CN107124726A - Multi-beam GEO system access control methods based on maximize handling capacity - Google Patents

Multi-beam GEO system access control methods based on maximize handling capacity Download PDF

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CN107124726A
CN107124726A CN201710290952.5A CN201710290952A CN107124726A CN 107124726 A CN107124726 A CN 107124726A CN 201710290952 A CN201710290952 A CN 201710290952A CN 107124726 A CN107124726 A CN 107124726A
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wave beam
msub
mrow
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call request
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CN107124726B (en
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崔高峰
李鹏绪
于佳伟
马吟龙
李秀华
王卫东
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Beijing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of multi-beam GEO system access control methods based on maximize handling capacity, belong to satellite communication RRM field；Specially：GEO satellite system is under current frequency duplex factor as one, and the call request searching for certain user meets channel condition and the wave beam of propagation delay time；The total throughout of user system under each wave beam is calculated respectively；The user is linked into corresponding wave beam by selection maximum；All new users are all linked into corresponding wave beam, the total throughout sum of now system is calculated；Then, next frequency duplex factor as one is selected, overall system throughput sum of all users under this frequency duplex factor as one is computed repeatedly；The maximum in whole total throughout sums is selected, then the frequency duplex factor as one of system and user mode access are determined.The present invention considers path loss, arrival rate of customers and frequency duplex factor as one, in the case where meeting propagation delay time threshold value, maximum system throughput.

Description

Multi-beam GEO system access control methods based on maximize handling capacity
Technical field
It is specifically a kind of based on many of maximize handling capacity the present invention relates to satellite communication radio resource management techniques field Wave beam GEO system access control methods.
Background technology
Although development in science and technology is maked rapid progress, land mobile communication system is also gradually improved；But, limited by geographical conditions The restriction of system and the condition such as global economic development is unbalanced, land mobile communication system has on the problem of realizing Global coverage It is a little unable to do what one wishes；For example, China is with a varied topography, mountain area, hilly country are more, it is difficult to complete these regional GCS Ground Communication Systems Networking works；Occupy the difficult point that sphere area more than half ocean in ground is also land mobile communication covering；In recent years natural calamity frequency Hair, the network equipment of land mobile communication system is highly prone to the influence of natural calamity and paralyses, influence it is follow-up combat a natural disaster rescue Activity；Military field is for the required precision also more and more higher of communication, and the security in IT-based warfare for communication is also more next More pay attention to, land mobile communication system equipment can not meet the demand of the military due to easily being destroyed by enemy；Especially aviation The development of aerospace industry, ground communication net is even more that its coverage can not be extended into deep space.Now, satellite mobile communication system The attention of scientists from all over the world has been obtained, has become the study hotspot of moving communicating field.
Satellite communication system, refers to be used as relaying by the use of being distributed in not co-orbital artificial earth satellite instead of ground base station Stand, by radio wave is forwarded, amplified or the mode such as on-board processing so realize two or more earth stations it Between an emerging wireless communication system being communicated, its radio wave frequency used is microwave frequency band, i.e. frequency is 300MHz-300Ghz, wavelength is about 1mm-1m.
In recent years, satellite communication system is mutually tied with present mobile communication technology and aeronautical and space technology more and more Close, but also expose some problems：GEO satellite communication system for employing multibeam technique, in GEO systems, GEO is defended Star has bigger coverage, in addition, in order to improve spectrum efficiency, satellite system employs satellite multi-beam more and more Technology.But it is due to orbit altitude, brings high time delay；In addition, with the access of user, the increase of co-channel interference noise The size of Signal to Interference plus Noise Ratio can be influenceed, further the propagation delay time of influence system.It is therefore desirable to according to the type of service of user, no Loading condition and channel quality with wave beam etc. formulate rational Access Control Policy to ensure the delay requirement of user.With this Meanwhile, GEO satellite cost is high, scarcity of resources on the star such as bandwidth, power, how to be also reasonably access control using resource on star System strategy needs one of factor considered.
GEO satellite system provides synchronous service for the whole world, and it can expand ground communication area, provide and connect for Global Subscriber Enter service, be the important component in communication system.However, due to resource on the star such as on-board processing ability and bandwidth, power Finiteness, in some scenes, satellite system can not probably meet the access demand of a large number of users, and this may make to exhale Blocking rate (Call Blocking Probability, CBP) is made to raise, so that it cannot be guaranteed that QoS (the Quality of of user Service, service quality).Secondly, distance is very long between GEO satellite and user, when the path loss produced during communication and transmission Prolonging to be ignored.
