CN106921427B - Access processing method and device for satellite communication network - Google Patents
Access processing method and device for satellite communication network Download PDFInfo
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- CN106921427B CN106921427B CN201510993318.9A CN201510993318A CN106921427B CN 106921427 B CN106921427 B CN 106921427B CN 201510993318 A CN201510993318 A CN 201510993318A CN 106921427 B CN106921427 B CN 106921427B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
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Abstract
The invention provides an access processing method and device of a satellite communication network, wherein a terminal measures the signal-to-noise ratio of forward reception of the terminal access network, the terminal compares the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value, and the terminal determines the mode of initiating an access request by the terminal corresponding to the comparison result, wherein the mode comprises one of the following modes: the spread spectrum access mode and the non-spread spectrum access mode solve the problem of resource waste when the spread spectrum modulation code initiates an access request in a satellite communication system, and improve the utilization rate of the system bandwidth.
Description
Technical Field
The invention relates to the field of communication, in particular to an access processing method and device of a satellite communication network.
Background
In a Digital Video Broadcast return through a Satellite channel (DVB-RCS) standard protocol, a Satellite communication system reversely adopts Multi-frequency Time Division Multiple Access (MF-TDMA) transmission, reverse bandwidth resources allocate Access Time slot resources according to a superframe structure, specifically, a master station Superframe Composition Table (SCT) and a Broadcast Configuration Table (BCT) Broadcast message indicate that a user terminal reversely superframes fixedly available Access Time slot resources, after receiving SCT and BCT Broadcast overheads, an Access request is initiated through a specified fixed Access Time slot resource, and then an Access collision solution scheme is used to solve the problem of sharing the Access Time slot resources by Multiple user terminals. In the above access method, the access time slot resources are shared and are all fixed resources. Because the spread spectrum modulation coding mode can demodulate signals under the condition of lower signal noise, but the occupied resources of the spread spectrum modulation coding mode are 4 times of the non-spread spectrum modulation coding mode generally, in order to ensure that the access terminal with the worst signal noise ratio can also be accessed to the system normally, the access time slot of the access terminal fixedly uses the most conservative spread spectrum modulation coding mode to initiate an access request, namely the access requests initiated by the access terminals under the conditions of different signal noise ratios need to use the same spread spectrum modulation coding mode. Therefore, the problem of resource waste exists when the user terminal with good signal-to-noise ratio condition uses the conservative spread spectrum modulation code to initiate the access request, which is a very important key point for improving the bandwidth resource under the characteristic of limited bandwidth resource of the satellite communication system.
Aiming at the characteristics of long link distance, large propagation delay, large link loss, large coverage area, limited bandwidth resources and the like of a satellite communication system, access time slot resources need to be fully utilized, so that more user terminal access numbers are supported under the same access time slot resources, and the utilization rate of system bandwidth is improved.
Aiming at the problem of resource waste when a spread spectrum modulation code initiates an access request in a satellite communication system in the related technology, no effective solution is available at present.
Disclosure of Invention
The invention provides an access processing method and device of a satellite communication network, which at least solve the problem of resource waste when a spread spectrum modulation code initiates an access request in a satellite communication system in the related technology.
According to an aspect of the present invention, there is provided an access processing method for a satellite communication network, including:
the terminal measures the signal-to-noise ratio of forward reception of the terminal access network;
the terminal compares the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value;
the terminal determines a mode of initiating an access request by the terminal corresponding to the comparison result, wherein the mode includes one of the following modes: a spread spectrum access mode and a non-spread spectrum access mode.
Further, according to the comparison result, the method for the terminal to determine that the terminal corresponding to the comparison result initiates the access request includes one of the following:
under the condition that the signal-to-noise ratio is smaller than the spread spectrum signal-to-noise ratio threshold value, the terminal determines that an access mode for initiating an access request is the spread spectrum access mode, wherein the spread spectrum access mode is to initiate the access request through a spread spectrum modulation coding mode within the time of a spread spectrum access period threshold value;
and under the condition that the signal-to-noise ratio is greater than or equal to the spread spectrum signal-to-noise ratio threshold value, the terminal determines that the access mode for initiating the access request is the non-spread spectrum access mode, wherein the non-spread spectrum access mode initiates the access request through a non-spread spectrum modulation coding mode within the time of a non-spread spectrum access period threshold value.
