CN107396433A - WLAN energy-saving method and STA based on NDN frameworks - Google Patents

WLAN energy-saving method and STA based on NDN frameworks Download PDF

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CN107396433A
CN107396433A CN201710642099.9A CN201710642099A CN107396433A CN 107396433 A CN107396433 A CN 107396433A CN 201710642099 A CN201710642099 A CN 201710642099A CN 107396433 A CN107396433 A CN 107396433A
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sta
states
pit
doze
data
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CN107396433B (en
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阳旺
吴帆
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Central South University
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Central South University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to wireless local area network technology field, discloses a kind of WLAN energy-saving method and STA based on NDN frameworks, to combine the energy consumption that STA is further reduced the characteristics of NDN networks.The inventive method includes：It is five kinds of states by the PSM mode divisions between the STA and AP of NDN networks, is respectively：Deep Doze states, Light Doze states, Idle Listening states, Tx states and Rx states；TIM information transmitted by each STA combinations Beacon cycles, local PIT tables and corresponding AP switches between five kinds of states.

Description

WLAN energy-saving method and STA based on NDN frameworks
Technical field
The present invention relates to wireless local area network technology field, more particularly to a kind of WLAN energy-saving based on NDN frameworks Method and STA (Station, standing).
Background technology
Current wireless Local Area Network due to its relatively low installation cost and simple accessibility, be widely deployed in office or Public domain, it provide the user great convenience.Simultaneously as the development of embedded technology and new electronic product, movement are set The standby and rapid popularization of wearable device, the mode that they access internet also more have selected Wi-Fi network so that Wi- Fi networks have become the emphasis of people's research.However, as mobile terminal is quickly grown, WLAN also spreads all over the world, And the energy source of current mobile device is still battery.With becoming stronger day by day for mobile terminal function, energy expenditure is also corresponding Increase, but hardware advances are still limited, battery capacity is gradually difficult to the energy expenditure for meeting mobile terminal, and energy is to restrict nothing One of main factor of line network Development, therefore the mobile terminal power consumption issues under wireless network are urgently to be resolved hurrily.
The energy-conservation of WLAN is more the research in MAC layer, wherein in energy saver mode (Power Saving Mode, PSM) on the basis of to optimize and improve be important direction.IEEE 802.11 energy saver mode basic thought is： AP (Access Point, access point) caches downlink data, is actively asked only after node dormancy terminates to AP, and AP is just carried out The feedback of downlink data.However, IEEE 802.11 based on TCP/IP end to end communication mechanism, it is necessary to keep the both ends that communicate Connectivity, can not pre- primary data when return, it is necessary to intercept channel always, cause wireless terminal can not be efficiently entering PSM Pattern.Here a problem is there are in fact, i.e. node is not known on AP either with or without the data cached of oneself；Therefore actual thinking should This is that periodically to corresponding node, it broadcasts buffer area situation, such as the TIM by being carried in Beacon (beacon) frame to AP (Traffic Indication Map, Traffic Indication Map) field, and identify and have the slow of broadcast data packet in AP, so as to node It is known that whether oneself is by data buffer storage；After dormancy terminates, request of data will be carried out by being buffered the node of data, instead Continue to dormancy.
On the other hand, the work for how reducing IL (Idle Listening, the idle listening) times is directed in existing research Also there are a lot, time and listening interval (Listening Interval, LI) due to the Idle Listening of PSM mechanism There is substantial connection, the Idle times can be reduced to a certain extent by adjusting LI cycle, increase dormancy time.
In addition, wireless terminal reception will be caused to its data are not belonging to by multicast distribution data, although the data meeting It is dropped, but needs wireless terminal to wake up reception from resting state and be not belonging to its data, will so wastes unnecessary energy consumption. Wireless terminal energy consumption saving is also faced in wireless NDN (Named Data Networking, naming data network) network to ask Topic.Due to NDN natural support multicast mechanisms, distribute data with the forms of broadcasting under wireless environment, serious terminal energy will be caused Consumption wastes.
