CN108495278B - Service transmission method for low-delay resource control in satellite network - Google Patents
Service transmission method for low-delay resource control in satellite network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking
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- H—ELECTRICITY
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- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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Abstract
The invention relates to a service transmission method for low-delay resource control in a satellite network, which belongs to the technical field of resource management and wireless access, and provides a reverse-order resource block allocation method, so that a central controller can reduce the resource management processing delay; on the other hand, a method for mutually carrying a control signaling and a packet service signaling or a service transmission indication signaling is provided to realize the purpose of reducing the data transmission delay by the interactive process of less signaling. The invention can configure environmental parameters according to actual networks, so that the invention is suitable for network requirements of satellite networks, cellular networks, WiFi, WiMax and the like, and has good use value.
Description
Technical Field
The invention relates to a service transmission method for low-delay resource control in a satellite network.
Background
In a satellite network, before service transmission, a terminal first needs to acquire a time slot resource to transmit a data packet. The occupation mode of the time slot is divided into three modes of fixed allocation, random access and allocation according to needs. For the fixedly allocated time slot, the terminal can directly occupy the time slot to transmit the data packet; for the dynamic time slot of random access, the terminal needs to seize the time slot and transmit a data packet; for the time slot allocated according to the requirement, the basic process of the terminal service transmission is described as 1) the terminal sends a service transmission resource request signaling through an uplink control channel; 2) a resource management module of a SMAC layer of a central controller allocates time slot resources and sends the allocated time slots through a downlink control channel; 3) and the terminal receives the allocated time slot and sends a receiving confirmation message. 4) And the terminal occupies the allocated time slot to send the data packet. It can be seen that the ways and contents for acquiring the timeslot resources in different ways are different, and the satellite network implements service access and data packet transmission through the capacity request and resource allocation function of the resource control module of the MAC layer (SMAC).
The SMAC layer of the satellite network supports four distribution algorithms of continuous rate distribution, dynamic capacity distribution based on rate, dynamic capacity distribution based on flow and idle capacity distribution.
The continuous rate allocation does not need a terminal to send a capacity request, the satellite controller allocates a time slot for the terminal in a static fixed allocation mode and issues the time slot to the terminal through a control channel, the terminal transmits service on the allocated time slot after receiving the allocated time slot, and if no service is transmitted, the time slot is kept in an idle state.
A dynamic capacity allocation mode based on rate and flow requires that a terminal firstly reports service transmission capacity/rate transmission demand through an uplink control channel, after a central controller allocates a channel, the central controller returns allocated time slots through the control channel, and the terminal reports and receives confirmation information through the control channel and then occupies the allocated time slots to transmit data packets.
The allocation of the free capacity refers to that the satellite controller allocates the capacity for the terminal directly according to the configuration file without any request, and transmits the allocation condition of the redundant free channel to the terminal through a control channel, and the allocation formula belongs to redundant allocation and is less in use at present.
It can be known from the on-demand service transmission process that the resource control scheme of the SMAC layer not only needs to solve the timeslot resource allocation problem but also needs to design a reasonable signaling interaction process.
The continuous rate allocation scheme is simple and easy to implement in the low user capacity scene, but as the user capacity increases, the problem of time delay caused by low user access success probability becomes more serious. The dynamic capacity allocation mode based on rate/flow belongs to an on-demand allocation mode, can meet the transmission requirement of a user, and also has better network capacity performance, but the allocation mode is as shown in fig. 1(1) - (2), time slots occupied by burst services and on-demand allocation services are discretized, on one hand, the resource management by the SMAC is not convenient, on the other hand, the central controller needs to broadcast the time slot structure of the current frame to the terminal, and the discretized time slot allocation mode table occupies a very long field, and simultaneously increases the difficulty of selecting the time slots by the burst services.
The control signaling of the satellite network is separated from the traffic transmission, i.e. the control signaling is managed via the control plane and transmitted via the control channel, and the traffic is managed via the user plane and transmitted via the traffic channel. This method has high transmission reliability, but for a satellite network with large satellite-to-ground transmission delay (e.g., 270ms of geostationary satellite transmission delay), the time cost for acquiring the slot resource pool through three-way handshake is nearly 1s, and the end-to-end delay performance is seriously affected.