Further, before the terminal measures the signal-to-noise ratio of the forward reception of the terminal access network, including,
and the terminal receives a super frame composition table (SCT) broadcast message, wherein the SCT broadcast message carries the spread spectrum signal-to-noise ratio threshold value and the spread spectrum access period threshold value.
Further, before the terminal receives the SCT broadcast message, the method further includes:
and the access network detects the failure times of the terminal accessing the network within the time indicated by the spread spectrum access period threshold value, and reduces the spread spectrum access period threshold value under the condition that the failure times are greater than a preset spread spectrum failure rate threshold value.
Further, before the terminal compares the snr with a threshold value of the spread spectrum snr according to the snr, the method further includes:
the terminal adjusts the spread spectrum signal-to-noise ratio threshold value according to the antenna type configured by the terminal, wherein the manner of adjusting the spread spectrum signal-to-noise ratio threshold value comprises:
H＝A-B；
h is the adjusted threshold value of the spread spectrum signal-to-noise ratio, A is the threshold value of the spread spectrum signal-to-noise ratio before adjustment, B is the loss of the terminal antenna, and H, A and B are rational numbers, wherein the unit of H and A is dBm, and the unit of B is dB.
Further, after the terminal determines the manner of initiating the access request by the terminal corresponding to the comparison result, the method further includes,
the terminal initiates an access request for accessing the network according to the access mode;
and in case of access failure, initiating an access request for accessing the network again.
Further, under the condition of the access failure, detecting whether the duration of the access failure is less than a preset access failure duration threshold value;
randomly generating a delay time of the access request for reinitiating the access to the network under the condition that the delay time is smaller than the preset access failure time length threshold value, and reinitiating the access request for accessing the network after the delay time is reached;
and directly initiating the access request for accessing the network again under the condition that the access time length is not less than the preset access failure time length threshold value.
Further, the method for initiating the access request for accessing the network again comprises the following steps:
and initiating an access request for accessing the network again according to the access collision solution.
According to another aspect of the present invention, there is provided an access processing apparatus for a satellite communication network, located in a terminal, including:
the measurement module is used for measuring the signal-to-noise ratio of the forward reception of the terminal access network;
the comparison module is used for comparing the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value;
a determining module, configured to determine a manner in which the terminal corresponding to the comparison result initiates an access request, where the manner includes one of: a spread spectrum access mode and a non-spread spectrum access mode.
Further, the determining module includes one of:
a first access unit, configured to determine, when the signal-to-noise ratio is smaller than the spread spectrum signal-to-noise ratio threshold value, that an access manner initiating an access request is the spread spectrum access manner, where the spread spectrum access manner is to initiate the access request in a spread spectrum modulation coding manner within a time of a spread spectrum access period threshold value;
a second access unit, configured to determine, when the signal-to-noise ratio is greater than or equal to the spread-spectrum signal-to-noise ratio threshold, that an access manner initiating an access request is the non-spread-spectrum access manner, where the non-spread-spectrum access manner is to initiate the access request in a non-spread-spectrum modulation coding manner within a time of a non-spread-spectrum access period threshold.
Further, the apparatus further comprises:
a receiving module, configured to receive, by the terminal, an SCT broadcast message sent by a master station before measuring a forward received signal-to-noise ratio of the terminal accessing a network, where the SCT broadcast message carries the spread spectrum signal-to-noise ratio threshold and the spread spectrum access period threshold.