NDN, to name data to substitute IP, is directly carried out as a kind of Future Internet framework of revolution formula with content name Route, data transfer use " issue-request-response " pattern, realize point-to-multipoint efficient content distribution.NDN routing mechanisms On remain the converting routes (Forwarding Information Base, FIB) of similar IP routes, add pending Required list (Pending Interest Table, PIT) and content caching (Content Store, CS) data structure, FIB For matching suitable forwarding interface, CS is used for the caching of content, and PIT retains received request bag, when with some in PIT When packet is beamed back corresponding to request, corresponding interface will be passed to.NDN using it is similar with IP based on be stored in FIB with The longest prefix match forwarding of information in PIT.NDN not only avoids network conflict and congestion in principle, has broken away from transmission Dependence to end to end connection, multilink route is realized, while be based on caching in network to realize acquisition nearby, load and put down Weighing apparatus, so as to substantially increase the performance of extensive content distribution, efficiency and reliability.
In NDN networks, on STA PSM patterns, there is presently no clear and definite definition.If with reference to existing Some opinions in IEEE802.11 agreements, because it define only dormancy, free time, send and receive four kinds of states, except above-mentioned Outside the problem of broadcast energy consumption faced is big, in actual motion, corresponding STA is in idle condition mostly, and idle condition phase More power consumptions can be also produced than resting state, it is thus possible to which further improved；Meanwhile STA needs from resting state wake-up Multiple Beacon cycles are wanted, thus can cause data return latency.
To solve wireless terminal energy consumption problem, the present invention proposes a kind of WLAN energy-saving method based on NDN frameworks, Using NDN characteristics, design and be adapted to wireless NDN network energy-saving methods.Because NDN network nodes maintain PIT and FIB information, lead to The PIT information for crossing acquisition present node would know that whether need request data in network, and reasonably be stopped with reference to TIM information Sleep and dispatch so that wireless terminal enters resting state as far as possible, but keeps relatively low data delay simultaneously.
The content of the invention
Present invention aims at a kind of WLAN energy-saving method and STA based on NDN frameworks is disclosed, with reference to NDN The characteristics of network, further reduces STA energy consumption.
To achieve the above object, the invention discloses a kind of WLAN energy-saving method based on NDN frameworks, including：
It is five kinds of states by the PSM mode divisions between the STA and AP of NDN networks, is respectively：Deep Doze (stop by depth Sleep) state, Light Doze (shallow dormancy) state, Idle Listening (free time) state, Tx (Transmitting, transmission) State and Rx (Receiving, receive) state；
TIM information transmitted by each STA combinations Beacon cycles, local PIT tables and corresponding AP is at described five kinds Switched between state, specific switching includes：
STA creates Interest, and whether in local CS have corresponding Interest data, if so, then returning if checking Return data；If not provided, the prefix of the Interest and corresponding interface are established into a new entry increases in PIT tables, Then Interest to corresponding AP is sent；Now, the PIT=1 of the STA, STA enter Light Doze states；
When the STA is in Light Doze, whether the TIM transmitted by the corresponding AP of each wake-up period inspection in setting There is data return；If TIM=0, data are represented also without AP is returned, STA continues in Light Doze states；If PIT=1 And TIM=1, represent that data have returned to AP, then STA switches to Idle Listening states；
When in Idle Listening states, the channel between the STA competitions and corresponding AP, if do not competed Channel, then switch to Light Doze states；If channel, conversion to Tx states are arrived in competition；
When in Tx states, the STA is to corresponding AP request datas, and after all data have been received, checking again for PIT is No is 0, if PIT=0, into Deep Doze states；If PIT=1 and TIM=0, into Light Doze states；
When in Deep Doze states, the wake-up period of default setting is integer more than Beacon cycle at least twice Times, and be waken up when needing and sending Interest；When in Light Doze states, the wake-up period of setting is described The integral multiple in Beacon cycles；And the STA corresponds to the wake-up period of Light Doze states less than or equal to corresponding Deep The wake-up period of Doze states；
Wherein, PIT=1, the PIT tables for representing corresponding STA are not sky, that is, have data to need to return；Conversely, represent corresponding The data or PIT entry that STA not asked are expired；And
TIM=1, represent that corresponding AP has cached corresponding STA data；Conversely, represent that corresponding AP does not receive corresponding STA's Data.
