CN101674648B - Periodic location update method of satellite mobile communication network, system and mobile terminal - Google Patents

Abstract

The invention discloses a method for periodic position update in a satellite mobile communication network, a satellite mobile communication system and a mobile terminal. The method includes: determining the duration of periodic location update of the mobile terminal according to the location information of the mobile terminal; and the mobile terminal initiates location update with the duration of the periodic location update as a period. The present invention also provides a method for periodic location update in a satellite mobile communication network, a satellite mobile communication system, and a mobile terminal, which can adaptively determine the duration of a periodic location update timer according to the location information of the mobile terminal, thereby saving resources and improving search time. Breathing efficiency, good adaptability.

Description

Method, system and mobile terminal for periodic position update of satellite mobile communication network

technical field

The invention relates to the technical field of satellite communication, in particular to a method for periodic position update in a satellite mobile communication network, a satellite mobile communication system and a mobile terminal.

Background technique

Future mobile communication systems need to support high-speed transmission under high mobility and have wider service coverage. This requires not only the adoption of advanced transmission technologies, but also the support of new network architectures. In the future mobile communication system, GEO (Geostationary) satellites can provide wider coverage and will be a powerful supplement to the ground mobile network. Compared with terrestrial mobile communication networks, GEO satellites are more suitable for providing stable wide-area communication coverage. GEO satellites can cover places that cannot be reached by ground networks such as sea areas, airspace, and remote areas with complex terrain, truly realizing seamless coverage of mobile communications.

In the mobile communication network, in order to improve the paging efficiency, the function of initiating location update is set in the mobile terminal to ensure that the mobile network can know that the mobile terminal is still in network coverage. The location update in the prior art includes mobile terminal power on/off registration, normal location update and periodic location update. Among them, periodic location update means that the mobile terminal periodically initiates location update in the same paging area, notifies the network of its status and notifies the network that it is still in the current paging area of the network. For periodic location updates, it is necessary to reasonably set the duration of the periodic location update timer according to the actual network conditions, which not only prevents the timer from being too small, resulting in frequent location updates and network congestion, but also prevents the timer from being too long. As a result, the network loses track of the mobile terminal, which increases the number of invalid paging and reduces the success rate of paging.

In the existing terrestrial mobile communication system, in a single paging area, the duration of a single periodic location update timer is used; in different paging areas, different values are used according to the different signal coverage conditions in the paging area . For areas with better signal coverage, such as cities, the period of the periodic location update timer can be longer, 60 minutes or longer; while in suburban areas, or areas with poor signal coverage in the wild, the timer's The duration should be shorter, 30 minutes or less.

In the GEO satellite mobile communication system, wireless signal coverage has new characteristics. The periodic location update method in the existing terrestrial mobile communication system cannot meet the needs of periodic location update of mobile terminals in the GEO satellite mobile communication system. Paging efficiency Low, and may cause a large amount of network resources to be occupied.

Contents of the invention

A technical problem to be solved by the present invention is to provide a method suitable for GEO satellite mobile communication network to initiate periodic location update, which can avoid resource waste and improve paging efficiency.

The present invention provides a method suitable for periodic location update of a satellite mobile communication network. The satellite mobile communication network adopts multi-beam coverage technology, and a single beam covers a paging area of the satellite mobile communication network. The single beam coverage constitutes a paging area of the satellite mobile communication network. There are different types of location areas with different signal coverage characteristics in a paging area under beam coverage; the method includes: the mobile terminal obtains its location area type information; The duration of the periodic location update timer is determined in the next periodic location update timer duration list; wherein, the periodic location update timer duration list under the satellite single beam includes location area type information and the periodic location update timing The corresponding relationship between the duration of the timer; the mobile terminal initiates a location update with the duration of the periodic location update timer as a period.

According to an embodiment of the method for periodic location update of the present invention, the obtaining of the location area type information by the mobile terminal includes: obtaining the location of the mobile terminal by the satellite network; The location area type information of the mobile terminal is determined in the location area type list; the satellite network sends the location area type information of the mobile terminal to the mobile terminal; wherein the location area type list includes the location of the mobile terminal Correspondence with location area type information.