By the invention, a terminal measures the signal-to-noise ratio of forward reception of the terminal access network, the terminal compares the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value, and the terminal determines the mode of initiating the access request by the terminal corresponding to the comparison result, wherein the mode comprises one of the following modes: the spread spectrum access mode and the non-spread spectrum access mode solve the problem of resource waste when the spread spectrum modulation code initiates an access request in a satellite communication system, and improve the utilization rate of the system bandwidth.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of an access processing method of a satellite communication network according to an embodiment of the present invention;
fig. 2 is a first block diagram of an access processing apparatus of a satellite communication network according to an embodiment of the present invention;
fig. 3 is a block diagram of an access processing apparatus of a satellite communication network according to an embodiment of the present invention;
FIG. 4 is a basic process flow diagram in accordance with a preferred embodiment of the present invention;
FIG. 5 is a reverse interference exception handling flow diagram in accordance with a preferred embodiment of the present invention;
FIG. 6 is a flow diagram of a dynamic adjustment configuration process in accordance with a preferred embodiment of the present invention;
fig. 7 is a process flow diagram of an access terminal antenna configuration in accordance with a preferred embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In this embodiment, an access processing method of a satellite communication network is provided, and fig. 1 is a flowchart of an access processing method of a satellite communication network according to an embodiment of the present invention, as shown in fig. 1, the flow includes the following steps:
step S102, the terminal measures the signal-to-noise ratio of the forward receiving of the terminal access network;
step S104, the terminal compares the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value;
step S106, the terminal determines the mode of the terminal initiating the access request corresponding to the comparison result, wherein the mode includes one of the following: a spread spectrum access mode and a non-spread spectrum access mode.
Through the steps, the terminal measures the signal-to-noise ratio of forward reception of the terminal access network, the terminal compares the signal-to-noise ratio with the spread spectrum signal-to-noise ratio threshold value, and the terminal determines the mode of initiating the access request by the terminal corresponding to the comparison result, wherein the mode comprises one of the following modes: the spread spectrum access mode and the non-spread spectrum access mode solve the problem of resource waste when the spread spectrum modulation code initiates an access request in a satellite communication system, and improve the utilization rate of the system bandwidth.
In this embodiment, according to the comparison result, the manner in which the terminal determines that the terminal corresponding to the comparison result initiates the access request includes one of the following:
under the condition that the signal-to-noise ratio is smaller than the spread spectrum signal-to-noise ratio threshold value, the terminal determines that the access mode for initiating the access request is the spread spectrum access mode, wherein the spread spectrum access mode initiates the access request through a spread spectrum modulation coding mode within the time of a spread spectrum access period threshold value;
and when the signal-to-noise ratio is greater than or equal to the spread spectrum signal-to-noise ratio threshold value, the terminal determines that the access mode for initiating the access request is the non-spread spectrum access mode, wherein the non-spread spectrum access mode initiates the access request through a non-spread spectrum modulation coding mode within the time of a non-spread spectrum access period threshold value.
In this embodiment, before the terminal measures the signal-to-noise ratio of forward reception of the terminal accessing the network, the terminal receives a super-frame composition table SCT broadcast message, where the SCT broadcast message carries the spread spectrum signal-to-noise ratio threshold and the spread spectrum access period threshold, and the terminal may receive the super-frame composition table SCT sent by the master station, or may receive the super-frame composition table SCT through other devices.
In this embodiment, before the terminal receives the SCT broadcast message, the access network detects the number of failures of the terminal to access the network within the time indicated by the spread spectrum access period threshold, and reduces the spread spectrum access period threshold when the number of failures is greater than a preset spread spectrum failure rate threshold.
In this embodiment, before the terminal compares the snr with the spread spectrum snr threshold, the terminal adjusts the spread spectrum snr threshold according to an antenna type configured for the terminal, where the adjusting the spread spectrum snr threshold includes:
H＝A-B；
h is the threshold value of the spread spectrum SNR after adjustment, A is the threshold value of the spread spectrum SNR before adjustment, B is the loss of the terminal antenna, and H, A and B are rational numbers, wherein the unit of H and A is dBm, and the unit of B is dB.
In this embodiment, after the terminal determines the manner in which the terminal initiates the access request corresponding to the comparison result, the terminal initiates the access request for accessing the network according to the access manner; in case of access failure, an access request to access the network is initiated again.
In this embodiment, under the condition of the access failure, detecting whether the duration of the access failure is smaller than a preset access failure duration threshold value;
randomly generating a delay time of the access request for reinitiating the access to the network under the condition that the delay time is less than the preset access failure time length threshold value, and reinitiating the access request for accessing the network after the delay time is reached;
and directly initiating the access request for accessing the network again under the condition that the access time length is not less than the preset access failure time length threshold value.
In the above embodiment, the method of reinitiating an access request to the network includes:
and initiating the access request for accessing the network again according to the access collision solution.
