CN107769840B - PS service resource active recovery method of hybrid exchange type satellite communication system - Google Patents

PS service resource active recovery method of hybrid exchange type satellite communication system Download PDF

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CN107769840B
CN107769840B CN201710969752.2A CN201710969752A CN107769840B CN 107769840 B CN107769840 B CN 107769840B CN 201710969752 A CN201710969752 A CN 201710969752A CN 107769840 B CN107769840 B CN 107769840B
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service
resource
wireless
satellite
resources
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CN107769840A (en
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朱俊
陆锐敏
关涛
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Defense Technology Of Pla 63rd Institute, National University of
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources

Abstract

The invention relates to a PS business resource active recovery method of a hybrid switching type satellite communication system, which comprises a PS business wireless resource allocation process and a wireless resource recovery process; a user terminal initiates a PS service transmission request to a satellite-borne network control center through a network control channel; after the request response, acquiring corresponding wireless resources, establishing a data transmission channel between the user terminal and the satellite, and transmitting PS service data on the channel; the network control center monitors the use condition of all the allocated PS service wireless resources in real time, and if the non-use time of the resources exceeds a certain time limit, the network control center performs recovery operation on the part of wireless resources and simultaneously notifies the corresponding terminal user of the resource recovery operation. The invention improves the utilization efficiency of the satellite wireless resources and improves the flexibility of dynamic resource management of the hybrid exchange type satellite communication system by actively recovering the idle PS service wireless resources with lower utilization rate.

Description

PS service resource active recovery method of hybrid exchange type satellite communication system
Technical Field
The invention belongs to the technical field of communication, and particularly relates to an active PS service resource recovery method of a hybrid switching type satellite communication system.
Background
The development trend of a satellite communication system in the future is that a narrow-band system and a wide-band system gradually converge and are unified, and the satellite communication system based on hybrid switching becomes mainstream increasingly. Such a system can not only carry CS domain services such as Low Data Rate (LDR), Medium Data Rate (MDR), and High Data Rate (HDR), but also carry PS domain packet services. Therefore, in the present stage, for the hybrid switching type satellite communication system, the dynamic adjustment and usage management problem of the wireless resources of the satellite transmission services of different domains, different types and different bandwidths becomes a core technical problem.
However, in such satellite communication systems, currently, the PS service radio resource management method mainly adopts a passive management method, that is, a satellite terminal user makes a PS service communication request or a communication cancellation request, and a network control center passively receives and processes these requests. Therefore, no matter the use condition of the wireless resources allocated to the users, only after the satellite terminal users actively make PS service communication cancellation requests, the corresponding wireless resources can be recovered by the network control center and used in the subsequent communication application process. However, in terms of resource usage, there are often the following situations: after a satellite terminal user puts forward a PS service communication request and obtains a wireless resource usage right, the service communication volume is not very large, and the usage rate of allocated PS service wireless resources is low, which causes low usage efficiency of PS service wireless resources, especially in the case of large PS service communication volume of other users. To a certain extent, this mechanism is easy to cause waste of radio resource usage, and also has a certain impact on the user experience of the PS service.
Meanwhile, the existing mechanism can not solve the problem of dynamic adjustment of the share of the wireless resources of different types of services: in some cases, the PS service radio resources need to be adjusted to other types of services, but since the allocated PS service resources can be recovered by the network control center only when the satellite terminal user makes a cancellation request, the allocated PS service resources can be further adjusted to other types of radio resources. Therefore, the current resource management method cannot adapt to the problem of dynamic adjustment and conversion of the radio resource types in the hybrid switching type satellite communication system.
Disclosure of Invention
The invention aims to provide a method for actively recycling PS service resources of a hybrid switching type satellite communication system.A network control center actively recycles the PS service wireless resources with lower use efficiency by monitoring the use condition of the allocated PS service wireless resources, thereby improving the use efficiency of the satellite wireless resources on one hand and facilitating the realization of dynamic adjustment and conversion of shares of different types of wireless resources on the other hand.
