CN104093169A - MAC-TCP cross-layer optimization congestion control method and system - Google Patents
MAC-TCP cross-layer optimization congestion control method and system Download PDFInfo
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- CN104093169A CN104093169A CN201410256848.0A CN201410256848A CN104093169A CN 104093169 A CN104093169 A CN 104093169A CN 201410256848 A CN201410256848 A CN 201410256848A CN 104093169 A CN104093169 A CN 104093169A
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Abstract
The invention discloses an MAC-TCP cross-layer optimization congestion control method and system, and relates to the technical field of wireless satellite communication. The congestion control method comprises: S1, a synchronous satellite determining which mobile terminals generating overtime at a TCP data packet overstocked at an MAC layer of the synchronous satellite, and sending a congestion warning to the corresponding mobile terminals through a gateway; S2, determining whether false overtime exists, if so, executing S3; and S3, the mobile terminals determining whether the false overtime is caused by fading of a user channel, if so, directly adopting a congestion avoiding method until the fading of the user channel ends, and if not, adopting a rapid recovery method first and then adopting the congestion avoiding method. According to the invention, whether the false overtime exists at the mobile terminals is determined, and then the causes of the false overtime are determined, and corresponding processing is performed according to the different causes, such that on the condition that the packet loss ratio is not increased, the influences caused by a time delay are reduced.
Description
Technical field
The present invention relates to radio satellite communication technical field, particularly a kind of MAC-TCP cross-layer optimizing jamming control method and system.
Background technology
Along with formally putting it into commercial operation of land honeycomb 4G technology, current, no matter in academia or industrial quarters, both at home and abroad about all like a raging fire developments of the research of the 5th third generation mobile communication network (5G).And 3G technology in the satellite communication system of introducing in order to make up the problem of terrestrial cellular system coverage is also day by day ripe, with terrestrial cellular system with respect to mobile satellite communication system of future generation also become study hotspot.
Mobile satellite communication of future generation aims to provide the service of wide range of types more, higher transmission rate, its main feature is to have gathered the key technology in 4G: OFDM (Orthogonal Frequency Division Multiplexing, OFDM), multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO), coordinated multipoint transmission (Coordinated Multiple Points Transmission/Reception, CoMP).But new 4G technology combines and has produced the feature that is different from terrestrial cellular system with satellite communication system.
Realize aspect from the function of synchronous satellite RRM, RRM system comprises the Core Features such as satellite MAC agreement, access control mechanism, link layer allocated bandwidth and physical layer resources distribution.Wherein, satellite MAC agreement is the basic framework of RRM system, and major function is to solve multi-user's problem of shared Radio Resource in which way.Existing satellite MAC agreement is divided into three major types, comprises random access class, bandwidth fixed allocation class, bandwidth distribution according to need class.At present bandwidth distribution according to need mode has become synchronous satellite communications system design and the trend realizing, but due to the long propagation delay of GEO satellite link, bandwidth request/assigning process has increased service delay.Therefore, the contradiction between high resource utilization and low service delay is a key problem that need to solve based on bandwidth demand assigned RRM system, is study hotspot in recent years.
The difficult problem that MAC layer RRM will face is how between resource utilization ratio and user QoS satisfaction, to reach a kind of balance.From the angle of system, conventionally wish reach the peak use rate of system resource or hold maximum access users, thereby reach maximizing the benefits; Wish that from user's angle no matter when and where system can both provide enough resources to access for user, to obtain satisfied QoS.
Transmission Control Protocol is a kind of window protocol for wired networks design, be widely used in now communicating by letter between mobile terminal and synchronous satellite communications system, because mobile network has higher time delay and the error rate, and the Transmission Control Protocol of ground cable network is regarded packet loss as network congestion conventionally, therefore can reduce the throughput of entire system; In addition, due to the quick variation of the environment of eating dishes without rice or wine, the transmit leg of TCP often can not be grasped the quick variation of wireless link and bandwidth in time, causes buffer overflow and produces packet loss.
For synchronous satellite communications system, because satellite is in the synchronous satellite orbit very high apart from ground, the round-trip delay of signal (Round-Trip Time, RTT) can reach 500ms, therefore need to not increase under the prerequisite of packet loss in guarantee, reduce the impact that time delay is brought.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how not increase under the prerequisite of packet loss, reducing the impact that time delay is brought.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of MAC-TCP cross-layer optimizing jamming control method, described jamming control method comprises the following steps:
S1: it is overtime that synchronous satellite judges which mobile terminal occurs at the overstocked tcp data bag of the MAC of described synchronous satellite layer, and by gateway, congested warning is sent to corresponding mobile terminal;
S2: described mobile terminal receives after described congested warning, judges whether to exist falseness overtime, if so, performs step S3;
S3: described mobile terminal judges that described falseness is overtime and if so, directly adopts Congestion Avoidance method whether because subscriber channel decline institute causes, until subscriber channel decline finishes, if not, first adopts quick recovery method, then adopt Congestion Avoidance method.