In this embodiment, an access processing apparatus of a satellite communication network is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and the description of which has been already made is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
In another embodiment of the present invention, there is further provided an access processing apparatus for a satellite communication network, which is located in a terminal, and fig. 2 is a block diagram of a structure of the access processing apparatus for a satellite communication network according to an embodiment of the present invention, as shown in fig. 2, the apparatus includes:
a measuring module 22, configured to measure a signal-to-noise ratio of forward reception of the terminal accessing the network;
a comparison module 24, connected to the measurement module 22, for comparing the snr with a threshold value of the spread spectrum snr;
a determining module 26, connected to the comparing module 24, for determining a manner in which the terminal corresponding to the comparison result initiates the access request, where the manner includes one of: a spread spectrum access mode and a non-spread spectrum access mode.
By the above-mentioned means, the measuring module 22 measures the signal-to-noise ratio of the forward reception of the terminal access network, the comparing module 24 compares the signal-to-noise ratio with the threshold value of the spread spectrum signal-to-noise ratio, the determining module 26 determines the access request mode initiated by the terminal corresponding to the comparison result,
the problem of resource waste when a spread spectrum modulation code initiates an access request in a satellite communication system is solved, and the utilization rate of system bandwidth is improved.
In this embodiment, the determining module 26 includes one of:
a first access unit, configured to determine, when the signal-to-noise ratio is smaller than the spread spectrum signal-to-noise ratio threshold value, that an access mode initiating an access request is the spread spectrum access mode, where the spread spectrum access mode initiates the access request in a spread spectrum modulation coding mode within a time of a spread spectrum access cycle threshold value;
and a second access unit, configured to determine, when the signal-to-noise ratio is greater than or equal to the spread-spectrum signal-to-noise ratio threshold value, that an access mode initiating an access request is the non-spread-spectrum access mode, where the non-spread-spectrum access mode is to initiate the access request in a non-spread-spectrum modulation coding mode within a time of a non-spread-spectrum access period threshold value.
Fig. 3 is a block diagram of an access processing apparatus of a satellite communication network according to an embodiment of the present invention, and as shown in fig. 3, in addition to the modules of fig. 2, the apparatus further includes:
a receiving module 32, connected to the measuring module 22, configured to receive a super-frame composition table SCT broadcast message before measuring a forward received signal-to-noise ratio of the terminal accessing the network, where the SCT broadcast message carries the spread spectrum signal-to-noise ratio threshold and the spread spectrum access period threshold.
The present invention will be described in detail with reference to preferred examples and embodiments.
In the preferred embodiment of the present invention, how to control the access terminal under different snr conditions to initiate access request using different modulation coding schemes in the fixed access time slot resource is a key problem, and in order to solve the problem, the preferred embodiment of the present invention designs a method for enhancing access in a satellite communication system, where a master station configures information such as a spread spectrum access resource period, a spread spectrum snr threshold, and a fixed access time slot resource, and sends the information to the access terminal via an SCT broadcast message, and the access terminal selects an available access time period, an access coding scheme, an access resource selection, and an access collision solution corresponding to the access scheme according to an accurate measurement forward received snr condition to distinguish the occupation of the access time slot resource by the access terminal under different snr conditions, so as to ensure that the access terminal under high snr conditions can use a faster access system with fewer access time slot resources, namely, the total access number supported by the system under the condition of the same access time slot resource is greatly improved. The preferred embodiment includes the following steps:
step 1, according to DVB-RCS standard protocol, a satellite communication system access network configures a spread spectrum access period, a spread spectrum signal-to-noise ratio threshold and a fixed access time slot resource, and sends the resources to an access terminal through SCT broadcast messages.
And 2, after receiving the SCT message, the access terminal receives the signal-to-noise ratio before accurate measurement and judges the mode of initiating the access request selection by comparing with the threshold of the spread spectrum signal-to-noise ratio.
And 3, if the signal-to-noise ratio received by the access terminal is less than the spread spectrum signal-to-noise ratio threshold, the access terminal initiates an access request by using a spread spectrum modulation coding mode in the spread spectrum period time when initiating the access request.
And 4, if the signal-to-noise ratio received by the access terminal is greater than or equal to the spread spectrum signal-to-noise ratio threshold, the access terminal initiates an access request by using a non-spread spectrum modulation coding mode in a non-spread spectrum period when initiating the access request.
And step 5, if the access fails, continuing to initiate the access again in the corresponding access mode by using an access collision solving mechanism until the access is successful.