The present invention also provides a satellite mobile communication system, including a satellite network and a mobile terminal. The satellite network adopts multi-beam coverage technology, and a single beam coverage constitutes a paging area of the satellite network. A paging area under the coverage of the single beam There are different types of location areas with different signal coverage characteristics in the paging area; the satellite network is configured to determine the location area type information of the mobile terminal according to the location information of the mobile terminal, and send the mobile terminal the location area type information; the mobile terminal is configured to receive the location area type information, and determine the duration of the periodic location update timer from the periodic location update timer duration list under a satellite single beam according to the location area type information ; Wherein, the periodic location update timer duration list under the satellite single beam includes the corresponding relationship between the location area type information and the duration of the periodic location update timer; the period is the period of the periodic location update timer Initiate a location update.

According to an embodiment of the satellite mobile communication system of the present invention, the corresponding relationship between location information and location area type information is stored in the network elements of the satellite network; The location area type information of the mobile terminal is determined in the corresponding relationship between the location information and the location area type information; the corresponding relationship between the location area type information and the periodic location update timer duration is stored in the mobile terminal; The location area type information determines the duration of the periodic location update timer from the correspondence between the location area type information and the duration of the periodic location update timer.

The present invention also provides a mobile terminal, which is located under the coverage of a satellite mobile communication network. The satellite mobile communication network adopts multi-beam coverage technology, and a single beam coverage constitutes a paging area of the satellite mobile communication network. The single beam There are different types of location areas with different signal coverage characteristics in a paging area under coverage; the mobile terminal includes: a location area type acquisition unit for acquiring location area type information of the mobile terminal; a location update duration determination unit, It is used to determine the duration of the periodic location update timer of the mobile terminal from the periodic location update timer duration list under the satellite single beam according to the location area type information acquired by the location area type acquisition unit; wherein, the The periodic location update timer duration list under the satellite single beam includes the corresponding relationship between the location area type information and the duration of the periodic location update timer; the location update initiation unit is used to determine the location update duration determination unit The duration is the periodic location update.

The method, mobile satellite communication system and mobile terminal applicable to the GEO satellite mobile communication network of the present invention initiate periodic position update, aiming at the coverage characteristics of the GEO satellite mobile communication network, and adaptively initiating periodic position update according to the position information of the mobile terminal , can effectively improve the paging success rate of the GEO satellite mobile communication network, and reduce the waste of resources.

Description of drawings

Fig. 1 shows the GEO satellite mobile communication system architecture schematic diagram of the present invention;

Fig. 2 shows the flowchart of an embodiment of the method for initiating periodic position update in the GEO satellite mobile communication network of the present invention;

Fig. 3 shows the flow chart of another embodiment of the method for initiating periodic location update in the GEO satellite mobile communication network of the present invention;

Fig. 4 shows the storage implementation of various information in one embodiment of the present invention;

Fig. 5 shows the block diagram of an embodiment of the satellite mobile communication system of the present invention;

Fig. 6 shows a block diagram of an embodiment of the mobile terminal of the present invention.

Detailed ways

The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

In the GEO satellite mobile communication system, wireless signal coverage has the following new features:

Feature 1: Under the coverage of GEO satellites, the signal coverage characteristics of different types of areas are different from those of the ground network. GEO satellites operate in a circular orbit 36,000 km above the ground in the equatorial plane. For ground mobile terminals, the GEO satellite signals received by them will be affected by ground shadows. For areas with more ground shelters, GEO satellite signal shadow fading is more obvious, and the signal quality received by mobile terminals is poor. In the terrestrial mobile communication system, the wireless signal coverage in the city is the best, so the timer duration of the periodic location update can be longer to reduce the increase of the network load caused by the location update; Insufficient coverage, a smaller periodic location update timer is often used to prevent the network from losing track of the mobile terminal and reduce the number of invalid paging initiated by the network. In the GEO satellite mobile communication system, compared with open areas, the quality of GEO satellite signals received by mobile terminals in urban areas will suffer from more serious fading due to the influence of ground buildings. Therefore, in the GEO satellite mobile communication system, in areas with many shelters such as cities and forests, the timer interval for periodic location updates of mobile terminals should be set relatively small, while the timer duration for open areas such as villages and fields can be set accordingly. The settings are larger.