The technical scheme for realizing the purpose of the invention is as follows: a PS business resources of the satellite communication system of mixed exchange type actively retrieves the method, including PS business wireless resources distribution process and wireless resources recovery process;
(1) PS service wireless resource allocation process:
a user terminal initiates a PS service transmission request to a satellite-borne network control center through a network control channel; after the request response, acquiring corresponding wireless resources, establishing a data transmission channel between the user terminal and the satellite, and transmitting PS service data on the channel;
(2) and (3) wireless resource recovery process:
the network control center monitors the use condition of all the allocated PS service wireless resources in real time, and if the non-use time of the resources exceeds a certain time limit, the network control center performs recovery operation on the part of wireless resources and simultaneously notifies the corresponding terminal user of the resource recovery operation.
Furthermore, the strategy for recovering the PS service radio resources is based on the recent usage as a basic principle, and determines whether the difference between the current time and the recent usage time of the allocated PS service radio resources exceeds a resource recovery time parameter, that is, the PS service radio resource recovery determination condition is
tc-tu>tr
Wherein, tcIs the current time, tuIs the time when a certain radio resource has been used recently, trIs a resource recovery time parameter;
if the judgment condition is satisfied, the network control center performs recovery processing on the corresponding wireless resource;
if the judgment condition is not satisfied, the network control center does not actively recover the part of resources.
Further, the PS service radio resource allocation process specifically includes:
the user terminal sends out a PS service transmission application to the satellite-borne network control center according to the PS service transmission requirement;
the satellite-borne network control center processes the PS service communication request of the terminal according to the current wireless resource distribution condition;
after the terminal communication request is granted, a satellite communication link for the PS service is established between the user terminal and the satellite, including an uplink/downlink;
the user terminal sends the PS service data to the satellite-borne router through the satellite uplink, and meanwhile receives the PS service data forwarded from the satellite-borne router through the downlink.
Further, the radio resource recycling process specifically includes:
(2-1) statistics of wireless resource usage information of PS services
2-1-1) initializing a resource usage statistical process;
2-1-2) the flow enters the process of waiting for the arrival of a new frame data transmission frame;
2-1-3) after receiving a frame data transmission frame, reading the items in the PS service wireless resource allocation table one by one, wherein each PS service user corresponds to one allocation item;
2-1-4) judging whether the radio resource allocated by the current user is used in the data transmission frame:
2-1-4a) if yes, updating the attribute parameter of the wireless resource of the user to the latest using time tu；
2-1-4b) if not, jumping to the next step;
2-1-5) judging whether the PS service wireless resource allocation table item is traversed:
2-1-5a), if yes, the resource use information is updated, and the step 2-1-2 is skipped to;
2-1-5b) if not, the updating of the resource use information is not completed, and the step 2-1-3 is skipped to read the next distribution list item.
(2-2) radio resource recovery
2-2-1) initializing a wireless resource recovery process;
2-2-2) initializing global variables: recovery period parameter tpRecovery time parameter trAnd a current time parameter tc；
2-2-3) judging whether the current moment reaches the execution time of the resource recovery process:
2-2-3a), if yes, entering a step 2-2-4;
2-2-3b) if not, continuing to wait and re-entering the step 2-2-3;
2-2-4) reading a table entry of a PS service wireless resource allocation table, wherein each PS service user has an allocation table entry;
2-2-5) judging the current time parameter tcThe latest time t of use of the radio resourceuWhether the difference exceeds the recovery timeNumber tr：
2-2-5a) if yes, actively recovering the PS service wireless resources allocated to the user, putting the wireless resources just recovered back to the unallocated resource pool for use in next allocation, and simultaneously informing the user terminal of canceling the resource application by the network control center;
2-2-5b) if not, entering a step 2-2-6;
2-2-6) judging whether the radio resource allocation table item is traversed or not:
2-2-6a), if yes, entering to wait for the next resource recovery process to arrive at the execution time, and skipping to the step 2-2-3;
2-2-6b) if not, continuing to process the next distribution table entry and jumping to the step 2-2-4.
Compared with the prior art, the invention has the following remarkable advantages:
(1) aiming at the problem that the background technology can not process the allocated PS service wireless resources which are idle for a long time, the invention improves the utilization efficiency of the satellite wireless resources by actively recovering the PS service wireless resources which are idle and have lower utilization rate;
(2) aiming at the situation that PS service communication traffic is heavy and part of allocated wireless resources are idle, the PS service wireless resources actively recovered by the method can be used for being allocated to other PS service users, and the more urgent PS service communication requirements of the part of users are met, so that the use experience of the PS service in the multi-service satellite communication system is improved;
(3) aiming at the difference of the wireless resource distribution modes of the CS service and the PS service in the prior art, the active recovery method for the wireless resources of the PS service provided by the invention is beneficial to realizing the dynamic conversion and adjustment between the wireless resources of the PS service and other types of wireless resources, and the flexibility of the dynamic resource management of a hybrid exchange type satellite communication system is improved.