Wherein, before step S1, also comprise:
S0: the tcp data bag that described synchronous satellite obtains all mobile terminals arrives the speed of MAC layer of described synchronous satellite and the tcp data report of all mobile terminals overstocked situation at the MAC of described synchronous satellite layer;
In step S1, described synchronous satellite judges that according to the speed getting and overstocked situation which mobile terminal occurs overtime at the overstocked tcp data bag of the MAC of described synchronous satellite layer.
Wherein, described overstocked situation comprises: data volume and time delay.
Wherein, step S2 specifically comprises:
S201: described mobile terminal receives after described congested warning, detects data are overtime, and data are overtime if detect, the data time-out time detecting deducted to the time of reception of described congested warning, to obtain the time interval;
S202: described mobile terminal compared with predetermined interval, if be not more than, be judged as the described time interval generation false overtime, and perform step S3.
Wherein, in step S202, if be greater than, return to step S1.
Wherein, in step S201, if do not detect, data are overtime, return to step S1.
Wherein, in step S3, described mobile terminal judges that by following steps described falseness is overtime whether because subscriber channel decline causes:
S301: described mobile terminal is set as Slow start threshold ssthresh currently to have sent but also do not received the half of the number of the tcp data report of confirmation, congestion window size is set as identical with described Slow start threshold ssthresh, and adjusts retransmission time out timer;
S302: described mobile terminal records current congestion window size, by described current congestion window and congestion window comparison before, if be not less than, judge described falseness overtime be because subscriber channel decline institute causes, if be less than, judge described falseness overtime be not because subscriber channel decline institute causes.
Wherein, after step S3, also comprise:
S4: described synchronous satellite judges whether to reach predetermined period, if not, waits for, until reach after described predetermined period, returns to step S0, if so, directly returns to step S0.
Wherein, described congested warning is the tcp data bag that packet header is provided with congestion flag position.
The invention also discloses a kind of MAC-TCP cross-layer optimizing congestion control system, described congestion control system comprises: synchronous satellite, gateway and mobile terminal;
Described synchronous satellite, overtime for judging which mobile terminal occurs at the overstocked tcp data bag of the MAC of described synchronous satellite layer, and by gateway, congested warning is sent to corresponding mobile terminal;
Described mobile terminal, for receiving after described congested warning, judges whether to exist false overtime;
Whether described mobile terminal, also if so, directly adopt Congestion Avoidance method for judging that described falseness is overtime because subscriber channel decline causes, until subscriber channel decline finishes, if not, first adopts quick recovery method, then adopt Congestion Avoidance method.
(3) beneficial effect
The present invention is false overtime by judging whether mobile terminal exists, then determines the false overtime reason that causes, and the different reasons that causes is carried out to respective handling, and making is not increasing under the prerequisite of packet loss, has reduced the impact that time delay is brought.
Brief description of the drawings
Fig. 1 is the flow chart of the MAC-TCP cross-layer optimizing jamming control method of one embodiment of the present invention;
Fig. 2 is that mobile terminal is received the processing schematic diagram after congested warning;
Fig. 3 is the structural representation in the packet header of the tcp data bag that adopts of congested warning;
Fig. 4 is the structural representation of the MAC-TCP cross-layer optimizing congestion control system of one embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the flow chart of the MAC-TCP cross-layer optimizing jamming control method of one embodiment of the present invention; With reference to Fig. 1, described jamming control method comprises the following steps:
S1: it is overtime that synchronous satellite judges which mobile terminal occurs at the overstocked tcp data bag of the MAC of described synchronous satellite layer, and by gateway, congested warning is sent to corresponding mobile terminal;
S2: described mobile terminal receives after described congested warning, judges whether to exist falseness overtime, if so, performs step S3;
S3: described mobile terminal judges that described falseness is overtime and if so, directly adopts Congestion Avoidance method whether because subscriber channel decline institute causes, until subscriber channel decline finishes, if not, first adopts quick recovery method, then adopt Congestion Avoidance method.
By accurately judging which mobile terminal occurs overtime at the overstocked tcp data bag of the MAC of described synchronous satellite layer, need to judge whether the tcp data bag that user is squeezed in MAC layer occurs overtime by MAC layer statistics Beam resources scheduling situation and each user's Packet Generation information, preferably, before step S1, also comprise:
S0: the tcp data bag that described synchronous satellite obtains all mobile terminals arrives the speed of MAC layer of described synchronous satellite and the tcp data report of all mobile terminals overstocked situation (the Real-Time Scheduling result that described speed and overstocked situation are resource scheduling algorithm) at the MAC of described synchronous satellite layer;
If being transmission rate that a certain mobile terminal distributes, described resource scheduling algorithm continues to be less than this mobile terminal tcp data bag and arrives the speed of MAC layer, be that the time delay that mobile terminal tcp data wraps in MAC layer will constantly increase, finally cause TCP and retransmit the overtime of timer.Now, the MAC layer " congested " of synchronous wideband satellite system to have caused the falseness of TCP transmitting terminal overtime;
In step S1, described synchronous satellite judges that according to the speed getting and overstocked situation which mobile terminal occurs overtime at the overstocked tcp data bag of the MAC of described synchronous satellite layer.
