CN103874233A - Synergy slotted ALOHA protocol based on capture effect - Google Patents
Synergy slotted ALOHA protocol based on capture effect Download PDFInfo
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- CN103874233A CN103874233A CN201410061112.8A CN201410061112A CN103874233A CN 103874233 A CN103874233 A CN 103874233A CN 201410061112 A CN201410061112 A CN 201410061112A CN 103874233 A CN103874233 A CN 103874233A
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Abstract
The invention relates to a synergy slotted ALOHA protocol based on the capture effect, which comprises the following steps: (1) in each time slot, a system might be in an ordinary mode or in a retransmission mode, the initial state of the network is the ordinary mode, and a user who does not transmit a frame overhears frames transmitted by other users; (2) in an ordinary mode time slot, the user who successfully overhears the data frames of the other users transmits a reporting frame to a base station at the end of the time slot; (3) at the end of the ordinary mode time slot, the base station transmits a broadcast frame according to the received data frame and reporting frame, and the network decides whether to switch to the retransmission mode accordingly; (4) after entering the retransmission mode, the user whose buffer area is not null transmits the data framed overheard by the user at certain frequency. Compared with the traditional synergy slotted ALOHA protocol, under the condition of the same average signal noise ratio of a link, the synergy slotted ALOHA protocol based on the capture effect disclosed by the invention improves the throughput rate of system peaks.
Description
Technical field
The invention belongs to the multiple access technique field in cordless communication network, be specifically related to work in coordination with (Cooperative) time slot A LOHA agreement.
Background technology
Due to the broadcast of wireless channel, the Frame that terminal sends can not only be received by object terminal, also can be monitored (overhear) by near other terminal.In communication for coordination, the Frame of receiving is transmitted to object terminal by these terminals again, and therefore object terminal can be received multiple versions (a Frame is received after transmitting by multiple independent channels respectively) of a Frame, thereby obtains diversity gain.To being widely used in the time slot A LOHA agreement of satellite communication, wireless sensor network, wireless cellular network, people have also proposed concrete communication for coordination scheme, to improve its throughput
[1] [2].
But in the collaborative time slot A LOHA agreement of tradition, in the time that the Frame that has two or more in network sends simultaneously, these frames all can not can not correctly be monitored by other user by the correct reception in base station.And in practical communication, due to near-far interference and channel fading, the frame sending may have very big difference at the power of receiving terminal simultaneously, the frame that therefore received power is relatively high still may be correctly received or monitor.This phenomenon is called capture effect (Capture Effect)
[3].For receiver, the power of other frame and the ratio of noise sum that in the power of the frame that can correctly receive and channel, send have a minimum threshold simultaneously, capture than (Capture Ratio).Receive function and reach the ratio of capturing lower than 1.5dB
[4].
The collaborative time slot A LOHA agreement of tradition does not consider to apply capture effect.And the present invention proposes a kind of collaborative time slot A LOHA agreement based on capture effect, make more user can listen to the Frame that other user sends and retransmit these frames, thereby increase diversity gain, further improve system throughput.
List of references
[1]M.S.Gokturk,O.Ercetin,and?O.Gurbuz,“Throughput?analysis?of?ALOHA?with?coopeartive?diversity,”IEEE?Commun.lett.,vol.12,no.6,pp.468-470,Jun.2008。
[2]Y.H.Chiang?and?K.Chen,“Optimal?coopeative?ALOHA?multiple?access?in?fading?channels,”IEEE?Commun.Lett.,vol.14,no.8,pp.779-781,Aug.2010。
[3]M.Zorzi?and?R.R.Rao,“Capture?and?retransmission?control?in?mobile?radio,”IEEE?J.Sel.Areas?Commmun.,vol.12,no.8,pp.1289-1298,Oct.1994。
[4]R.Nelson,L.Kleinrock,The?spatial?capacity?of?a?slotted?ALOHA?multihop?packet?radio?network?with?capture,IEEE?Trans.Commun.32(6)(1984)684–694。
Summary of the invention
The object of the invention is in order to promote the collaborative slotted ALOHA system throughput of tradition, and propose a kind of collaborative time slot A LOHA agreement of applying capture effect.
For achieving the above object, the collaborative time slot A LOHA based on capture effect that the present invention proposes, comprises the following steps:
(1), in each time slot, network may be in general mode or retransmission mode.Network initial condition is general mode, and under general mode, the user who does not have frame to send monitors the frame that other user sends.According to capture effect, capture the received power sum (I) that is multiplied by network other Frame simultaneously sending than (R) and add interchannel noise (N) when the received power (P) of a Frame is greater than, be P>R (I+N), this frame can or correctly be monitored by user by the correct reception in base station.And in traditional collaborative time slot A LOHA, as long as have two or more different Frames to send in system simultaneously, these Frames all can not correctly be received by base station, can not correctly be monitored by other user.Therefore the present invention can make a Frame be listened to by more user, thereby obtains more retransmission opportunity, obtains higher diversity gain.