Through the steps, the satellite communication system can realize that the access time slot resources are accurately controlled, the access terminal selects a proper access mode through the forward signal noise receiving condition, and the access time slot resources are fully utilized, so that the system can support more access terminals under the condition of the same access time slot resources, and the method is very important for improving the bandwidth utilization rate of the system.
Fig. 4 is a basic processing flow diagram according to a preferred embodiment of the present invention, as shown in fig. 4, a processing flow diagram of the access terminal selecting an access mode according to a forward received signal-to-noise ratio measurement by configuring a spread spectrum signal-to-noise ratio threshold value, a spread spectrum access period, and fixed access slot resource information, and broadcasting to the access terminal through an SCT. The method comprises the following steps:
step S401, an access network starts an enhanced access function;
step S402, the access network configures the SNR threshold value of the spread spectrum mode as 2dBm, the available access period of the spread spectrum mode is 5, the unit thereof is a reverse hyper frame number, the number of resource time slots of the fixed access time slot is 4, and the fixed access time slot is sent to the access terminal through the SCT broadcast message;
step S403, the access terminal receives the SCT broadcast message, acquires the access relevant configuration parameters, and accurately measures the forward receiving signal-to-noise ratio;
step S404, the access terminal selects an access mode, if the received signal-to-noise ratio is larger than 2dBm (the threshold value of the signal-to-noise ratio of the spread spectrum mode), the access mode of the non-spread spectrum mode is selected, the access request occupies 1 time slot for sending, if not, the access mode of the spread spectrum mode is selected, the access request occupies 4 time slots for sending;
step S405, the access terminal judges whether the access terminal is in the access cycle time under the selected access mode, if so, the access terminal initiates the access, and if not, the access terminal waits for the corresponding access available cycle. The access period of the spread spectrum mode is configured to be 5, which indicates that the reverse hyper-frame number is 5X, the time period can send spread spectrum access, X indicates the hyper-frame number, and other times are all used for non-spread spectrum access sending;
step S406, if the access fails, the access terminal randomly generates a delay time for initiating the access request next time through the access collision solution;
step S407, the access terminal reaches the delay time, returns to S404 to repeatedly initiate the access request until the access is successful;
step S408, the access network adds the access function and ends.
Fig. 5 is a flowchart of a reverse interference exception handling process according to a preferred embodiment of the present invention, as shown in fig. 5, which is a processing scenario in an exception situation in a wireless environment according to an embodiment of the present invention, and is a processing flowchart of, if a forward link is normal and a reverse link is poor (e.g., reverse frequency band interference) in an actual application, configuring a spread spectrum signal-to-noise ratio threshold, a spread spectrum access period, fixed access slot resource information, and adding an access failure duration threshold at the same time, broadcasting to an access terminal through an SCT, and the access terminal selecting an access mode according to a forward received signal-to-noise ratio measurement. The method comprises the following steps:
step S501, an access network starts an enhanced access function;
step S502, the access network configures the SNR threshold value of the spread spectrum mode to be 2dBm, the available access period of the spread spectrum mode is 5, the unit of the available access period is reverse hyper frame number, the number of resource time slots of the fixed access time slot is 4, and the fixed access time slot is sent to the access terminal through the SCT broadcast message;
step S503, the access terminal receives the SCT broadcast message, acquires the access relevant configuration parameters, and accurately measures the forward receiving signal-to-noise ratio;
step S504, the access terminal selects the access mode, if the received signal-to-noise ratio is larger than 2dBm (the threshold value of the signal-to-noise ratio of the spread spectrum mode), the access mode of the non-spread spectrum mode is selected, the access request occupies 1 time slot for sending, if not, the access mode of the spread spectrum mode is selected, the access request occupies 4 time slots for sending;
step S505, the access terminal judges whether the access terminal is in the access cycle time under the selected access mode, if so, the access terminal initiates the access, and if not, the access terminal waits for the corresponding access available cycle. The access period of the spread spectrum mode is configured to be 5, which indicates that the reverse hyper-frame number is 5X, the time period can send spread spectrum access, X indicates the hyper-frame number, and other times are all used for non-spread spectrum access sending;
step S506, if the access fails, the access terminal enters an access exception handling unit;
step S507, if the access failure time length is less than the access failure time length threshold, the access terminal randomly generates a delay time for initiating the access request next time through the access collision solution; if not, the access terminal immediately selects the spread spectrum mode to initiate access again.