Disclosure of Invention
The technical problem solved by the invention is as follows: the invention overcomes the deficiency of the prior art, has provided a business transmission method of low time delay resource control in satellite network, solve the discrete problem of the random time slot, give a simplified signaling transmission scheme at the same time, reduce the interactive course of the signalling through the way that control signalling and business signalling carry each other, improve the time delay performance of the system, the time slot assignment method according to need of the reverse order in the method of the invention, the central controller distributes the time slot according to terminal flow/capacity demand dynamic, the time slot number begins the reverse order from the frame end to distribute, has realized the time slot polymerization of allocating as required, facilitate the time slot selection of resource management and burst business of the central controller; in addition, by the method of transmitting the small-capacity service along with the signaling and transmitting the large-capacity service carrying signaling indication, the state of completely separating the control signaling from the service transmission is broken through, the signaling interaction process is simplified, and the system transmission delay is reduced.
The technical solution of the invention is as follows: a service transmission method for low-delay resource control in a satellite network comprises the following steps:
(1) time slot allocation is carried out according to the requirements in a reverse order; the method for allocating the time slots according to the requirements in the reverse order comprises the following steps: dynamically allocating time slots according to the capacity requirement of the terminal process, and allocating time slot numbers in a reverse order from the frame tail;
(2) the control signaling and the service transmission carry and transmit mutually; the control signaling and service transmission mutual carrying transmission method comprises the following steps: the control signaling transmission process carries service data transmission, and the control service transmission process carries signaling transmission indication.
The time slot allocation method according to the requirement in the reverse order is separated from the random access time slot allocation according to the requirement, the length of the time slot allocation according to the requirement and the length of the random access time slot can be dynamically adjusted along with the network capacity, and the total length of the time slot allocation according to the requirement and the total length of the random access time slot have the maximum and minimum length constraints.
The SMAC layer realizes the extraction of the signaling and the service data packet in the mutual carrying and transmission process of the control signaling and the service transmission.
The reverse order on-demand time slot allocation method uses a sliding window to adaptively adjust the length of the dynamic on-demand time slot.
The control signaling and the service transmission carry and transmit each other:
when the terminal detects that the reserved time slot resources need to be expanded, the terminal carries the expanded _ Request and the time slot expansion length when the terminal sends the service data in the current reserved time slot.
The control signaling and the service transmission carry and transmit each other:
(1) the central controller sends message Poll to the terminal A according to the polling list, and carries out different calling content combinations according to whether there is a message sent to the terminal A, and simultaneously starts a timer TPollAnd counter NPoll；
(11) If the message sent to the terminal A is not available, the message Poll only carries an inquiry field and inquires whether the terminal A has a message sent to the central controller;
(12) if the message sent to the terminal A exists, combining the message content according to the message length;
(a) if the message is a long message, sending a message Poll-ResGT and carrying the message length, the frame number and the time slot number;
(b) if the short message is sent, sending a message Poll-Data and carrying the short message;
(2) the terminal A receives the message Poll sent by the central controller, and judges whether the destination address of the message Poll is the address of the terminal:
(21) if the address of the terminal is the address of the terminal, receiving the message, performing receiving response processing according to the message transmission indication information, and simultaneously judging whether the terminal has the message sent to the central controller, if so, carrying the message in response information;
(a) if the central controller sends a message Poll-ResGT or Poll-Data, judging the length of the message:
if the carried short message is the Data content, directly receiving the Data content, and entering the step c) after the Data content is received;
if the message is a long message, recording the position information of the reserved transmission resource, and entering the step (c);
(b) if the message Poll does not carry the message transmission indication information, directly entering the step (c);
(c) the terminal A judges whether the content carried by the message Poll is successfully received:
and successfully receiving, sending a message ACK to the central controller, carrying successful transmission indication information 1, and detecting whether the message sent to the central controller exists:
if the message sent to the central controller exists, judging the length of the message to be sent:
sending a message ACK-ReqGT with a reserved transmission resource reservation field and a reserved time slot length by a long message, and starting a timer T at the same timeReqGT；
Short message, sending message ACK-Data, carrying Data content, and starting timer TData；
If the message is not sent to the central controller, the message ACK does not carry any other information except the receiving indication information;
receiving failure, sending a message ACK carrying failure transmission indication information 0, and detecting whether a message sent to a central controller exists:
if the message sent to the central controller exists, judging the length of the message to be sent:
sending a message ACK-ReqGT with a reserved transmission resource reservation field and a reserved time slot length by a long message, and starting a timer T at the same timeReqGT；
Short message, sending message ACK-Data, carrying Data content, and starting timer TData；
If there is no message sent to the central controller, the message ACK/NACK carries no other information than the reception indication information.