(2), in general mode time slot, the user who successfully listens to other user data frame sends a report frame to base station at time slot end.
(3), at general mode time slot end, base station, according to the Frame that receives and report frame, sends broadcast frame, network determines whether be transformed into retransmission mode at next time slot accordingly.Be specially: in the time of base station broadcast S or T frame, network is still general mode at next time slot; When base station broadcast H frame, next time slot of network is transferred to retransmission mode.
(4), enter after retransmission mode, the user of buffering area non-NULL independently sends the frame in its buffering area with certain probability, all use is not monitored per family.
The present invention compares traditional collaborative time slot A LOHA agreement, and under the identical condition of link average signal-to-noise ratio, the collaborative time slot A LOHA agreement based on capture effect has improved system peak throughput.
Accompanying drawing explanation
Fig. 1 is the collaborative time slot A LOHA agreement based on capture effect and the traditional throughput performance comparative graph of working in coordination with time slot A LOHA agreement that the present invention proposes;
Fig. 2 is the sequential chart that in the present invention, user received, sent and monitored all kinds of frames;
Fig. 3 is the transition diagram of network between general mode and retransmission mode in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Based on the collaborative time slot A LOHA of capture effect, comprise the following steps:
(1), in each time slot, network may be in general mode or retransmission mode.Network initial condition is general mode, and under this pattern, the probability that the each user of each time slot sends a Frame is p, and the probability that does not send Frame is 1-p, sends separate; The user who does not have Frame to send monitors the Frame that other user sends, and the Frame correctly listening to is stored in the buffering area that its capacity is a data frame sign.
(2), in general mode, according to capture effect, capture the received power sum (I) that is multiplied by network other Frame simultaneously sending than (R) and add interchannel noise (N) when the received power (P) of a Frame is greater than, be P>R (I+N), this frame can or correctly be monitored by user by the correct reception in base station.
(3), in general mode time slot, the user who successfully listens to other user data frame sends a report frame to base station at time slot end.All report frames have same format and content, and length is very short, and it adopts channel coding technology to be correctly decoded by base station with assurance.
(4), at general mode time slot end, base station, according to the Frame that receives and report frame, sends broadcast frame.User sends or monitored data frame, and the sequential relationship that sends report frame and reception broadcast frame is shown in Fig. 1.Broadcast frame has following three types:
A, S frame: if base station successfully receives a Frame in time slot, it will be at this frame of time slot end broadcast;
B, H frame: if base station any Frame of unsuccessful reception in time slot, but received report frame (showing to have at least a user successfully to listen to other user's Frame), base station will be at this frame of time slot end broadcast;
C, T frame: if in time slot, occur non-above situation, base station will be at this frame of time slot end broadcast.
Above broadcast frame length is all very short, and adopts channel coding technology correctly to be received by all users with assurance.
(5), system determines the network state of next time slot according to broadcast frame.State transitions mode is specially: in the time of base station broadcast S or T frame, network is still general mode at next time slot; When base station broadcast H frame, next time slot of network is transferred to retransmission mode;
(6), enter after retransmission mode, buffering area is for the empty each time slot of user sends it with probability q and listens to Frame, the probability not sending is 1-q, sends separate; User does not monitor.
(7), under retransmission mode, for a certain Frame, if it is positive integer that base station successfully receives its J(J) individual version is (, have user that J listens to this Frame successfully by this data frame re-transmission to base station), with other K(K be nonnegative integer) individual Frame, Maximal ratio combining reception will be carried out in base station, obtain diversity gain.The number that wherein J is diversity branch, other K Frame is for disturbing.
(8), enter the next time slot after retransmission mode, system will be got back to normal mode.Fig. 2 is shown in transfer between pattern.
(9) all Frames that, in above step, user sends are isometric and send in the time that time slot starts.
Fig. 3, by emulation, compares in the network that is 10 at a number of users throughput difference of the collaborative time slot A LOHA agreement based on capture effect and traditional collaborative time slot A LOHA agreement.Wherein, under retransmission mode, the probability q of a packet of each time slot user transmission is 0.6, captures than being 3dB, and a is link average signal-to-noise ratio, and abscissa p is the probability that under general mode, each time slot user sends a packet; Ordinate y is network throughput.Comparing traditional collaborative time slot A LOHA agreement, is 10dB at link average signal-to-noise ratio, 6dB, and when 3dB, the collaborative time slot A LOHA agreement based on capture effect has improved respectively approximately 56%, 43% and 31% by system peak throughput.
Other unspecified part is prior art.