In summary, how to mitigate the influence of path loss and propagation delay time, maximize satellite system handling capacity and resource Utilization rate is to ensure the service quality of user, the subject matter in being designed as access strategy.
The content of the invention
The present invention maximizes resource utilization ratio on the premise of user access request is ensured, provides the user higher Service quality；Propose a kind of multi-beam GEO system access control strategies based on maximize handling capacity.
Comprise the following steps that：
Step 1: for the call request queue of the new user of M, GEO satellite system current fixed frequency multiplexing because Under son, call request is received successively, and the number of channel needed according to active user is found and meets Cio≤CiaWave beam；
CiaFor the number of available channels of wave beam；CioThe number of channel needed when being initiated for the call request of current new user；
The call request initial value of active user is 1；C is met in GEO satellite systemio≤CiaWave beam sum to be N number of；
Step 2: N number of wave beam for meeting condition, calculates the signal to noise ratio that each wave beam receives active user respectively SINR；
The signal to noise ratio SINR during call request of active user is received for i-th of wave beamiIt is calculated as follows：
SiIt is signal power when active user accesses i-th of wave beam；IiIt is the power of interference signal in i-th of wave beam, Ni Represent the noise power of i-th of wave beam.
Step 3: using N number of signal to noise ratio SINR, propagation delay time when active user is respectively connected to each wave beam is calculated, and Select propagation delay time to be less than the wave beam of Time Delay of Systems threshold tau, into step 4, otherwise, refuse the access of new user；
The user accesses the propagation delay time D of i-th of wave beami：
BiThe bandwidth of i-th of wave beam is represented, C represents user's data volume to be transmitted；
Step 4: active user to be sequentially ingressed into N' wave beam of the condition of satisfaction, the GEO under each wave beam is calculated respectively and is defended The total throughout of star system；
When the user accesses i-th of wave beam, the total throughout T of GEO satellite systemi；
Step 5: value maximum in selecting N' total throughout of the GEO satellite system, this is linked into most by active user It is worth greatly in corresponding wave beam；
Step 6: sequential selection next call is asked, repeat step one arrives step 5, until M call request is whole It is linked into corresponding wave beam, calculates the total throughout sum of now GEO satellite system；
Step 7: selecting next fixed frequency multiplexing factor, repeat step one arrives step 6, calculates the call request team The total throughout sum for the GEO satellite system being listed under the fixed frequency multiplexing factor；
Step 8: until being finished whole fixed frequency multiplexing factors, the maximum in selection total throughout sum is corresponding Frequency duplex factor as one as optimal frequency multiplexing factor, the corresponding wave beam of each call request is used as final access way.
The advantage of the invention is that：
1) a kind of, multi-beam GEO system access control methods based on maximize handling capacity, by consider path loss, Arrival rate of customers and frequency duplex factor as one, in the case where meeting propagation delay time threshold value, maximum system throughput.
2) a kind of, multi-beam GEO system access control methods based on maximize handling capacity, frequency duplex factor as one is at some System performance is greatly affected in scene, is a critically important parameter.Compared with traditional scheme, strategy proposed by the present invention There is more preferable performance in terms of resource utilization is optimized, there is significant effect in terms of maximum system throughput.
Brief description of the drawings
Fig. 1 is the multi-beam GEO satellite model schematic that the present invention is used；
Fig. 2 is the frequency duplex factor as one that 7 different wave beams of frequency are produced in multi-beam GEO satellite system of the present invention；
Fig. 3 is the multi-beam GEO system access control method flow charts of the invention based on maximize handling capacity.
Specific embodiment
The specific implementation method to the present invention is described in detail below in conjunction with the accompanying drawings.
The present invention proposes a kind of multi-beam GEO system access control strategy (A Call based on maximize handling capacity Admission Control Scheme Based on Maximizing Throughput for the Multi-beam GEO Satellite Communication System)；Analysis is modeled to GEO communication systems first, as shown in figure 1, It is a multi-beam GEO satellite, it can provide service for mobile phone, aircraft and car phone etc.；Due to user terminal The randomness that uneven distribution and new calling are produced, the channel condition of each wave beam is different from.Therefore multi-beam GEO systems connect Enter the selection that the subject matter in control strategy is wave beam：Assuming that 1 GEO satellite system there are multiple wave beams, asked when there is new calling When asking, system will be it is determined whether allow new call request to access, if allowing to distribute suitable wave beam for it；And the letter of wave beam Road condition must is fulfilled for the requirement of new call request, while making the throughput-maximized of GEO satellite system.