In the present invention, common Deep Doze wake-up periods are traditionally arranged to be 3 Beacon or more long, but typically not More than 9 Beacon cycles.STA can set Light Doze wakeup time, be waken up if provided as each beacon, So data delay is with regard to very little；If provided as the wake-up period as Deep Doze, it saves one with Deep Doze Sample；Its difference is the checking mechanism after waking up, and that be waken up detection in Deep Doze is PIT, and in Light Doze It is waken up needs while detects PIT and TIM.Preferably, in the above-mentioned methods, can also be further using following improvement or specific Any one in executive measure or any combination：
1st, when above-mentioned STA is in Light Doze, check whether PIT entries are expired by STA, if expired, PIT=is set 0, and enter Deep Doze states.
2nd, when in Tx states, above-mentioned STA passes through phase in packet transmitted by corresponding AP when to corresponding AP request datas The bit identification answered judges whether all data receive.
3rd, above-mentioned STA sends null frame to inform AP before Deep Doze states are switched to corresponding AP.
4th, above-mentioned STA using back off mechanism (it is a kind of clash when mandatory retransmission delay avoidance mechanism) it is competing Channel is striven, if channel idle, STA sends PS-Poll frame request datas.
Corresponding with the above method, invention additionally discloses a kind of STA, is interacted for AP corresponding to NDN networks, The STA：For being five kinds of states by the PSM mode divisions of itself, it is respectively：Deep Doze states, Light Doze shapes State, Idle Listening states, Tx states and Rx states；Then in conjunction with Beacon cycles, local PIT tables and corresponding AP institutes The TIM information of transmission switches between five kinds of states, and specific switching includes：
STA creates Interest, and whether in local CS have corresponding Interest data, if so, then returning if checking Return data；If not provided, the prefix of the Interest and corresponding interface are established into a new entry increases in PIT tables, Then Interest to corresponding AP is sent；Now, the PIT=1 of the STA, STA enter Light Doze states；
When the STA is in Light Doze, whether the TIM transmitted by the corresponding AP of each wake-up period inspection in setting There is data return；If TIM=0, data are represented also without AP is returned, STA continues in Light Doze states；If PIT=1 And TIM=1, represent that data have returned to AP, then STA switches to Idle Listening states；
When in Idle Listening states, the channel between the STA competitions and corresponding AP, if do not competed Channel, then switch to Light Doze states；If channel, conversion to Tx states are arrived in competition；
When in Tx states, the STA is to corresponding AP request datas, and after all data have been received, checking again for PIT is No is 0, if PIT=0, into Deep Doze states；If PIT=1 and TIM=0, into Light Doze states；
When in Deep Doze states, the wake-up period of default setting is integer more than Beacon cycle at least twice Times, and be waken up when needing and sending Interest；When in Light Doze states, the wake-up period of setting is described The integral multiple in Beacon cycles；And the STA corresponds to the wake-up period of Light Doze states less than or equal to corresponding Deep The wake-up period of Doze states；
Wherein, PIT=1, the PIT tables for representing corresponding STA are not sky, that is, have data to need to return；Conversely, represent corresponding The data or PIT entry that STA not asked are expired；And
TIM=1, represent that corresponding AP has cached corresponding STA data；Conversely, represent that corresponding AP does not receive corresponding STA's Data.
The invention has the advantages that：
The present invention utilizes NDN architected features, increases Light Doze states, to solve wireless NDN terminal under environment energy consumption Problem.In order that obtaining STA more effectively enters NDN-PSM mechanism, increase Light Doze states distinguish each shape with more fine granularity State, STA determines whether to anticipate the data message reached using its PIT status information, and then can utilize NDN-PSM mechanism Allow STA more times in a dormant state, further improve mobile terminal STA energy consumption saving.Meanwhile in order to reduce data Return to delay, by etc. the STA of data to be received switch to Light Doze states, so not only ensure that STA energy-conservation, and At utmost reduce the delay of data.