(22) If not, discarding the message;
the central controller receives the message ACK/NACK sent by the terminal A and stops TPollAnd NPoll，Detecting the message transmission indication message;
(23) if the successful receiving indication is 1, detecting whether a message sent to the central controller exists:
(a) if there is a message sent to the central controller, judging the message length indication field;
if the message is long, a resource pool is allocated according to the length of the message, and the message is carried in a message ACK-ResGT to be sent to the terminal A;
if the message is short, the Data of the content is received; after receiving, sending a message ACK to the terminal A;
(b) if no message sent to the central controller is detected, initiating a message Poll to the next terminal according to the polling list;
(24) if the successful receiving indication is 0, detecting a message transmission indication field, and simultaneously carrying out message retransmission content combination:
if the message sent to the central controller is detected, judging a message length indication field;
a long message is distributed to a resource pool according to the length of the message and is carried in a retransmission message ACK-ResGT-Data/ACK-ResGT-ResGT and is sent to a terminal A;
the short message starts to receive the Data content, and after the short message is received, the short message sends a message ACK to the terminal A and simultaneously carries a retransmission message ACK-Data/ACK-ResGT;
if T isPollWhen the time is out, no message ACK/NACK is received, NPoll+1, continuing polling the terminal A, if the maximum polling times are no response to the polling call, considering that the terminal is offline, and performing offline processing;
after receiving the message ACK/ACK-ResGT/ACK-ResGT-Data/ACK-ResGT-ResGT and stopping the timer TReqGT/TDataJudging whether resource pool indication information exists:
(25) if yes, storing the position information of the resource pool;
(26) if not, no treatment is performed.
If T isReqGTOr TDataIf the time is out, the message ACK is not received and any message combination of the ACK is not received, the service can not be actively initiated again.
Compared with the prior art, the invention has the advantages that:
(1) the reverse order time slot allocation on demand method in the method of the invention can be applied to various networks as a resource management scheme, such as satellite network, LTE, WiMax, WLAN, WiFi, NB-LoT, the time slot can be a single time slot or a time slot block, the sliding window can be a virtual concept or a time slot length threshold value which is actually set;
(2) the method for mutually carrying and transmitting the control signaling and the service transmission in the method is not limited to the satellite network, can also be applied to various ground networks, such as LTE, WiMax, WLAN, WiFi, NB-LoT and the like, can be applied to various transmission processes, such as a link release process, a link establishment process, a call establishment process and the like, according to the actual network conditions, and has good use value.
Drawings
FIG. 1 is a diagram illustrating dynamic timeslot allocation in the method of the present invention;
FIG. 2 is a diagram of a dynamic allocation of time slots and time slot allocation scheme in the method of the present invention;
FIG. 3 is a flow chart of time slot expansion in the method of the present invention;
FIG. 4 is a flow chart of Poll flow;
FIG. 5 is a flow chart of the method of the present invention.
Detailed Description
The present invention provides a service transmission method for low-latency resource control in a satellite network, aiming at the defects of the prior art, and as shown in fig. 5, the method is a flow chart of the method of the present invention, the present invention comprises reverse order time slot allocation according to needs, control signaling and service transmission which are mutually carried and transmitted, wherein: the reverse order demand time slot allocation method comprises the steps that a control center controller dynamically allocates time slots according to capacity requirements of a terminal process, and time slot numbers are allocated in a reverse order from the frame tail; allocating time slots according to needs and separating the time slots from random access time slots; the lengths of the time slots allocated according to the needs and the random access time slots can be dynamically adjusted along with the network capacity; the total length of the on-demand assigned time slots and the total length of the random access time slots have a maximum and minimum length constraint. The method for carrying and transmitting the control signaling and the service transmission mutually comprises the steps that the signaling transmission can carry small-capacity service transmission; the service transmission can carry control information such as signaling transmission indication; the control plane and the user plane realize cross-plane management; and a cross-plane management module is added in the SMAC layer to realize the extraction, separation and regression of the signaling and the service data packet. The process according to the invention is explained and illustrated in more detail below with reference to the figures and the embodiments.