Drawings
Fig. 1 is a diagram illustrating a typical usage of PS service radio resources.
Fig. 2 is a diagram illustrating an effect of the radio resource recycling method according to the present invention.
FIG. 3 is a block diagram of the system of the present invention.
Fig. 4 is a flow chart of radio resource usage information statistics according to the present invention.
Fig. 5 is a radio resource recycling flowchart according to the present invention.
Detailed Description
The invention mainly aims at satellite wireless resources such as PS service frame time slots.
The active PS service resource recovery method of the hybrid exchange type satellite communication system can be applied to the PS service wireless resource management process of the hybrid exchange type satellite communication system. Such systems possess the following main features: carrying a plurality of communication service types including PS service; the communication carrying capacity between different service types can be dynamically allocated. Specifically, there is one of the following cases:
(1) the satellite communication system bears various communication services with different bandwidths and different domains, namely the satellite communication system needs to support not only PS domain services but also various circuit domain services such as LDR, MDR and HDR;
(2) the allocable wireless resource share of different service types in the satellite communication system is flexible and allocable-the wireless resource share of some service types needs to be adjusted to other types of services;
(3) the method improves the utilization efficiency of the PS service wireless resources in the hybrid switching type satellite communication system, actively recovers the wireless resources of the PS service users with less communication traffic, and distributes the recovered wireless resources to the more important PS service users.
The following five typical radio resource usage cases occur for PS traffic transmission:
(1) the PS service flow is large: the radio resources are frequently used, run almost at full load, use all allocated bandwidths, and each allocated timeslot occupies at each moment, such as user 1 in fig. 1;
(2) PS traffic is medium: the radio resources are frequently used, but the traffic is more uniform and less than the bandwidth, the allocated time slot is not full, but there is a packet data packet at each time, such as user 5 in fig. 1;
(3) PS traffic is medium: the radio resource usage frequency is low, but the traffic is in a state of large change, large fluctuation, much time and little time, such as user 2 in fig. 1;
(4) the PS service flow is less: the frequency of use is low, but occasionally there are packets of data, such as user 4 in fig. 1;
(5) PS service traffic is almost zero: the allocated radio resources are used only rarely, as in user 3 in fig. 1, which is the main resource recovery object to which the present invention relates.
As shown in fig. 2, the PS service radio resource recycling method has the following effects: from time ti→tmAfter going through a resource recovery process, recovering the wireless resource with the number 3; from time tm→tnAfter going through a resource recovery process, recovering the wireless resource with the number 4; from time tn→tlGo through a resource recovery process to recover the radio resource of number 5. The recovered radio resources are reallocated to new users, e.g. from time tn→tlThe radio resource of the original number 3 is reallocated to the new user of the number 8, and the radio resource of the original number 4 is partly reallocated to the new user of the number 7. Therefore, the invention overcomes the problem that part of the wireless resources are idle for a long time, which cannot be solved by the original wireless resource management method, and realizes the active recovery of the part of the wireless resources.
The technical scheme of the invention is concretely explained in the following with the accompanying drawings.
As shown in fig. 3, the active PS service radio resource recovery method mainly includes two parts, namely, a satellite and a terrestrial user terminal.
In the method, the user terminal mainly completes: initiating a PS service transmission request to a satellite-borne network control center through a network control channel; after the request response, the corresponding wireless resource is obtained, a data transmission channel between the user terminal and the satellite is established, and the PS service data is transmitted on the channel.
On a satellite, the active wireless resource recovery method is mainly completed by the cooperation of a satellite-borne network control center and a resource distribution and recovery module: the resource allocation module is mainly responsible for receiving a service transmission request of a user terminal and allocating wireless resources for the corresponding terminal; the resource recovery module is mainly responsible for periodically executing a wireless resource recovery process, actively recovering the allocated wireless resources which are idle for a long time, and simultaneously informing the relevant user terminals through the satellite-borne network control center; the satellite-borne network control center is responsible for network control tasks directly related to service communication, processes requests of various user terminals, manages and maintains a uniform wireless resource state, and coordinates work of various modules.
