CN108401299B - Method and system for realizing uplink service, master station and end station - Google Patents
Method and system for realizing uplink service, master station and end station Download PDFInfo
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- CN108401299B CN108401299B CN201710069635.0A CN201710069635A CN108401299B CN 108401299 B CN108401299 B CN 108401299B CN 201710069635 A CN201710069635 A CN 201710069635A CN 108401299 B CN108401299 B CN 108401299B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Abstract
The embodiment of the invention provides a method and a system for realizing an uplink service, a master station and an end station; the method comprises the following steps: when an end station needs to perform uplink service, an uplink service request is sent to a main station; the master station acquires the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table, and determining the transmission mode of the uplink service corresponding to the uplink service request; allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources; and the end station receives the time frequency resource and the transmission mode and carries out uplink service on the time frequency resource according to the transmission mode. The embodiment of the invention can determine the transmission mode of the end station according to the signal-to-interference-and-noise ratio, so that even if the end station supports the spread spectrum, the spread spectrum is activated only when the channel condition is poor, and the uplink resource can be reasonably applied.
Description
Technical Field
The present invention relates to the field of satellite communications, and in particular, to a method and a system for implementing an uplink service, a master station, and an end station.
Background
In an Interactive Satellite communication System based on a DVB-RCS2(Digital Video Broadcasting-continuous Generation Digital Video Broadcasting System, Digital Video Broadcasting) protocol, an uplink employs an MF-TDMA (Multi-Frequency Time Division Multiple Access) technique, and all end stations share uplink radio link resources.
In the MF-TDMA technique, as shown in fig. 1, an uplink radio link is formed by multiple carriers, each carrier is further divided into multiple BTUs (Bandwidth-Time units, Time-frequency resources), and a BTU is a minimum resource allocation Unit. When an end station needs to upload data and the like to perform uplink service, a bandwidth request needs to be sent to a master station of a network side, the master station of the network side allocates uplink resources for the end station according to the bandwidth request of the end station, and the end station can send the data on the allocated resources after receiving the uplink resources allocated by the master station.
The allocation of uplink resources includes the following contents: 1) distribution of the number of BTUs; 2) allocation of BTU locations; 3) assignment of transport (txtype) used by the BTU. Each txtype includes MCS (Modulation and coding scheme), payload, whether spread spectrum exists, and other contents, the allocation of the transmission mode plays a crucial role in the reliability and effectiveness of the uplink, and for an end station with poor channel conditions or important services, the allocation of a non-spread spectrum transmission mode reduces the reliability of the link and affects the service experience of a user; for an end station with better channel conditions, the resource utilization of the system is reduced by allocating spread spectrum transmission mode.
However, when the existing primary station performs uplink resource allocation, it only focuses on allocation of the number and location of BTUs, which results in that the end station always operates in the supported spreading mode, for example, if the end station supports spreading, the end station always operates in the spreading mode, and when the channel condition is good, the resource utilization rate of the system is reduced.
Disclosure of Invention
The embodiment of the invention provides an uplink service implementation method and system, a main station and an end station, and aims to solve the problem of low time-frequency resource utilization rate caused by the fact that the end station supporting spread spectrum is always in a spread spectrum mode when the prior art carries out uplink service.
In one aspect, a method for implementing an uplink service is provided, including:
receiving an uplink service request from an end station;
acquiring the signal-to-interference-and-noise ratio of a reverse signal of an end station and the spread spectrum capability level of the end station;
calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of the uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor;
allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources;
and sending the time-frequency resource and the transmission mode to the end station.
In one aspect, a method for implementing an uplink service is provided, including:
when an uplink service is required to be carried out, an uplink service request is sent to a main station;
receiving a time-frequency resource and a transmission mode which are returned by a master station and allocated for an uplink service, wherein the transmission mode comprises a spread spectrum factor;
performing uplink service on time-frequency resources according to transmission mode
In one aspect, a method for implementing an uplink service is provided, including:
when an end station needs to perform uplink service, an uplink service request is sent to a main station;
the main station receives the uplink service request, and acquires the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of the uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources; sending the time-frequency resource and the transmission mode to an end station;
and the end station receives the time frequency resource and the transmission mode and carries out uplink service on the time frequency resource according to the transmission mode.