Feature 2: Large coverage of GEO satellites. In the GEO satellite mobile communication network, the technology of multi-beam coverage is adopted, and the beam is the smallest unit covered by the GEO satellite, which constitutes a paging area of the GEO satellite mobile network. The coverage radius of a single beam is between hundreds and thousands of kilometers, and its coverage is much larger than the possible coverage of a single paging area of a terrestrial mobile communication network. Compared with the latter, the single paging area is an area with relatively single signal coverage characteristics. In the GEO satellite mobile communication system, a single beam coverage may include multiple types of areas with different signal coverage characteristics. For example, a single beam It can cover cities, villages, forests, lakes, etc. at the same time. Therefore, in the terrestrial mobile communication system, a single periodic location update timer is used in a single paging area. In the GEO satellite mobile communication system, it will not be able to meet the periodic location of mobile terminals located in different types of areas covered by the same beam. Update needs.

As shown in FIG. 1 , FIG. 1 is an architecture diagram of a GEO satellite mobile communication system according to an embodiment of the present invention. In an embodiment, the GEO satellite mobile communication system includes a mobile terminal and a satellite mobile communication network (or called a satellite network).

Under the multi-beam coverage of the GEO satellite mobile communication system, there are many different types of location areas under the coverage of a single beam. The satellite mobile communication network can adopt the UMTS (R4) network architecture similar to the terrestrial mobile communication network, or the network architecture similar to the cellular mobile communication network, such as GSM, CDMA, UMTS R5 and its subsequent versions. The satellite mobile communication system includes: a mobile terminal 11, a GEO satellite access network 12 and a core network 13, wherein the GEO satellite access network 12 includes GEO satellites and ground gateway stations, and completes the air interface access of the satellite mobile terminal to the satellite network; The core network 13 includes the ground network controller of the GEO network, which completes the operation management and business data transmission and exchange of the GEO satellite network.

Fig. 2 is a flowchart of an embodiment of the method for periodically updating the location of a mobile terminal in a GEO satellite mobile communication network according to the present invention.

As shown in FIG. 2, in step 202, the mobile terminal determines the duration of periodic location update according to its location information.

The mobile terminal obtains the location area type information corresponding to its location (the location area type information is represented by the location area type identifier LTI), and determines the location of the mobile terminal according to its location area type identifier (LTI) and the list of periodic location update timer durations. The duration of the periodic location update timer initiated by the satellite network.

For example, the location area type identifier (LTI) of the mobile terminal is "00", and the duration of the periodic location update timer corresponding to the location area type identifier (LTI) "00" is found from the periodic location update timer duration list as "T1", then it is determined that the duration of the periodic location update timer of the mobile terminal is "T1".

In step 204, the mobile terminal initiates a periodic location update with the duration of the periodic location update as a period.

After the mobile terminal determines the duration of the periodic location update timer (assumed to be T1), the mobile terminal sets the duration of the periodic location update timer as "T1" and starts the timer. When the timer expires, it initiates a location update to the satellite network .

If the interval of the periodic location timer determined by the mobile terminal based on the location area type changes, for example, the movement of the mobile terminal causes the location area type of the mobile terminal to change, or the network administrator modifies the periodic timer applicable to a certain type of location area. Position timer interval. In the case of interval changes due to movement of the mobile terminal, the mobile terminal sets the duration of the periodic location update timer to "T1" after determining a new periodic location timer interval, and starts the timer. For example, when the mobile terminal receives the location area type identifier (LTI) as "01" in the location update, which is different from the stored location area type identifier "00", the mobile terminal updates its stored location area type identifier (LTI) is "01", and re-determines the timer duration as "T2" from the periodic location update timer duration list, starts the periodic location update timer, and sets the duration to "T2". In the case that the timer interval is modified by the network administrator, it can be implemented according to the method for modifying the periodic location update interval in the ground communication system.

If the location area type (LTI) of the mobile terminal or the period length list of the periodic location update timer remains unchanged, the mobile terminal may continue to use the original timer duration to set the periodic location update timer.