The invention discloses a PS service resource active recovery method of a hybrid exchange type satellite communication system, which comprises the following steps:
(one) PS service radio resource allocation procedure
The PS service resource allocation procedure is the same as the normal resource allocation procedure: the user terminal sends out a PS service transmission application to the satellite-borne network control center according to the PS service transmission requirement; the satellite-borne network control center processes the PS service communication request of the terminal according to the current wireless resource distribution condition; after the terminal communication request is granted, a satellite communication link for the PS service is established between the user terminal and the satellite, including an uplink/downlink; the user terminal sends the PS service data to the satellite-borne router through the satellite uplink, and meanwhile receives the PS service data forwarded from the satellite-borne router through the downlink.
(II) radio resource recovery procedure
(1) PS service wireless resource usage information statistical process
The PS service radio resource usage information statistics process is mainly used to record and count the usage of the PS service radio resource for a period of time, so as to be used as a recovery judgment condition in the resource recovery process. The invention takes the PS service wireless resource (a user PS service communication transmission application) distributed each time as a PS service wireless resource management unit. Meanwhile, a data structure of the service condition of the wireless resources of the PS service is designed, and a necessary attribute, namely 'the latest service time', is added. In the process of counting the wireless resource use information, when a satellite transmission data frame is transmitted, a corresponding resource use information counting mechanism records the use condition of the allocated resources of each PS service in real time: the "most recently used time" attribute of each PS service radio resource is updated.
The satellite-borne network control center carries out real-time recording on the use condition of each allocated PS service wireless resource in each frame data transmission frame: if a certain allocated wireless resource a is used in the frame data for transmitting the actual content, the attribute "most recently used time" of the resource a is updated to the current time; if the allocated radio resource B is not used in the data of the frame, the attribute 'the latest using time' of the resource B is kept unchanged; if the PS service radio resource C belongs to the just allocated, the attribute "last used time" of resource C is initialized to the time at which resource C was allocated.
With reference to fig. 4, the PS service radio resource usage information statistics flow is as follows:
1) initializing a resource usage statistical process;
2) the flow enters a state of waiting for a new frame data transmission frame to arrive;
3) after receiving a frame data transmission frame, reading the items in the PS service wireless resource allocation table one by one, wherein each PS service user corresponds to one allocation item;
4) judging whether the wireless resource allocated by the current user is used in the frame data transmission frame:
4a) if yes, updating attribute parameter 'latest usage time't of wireless resource of the useru；
4b) If not, then jump to the next step.
5) Judging whether the PS service wireless resource allocation table item is traversed or not:
5a) if yes, the resource use information is updated, and the step 2) is skipped to;
5b) if not, the updating of the resource use information is not completed, and the step 3) is skipped to read the next distribution table entry.
(2) Radio resource recovery procedure
The PS service radio resource recovery process mainly adopts a periodic cyclic processing mechanism, i.e., checks the usage of the PS service radio resources at intervals (recovery period), and recovers the corresponding radio resources according to the radio resource recovery judgment condition. Before the resources are recovered, the satellite-borne network control center also needs to inform the involved user terminals through a satellite-to-ground network control channel, that the PS service wireless resources which are originally allocated to the user are to be recovered by the network control center. If the subsequent user terminal also needs to transmit the PS service, the resource application needs to be carried out again.
With reference to fig. 5, the PS service radio resource recycling flow chart is as follows:
1) initializing a wireless resource recovery flow;
2) initializing global variables: recovery period parameter tpRecovery time parameter trAnd a current time parameter tc；
3) Judging whether the current moment reaches the execution time of the resource recovery process:
3a) if yes, entering step 4);
3b) if not, continuing to wait and re-entering the step 3);
4) reading a table entry of a PS service wireless resource allocation table, wherein each PS service user has an allocation table entry;
5) judging the current time parameter tcWhether the difference from the "most recent usage time" of the radio resource exceeds the recovery time parameter tr：
5a) If yes, actively recovering the PS service wireless resources allocated to the user, putting the just recovered wireless resources back to the unallocated resource pool for use in next allocation, and simultaneously informing the user terminal to cancel the resource application by the network control center;
5b) if not, entering step 6);
6) judging whether the radio resource allocation table item is traversed or not:
6a) if yes, entering to wait for the next resource recovery process to arrive at the execution time, and jumping to the step 3);
6b) if not, the next allocation table entry is processed continuously, and the step 4) is jumped to.