Example 1
A scheme of contention/resource pool contention/application along with transmission and transmission along with transmission is adopted in a dynamic capacity allocation mode based on rate/flow, and for various types of services which are from a plurality of terminals and need to continuously occupy a plurality of time slots, a satellite controller needs to dynamically allocate the time slot resource pool for the terminals according to needs, as shown in (1) of fig. 1, random access time slot resources are dispersed, which is not beneficial to the realization of a random access algorithm; or as shown in fig. 1(2), the whole time slot is divided into a random access part and a dynamic demand allocation part, and when the dynamic allocation traffic is far lower than the transmission capacity of the dynamic allocation time slot, the idle time slot will be wasted. In this embodiment, considering the drawbacks of the above solutions, the length of the random access time zone and the length of the dynamically allocated time zone are designed to be dynamically adjustable, as shown in fig. 1(3), the satellite controller allocates time slots in the dynamically allocated time zone as needed, and the sliding window adjusts the length of the dynamically allocated time zone according to the actual time slot allocation amount. Therefore, on one hand, the discretization of the random access time slot is avoided, and on the other hand, the time slot utilization rate is also improved.
For the convenience of resource management, discrete dynamic demand allocation time slots are aggregated together, and a reverse order allocation scheme from the end of the frame is shown in fig. 2, and the slot from the end of the frame is used as a starting time slot, allocated forward slot by slot, and stopped when the service requirement of the application frame is met or the maximum length constraint of the dynamic demand allocation time slot is reached. Therefore, the total length of the dynamically allocated time slots for different frames varies with the network traffic, and the length of the random access time slots varies accordingly.
Example 2
In this embodiment, a time slot extension is taken as an example to describe a time slot extension information transmission process, and as shown in fig. 3, an information interaction process is reduced by carrying a control signaling indication in a service transmission process. In the protocol stack structure, a control plane and user plane interaction management module needs to be added in the SMAC layer to take charge of extracting signaling and service data and realize the dark box operation of the signaling regression control plane and the service regression user plane.
When the terminal has a requirement for timeslot expansion, it may carry timeslot expansion indication information while transmitting a service in the current reserved timeslot, and the flow description is shown in fig. 3 (2).
(1) When a terminal detects that the reserved time slot resources need to be expanded and the terminal sends service Data in the current reserved time slot, the terminal carries a time slot expansion indication expanded _ Request and also comprises time slot expansion length related information;
(2) after receiving the service, the controller analyzes and judges, allocates an extended time slot for the terminal, and sends the extended time slot to the terminal in cooperation with an ACK message;
(3) the terminal continues to transmit traffic on the extended time slot.
The scheme of the invention simplifies the process that the terminal sends two messages of the time slot expansion control signaling through the random competition time slot, reduces the collision probability of the competition time slot between the terminal and the burst message, reduces the number of the system messages in the network and further reduces the probability of crosstalk between the messages from the aspect of network system performance; in terms of terminal performance, the original scheme may cause the time delay of sending the control message due to the failure of competition, so that the service transmission is interrupted.
Example 3
In this embodiment, a polling access is taken as an example to describe a transmission flow of a small-capacity service transmission content carried in a signaling message or a related large-capacity service transmission indication information, as shown in fig. 4. In the protocol stack structure, a control plane and user plane interaction management module needs to be added in the SMAC layer to take charge of extracting signaling and service data and realize the dark box operation of the signaling regression control plane and the service regression user plane.
If the terminal A is scheduled in the current time slot, the central controller sends a message Poll to the terminal A to inquire whether the terminal has a message sent to the central controller, and in the process, if the central controller has the message sent to the terminal A, the message Poll needs to be carried in the message.
