releases beam resources.

In the above scheme, there are 5 groups for BACH alarm paging, which are respectively: BACH0, BACH1, BACH2, BACH3, BACH 4. The group in which the SPU module sends the BACH alarm page is determined by the IMSI number of the terminal and the BACH configuration file of the SPU module of the gateway station. IMSI: the International Mobile Subscriber Identification Number is a mark for distinguishing the Mobile Subscriber, is stored in the SIM card and can be used for distinguishing the effective information of the Mobile Subscriber. BACH profile of gateway station SPU module: which of five BACHs of BACHO-BACH 4 are allocated are represented by 00001-11111, two BACH groups of BACH0 and BACH2 are allocated as 00101, and 11111 represents five BACH groups of BACHO-BACH 4 are allocated.

The transmission channels of the BACH are two: the channel on which the gateway station sends the BACH depends on the IMSI number of the terminal, e.g., 281% 2 of terminals with IMSI being 1, and the BACH is run on CCCH; terminal 278% 2 with IMSI 278 is 0 running BACH on BCCH. The gateway station and the terminal adopt the same algorithm to calculate the transmission channel of the BACH.

When terminal B receives alarm paging of gateway station, the BACH alarm paging has 5 groups, and the group receiving BACH by terminal at each time is determined according to IMSI number and BACH configuration condition of SPU module of gateway station.

For example, if the terminal IMSI is 281, the BACH is 00101, indicating that BACH0 and BACH2 are configured, and 281% 2 is 1, indicating that the terminal receives BACH 2; for example, if the terminal IMSI is 281, the BACH is configured to 11111, which indicates that BACH0, BACH1, BACH2, BACH3, and BACH4 are configured, 381% 5 is 1, which indicates that the terminal receives BACH 1; for example, if the terminal IMSI is 278, the BACH is 11111, which indicates that BACH0, BACH1, BACH2, BACH3, and BACH4 are arranged, 278% 5 is 3, which indicates that the terminal receives BACH 3. And the gateway station and the terminal adopt the same algorithm to calculate which BACH group is sent and which BACH group is received. And after the terminal receives the BACH message and successfully explains the BACH message, the terminal adjusts the self state and then accesses the network again.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims

1. An MES alarm paging method based on satellite communication is characterized by comprising the following steps:

(1) an alarm paging system is set up: a CRM module and an SPU module are deployed in a gateway station resource management system; the CRM module is used for monitoring and managing hardware resources in the gateway station, configuring corresponding hardware resources according to wireless resources distributed by the gateway station, completing establishment of corresponding links and reporting resource information to the SPU module regularly; in the process of deleting the link, releasing the corresponding link according to the indication of the gateway station, and recovering all hardware information corresponding to the link; the SPU module is used for constructing a BACH signaling message and sending the BACH signaling message to a terminal to be paged;

2. The MES alarm paging method according to claim 1, wherein the BACH alarm paging message comprises: message type, message length, beam ID, frame number ID, terminal user ID, TMSI number.

3. The MES alarm paging method based on satellite communication according to claim 2, wherein there are two transmission channels for transmitting BACH alarm paging message: BCCH and CCCH; the two transmission channels are selected by the following method:

recording the IMSI number of the terminal B as an IMSI, calculating IMSI% 2, wherein the% represents the mode calculation, and if the IMSI% 2=0, the gateway station sends a BACH alarm paging message in a BCCH channel; if IMSIB%2=1, the gateway station sends BACH alarm paging message on CCCH channel;