Fig. 3 is a flow chart of another embodiment of the method for initiating periodic location update by the GEO mobile communication network of the present invention. Compared with the previous embodiment, this embodiment also includes the satellite network setting and sending the periodic location update timer duration list to the mobile terminal, the satellite network determining and sending the location area identifier (LTI) of the mobile terminal and the satellite mobile network moving There are three procedures for the terminal to store its location area type identifier (LTI).

As shown in FIG. 3 , in step 302 , a periodic location update timer duration list under a satellite single beam is set.

The network administrator of the satellite network sets the period lengths of the periodic location update timers for different types of location areas, and stores them in the period length list of the periodic location update timers.

In step 304, the satellite network sends a periodic location update timer duration list to the mobile terminal.

The satellite network sends the periodic location update timer duration list to the mobile terminal in a broadcast manner. For example, the satellite network carries a periodic location update timer duration list in a broadcast message (for example, using a "L3-RRC System Information Block1 (SIB1)" message similar to UMTS (R4)), and sends it to the mobile terminal on the broadcast channel. The broadcast method can include two types, one is polling broadcast, that is, each broadcast message contains a piece of information including a periodic location update timer duration list, that is, a location area type identifier (LTI) and its corresponding periodic location update The duration of the timer, the periodic location update timer duration list is sent to the mobile terminal in multiple broadcasts in a polling manner; the other is a single broadcast, which contains the complete periodic location update timing in the broadcast broadcast information The timer length list, that is, the duration of all location area type identifiers (LTI) and the corresponding periodic location update timers of each type.

For example, if the periodic location update timer duration list contains four pieces of information, the location area type identifier (LTI) is "00" corresponding to the timer duration "T1", and the identifier (LTI) is "01" corresponding to the timer duration "T2" , the identifier (LTI) being "10" corresponds to the timer duration "T3", and the identifier (LTI) is "11" corresponding to the timer duration "T4". In the polling broadcast mode, the satellite network will send the periodic location update timer duration list to the mobile terminal through four broadcast messages in polling mode, where the nth (n=4k+1, k=0, 1, The location area type identifier contained in the 2, 3, ...) broadcast information is "00", the timer duration is "T1", and the nth (n=4k+2, k=0, 1, 2, 3, ...) The location area type identifier contained in the broadcast information is "01", the timer duration is "T2", and the nth (n=4k+3, k=0, 1, 2, 3, ...) The location area type identifier contained in the broadcast information is "10", the timer duration is "T3", and the nth (n=4(k+1), k=0, 1, 2, 3, ...) times The location area type identifier included in the broadcast information is "11", the timer duration is "T4", and so on. In the single broadcast mode, the satellite network will include four pieces of information in the periodic location update timer duration list in one broadcast message, and send it to the mobile terminal in one broadcast mode.

In step 306, the mobile terminal receives a list of periodic location update timer durations.

The mobile terminal receives the periodic location update timer duration list sent by the satellite network by monitoring the broadcast channel of the satellite network, stores and updates its periodic location update timer duration list.

In step 308, the mobile terminal determines the duration of the periodic location update timer from the received periodic location update timer duration list according to its location area type identifier (LTI).

At step 310, the satellite network acquires the location of the mobile terminal.

The manner in which the satellite network obtains the position of the mobile terminal may be satellite network measurement, or the mobile terminal measures and informs the network. If the mobile terminal measurement method is used, the position of the mobile terminal can be obtained through independent measurement by the mobile terminal or through other testing tools.

At step 312, the satellite network determines the location area type identification (LTI) of the mobile terminal.

After the satellite network acquires the location of the mobile terminal, it determines the location area type identifier (LTI) of the mobile terminal from the location area type list according to the correspondence between the location of the mobile terminal and the location area type. The determined Location Area Type Identification (LTI) results are stored in network elements of the satellite network. Figure 1 shows the satellite network architecture, the location area type identifier (LTI) of the mobile terminal can be stored in the temporary location area register (VLR) of the satellite network.

In step 314, the mobile terminal starts a periodic location update timer, initiates location update after the timer expires, and receives and stores the location area type identifier (LTI) sent by the satellite network.