In the example, a long message is used to indicate a large-capacity service that needs to continuously occupy multiple time slots or time slot blocks, and a short message is used to indicate a service that can be completed in a current time slot, a single time slot or a single time slot block.
(1) The central controller sends message Poll to the terminal A according to the polling list, and carries out different calling content combinations according to whether there is a message sent to the terminal A, and simultaneously starts a timer TPollAnd a counter NPoll；
(11) If there is no message sent to terminal a, the message Poll only carries the query field: inquiring whether a terminal A has a message sent to a central controller;
(12) if the message sent to the terminal A exists, combining the message content according to the message length;
(a) if the message is a long message, sending a message Poll-ResGT which at least carries GT resource related information (message length, frame number, time slot number) to be occupied;
(b) if the short message is sent, sending a message Poll-Data carrying the specific message content.
(2) The terminal A receives the message Poll sent by the central controller, and judges whether the destination address of the message Poll is the address of the terminal:
(21) if the address of the terminal is the address of the terminal, the message is received, corresponding receiving/response processing is carried out according to the message transmission indication information, and whether the terminal has the message sent to the central controller or not is judged, if so, the terminal needs to be carried in response information.
(a) If the central controller sends a message Poll-ResGT or Poll-Data, judging the length of the message:
if the carried short message is the Data content, directly receiving the Data content, and entering the step (b) after the Data content is received;
if the message is a long message, recording the reserved transmission resource position information (waiting for receiving the message in the reserved time slot), and entering the step (b).
(b) If the message Poll does not carry the message transmission indication information, directly entering the step (c);
(c) the terminal A judges whether the content carried by the message Poll is successfully received:
and successfully receiving, sending a message ACK to the central controller, carrying successful transmission indication information 1, and detecting whether the message sent to the central controller exists:
if the message sent to the central controller exists, judging the length of the message to be sent:
long message, sending message ACK-ReqGT, carrying at least reservation field of reserved transmission resource, reserved time slot length and other related information, and starting timer TReqGT；
Short message, sending message ACK-Data, carrying at least Data content, and starting timer TData。
If there is no message sent to the central controller, the message ACK carries no other information except the reception indication information.
Receiving fails, sends a message ACK (or called NACK message), carries failure transmission indication information 0, and detects whether there is a message sent to the central controller:
if the message sent to the central controller exists, judging the length of the message to be sent:
long message, sending message ACK-ReqGT, carrying at least reservation field of reserved transmission resource, reserved time slot length and other related information, and starting timer TReqGT；
Short message, sending message ACK-Data, carrying at least Data content, and starting timer TData。
If there is no message sent to the central controller, the message ACK/NACK carries no other information than the reception indication information.
(22) If not, the message is discarded.
The central controller receives the message ACK/NACK sent by the terminal A and stops TPollAnd NPoll，Detects its message transmission indication message and,
(23) if the successful receiving indication is 1, detecting whether a message sent to the central controller exists:
(a) if there is a message sent to the central controller, the message length indication field is judged
If the message is long, a resource pool is allocated according to the length of the message, and the message is carried in a message ACK-ResGT to be sent to the terminal A;
if the message is short, the Data of the content is received; and after receiving, sending a message ACK to the terminal A.
(b) If no message sent to the central controller is detected, initiating a message Poll to the next terminal according to the polling list, and entering the step <1 >.
(24) If the successful receiving indication is 0, detecting a message transmission indication field, and simultaneously performing message retransmission content combination, namely:
(a) if a message sent to the central controller is detected, the message length indication field is judged
A long message is distributed to a resource pool according to the length of the message and is carried in a retransmission message ACK-ResGT-Data/ACK-ResGT-ResGT and is sent to a terminal A;
the short message starts to receive the Data content, and after the short message is received, the short message sends a message ACK to the terminal A and simultaneously carries a retransmission message ACK-Data/ACK-ResGT; entering the step <1 >;
if T isPollWhen the time is out, no message ACK/NACK is received, NPoll+1, continuing to poll the terminal a, with the maximum polling number N (N ═ 2); if the polling call is not answered for N times, the terminal is considered to be offline, and offline processing (i.e., the terminal is deleted from the polling list, etc.) is performed, which is not within the scope of the document design.