Multi-beam makes it possible channeling, in the multi-beam GEO satellite system of the present embodiment, it is considered to which frequency is multiple With technology, as shown in Fig. 2 F1 to F7 represents 7 different wave beams of frequency, their frequency duplex factor as one is 3,4 and 7 respectively. On the whole, frequency duplex factor as one is higher, and the availability of frequency spectrum is higher；But, the co-channel interference between adjacent beams can significantly increase Plus, especially beam edge, causing the signal to noise ratio of accessing user can reduce.And when co-channel interference reduction, satellite system can reach To higher total throughout；Therefore an optimal system frequency multiplexing factor is chosen, maximum system throughput is emphasis.
When there is C in GEO satellitetIndividual channel, frequency duplex factor as one isTherefore the channel of each wave beam isThis hair The bright multi-beam GEO system access control strategies based on maximize handling capacity are as follows：
1) GEO satellite system resource allocation situation is calculated in real time and is updated；
2) when there is new user to initiate call request, resource status is first checked for, decides whether to allow calling to access；
If 3) current idle resource enough, calculates the propagation delay time of each wave beam；
The propagation delay time of model root wave beam is calculated first, and the access of new user can bring change to network and channel conditions, from And change propagation delay time；Then the propagation delay time of same frequency wave beam is calculated, due to the difference of channel disturbance, with the signal to noise ratio of frequency wave beam It may be influenceed by new user access, this also makes propagation delay time change.
4) by DiMade comparisons with propagation delay time threshold tau, if Di≤ τ, then carry out next step, otherwise refuses this call request；
5) total throughout of computing systemSelect the wave beam of optimal scheme, it is allowed to user Access；
6) above step is repeated when there is new user's request access.
Comprise the following steps that：
Step 1: for the call request queue of M new users, multi-beam GEO satellite system is in current fixed frequency Under multiplexing factor, call request is received successively, and the number of channel needed according to active user is found and meets Cio≤CiaWave beam；
CiaFor the number of available channels of wave beam；CioThe number of channel needed when being initiated for the call request of current new user；
Call request collection of queues for 1,2 ..., m ... M }；The call request initial value of active user is 1；
C is met in multi-beam GEO satellite systemio≤CiaWave beam sum to be N number of；Letter in multi-beam GEO satellite system Road is CtIndividual, frequency duplex factor as one isTherefore the channel of each wave beam is
Step 2: N number of wave beam for meeting condition, calculates the signal to noise ratio that each wave beam receives active user respectively SINR；
The signal to noise ratio SINR during call request of active user is received for i-th of wave beamiIt is calculated as follows：
SiIt is signal power when active user accesses i-th of wave beam, it is relevant with path loss；IiIt is to do in i-th of wave beam Disturb the power of signal, NiRepresent the noise power of i-th of wave beam.
Step 3: using N number of signal to noise ratio SINR, propagation delay time when active user is respectively connected to each wave beam is calculated, and Select propagation delay time to be less than the wave beam of Time Delay of Systems threshold tau, into step 4, otherwise, refuse the access of new user；
The user accesses the mean transit delay D of i-th of wave beami：
BiThe bandwidth of i-th of wave beam is represented, C represents user's data volume to be transmitted；
Step 4: active user to be sequentially ingressed into N' wave beam of the condition of satisfaction, the GEO under each wave beam is calculated respectively and is defended The total throughout of star system；
Active user meets Cio≤CiaAnd DiI-th of wave beam is linked into after≤τ, the total throughout of GEO satellite system is calculated Ti；
Step 5: value maximum in selecting N' total throughout of the GEO satellite system, this is linked into most by active user It is worth greatly in corresponding wave beam；
As can be seen that the key of maximum system throughput is signal to noise ratio SINR from formula, and SINR can be by same frequency ripple The influence of beam interference；When more user access networks, bigger interference can bring about；Interference increase, SINR will be reduced.Often When there is user to initiate request, the present invention will calculate the SINR of present satellites system resource configuring condition and each wave beam, to select Select optimal wave beam accessing user；The requirement of propagation delay time threshold value is also can take into account simultaneously.