Claims (3)

1. A PS business resources of the satellite communication system of mixed exchange type actively retrieves the method, characterized by, including PS business wireless resources distribution process and wireless resources recovery process;
(1) PS service wireless resource allocation process:
a user terminal initiates a PS service transmission request to a satellite-borne network control center through a network control channel; after the request response, acquiring corresponding wireless resources, establishing a data transmission channel between the user terminal and the satellite, and transmitting PS service data on the channel;
(2) and (3) wireless resource recovery process:
the network control center monitors the use condition of all the allocated PS service wireless resources in real time, and if the non-use time of the resources exceeds a certain time limit, the network control center performs recovery operation on the part of wireless resources and simultaneously notifies the corresponding terminal user of the recovery resource operation;
the radio resource recovery process specifically comprises:
(2-1) statistics of wireless resource usage information of PS services
2-1-1) initializing a resource usage statistical process;
2-1-2) the flow enters the process of waiting for the arrival of a new frame data transmission frame;
2-1-3) after receiving a frame data transmission frame, reading the items in the PS service wireless resource allocation table one by one, wherein each PS service user corresponds to one allocation item;
2-1-4) judging whether the radio resource allocated by the current user is used in the data transmission frame:
2-1-4a) if yes, updating the attribute parameter of the wireless resource of the user to the latest using time tu；
2-1-4b) if not, jumping to the next step;
2-1-5) judging whether the PS service wireless resource allocation table item is traversed:
2-1-5a), if yes, the resource use information is updated, and the step 2-1-2 is skipped to;
2-1-5b) if not, the updating of the resource use information is not completed, skipping to the step 2-1-3 to read the next distribution list item;
(2-2) radio resource recovery
2-2-1) initializing a wireless resource recovery process;
2-2-2) initializing global variables: recovery period parameter tpRecovery time parameter trAnd a current time parameter tc；
2-2-3) judging whether the current moment reaches the execution time of the resource recovery process:
2-2-3a), if yes, entering a step 2-2-4;
2-2-3b) if not, continuing to wait and re-entering the step 2-2-3;
2-2-4) reading a table entry of a PS service wireless resource allocation table, wherein each PS service user has an allocation table entry;
2-2-5) judging the current time parameter tcThe latest time t of use of the radio resourceuWhether the difference exceeds the recovery time parameter tr：
2-2-5a) if yes, actively recovering the PS service wireless resources allocated to the user, putting the wireless resources just recovered back to the unallocated resource pool for use in next allocation, and simultaneously informing the user terminal of canceling the resource application by the network control center;
2-2-5b) if not, entering a step 2-2-6;
2-2-6) judging whether the radio resource allocation table item is traversed or not:
2-2-6a), if yes, entering to wait for the next resource recovery process to arrive at the execution time, and skipping to the step 2-2-3;
2-2-6b) if not, continuing to process the next distribution table entry and jumping to the step 2-2-4.
2. The active PS service resource recovery method of a hybrid switching satellite communication system as claimed in claim 1, wherein the strategy for recovering the PS service radio resources is based on recent usage and determines whether the difference between the current time and the recent usage time of the allocated PS service radio resources exceeds the resource recovery time parameter, i.e. the determination condition for recovering the PS service radio resources is that
tc-tu>tr
Wherein, tcIs the current time, tuIs the time when a certain radio resource has been used recently, trIs a resource recovery time parameter;
if the judgment condition is satisfied, the network control center performs recovery processing on the corresponding wireless resource;
if the judgment condition is not satisfied, the network control center does not actively recover the part of resources.
3. The active PS service resource recovery method for a hybrid switching satellite communication system according to claim 1, wherein the PS service radio resource allocation process specifically comprises:
the user terminal sends out a PS service transmission application to the satellite-borne network control center according to the PS service transmission requirement;
the satellite-borne network control center processes the PS service communication request of the terminal according to the current wireless resource distribution condition;
after the terminal communication request is granted, a satellite communication link for the PS service is established between the user terminal and the satellite, including an uplink/downlink;
the user terminal sends the PS service data to the satellite-borne router through the satellite uplink, and meanwhile receives the PS service data forwarded from the satellite-borne router through the downlink.
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