After terminal A receives the message ACK/ACK-ResGT/ACK-ResGT-Data/ACK-ResGT-ResGT, it stops timer TReqGT/TData,Judging whether resource pool indication information exists:
(25) if yes, storing the resource pool position information, and waiting for the resource pool position to send a message to the central controller;
(26) if not, no treatment is performed.
If T isReqGTOr TDataIf the time is out, the message ACK and any message combination of the ACK are not received, the service cannot be actively initiated again, and only the service sending request can be raised in the dynamic access area, which is shown in a transmission scheme of the dynamic access area.
In the above process, all terminals need to continuously monitor the system message, and if receiving the ResGT message, the channel state utilization table recorded by the terminal is updated. If the central controller has a message to be transmitted to the terminal but the call flow of the terminal A is not yet in turn, the message is cached firstly. The ACK message in the above process is executed according to the need, if not necessary, the ACK message is not returned. The timer and the timer are adopted and set according to actual conditions. The message carrying field in the above process is described as follows: poll: carrying at least a terminal ID and message length indication information; Poll-Data: carrying at least terminal ID, service type, service priority and message length information; Poll-ResGT: at least carrying the type of the reservation message, the reserved transmission frame number (for example, from the starting frame to the ending frame), the time slot number and the like; ACK-Data: at least carrying receiving status, transmission indication, transmission content related information (type, priority, etc.); ACK-ReqGT: at least carrying the resource block size of the intended application, etc.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (6)
1. A service transmission method for low-delay resource control in a satellite network is characterized by comprising the following steps:
(1) time slot allocation is carried out according to the requirements in a reverse order; the method for allocating the time slots according to the requirements in the reverse order comprises the following steps: dynamically allocating time slots according to the capacity requirement of the terminal, and allocating time slot numbers in a reverse order from the frame tail;
allocating time slots according to needs and separating random access time slots, aggregating discrete dynamic allocation time slots according to needs together, allocating the time slots in reverse order from the frame tail, allocating the time slots forward one by taking the frame tail time slot as an initial time slot, stopping when the time slots are allocated to meet the service requirement of an application frame or reach the maximum length constraint of the dynamic allocation time slots according to needs, and designing the length of a random access time zone and the length of a dynamic allocation time zone to be dynamically adjustable;
(2) the control signaling and the service transmission carry and transmit mutually; the control signaling and service transmission mutual carrying transmission method comprises the following steps: the control signaling transmission process carries service data transmission, and the control service transmission process carries signaling transmission indication.
2. The method according to claim 1, wherein the method for transmitting the service controlled by the low latency resource in the satellite network comprises: the time slot allocation method according to the requirement in the reverse order is separated from the random access time slot allocation according to the requirement, the length of the time slot allocation according to the requirement and the length of the random access time slot can be dynamically adjusted along with the network capacity, and the total length of the time slot allocation according to the requirement and the total length of the random access time slot have the maximum and minimum length constraints.
3. The method according to claim 1 or 2, wherein the method for transmitting the service controlled by the low latency resource in the satellite network comprises: in the mutual carrying and transmission process of the control signaling and the service transmission, the SMAC layer realizes the extraction of the signaling and the service data packet.
4. The method according to claim 1 or 2, wherein the method for transmitting the service controlled by the low latency resource in the satellite network comprises: the reverse order on-demand time slot allocation method uses a sliding window to adaptively adjust the length of the dynamic on-demand time slot.
5. The method according to claim 1 or 2, wherein the method for transmitting the service controlled by the low latency resource in the satellite network comprises: the control signaling and the service transmission carry and transmit each other:
when the terminal detects that the reserved time slot resources need to be expanded, the terminal carries the expanded _ Request and the time slot expansion length when the terminal sends the service data in the current reserved time slot.