In one aspect, a master station is provided, comprising: a communication module, an acquisition module, and a distribution module, wherein,
the communication module is used for receiving an uplink service request from an end station;
the acquisition module is used for acquiring the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station;
the distribution module is used for calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of the uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources;
the communication module is also used for sending the time frequency resource and the transmission mode to the end station.
In one aspect, an end station is provided, comprising: a request module and a service module, wherein,
the request module is used for sending an uplink service request to the main station when the uplink service is required to be carried out; receiving a time-frequency resource and a transmission mode which are returned by a master station and allocated for an uplink service, wherein the transmission mode comprises a spread spectrum factor;
and the service module is used for performing uplink service on the time-frequency resource according to the transmission mode.
In one aspect, a system for implementing an uplink service is provided, including: an end station and a master station, wherein,
the end station is used for sending an uplink service request to the main station when the uplink service is required to be carried out;
the main station is used for receiving the uplink service request, and acquiring the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of the uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources; sending the time-frequency resource and the transmission mode to an end station;
the end station is also used for receiving the time frequency resource and the transmission mode, and performing uplink service on the time frequency resource according to the transmission mode.
In another aspect, a computer storage medium is provided, where computer-executable instructions are stored in the computer storage medium, and the computer-executable instructions are used to execute the foregoing uplink service implementing method.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method for realizing an uplink service, wherein a main station acquires a signal to interference plus noise ratio (SINR) of an end station when the end station needs to carry out the uplink service, and determines a transmission mode of the end station according to the SINR, so that even if the end station supports a spread spectrum mode, the spread spectrum mode is not activated when the channel condition is determined to be better according to the SINR, and the spread spectrum mode is activated only when the channel condition is poorer, so that uplink resources can be reasonably applied, the problem of low time-frequency resource utilization rate caused by the fact that the end station supporting the spread spectrum is always in the spread spectrum mode when carrying out the uplink service in the prior art is solved, and the use experience of a user is enhanced.
Drawings
Fig. 1 is a schematic distribution diagram of uplink time-frequency resources;
fig. 2 is a flowchart of an uplink service implementation method according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an uplink service implementation system according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a satellite communication system according to a third embodiment of the present invention;
fig. 5 is a flowchart of uplink time-frequency resource allocation according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of time-frequency resource allocation of scenario a according to a third embodiment of the present invention;
fig. 7 is a schematic diagram of time-frequency resource allocation of scenario b according to a third embodiment of the present invention;
fig. 8 is a schematic time-frequency resource allocation diagram of scenario c according to the third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will now be further explained by means of embodiments in conjunction with the accompanying drawings.
The first embodiment:
fig. 2 is a flowchart of an uplink service implementation method according to a first embodiment of the present invention, and as can be seen from fig. 2, the uplink service implementation method according to this embodiment includes:
s101: when an end station needs to perform uplink service, an uplink service request is sent to a main station;
s102: the main station receives the uplink service request, and acquires the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of an uplink service corresponding to an uplink service request, wherein the transmission mode comprises a spread spectrum factor, a modulation coding mode and an effective load; allocating time frequency resources for uplink services according to a transmission mode, such as a spreading factor, a modulation coding mode and an effective load in the transmission mode, and the occupation condition of the current time frequency resources; sending the time-frequency resource and the transmission mode to an end station;
s103: and the end station receives the time frequency resource and the transmission mode and carries out uplink service on the time frequency resource according to the transmission mode.
In practical applications, the Signal to Interference plus Noise ratio SINR is Signal/(Interference + Noise), where Signal refers to the measured power of the useful Signal; interference refers to the measured power of the Interference signal; noise refers to the Noise floor, which is related to the specific measurement bandwidth and the receiver Noise figure.