Step 6: sequential selection next call is asked, repeat step one arrives step 5, until M call request is whole It is linked into corresponding wave beam, calculates the total throughout sum of now GEO satellite system；
Step 7: selecting next fixed frequency multiplexing factor, repeat step one arrives step 6, calculates the call request team The total throughout sum for the GEO satellite system being listed under the fixed frequency multiplexing factor；
Step 8: until being finished whole fixed frequency multiplexing factors, the maximum in selection total throughout sum is corresponding Frequency duplex factor as one as optimal frequency multiplexing factor, the corresponding wave beam of each call request is used as final access way.
Under the frequency duplex factor as one of each fixation, the call request of each user, which is linked into GEO satellite system, to be met The different wave beams of condition, cause GEO satellite system to produce different handling capacities, according to each user of handling capacity maximum selection rule Optimal access wave beam；
When the call request queue of the M new users is under fixed frequency duplex factor as one, GEO satellite system is respectively connected to In the optimum beam of system, GEO satellite system is caused to produce optimal total throughout sum.
For different frequency duplex factor as one, the call request queue of the M new users can cause GEO satellite system to produce Different optimal total throughout sums, therefrom selects the optimal total throughout sum of maximum as final access way.

Claims (2)

1. a kind of multi-beam GEO system access control methods based on maximize handling capacity, it is characterised in that specific steps are such as Under：
Step 1: for the call request queue of the new user of M, GEO satellite system under current fixed frequency multiplexing factor, Call request is received successively, and the number of channel needed according to active user is found and meets Cio≤CiaWave beam；
CiaFor the number of available channels of wave beam；CioThe number of channel needed when being initiated for the call request of current new user；
Step 2: N number of wave beam for meeting condition, calculates the signal to noise ratio SINR that each wave beam receives active user respectively；
Step 3: using N number of signal to noise ratio SINR, calculating propagation delay time when active user is respectively connected to each wave beam, and select Propagation delay time is less than the wave beam of Time Delay of Systems threshold tau, into step 4, otherwise, refuses the access of new user；
The user accesses the propagation delay time D of i-th of wave beami：
BiThe bandwidth of i-th of wave beam is represented, C represents user's data volume to be transmitted；SINRiRepresent that i-th of wave beam receives current use The signal to noise ratio during call request at family；
Step 4: active user to be sequentially ingressed into N' wave beam of the condition of satisfaction, the GEO satellite system under each wave beam is calculated respectively The total throughout of system；
When the user accesses i-th of wave beam, the total throughout T of GEO satellite systemi；
<mrow> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>=</mo> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <msup> <mi>N</mi> <mo>&amp;prime;</mo> </msup> </munderover> <msub> <mi>B</mi> <mi>i</mi> </msub> <msub> <mi>log</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <msub> <mi>SINR</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> </mrow>
Step 5: value maximum in selecting N' total throughout of the GEO satellite system, the maximum is linked into by active user In corresponding wave beam；
<mrow> <mi>T</mi> <mo>=</mo> <mi>M</mi> <mi>A</mi> <mi>X</mi> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>B</mi> <mi>i</mi> </msub> <msub> <mi>log</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <msub> <mi>SINR</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> </mrow>
Step 6: sequential selection next call is asked, repeat step one arrives step 5, until M call request is all accessed Into corresponding wave beam, the total throughout sum of now GEO satellite system is calculated；
Step 7: selecting next fixed frequency multiplexing factor, repeat step one arrives step 6, calculates the call request queue and exists The total throughout sum of GEO satellite system under the fixed frequency multiplexing factor；
Step 8: up to the maximum being finished in whole fixed frequency multiplexing factors, selection total throughout sum, corresponding frequency Rate multiplexing factor is as optimal frequency multiplexing factor, and the corresponding wave beam of each call request is used as final access way.
2. a kind of multi-beam GEO system access control methods based on maximize handling capacity as claimed in claim 1, its feature It is, in the step 2, i-th of wave beam receives the signal to noise ratio SINR during call request of active useriIt is calculated as follows：
<mrow> <msub> <mi>SINR</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>S</mi> <mi>i</mi> </msub> <mrow> <msub> <mi>I</mi> <mi>i</mi> </msub> <mo>+</mo> <msub> <mi>N</mi> <mi>i</mi> </msub> </mrow> </mfrac> </mrow>
SiIt is signal power when active user accesses i-th of wave beam；IiIt is the power of interference signal in i-th of wave beam, NiRepresent The noise power of i-th of wave beam.
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