Step S508, the access terminal delay time is up, return to the unit S504 and initiate the access request repeatedly, until the access succeeds;
step S509, the access network adds the access function and ends.
Fig. 6 is a flow chart of a dynamic adjustment configuration process according to a preferred embodiment of the present invention, as shown in fig. 6, which is a process flow chart of adding a detection spread spectrum access success rate threshold through an access network, dynamically configuring a spread spectrum access period, a fixed spread spectrum signal-to-noise ratio threshold value, and fixed access slot resource information, broadcasting to an access terminal through an SCT, and selecting an access mode by the access terminal according to a forward received signal-to-noise ratio measurement in a dynamic adjustment scenario of a spread spectrum access period in the implementation of the present invention. The method comprises the following steps:
step S601, the access network starts the enhanced access function;
step S602, the access network detects whether the access failure rate in the spread spectrum access period is greater than the spread spectrum access failure rate threshold, if so, the processing is performed in S603, and if not, the processing is performed in the S604 unit;
step S603, the access network adjusts the threshold of the spread spectrum access period, if the current configuration period is 5, the configuration period is adjusted to 4, that is, the available resources for spread spectrum access are increased, because the problem of delay in the effective configuration of the access terminal is involved, appropriate configuration effective synchronization processing needs to be performed, which will not be described in detail herein;
step S604, the access network configures the SNR threshold value of the spread spectrum mode to be 2dBm, the available access period of the spread spectrum mode is 5, the unit of the available access period is reverse hyper frame number, the number of resource time slots of the fixed access time slot is 4, and the fixed access time slot is sent to the access terminal through the SCT broadcast message;
step S605, the access terminal receives the SCT broadcast message, acquires the relevant configuration parameters of the access, and accurately measures the forward receiving signal-to-noise ratio;
step S606, the access terminal selects the access mode, if the received signal-to-noise ratio is larger than 2dBm (the threshold value of the signal-to-noise ratio of the spread spectrum mode), the access mode of the non-spread spectrum mode is selected, the access request occupies 1 time slot for sending, if not, the access mode of the spread spectrum mode is selected, the access request occupies 4 time slots for sending;
step S607, the access terminal determines whether it is within the access cycle time in the selected access mode, if so, initiates access, and if not, waits for the corresponding access available cycle. The access period of the spread spectrum mode is configured to be 5, which indicates that the reverse hyper-frame number is 5X, the time period can send spread spectrum access, X indicates the hyper-frame number, and other times are all used for non-spread spectrum access sending;
step S608, if the access fails, the access terminal randomly generates a delay time for initiating the access request next time through the access collision solution;
step S609, the access terminal reaches the delay time, returns to S604 and repeatedly initiates the access request until the access is successful;
step S610, the access network adds the access function and ends.
Fig. 7 is a processing flow chart of antenna configuration of an access terminal according to a preferred embodiment of the present invention, as shown in fig. 7, for differences of transmitting antennas of the access terminal in the implementation of the present invention, the access terminal may appropriately adjust a received spread spectrum snr threshold according to an antenna type to adapt to changes of an actual application scenario, the spread spectrum snr threshold, a spread spectrum access period, and fixed access slot resource information are mainly configured by an access network, and are broadcasted to the access terminal through an SCT, the access terminal appropriately adjusts the received spread spectrum snr threshold according to a detected antenna type, and then selects an access mode according to a forward received snr measurement. The method comprises the following steps:
step S701, an access network starts an enhanced access function;
step S702, an access network configures a signal-to-noise ratio threshold value of a spread spectrum mode to be 2dBm (conventional antenna type configuration), the available access period of the spread spectrum mode is 5, the unit of the available access period is a reverse hyper frame number, the number of resource time slots of an access time slot is fixed to be 4, and the fixed access time slot is sent to an access terminal through an SCT broadcast message;
step S703, the access terminal receives the SCT broadcast message, acquires the relevant configuration parameters of the access, and accurately measures the forward receiving signal-to-noise ratio;
step S704, the access terminal detects the antenna type (such as the configuration of transmitting power and the like) configured by the terminal, adjusts the threshold value of the spread spectrum signal-to-noise ratio according to the configuration type, adjusts the threshold value of the spread spectrum signal-to-noise ratio to be 1dBm (the threshold value of the received spread spectrum signal-to-noise ratio is 2dBm minus the gain of the large antenna to be 1dB) when the large antenna is configured, and adjusts the threshold value of the spread spectrum signal-to-noise ratio to be 3dBm (the threshold value of the received spread spectrum signal-to;