The SINR of the reverse signal of the end station reflects the channel quality of an uplink channel to a certain extent, so that the SINR of the reverse signal of the end station is creatively introduced into the method, the SINR serves as a basis for a main station to allocate a transmission mode of an uplink service of the end station to the end station, whether the uplink service of the end station is spread or not is related to the current channel quality, the main station acquires the SINR of the end station when the end station needs to perform the uplink service, and determines the transmission mode of the end station according to the SINR, so that even if the end station supports the spread mode, the spread mode is not activated when the channel condition is determined to be better according to the SINR, and the spread mode is activated only when the channel condition is poorer, so that the uplink resource can be reasonably applied, and the problem that the time-frequency resource utilization rate is low because the end station supporting the spread in the prior art is always in the spread mode when performing the uplink service is solved, the use experience of the user is enhanced.
In some embodiments, the implementation of the uplink service implementation method in the embodiment shown in fig. 2 at the primary station side includes:
receiving an uplink service request from an end station; when the uplink service request is received, the terminal station communicating with the master station needs to upload data and the like;
when receiving an uplink service request from an end station, acquiring the signal-to-interference-and-noise ratio of a reverse signal of the end station and the spread spectrum capability level of the end station in real time; in practical application, the acquisition of the SINR of the reverse signal of the end station can be completed through a detection module of the main station, the detection module receives the reverse signal of the end station, and the SINR of the reverse signal of the end station can be obtained through measurement and calculation according to the reverse signal;
calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of the uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor, a modulation coding mode and an effective load; the transmission mode definition table is a new standard table provided in this embodiment, and can be modified as needed in practical application;
allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources;
and sending the time-frequency resource and the transmission mode to the end station.
In some embodiments, the method for implementing an uplink service in the foregoing embodiments, after determining a transmission mode of an uplink service corresponding to the uplink service request, and before allocating time-frequency resources to the uplink service, further includes:
acquiring the service type of an uplink service and/or the current uplink time-frequency resource utilization rate; the service type can be uploading pictures, voice, control signaling and the like, different service types have different requirements on the error rate and the time delay, for example, when the control signaling is uploaded, the requirements on the error rate and the time delay are very high, a more conservative sending mode needs to be adopted, the method is suitable for entering a spread spectrum mode, and correspondingly, when data such as text pictures and the like are uploaded, a non-spread spectrum mode can be used; the uplink time frequency resource utilization rate refers to the percentage of the number of all occupied time frequency resources to the total number of the total time frequency resources, and when the uplink time frequency resource utilization rate is very low, a spread spectrum mode can be properly allocated to the end station supporting the spread spectrum mode so as to increase the reliability of uplink service transmission;
correcting the transmission mode according to the service type and/or the uplink time-frequency resource utilization rate;
at this time, allocating the time-frequency resource for the uplink service includes:
and distributing the time frequency resources for the uplink service according to the corrected transmission mode and the occupation condition of the current time frequency resources, so that the reasonable utilization of the time frequency resources can be realized.
In some embodiments, the allocating time-frequency resources for uplink traffic in the foregoing embodiments includes:
determining a spreading factor according to a transmission mode;
determining the number of time-frequency resources needing to be allocated to the uplink service according to the spread spectrum factor;
selecting a corresponding number of time-frequency resources from all currently idle uplink time-frequency resources;
and taking the selected time frequency resource as the time frequency resource of the uplink service.
In the new spreading mode provided in this embodiment, specifically, in the time-frequency resource diagram shown in fig. 1, the existing spreading mode is as follows: setting the bandwidth of carrier 0 to be 0.5MHz, the bandwidth of carrier 1 to be 2MHz, and the bandwidth of carrier 2 to be 4MHz, if end station a does not support spreading (spreading factor SF ═ 1), allocating time-frequency resources on carrier 0 (BTU0-BTU9) to it, if end station B supports spreading (spreading factor SF ═ 4), allocating time-frequency resources on carrier 1 (BTU10-BTU19) to it, and correspondingly, if end station C supports spreading (spreading factor SF ═ 8), allocating time-frequency resources on carrier 2 (BTU20-BTU29) to it, and this way of implementing spreading needs to partition the time-frequency resources on each carrier at fixed points, and the same time-frequency resource cannot be multiplexed by end stations with different spreading factors. The spread spectrum method provided by the present application implements spread spectrum by allocating multiple time-frequency resources BTUs for the same service, as shown in fig. 6, the end station 1 enters a "spread spectrum mode", and 100 bytes of data are respectively sent at BTUs 0-BTUs 3 and BTUs 4-BTUs 7 using txtype3, and 200 bytes of data are sent in total; the end station 2 exits the "spread mode", and 50 bytes of data are transmitted using txtype4 in each of BTU8, BTU9, BTU10, and BTU11, and a total of 200 bytes of data are transmitted.