Preferably, described overstocked situation comprises: data volume and time delay etc.
Exceeded the processing time limit because some data is overtime, on current congested without any impact, so mobile terminal is received after congested warning, need to judge that data are overtime whether in the term of validity of congested warning, just can judge whether to exist false overtime, with reference to Fig. 2, preferably, step S2 specifically comprises:
S201: described mobile terminal receives after described congested warning, detects data are overtime, and data are overtime if detect, the data time-out time detecting deducted to the time of reception of described congested warning, to obtain the time interval;
S202: described mobile terminal compared with predetermined interval, if be not more than, be judged as the described time interval generation false overtime, and perform step S3.
Preferably, in step S202, if be greater than, return to step S1.
Preferably, in step S201, if do not detect, data are overtime, return to step S1.
Whether caused by subscriber channel decline by accurately judging that described data are overtime, preferably, in step S3, described mobile terminal judges that by following steps described falseness is overtime whether because subscriber channel decline causes:
S301: described mobile terminal is by Slow start threshold (slow start threshold, ssthresh) be set as currently having sent but also not received the half of the number of the tcp data report of confirmation, by congestion window (congestion window, cwnd) size is set as identical with described Slow start threshold ssthresh, and adjust retransmission time out timer (Retransmission Time-out, RTO);
S302: described mobile terminal records current congestion window (after false overtime generation) size, by described current congestion window and congestion window comparison before, if be not less than, judge described falseness overtime be because subscriber channel decline institute causes, if be less than, judge described falseness overtime be not because subscriber channel decline institute causes.
Correspondingly, in step S3, described mobile terminal judges that described falseness is overtime whether because subscriber channel decline causes, if, directly adopt Congestion Avoidance method, until subscriber channel decline finishes, if not, overtime to be judged as the periodicity falseness being caused by the MAC layer scheduling mechanism of synchronous satellite overtime for described falseness, periodically false overtime to this, first adopt quick recovery method, once overtime when big or small before congestion window returns to, then adopt Congestion Avoidance method.
For carrying out periodically congestion control, preferably, after step S3, also comprise:
S4: described synchronous satellite judges whether to reach predetermined period, if not, waits for, until reach after described predetermined period, returns to step S0, if so, directly returns to step S0.
For ease of sending congested warning, preferably, described congested warning is the tcp data bag that packet header is provided with congestion flag position, wherein, congested warning sends criterion: the bit7 position in the packet header Byte of tcp data bag (is under the jurisdiction of to TCP and retains position) as congested caution sign position (MAC-Cross Layer Warning, MAC-CLW), as shown in Figure 3.In the time sending congested warning, generate a tcp data bag by the gateway of described synchronous satellite, and the packet header MAC-CLW of this tcp data bag is put to 1, return to mobile terminal.
Embodiment 1
Now consider the overtime situation of falseness being caused by the MAC layer periodic scheduling of synchronous satellite, MAC layer is periodically monitored scheduling of resource situation and each user's information, comprise that each user's tcp data bag arrives the speed of MAC layer, user's tcp data wraps in the overstocked situation of MAC layer, comprises data volume, time delay etc.
Now MAC layer monitors mobile terminal A and overstocks and occur overtimely at the tcp data bag of MAC layer, and the tcp data time-out information of the mobile terminal A that gateway of synchronous satellite monitors MAC layer is notified to mobile terminal A by the mode cross-layer of congested warning.
Mobile terminal A receives after congested warning, in the term of validity of congested warning, sends tcp data bag and exist the phenomenon of answer signal receive time-out if monitor, and is judged to be to occur false overtime.Now, ssthresh is set as currently having sent but also not received the half of the number of the tcp data bag of confirmation, and cwnd size is set as amended ssthresh.And adjust retransmission time out timer.Record the current congestion window size after false overtime generation, now overtime congestion window overtime congestion window once before being less than, the tcp data bag of being regarded as the mobile terminal A that the MAC layer scheduling mechanism of synchronous satellite cause is periodically false overtime, adopts quick recovery method; Once overtime when big or small before congestion window returns to, adopt the Congestion Avoidance method of standard.