The duration of the periodic location update timer of the mobile terminal is set as T, and the timer is started to start timing. If the timer expires, a location update is initiated to the satellite network.

When the mobile terminal initiates a location update, the satellite network includes the determined location area type identifier (LTI) of the mobile terminal in the location update "determination message" and sends it to the mobile terminal, and the mobile terminal receives the mobile terminal sent by the satellite network. The location area type identifier (LTI) of the location where the terminal is located, and store or update the location area type identifier (LTI).

After the location update is completed, the mobile terminal determines the duration of the next periodic location update timer according to the received and stored new location area type identifier (LTI), and restarts the timer to start timing.

Those skilled in the art should understand that steps 302 to 308 in FIG. 3 , as configuration or update steps, do not need to maintain a fixed sequence relationship with steps 310 to 314 , but can be performed periodically, randomly or in other ways.

In the embodiment of Fig. 3, the location area type information of the mobile terminal is obtained from the location area type list by the satellite network according to the location of the mobile terminal, and then sent to the mobile terminal; A list of location area types is stored, and the mobile terminal obtains location area type information according to its own location.

Fig. 4 shows the storage implementation of various information in one embodiment of the present invention. As shown in Figure 4, include: location area type list 43, be used for storing the corresponding relation of mobile terminal position and location area type (LTI); Periodic location update timer duration list 42, be used for storing location area type (LTI) The corresponding relationship with the duration of the periodic location update timer. The satellite network stores the location area type of the mobile terminal in the VLR41, which is used by the satellite network to manage the location area type (LTI) of the mobile terminal connected to it.

Among them, the location area type list 43 adopts four types of location area types briefly divided according to different coverage conditions of satellite signals: city, mountain forest, open field, and water area; the location area type list can be stored in the temporary location of the satellite network and the core network In the database to which the register is connected. The location area type list includes a location area type, a location area type identifier (LTI) and location coordinates corresponding to the location area type.

Wherein, the periodic location update timer duration list 42 is respectively stored in the database of the satellite network connected to the core network temporary location register and the mobile terminal. The periodic location update timer duration list corresponds to the periodic location update timer duration storage subunit, including the location area type, location area type identifier (LTI) and the duration of the periodic location update timer corresponding to the location area type.

Wherein, the satellite network stores the location area type of the mobile terminal in a temporary location register (VLR) of the network. The location area type identifier (LTI) information is added to the relevant information of each mobile terminal managed by the satellite network VLR. After the satellite network acquires the location of the mobile terminal and determines the location area type of the mobile terminal from the location area type list, a location area type identifier will be added under the information item corresponding to the mobile terminal in the VLR.

Fig. 5 shows a block diagram of an embodiment of the satellite mobile communication system of the present invention. As shown in FIG. 5 , the satellite mobile communication system includes a satellite network 51 and a mobile terminal 52 . Among them, the satellite network 51 is used to determine the location area type information of the mobile terminal 52 according to the location information of the mobile terminal 52, and sends the location area type information and the periodic location update duration list to the mobile terminal 52; the mobile terminal 52 is used to receive the location area type information. The area type information determines the duration of the periodic location update timer according to the location area type information; initiates location update with the determined duration of the periodic location update timer as a period.

According to one embodiment of the satellite mobile communication system of the present invention, in the network element of satellite network 51, the corresponding relationship between position information and location area type information is stored; The location area type information of the mobile terminal 52 is determined in the corresponding relationship of the type information; the network element of the satellite network 51 can store the corresponding relationship between the location area type information set by the network manager and the duration of the periodic location update timer; the mobile terminal 52 stores the corresponding relationship between the location area type information and the periodic location update timer duration; the mobile terminal 52 determines the periodic location from the corresponding relationship between the location area type information and the periodic location update timer duration according to the received location area type information The duration of the update timer.

According to an embodiment of the present invention, the mobile terminal 52 includes: a location area type obtaining unit 521, configured to obtain location area type information of the mobile terminal; a location update duration determining unit 522, configured to obtain the location area type information according to the location area type The obtained location area type information determines the duration of the periodic location update timer of the mobile terminal; the location update initiating unit 523 is configured to initiate location update periodically based on the duration determined by the location update duration determining unit.