step S705, the access terminal selects an access mode, if the received signal-to-noise ratio is larger than 2dBm (the signal-to-noise ratio threshold value of the spread spectrum mode), the access mode of the non-spread spectrum mode is selected, the access request occupies 1 time slot for sending, if not, the access mode of the spread spectrum mode is selected, the access request occupies 4 time slots for sending;
step S706, the access terminal judges whether it is in the access cycle time under the selected access mode, if yes, initiates access, and if not, waits for the corresponding access available cycle. The access period of the spread spectrum mode is configured to be 5, which indicates that the reverse hyper-frame number is 5X, the time period can send spread spectrum access, X indicates the hyper-frame number, and other times are all used for non-spread spectrum access sending;
step S707, if the access fails, the access terminal randomly generates a delay time for initiating the access request next time through the access collision solution;
step S708, the access terminal reaches the delay time, returns to S704 to initiate the access request again until the access is successful;
step S709, the access network adds the access function and ends.
In the embodiment of the invention, a method for enhancing the access of a satellite communication system is designed by combining a DVB-RCS standard protocol and a wireless communication principle. Aiming at the characteristics of long link distance, large propagation delay, large link loss, large coverage range, limited bandwidth resources and the like of a satellite communication system, the system has very high performance requirements on an access terminal access system, and the access method ensures that the satellite access terminal uses the minimum access resource access system under different geographical coverage signal-noise conditions, improves the success rate of system access, can improve the reliability of system application, and can fully utilize the access bandwidth resources.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.
The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the storage medium may be configured to store program codes for executing the method steps of the above embodiment:
optionally, the storage medium is further arranged to store program code for performing the method steps of the above embodiments:
optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Optionally, in this embodiment, the processor executes the method steps of the above embodiments according to the program code stored in the storage medium.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An access processing method for a satellite communication network, comprising:
the terminal measures the signal-to-noise ratio of forward reception of the terminal access network;
the terminal compares the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value;
before the terminal compares the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value according to the signal-to-noise ratio, the method further comprises the following steps:
the terminal adjusts the spread spectrum signal-to-noise ratio threshold value according to the antenna type configured by the terminal, wherein the manner of adjusting the spread spectrum signal-to-noise ratio threshold value comprises: h is A-B;
h is the adjusted spreading signal-to-noise ratio threshold value, A is the spreading signal-to-noise ratio threshold value before adjustment, B is the loss of the terminal antenna, and H, A and B are rational numbers, wherein the unit of H and A is dBm, and the unit of B is dB;
the terminal determines a mode of initiating an access request by the terminal corresponding to the comparison result, wherein the mode includes one of the following modes: a spread spectrum access mode and a non-spread spectrum access mode.
2. The method according to claim 1, wherein, according to the comparison result, the manner in which the terminal determines that the terminal corresponding to the comparison result initiates the access request comprises one of:
under the condition that the signal-to-noise ratio is smaller than the spread spectrum signal-to-noise ratio threshold value, the terminal determines that an access mode for initiating an access request is the spread spectrum access mode, wherein the spread spectrum access mode is to initiate the access request through a spread spectrum modulation coding mode within the time of a spread spectrum access period threshold value;
and under the condition that the signal-to-noise ratio is greater than or equal to the spread spectrum signal-to-noise ratio threshold value, the terminal determines that the access mode for initiating the access request is the non-spread spectrum access mode, wherein the non-spread spectrum access mode initiates the access request through a non-spread spectrum modulation coding mode within the time of a non-spread spectrum access period threshold value.
3. The method of claim 2, wherein the terminal measures a signal-to-noise ratio of forward reception of the terminal access network before the terminal measures the signal-to-noise ratio, comprising,
and the terminal receives a super frame composition table (SCT) broadcast message, wherein the SCT broadcast message carries the spread spectrum signal-to-noise ratio threshold value and the spread spectrum access period threshold value.