6. The method according to claim 1 or 2, wherein the method for transmitting the service controlled by the low latency resource in the satellite network comprises: the control signaling and the service transmission carry and transmit each other:
(1) the central controller sends message Poll to the terminal A according to the polling list, and carries out different calling content combinations according to whether there is a message sent to the terminal A, and simultaneously starts a timer TPollAnd counter NPoll；
(11) If the message sent to the terminal A is not available, the message Poll only carries an inquiry field and inquires whether the terminal A has a message sent to the central controller;
(12) if the message sent to the terminal A exists, combining the message content according to the message length;
(a) if the message is a long message, sending a message Poll-ResGT and carrying the message length, the frame number and the time slot number;
(b) if the short message is sent, sending a message Poll-Data and carrying the short message;
(2) the terminal A receives the message Poll sent by the central controller, and judges whether the destination address of the message Poll is the address of the terminal:
(21) if the address of the terminal is the address of the terminal, receiving the message, performing receiving response processing according to the message transmission indication information, and simultaneously judging whether the terminal has the message sent to the central controller, if so, carrying the message in response information;
(a) if the central controller sends a message Poll-ResGT or Poll-Data, judging the length of the message:
if the carried short message is the Data content, directly receiving the Data content, and entering the step c) after the Data content is received;
if the message is a long message, recording the position information of the reserved transmission resource, and entering the step (c);
(b) if the message Poll does not carry the message transmission indication information, directly entering the step (c);
(c) the terminal A judges whether the content carried by the message Poll is successfully received:
and successfully receiving, sending a message ACK to the central controller, carrying successful transmission indication information 1, and detecting whether the message sent to the central controller exists:
if the message sent to the central controller exists, judging the length of the message to be sent:
sending a message ACK-ReqGT with a reserved transmission resource reservation field and a reserved time slot length by a long message, and starting a timer T at the same timeReqGT；
Short message, sending message ACK-Data, carrying Data content, and starting timer TData；
If the message is not sent to the central controller, the message ACK does not carry any other information except the receiving indication information;
receiving failure, sending a message NACK, carrying failure transmission indication information 0, and detecting whether a message sent to a central controller exists:
if the message sent to the central controller exists, judging the length of the message to be sent:
sending a message ACK-ReqGT with a reserved transmission resource reservation field and a reserved time slot length by a long message, and starting a timer T at the same timeReqGT；
Short message, sending message ACK-Data, carrying Data content, and starting timer TData；
If the message is not sent to the central controller, the message ACK/NACK does not carry any other information except the receiving indication information;
(22) if not, discarding the message;
the central controller receives the message ACK/NACK sent by the terminal A and stops TPollAnd NPollDetecting the message transmission indication message;
(23) if the successful receiving indication is 1, detecting whether a message sent to the central controller exists:
(a) if there is a message sent to the central controller, judging the message length indication field;
if the message is long, a resource pool is allocated according to the length of the message, and the message is carried in a message ACK-ResGT to be sent to the terminal A;
if the message is short, the Data of the content is received; after receiving, sending a message ACK to the terminal A;
(b) if no message sent to the central controller is detected, initiating a message Poll to the next terminal according to the polling list;
(24) if the successful receiving indication is 1, detecting a message transmission indication field, and simultaneously carrying out message retransmission content combination:
if the message sent to the central controller is detected, judging a message length indication field;
a long message is distributed to a resource pool according to the length of the message and is carried in a retransmission message ACK-ResGT-Data/ACK-ResGT-ResGT and is sent to a terminal A;
the short message starts to receive the Data content, and after the short message is received, the short message sends a message ACK to the terminal A and simultaneously carries a retransmission message ACK-Data/ACK-ResGT;
if T isPollWhen the time is out, no message ACK/NACK is received, NPoll+1, continuing polling the terminal A, wherein the maximum polling times is N, and if the polling calls of N times are not answered, considering that the terminal is offline, and performing offline processing;
after receiving the message ACK/ACK-ResGT/ACK-ResGT-Data/ACK-ResGT-ResGT and stopping the timer TReqGT/TDataJudging whether resource pool indication information exists:
(25) if yes, storing the position information of the resource pool;
(26) if not, no treatment is carried out;
if T isReqGTOr TDataAnd if the time is out and any message combination of the ACK is not received, the service cannot be actively initiated again.
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| CN114827920B (en) * | 2021-01-11 | 2023-04-28 | 大唐移动通信设备有限公司 | Communication method, device, equipment and readable storage medium |
| CN116506950B (en) * | 2023-06-27 | 2023-09-15 | 南京控维通信科技有限公司 | Dynamic time slot allocation method based on QoS strategy |
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