In some embodiments, the implementation of the uplink service implementation method in the embodiment shown in fig. 2 at the end station side includes:
when an uplink service is required to be carried out, an uplink service request is sent to a main station;
receiving time-frequency resources and transmission modes which are distributed for uplink services and returned by a master station, wherein the transmission modes comprise spreading factors, modulation coding modes and effective loads;
and performing uplink service on the time-frequency resource according to the transmission mode.
In some embodiments, the uplink service request carries a service type and a data size, which is used by the master station to modify the transmission mode.
Second embodiment:
fig. 3 is a schematic structural diagram of an uplink service implementation system according to a second embodiment of the present invention, and as shown in fig. 3, the uplink service implementation system according to this embodiment includes: an end station 1 and a master station 2, wherein,
the end station 1 is used for sending an uplink service request to the main station 2 when uplink service is required to be performed;
the main station 2 is used for receiving the uplink service request, and acquiring the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of the uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor, a modulation coding mode and an effective load; allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources; sending time frequency resources and a transmission mode to the end station 1;
the end station 1 is further configured to receive a time-frequency resource and a transmission mode, and perform an uplink service on the time-frequency resource according to the transmission mode.
In some embodiments, as shown in fig. 3, the primary station 2 in the above embodiments comprises: a communication module 21, an acquisition module 22 and an allocation module 23, wherein,
the communication module 21 is configured to receive an uplink service request from an end station;
the obtaining module 22 is configured to obtain a signal-to-interference-and-noise ratio of a reverse signal of the end station and a spreading capability level of the end station;
the allocation module 23 is configured to invoke a transmission mode definition table according to the sir and the spreading capability level, and determine a transmission mode of an uplink service corresponding to the uplink service request; allocating time frequency resources for uplink service according to the transmission mode and the occupation condition of the current time frequency resources;
the communication module 21 is further configured to send time-frequency resources and transmission modes to the end station.
In some embodiments, the obtaining module 22 in the foregoing embodiments is further configured to obtain a service type of an uplink service, and/or a current uplink time-frequency resource utilization rate; after determining the transmission mode of the uplink service corresponding to the uplink service request and before allocating the time-frequency resource to the uplink service, the allocating module 23 is further configured to modify the transmission mode according to the service type and/or the uplink time-frequency resource utilization rate, and allocate the time-frequency resource to the uplink service according to the modified transmission mode.
In some embodiments, the allocating module 23 in the above embodiments is configured to determine a spreading factor according to a transmission mode; determining the number of time-frequency resources needing to be allocated to the uplink service according to the spread spectrum factor; selecting a corresponding number of time-frequency resources from all currently idle uplink time-frequency resources; and taking the selected time frequency resource as the time frequency resource of the uplink service.
In some embodiments, as shown in fig. 3, the end station 1 in the above embodiments includes: a request module 11 and a service module 12, wherein,
the request module 11 is configured to send an uplink service request to the master station when an uplink service needs to be performed; receiving a time-frequency resource and a transmission mode which are returned by a master station and allocated for an uplink service;
the service module 12 is configured to perform an uplink service on the time-frequency resource according to the transmission mode.
In practical applications, all the functional modules in the embodiment shown in fig. 3 may be implemented by using a processor, an editing logic device, or the like.
The third embodiment:
as shown in fig. 4, in the present embodiment, a satellite communication system including 1 master station and 2 end stations (end station a and end station B) is taken as an example to further explain the present invention with reference to a specific application scenario.
The technical problem to be solved by the invention is as follows: a resource allocation method and device in an MF-TDMA satellite system are provided to improve the reliability and effectiveness of uplink transmission.