4. The method of claim 3, wherein before the terminal receives the SCT broadcast message, the method further comprises:
and the access network detects the failure times of the terminal accessing the network within the time indicated by the spread spectrum access period threshold value, and reduces the spread spectrum access period threshold value under the condition that the failure times are greater than a preset spread spectrum failure rate threshold value.
5. The method of claim 1, wherein after the terminal determines a manner in which the terminal initiates the access request corresponding to the comparison result, the method further comprises,
the terminal initiates an access request for accessing the network according to the access mode;
and in case of access failure, initiating an access request for accessing the network again.
6. The method of claim 5,
under the condition of the access failure, detecting whether the duration of the access failure is smaller than a preset access failure duration threshold value or not;
randomly generating a delay time of the access request for reinitiating the access to the network under the condition that the delay time is smaller than the preset access failure time length threshold value, and reinitiating the access request for accessing the network after the delay time is reached;
and directly initiating the access request for accessing the network again under the condition that the access time length is not less than the preset access failure time length threshold value.
7. The method of claim 5 or 6, wherein the method of reinitiating the access request to the network comprises:
and initiating an access request for accessing the network again according to the access collision solution.
8. An access processing device of a satellite communication network, located in a terminal, comprising:
the measurement module is used for measuring the signal-to-noise ratio of the forward reception of the terminal access network;
the comparison module is used for comparing the signal-to-noise ratio with a spread spectrum signal-to-noise ratio threshold value;
a determining module, configured to determine a manner in which the terminal corresponding to the comparison result initiates an access request, where the manner includes one of: a spread spectrum access mode and a non-spread spectrum access mode;
wherein the apparatus is further configured to: before the terminal compares the snr with a spread spectrum snr threshold, the terminal adjusts the spread spectrum snr threshold according to an antenna type configured by the terminal, wherein the adjusting the spread spectrum snr threshold includes: h is A-B;
h is the adjusted threshold value of the spread spectrum signal-to-noise ratio, A is the threshold value of the spread spectrum signal-to-noise ratio before adjustment, B is the loss of the terminal antenna, and H, A and B are rational numbers, wherein the unit of H and A is dBm, and the unit of B is dB.
9. The apparatus of claim 8, wherein the determining module comprises one of:
a first access unit, configured to determine, when the signal-to-noise ratio is smaller than the spread spectrum signal-to-noise ratio threshold value, that an access manner initiating an access request is the spread spectrum access manner, where the spread spectrum access manner is to initiate the access request in a spread spectrum modulation coding manner within a time of a spread spectrum access period threshold value;
a second access unit, configured to determine, when the signal-to-noise ratio is greater than or equal to the spread-spectrum signal-to-noise ratio threshold, that an access manner initiating an access request is the non-spread-spectrum access manner, where the non-spread-spectrum access manner is to initiate the access request in a non-spread-spectrum modulation coding manner within a time of a non-spread-spectrum access period threshold.
10. The apparatus of claim 9, further comprising:
a receiving module, configured to receive a super-frame composition table SCT broadcast message before measuring a forward received signal-to-noise ratio of the terminal accessing a network, where the SCT broadcast message carries the spread spectrum signal-to-noise ratio threshold and the spread spectrum access period threshold.
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| CN201510993318.9A CN106921427B (en) | 2015-12-25 | 2015-12-25 | Access processing method and device for satellite communication network |
| PCT/CN2016/098870 WO2017107583A1 (en) | 2015-12-25 | 2016-09-13 | Access processing method and device for satellite communication network |
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| CN201510993318.9A CN106921427B (en) | 2015-12-25 | 2015-12-25 | Access processing method and device for satellite communication network |
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| CN109561509B (en) * | 2017-09-25 | 2023-04-07 | 中兴通讯股份有限公司 | Method and device for reverse resource allocation of wireless communication system |
| CN110048801A (en) * | 2018-01-16 | 2019-07-23 | 中兴通讯股份有限公司 | A kind of data transmission method and device |
| CN108957489B (en) * | 2018-05-29 | 2022-04-05 | 中国科学院光电研究院 | Ground test verification system and method for low-earth-orbit satellite navigation enhancement signals |
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