Fig. 6 shows a block diagram of an embodiment of the mobile terminal of the present invention. As shown in FIG. 6 , it includes: a location area type acquisition unit 61 , a location update duration determination unit 62 and a location update initiation unit 63 .

Wherein, the location area type acquisition unit 61 includes: a mobile terminal location acquisition subunit 611 , a location area type list storage subunit 613 and a mobile terminal location area type selection subunit 612 . The location acquisition subunit 611 of the mobile terminal is used to obtain the location of the mobile terminal; the location area type list storage subunit 613 is used to store the location area type list, and the location area type list includes the location and location area type information of the mobile terminal (for example, location area type identifier (LTI)); the mobile terminal location area type selection subunit 612 is used to select the location area type information of the location where the mobile terminal is located in the originating week from the location area type list according to the location of the mobile terminal.

The location update duration determination unit 62 includes: a periodic location update timer duration storage subunit 622 and a periodic location update timer duration selection subunit 621 . The periodic location update timer duration storage subunit 622 is used to store the periodic location update timer duration list, and the duration list of the periodic location update timer includes location area type information (for example, location area type identifier (LTI)) and The corresponding relationship of the duration of the periodic location update timer. The periodic location update timer duration selection subunit 621 is configured to select a duration for initiating the periodic location update timer from the periodic location update timer duration list according to the location area type information of the mobile terminal.

The location update initiating unit 63 includes: a timing subunit 631 and a location update information sending subunit 632 . The timing subunit 631 is used for initiating timer update and counting according to the duration of the periodic location update timer; the location update information sending subunit 632 is used for when the timing of the periodic location update timer exceeds the duration of the timer, the satellite connected to the mobile terminal The network sends location update information.

Aiming at the characteristics of GEO satellite mobile communication network coverage, the present invention proposes a corresponding periodic location update method, satellite mobile communication system and mobile terminal, and initiates periodic location update adaptively according to the location information of the mobile terminal , can effectively improve the paging success rate of the GEO satellite mobile communication network, reduce resource waste, and have strong practicability.

The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention and design various embodiments with various modifications as are suited to the particular use.

Claims (12)

1. method that is applicable to the periodic location update of satellite mobile communication network, described satellite mobile communication network adopts the multi-beam antenna technology, single wave beam covers a paging domain that consists of described satellite mobile communication network, it is characterized in that, there is the dissimilar band of position of different signal Cover Characteristics in a paging domain under described single wave beam covers, and described method comprises:

Its band of position type information of acquisition for mobile terminal;

Described portable terminal determines to initiate the duration of periodical position renewing timer the periodical position renewing timer time length tabulation under the satellite simple beam according to described band of position type information;

Wherein, periodical position renewing timer time length tabulation comprises the corresponding relation of the duration of band of position type information and described periodical position renewing timer under the described satellite simple beam;

Described portable terminal upgrades take the duration of described periodical position renewing timer as the cycle launch position.

2. the method for periodic location update according to claim 1 is characterized in that,

Its band of position type information of described acquisition for mobile terminal comprises:

Satellite network obtains the position of described portable terminal;

Described satellite network is determined the band of position type information of portable terminal from the list of types of the band of position according to the position of described portable terminal;

Described satellite network sends to described portable terminal with the band of position type information of described portable terminal;

Wherein, described band of position list of types comprises the position of described portable terminal and the corresponding relation of band of position type information.

3. the method for periodic location update according to claim 2, it is characterized in that, the mode that described satellite network obtains mobile terminal locations comprises: described portable terminal measuring position also sends to satellite network, or described portable terminal measures its position and sends to satellite network by extraneous testing tool, or described satellite network is measured the position of portable terminal.

4. according to claim 2 or the method for 3 described periodic location updates, it is characterized in that, the duration list storage of periodical position renewing timer is in the network element of described satellite network under the described satellite simple beam, and described periodical position renewing timer time length tabulation sends to portable terminal by satellite network in the mode of broadcasting.