Specifically, as shown in fig. 5, the method for dynamically scheduling uplink resources provided in this embodiment includes the following steps:
s501: when the preset entering condition is met, the master station informs the end station to enter a 'spread spectrum mode'. And when the preset exit condition is met, the master station informs the end station to exit the spread spectrum mode.
The master station can set the end stations to enter or exit the "spread spectrum mode" by monitoring the following parameters: the parameters comprise calculation parameters and correction parameters, wherein the calculation parameters comprise Signal to Interference plus Noise Ratio (SINR) of reverse signals of the end station and the spreading capacity level of the end station, and the correction parameters comprise service types of the end station and the utilization rate of uplink resources of a communication network.
The master station can inform the end stations to enter or exit "spread spectrum mode" by sending txtype to the end stations. Wherein txtype includes, but is not limited to, the following parameters: spreading Factor (SF): the number of BTUs occupied by each physical signal, Modulation and Coding Scheme (MCS), payload: the amount of useful information data that can be transmitted per physical signal.
If the SF corresponding to the txtype sent by the master station to the end station is larger than 1, the end station is informed to enter the 'spread spectrum mode', and if the SF corresponding to the txtype sent is equal to 1, the end station is informed to exit the 'spread spectrum mode'.
S502: when the end station receives the notice of entering the 'spread spectrum mode', the end station transmits signals by using the spread spectrum mode at the allocated resource position; when the end station receives the notice of exiting the 'spread spectrum mode', the end station transmits signals by using a non-spread spectrum mode at the allocated resource position;
after entering a 'spread spectrum mode', an end station uses SF (SF >1) BTUs to transmit 1 physical signal; after the end station exits the "spread spectrum mode", 1 physical signal is transmitted using SF (SF ═ 1) BTUs.
In this embodiment, the master station notifies the end station to enter or exit the "spread spectrum mode" according to a preset condition, and after receiving the notification from the master station, the end station transmits a signal in the allocated resource location using the spread spectrum mode or the non-spread spectrum mode. Compared with the prior art, the method improves the reliability and the effectiveness of the uplink transmission of the satellite communication system based on the MF-TDMA technology.
Scene a:
there are two end stations, end station a and end station B, in the communication network, and the information of the end stations is shown in table 1 below:
TABLE 1
The transmission mode definition table stored by the primary station is shown in table 2 below:
TABLE 2
The master station determines that an end station enters or exits the 'spread spectrum mode' by monitoring the end station reverse signal SINR and the end station spread spectrum capability level.
The end station a uploads 200 bytes, and as can be seen from table 1, the SINR of the end station a is 2dB, and as can be seen from table 2, the demodulation threshold 1dB of txtype3 < SINR of the end station a < demodulation threshold 3.5dB of txtype4, and the maximum SF supported by the end station is 8, so the master station allocates txtype3 to the end station a, and the end station a enters "spread spectrum mode".
The end station B uploads 200byte words, and as can be seen from table 1, the SINR of the end station B is 2dB, and as can be seen from table 2, the demodulation threshold 1dB of txtype3 < SINR of the end station B < 3.5dB of txtype4, but the maximum SF supported by the end station B is 1. The master station cannot allocate txtype3 with SF of 4 to end station B, and only txtype4 with SF of 1 (the block error rate does not reach 10^ (-5) requirement), and end station B exits "spread spectrum mode".
At this time, as shown in fig. 6, the end station a enters the "spread mode", and 100 bytes of data are transmitted using txtype3 in each of BTU0-BTU3 and BTU4-BTU7, and a total of 200 bytes of data are transmitted; the end station B exits the "spread mode", and 50 bytes of data are transmitted using txtype4 in each of BTU8, BTU9, BTU10, and BTU11, for a total of 200 bytes of data.
In this embodiment, the end station supporting the spreading mode enters the "spreading mode" to be beneficial to improving the reliability of uplink transmission. And the end station which does not support the spread spectrum can not enter the spread spectrum mode, and the reliability of the uplink transmission can not be ensured.
Scene b
There are 1 end station in the network to perform two services simultaneously, and the information of the end station a is shown in table 3 below:
TABLE 3
In this embodiment, the master station determines that the end station enters or exits the "spread spectrum mode" by monitoring the end station reverse signal SINR, the end station spread spectrum capability level, and the end station service type.