Claims (8)
1. the collaborative time slot A LOHA agreement based on capture effect, is characterized in that comprising the following steps:
(1), in each time slot, network is in general mode or retransmission mode, network initial condition is general mode, under this pattern, the probability that the each user of each time slot sends a Frame is p, the probability that does not send Frame is 1-p, sends separate; The user who does not have Frame to send monitors the Frame that other user sends;
(2), in general mode time slot, the user who successfully listens to other user data frame sends a report frame to base station at time slot end;
(3), at general mode time slot end, base station, according to the Frame that receives and report frame, sends broadcast frame, network judges accordingly at next time slot whether be transformed into retransmission mode;
(4), enter after retransmission mode, buffering area is for the empty each time slot of user sends it with probability q and listens to Frame, the probability not sending is 1-q, sends separately, user does not monitor, the next time slot of network is transferred to general mode.
2. the collaborative time slot A LOHA agreement based on capture effect according to claim 1, it is characterized in that, in step (1), under general mode, according to capture effect, capture the received power sum I that is multiplied by network other Frame simultaneously sending than R and add interchannel noise N when the received power P of a Frame is greater than, i.e. P>R (I+N), this frame can be received or correctly be monitored by user by base station is correct.
3. the collaborative time slot A LOHA agreement based on capture effect according to claim 2, it is characterized in that, user is in the buffering area of a data frame sign by the Frame capacity of being stored in correctly listening to, the duration that frame exists in buffering area is no more than a time slot, it is at monitored second time slot end arriving, the Frame newly being listened to is covered, or directly delete.
4. the collaborative time slot A LOHA agreement based on capture effect according to claim 1, is characterized in that, in step (2), all report frames have same format and content, and length is very short, and it adopts channel coding technology correctly to be received by base station with assurance.
5. the collaborative time slot A LOHA agreement based on capture effect according to claim 1, is characterized in that, the broadcast frame in step (3) has following three types:
A, S frame: if base station successfully receives a Frame in time slot, it will be at this frame of time slot end broadcast;
B, H frame: if base station any Frame of unsuccessful reception in time slot, but received report frame, show to have at least a user successfully to listen to other user's Frame, base station will be at this frame of time slot end broadcast;
C, T frame: if in time slot, occur non-above situation, this frame will be broadcasted at time slot end in base station,
Above broadcast frame adopts channel coding technology correctly to be received by all users with assurance.
6. the collaborative time slot A LOHA agreement based on capture effect according to claim 5, is characterized in that: in the time of base station broadcast S or T frame, network is still general mode at next time slot; When base station broadcast H frame, next time slot of network is transferred to retransmission mode.
7. the collaborative time slot A LOHA agreement based on capture effect according to claim 1, it is characterized in that, in step (4), under retransmission mode, for a certain Frame, if base station successfully receives its J version, J is positive integer, have user that J correctly listens to this Frame successfully by this data frame re-transmission to base station, and other K Frame, K is nonnegative integer, Maximal ratio combining reception will be carried out in base station, thereby acquisition diversity gain, the number that wherein J is diversity branch, other K Frame is for disturbing.
8. the collaborative time slot A LOHA agreement based on capture effect according to claim 1, is characterized in that, in step (1)-(4), all Frames that user sends are isometric and send in the time that time slot starts.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106075651A (en) * | 2016-06-13 | 2016-11-09 | 武汉科技大学 | A kind of caution system of the detection transfusion removing capture effect |
| CN108012340A (en) * | 2017-11-23 | 2018-05-08 | 北京邮电大学 | A kind of multicarrier cooperation slotted Aloha method |
| CN110300028A (en) * | 2019-07-01 | 2019-10-01 | 长春工业大学 | A kind of Ethernet model design method based on time slot no persistent CSMA |
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| CN102056324A (en) * | 2010-12-22 | 2011-05-11 | 中国人民解放军理工大学 | Cooperative carrier sense multiple access (CSMA) method based on token control conflict analysis |
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| WO2005119986A1 (en) * | 2004-06-04 | 2005-12-15 | Mitsubishi Denki Kabushiki Kaisha | Wireless communication network and method for transmitting packets over channel in wireless communication network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106075651A (en) * | 2016-06-13 | 2016-11-09 | 武汉科技大学 | A kind of caution system of the detection transfusion removing capture effect |
| CN106075651B (en) * | 2016-06-13 | 2019-01-04 | 武汉科技大学 | A kind of warning system of the detection infusion of removal capture effect |
| CN108012340A (en) * | 2017-11-23 | 2018-05-08 | 北京邮电大学 | A kind of multicarrier cooperation slotted Aloha method |
| CN110300028A (en) * | 2019-07-01 | 2019-10-01 | 长春工业大学 | A kind of Ethernet model design method based on time slot no persistent CSMA |
| CN110300028B (en) * | 2019-07-01 | 2022-04-01 | 长春工业大学 | Ethernet model design method based on time slot non-adherence CSMA |
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