5. the method for periodic location update according to claim 1 is characterized in that, described duration take periodical position renewing timer was initiated periodic location update and comprised as the cycle:

Portable terminal determines to initiate the cycle of periodic location update according to the duration of described periodical position renewing timer;

Described portable terminal opening timing device carries out timing, if described timer timing surpasses timer duration, then described portable terminal sends location updating message to satellite network.

6. the method for periodic location update according to claim 5 is characterized in that, after described portable terminal sends location updating message to satellite network, also comprises:

The band of position type information of described this portable terminal that satellite network will be determined is included in " the determining message " that upgrades the position and sends to described portable terminal;

After the position renewal was finished, described portable terminal was determined the next time duration of periodical position renewing timer according to the new band of position type information that receives, and restarts timer and begins timing.

7. a satellite mobile communication system comprises satellite network and portable terminal, it is characterized in that,

Described satellite network adopts the multi-beam antenna technology, and single wave beam covers a paging domain that consists of described satellite network, and there is the dissimilar band of position of different signal Cover Characteristics in a paging domain under described single wave beam covers;

Described satellite network, the band of position type information for determine described portable terminal according to the positional information of described portable terminal sends described band of position type information to described portable terminal;

Described portable terminal, be used for receiving described band of position type information, under the satellite simple beam, determine the duration of periodical position renewing timer the periodical position renewing timer time length tabulation according to described band of position type information, wherein, periodical position renewing timer time length tabulation comprises the corresponding relation of the duration of band of position type information and described periodical position renewing timer under the described satellite simple beam; Upgrade take the duration of described periodical position renewing timer as the cycle launch position.

8. satellite mobile communication system according to claim 7 is characterized in that, stores the corresponding relation of positional information and band of position type information in the network element of described satellite network; Described satellite network is determined the band of position type information of described portable terminal from the corresponding relation of described positional information and band of position type information according to the positional information of described portable terminal;

The corresponding relation of memory location area type information and periodical position renewing timer time length in the described portable terminal; Described portable terminal is determined the duration of periodical position renewing timer from the corresponding relation of described band of position type information and periodical position renewing timer time length according to described band of position type information.

9. portable terminal, be positioned under the covering of satellite mobile communication network, it is characterized in that, described satellite mobile communication network adopts the multi-beam antenna technology, single wave beam covers a paging domain that consists of described satellite mobile communication network, and there is the dissimilar band of position of different signal Cover Characteristics in a paging domain under described single wave beam covers;

Described portable terminal comprises:

Band of position type acquiring unit is for the band of position type information that obtains described portable terminal;

The position updating time length determining unit is used for the duration that the periodical position renewing timer of described portable terminal is determined in the periodical position renewing timer time length tabulation under the satellite simple beam of the described band of position type information that obtains according to described band of position type acquiring unit; Wherein, periodical position renewing timer time length tabulation comprises the corresponding relation of the duration of band of position type information and described periodical position renewing timer under the described satellite simple beam;

The position is upgraded and is initiated the unit, is cycle launch position renewal for the duration of determining take described position updating time length determining unit.

10. portable terminal according to claim 9 is characterized in that, described position updating time length determining unit comprises:

The periodical position renewing timer time length storing sub-units is used for storing periodical position renewing timer time length tabulation under the described satellite simple beam;

Periodical position renewing timer time length chooser unit, be used for described portable terminal according to its band of position type information periodical position renewing timer time length tabulation under the described satellite simple beam select to initiate the duration of periodical position renewing timer.

11. portable terminal according to claim 9 is characterized in that, described position is upgraded the initiation unit and is comprised:

The timing subelement is used for starting timer and timing according to periodical position renewing timer time length;

Location updating message sends subelement, be used for the periodical position renewing timer timing overtime after, described portable terminal sends location updating message to satellite network.

12. portable terminal according to claim 9 is characterized in that, described band of position type acquiring unit comprises:

The position acquisition subelement of portable terminal is used for the position that obtains portable terminal;

Band of position list of types storing sub-units is used for memory location area type tabulation, and described band of position list of types comprises the corresponding relation of mobile terminal locations and band of position type information;

Location area type identification chooser unit is used for satellite network selects to initiate all portable terminals present position from band of position list of types according to the position of described portable terminal band of position type information.

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