As can be seen from table 3, the SINR of the end station a is 4dB, and from table 2, the demodulation threshold of txtype4 is 3.5dB < SINR of the end station a < 7dB of the demodulation threshold of txtype5, and the maximum SF supported by the end station is 8. Therefore, the maximum txtype available to the end station is txtype 4.
The service 1 of the end station A is an upload text which belongs to a common service, so that the main station distributes the maximum txtype4 which can be supported by the reverse SINR of the end station to the service 1 of the end station. Traffic 1 does not use "spread mode" since txtype4 corresponds to SF 1;
As shown in fig. 7, end station a exits "spread mode" at BTU0, BTU1, BTU2, BTU3, and uploads text using txtype 4; the "spread mode" is entered at BTU4-BTU7, and the control signaling is sent using txtype 3.
In the embodiment, the control signaling is sent by using a spread spectrum mode, so that the reliability of signaling transmission is improved.
Scene c
Only 1 end station in the network is in service, and the information of the end station a is shown in table 4 below:
TABLE 4
In this embodiment, the master station determines that the end station enters or exits the "spread spectrum mode" by monitoring the end station reverse signal SINR, the end station spread spectrum capability level, the end station service type, and the network uplink resource utilization rate.
From table 4, the SINR of end station a is 4dB, from table 2, the demodulation threshold of txtype4 is 3.5dB < SINR of end station a < demodulation threshold of txtype5 is 7dB, and the maximum SF supported by the end station is 8. Therefore, the maximum txtype available to the end station is txtype 4.
The master station counts that the uplink resource utilization rate in the last 1 minute of the network is lower than 20%, and corrects the txtype actually allocated by the end station according to the following table 5: txtype4 is dropped by 1 level to txtype3 to reduce the block error rate of the traffic. Since txtype3 corresponds to SF 4, end station a adopts "spread spectrum mode".
TABLE 5
| Network uplink resource utilization | txtype descending level N |
| [0,30％) | 1 |
| [30％,100％] | 0 |
As shown in fig. 8, end station a enters "spread mode" at BTU0-BTU3 and uploads text using txtype 3.
In the embodiment, when the network load is relatively low, the uplink transmission is performed by using the 'spread spectrum mode', which is beneficial to improving the reliability of transmission.
In summary, the implementation of the embodiment of the present invention has at least the following advantages:
the main station obtains the SINR of the end station when the end station needs to perform uplink service, and determines the transmission mode of the end station according to the SINR, so that even if the end station supports the spread spectrum mode, when the channel condition is determined to be better according to the SINR, the spread spectrum mode is not activated, and only when the channel condition is poorer, the spread spectrum mode is activated, so that uplink resources can be reasonably applied, the problem of low time-frequency resource utilization rate caused by the fact that the end station supporting the spread spectrum is always in the spread spectrum mode when performing the uplink service in the prior art is solved, and the use experience of users is enhanced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above embodiments are only examples of the present invention, and are not intended to limit the present invention in any way, and any simple modification, equivalent change, combination or modification made by the technical essence of the present invention to the above embodiments still fall within the protection scope of the technical solution of the present invention.
Claims (11)
1. A method for realizing uplink service includes:
receiving an uplink service request from an end station;
acquiring the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station;
calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of an uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor;
allocating time frequency resources for the uplink service according to the transmission mode and the occupation condition of the current time frequency resources;
and sending the time frequency resource and the transmission mode to the end station.
2. The method for implementing uplink service according to claim 1, wherein after determining the transmission mode of the uplink service corresponding to the uplink service request, before allocating time-frequency resources to the uplink service, the method further comprises:
acquiring the service type of the uplink service and/or the current uplink time-frequency resource utilization rate;
correcting the transmission mode according to the service type and/or the uplink time-frequency resource utilization rate;
the allocating time-frequency resources for the uplink service includes: and allocating time frequency resources for the uplink service according to the corrected transmission mode and the occupation condition of the current time frequency resources.