Embodiment 2
Now consider the false overtime situation of the TCP being caused by the channel fading of synchronous satellite broadband system, different from embodiment 1, record the congestion window size after false overtime generation, now overtime congestion window is not less than previous overtime congestion window, it is paroxysmal regarding as current falseness overtime, is that channel quality variation causes due to the decline of synchronous wideband satellite user channel experience, the Congestion Avoidance mode of Engage of standard, waits for that channel fading finishes.
The invention also discloses a kind of MAC-TCP cross-layer optimizing congestion control system, with reference to Fig. 4, described congestion control system comprises: synchronous satellite, gateway and mobile terminal;
Described base station, overtime for judging which mobile terminal occurs at the overstocked tcp data bag of the MAC of described synchronous satellite layer, and by gateway, congested warning is sent to corresponding mobile terminal;
Described mobile terminal, for receiving after described congested warning, judges whether to exist false overtime;
Whether described mobile terminal, also if so, directly adopt Congestion Avoidance method for judging that described falseness is overtime because subscriber channel decline causes, until subscriber channel decline finishes, if not, first adopts quick recovery method, then adopt Congestion Avoidance method.
Described system is used for realizing said method, does not repeat them here.
Above execution mode is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a MAC-TCP cross-layer optimizing jamming control method, is characterized in that, described jamming control method comprises the following steps:
S1: it is overtime that synchronous satellite judges which mobile terminal occurs at the overstocked tcp data bag of the MAC of described synchronous satellite layer, and by gateway, congested warning is sent to corresponding mobile terminal;
S2: described mobile terminal receives after described congested warning, judges whether to exist falseness overtime, if so, performs step S3;
S3: described mobile terminal judges that described falseness is overtime and if so, directly adopts Congestion Avoidance method whether because subscriber channel decline institute causes, until subscriber channel decline finishes, if not, first adopts quick recovery method, then adopt Congestion Avoidance method.
2. jamming control method as claimed in claim 1, is characterized in that, before step S1, also comprises:
S0: the tcp data bag that described synchronous satellite obtains all mobile terminals arrives the speed of MAC layer of described synchronous satellite and the tcp data report of all mobile terminals overstocked situation at the MAC of described synchronous satellite layer;
In step S1, described synchronous satellite judges that according to the speed getting and overstocked situation which mobile terminal occurs overtime at the overstocked tcp data bag of the MAC of described synchronous satellite layer.
3. jamming control method as claimed in claim 2, is characterized in that, described overstocked situation comprises: data volume and time delay.
4. jamming control method as claimed in claim 1, is characterized in that, step S2 specifically comprises:
S201: described mobile terminal receives after described congested warning, detects data are overtime, and data are overtime if detect, the data time-out time detecting deducted to the time of reception of described congested warning, to obtain the time interval;
S202: described mobile terminal compared with predetermined interval, if be not more than, be judged as the described time interval generation false overtime, and perform step S3.
5. jamming control method as claimed in claim 4, is characterized in that, in step S202, if be greater than, returns to step S1.
6. jamming control method as claimed in claim 4, is characterized in that, in step S201, if do not detect, data are overtime, return to step S1.
7. jamming control method as claimed in claim 2, is characterized in that, in step S3, described mobile terminal judges that by following steps described falseness is overtime whether because subscriber channel decline causes:
S301: described mobile terminal is set as Slow start threshold ssthresh currently to have sent but also do not received the half of the number of the tcp data report of confirmation, congestion window size is set as identical with described Slow start threshold ssthresh, and adjusts retransmission time out timer;
S302: described mobile terminal records current congestion window size, by described current congestion window and congestion window comparison before, if be not less than, judge described falseness overtime be because subscriber channel decline institute causes, if be less than, judge described falseness overtime be not because subscriber channel decline institute causes.
8. jamming control method as claimed in claim 7, is characterized in that, after step S3, also comprises:
S4: described synchronous satellite judges whether to reach predetermined period, if not, waits for, until reach after described predetermined period, returns to step S0, if so, directly returns to step S0.
9. the jamming control method as described in any one in claim 1～8, is characterized in that, described congested warning is the tcp data bag that packet header is provided with congestion flag position.
10. a MAC-TCP cross-layer optimizing congestion control system, is characterized in that, described congestion control system comprises: synchronous satellite, gateway and mobile terminal;
Described synchronous satellite, overtime for judging which mobile terminal occurs at the overstocked tcp data bag of the MAC of described synchronous satellite layer, and by gateway, congested warning is sent to corresponding mobile terminal;
Described mobile terminal, for receiving after described congested warning, judges whether to exist false overtime;
Whether described mobile terminal, also if so, directly adopt Congestion Avoidance method for judging that described falseness is overtime because subscriber channel decline causes, until subscriber channel decline finishes, if not, first adopts quick recovery method, then adopt Congestion Avoidance method.
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Cited By (3)
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