3. The method as claimed in claim 1 or 2, wherein said allocating time-frequency resources for the uplink service comprises:
determining the spreading factor according to the transmission mode;
determining the number of time-frequency resources needing to be allocated to the uplink service according to the spread spectrum factor;
selecting a corresponding number of time-frequency resources from all currently idle uplink time-frequency resources;
and using the selected time frequency resource as the time frequency resource of the uplink service.
4. A method for realizing uplink service includes:
when an uplink service is required to be carried out, an uplink service request is sent to a main station, so that the main station receives the uplink service request, and the signal-to-interference-and-noise ratio of a reverse signal of an end station and the spread spectrum capability level of the end station are obtained; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of an uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for the uplink service according to the transmission mode and the occupation condition of the current time frequency resources;
receiving a time-frequency resource and a transmission mode which are returned by the master station and allocated to the uplink service, wherein the transmission mode comprises a spread spectrum factor;
and performing the uplink service on the time frequency resource according to the transmission mode.
5. The method of claim 4, wherein the uplink service request carries a service type and a data size.
6. A method for realizing uplink service includes:
when an end station needs to perform uplink service, an uplink service request is sent to a main station;
the master station receives the uplink service request, and acquires the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of an uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for the uplink service according to the transmission mode and the occupation condition of the current time frequency resources; sending the time frequency resource and the transmission mode to the end station;
and the end station receives the time frequency resource and the transmission mode, and performs the uplink service on the time frequency resource according to the transmission mode.
7. A master station, comprising: a communication module, an acquisition module, and a distribution module, wherein,
the communication module is used for receiving an uplink service request from an end station;
the acquisition module is used for acquiring the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station;
the allocation module is used for calling a transmission mode definition table according to the SINR and the spread spectrum capability level, and determining a transmission mode of an uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for the uplink service according to the transmission mode and the occupation condition of the current time frequency resources;
the communication module is further configured to send the time-frequency resource and the transmission mode to the end station.
8. The master station of claim 7, wherein the obtaining module is further configured to obtain a service type of the uplink service and/or a current uplink time-frequency resource utilization rate; after determining the transmission mode of the uplink service corresponding to the uplink service request and before allocating time-frequency resources to the uplink service, the allocation module is further configured to modify the transmission mode according to the service type and/or the uplink time-frequency resource utilization rate, and allocate time-frequency resources to the uplink service according to the modified transmission mode and the occupation condition of the current time-frequency resources.
9. The primary station of claim 7 or 8, wherein the allocation module is configured to determine the spreading factor based on the transmission mode; determining the number of time-frequency resources needing to be allocated to the uplink service according to the spread spectrum factor; selecting a corresponding number of time-frequency resources from all currently idle uplink time-frequency resources; and using the selected time frequency resource as the time frequency resource of the uplink service.
10. An end station, comprising: a request module and a service module, wherein,
the request module is used for sending an uplink service request to a main station when uplink service is required to be carried out, so that the main station receives the uplink service request, and obtains the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of an uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for the uplink service according to the transmission mode and the occupation condition of the current time frequency resources; receiving a time-frequency resource and a transmission mode which are returned by the master station and allocated to the uplink service, wherein the transmission mode comprises a spread spectrum factor;
and the service module is used for performing the uplink service on the time-frequency resource according to the transmission mode.
11. An uplink service implementation system, comprising: an end station and a master station, wherein,
the end station is used for sending an uplink service request to the main station when uplink service is required to be carried out;
the main station is used for receiving the uplink service request, and acquiring the signal-to-interference-and-noise ratio of the reverse signal of the end station and the spread spectrum capability level of the end station; calling a transmission mode definition table according to the signal-to-interference-and-noise ratio and the spread spectrum capability level, and determining a transmission mode of an uplink service corresponding to the uplink service request, wherein the transmission mode comprises a spread spectrum factor; allocating time frequency resources for the uplink service according to the transmission mode and the occupation condition of the current time frequency resources; sending the time frequency resource and the transmission mode to the end station;
and the end station is also used for receiving the time frequency resource and the transmission mode, and performing the uplink service on the time frequency resource according to the transmission mode.
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| CN109639470B (en) * | 2018-11-30 | 2021-10-15 | 四川安迪科技实业有限公司 | VSAT satellite communication system bandwidth allocation method based on star networking |
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