Below with reference to accompanying drawings, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the NDN-PSM state transition process schematics of the embodiment of the present invention.
Embodiment
Embodiments of the invention are described in detail below in conjunction with accompanying drawing, but the present invention can be defined by the claims Implement with the multitude of different ways of covering.
Embodiment 1
The present embodiment discloses a kind of WLAN energy-saving method based on NDN frameworks.
Fig. 1 is based on NDN-PSM power-saving mechanism state transition processes under wireless NDN environment for the present invention.As shown in Figure 1：
STA wakes up from Deep Doze states create Interest first, checks in local CS whether there is corresponding Interest Data, if so, then returned data；If not provided, by the prefix of the Interest and corresponding interface establish one it is new Entry increases in PIT tables, then sends Interest to corresponding AP；Now, STA PIT=1, STA enter Light Doze states.
When STA is in Light Doze, whether there is number in the TIM transmitted by the corresponding AP of each Beacon periodic awakenings inspection According to return；If TIM=0, data are represented also without AP is returned, STA continues in Light Doze states；If PIT=1 and TIM=1, represent that data have returned to AP, then STA switches to Idle Listening states.
When in Idle Listening states, the channel between STA competitions and corresponding AP, if not competing letter Road, then switch to Light Doze states；If channel, conversion to Tx states are arrived in competition.
When in Tx states, STA is to corresponding AP request datas, after all data have been received, check again for PIT whether be 0, if PIT=0, into Deep Doze states；If PIT=1 and TIM=0, into Light Doze states.
When in Deep Doze states, the wake-up period of acquiescence at least twice in Beacon cycles more than, and needing It is waken up when sending Interest.
, can also be further using any one in following improvement or specific executive measure or any group in the present embodiment Close：
1st, when above-mentioned STA is in Light Doze, check whether PIT entries are expired by STA, if expired, PIT=is set 0, and enter Deep Doze states.
2nd, when in Tx states, above-mentioned STA passes through phase in packet transmitted by corresponding AP when to corresponding AP request datas The bit identification answered judges whether all data receive.I.e. by increasing extra bit identification in the packet transmitted by AP Whether (such as More data positions in subsequent embodiment) has more data, so as to reduce extra wait IL, so can Whether the data whether " precognition " has data to come and ask have been transmitted, and can reduce the IL times and disappear so as to save energy Consumption.
3rd, above-mentioned STA sends null frame to inform AP before Deep Doze states are switched to corresponding AP.
4th, above-mentioned STA utilizes back off mechanism competitive channels, if channel idle, STA sends PS-Poll frames (one The frame that kind IEEE 802.11 is defined) request data.
The division of labor and switching between the above-mentioned five kinds of states of the present embodiment are fully understood for ease of those skilled in the art, will be upper Five kinds of states are stated further to be summarized as follows：
(1)Deep Doze：Because NDN is driven based on receiving terminal, only Consumer sends data just can be from Deep Doze states wake up.When PIT tables for it is empty when (PIT=0), STA to AP send null frame (NULL Frame) subsequently into Deep Doze states.Another mark that STA wakes up from Deep Doze states is its own listening interval cycle (Listen interval,LI).After the LI cycles are reached, STA, which can wake up, checks the PIT tables of itself and reception Beacon frames.
(2)Light Doze：If STA in Light Doze states, illustrates that STA waits pending data to return and each Beacon periodic awakenings receive TIM.If TIM is empty (TIM=0), represent that AP does not cache the data of the STA.STA will enter Light Doze states.If PIT=0, represent that STA does not have data to return or PIT entries are expired, STA is then directly entered Deep Doze states.
(3)Idle Listening：If STA enters Idle states, illustrate there is data latency return, STA intercepts channel. If PIT=1 and TIM=1, the data of the STA are indicated on AP, and STA utilizes back off mechanism competitive channels, if letter Road is idle, then STA sends PS-Poll frame request datas；If channel busy, it is next that STA enters the wait of Light Doze states The individual Beacon cycles carry out channel competition until having received data.If PIT=1 and TIM=0, represent that AP does not cache the STA Data, then STA be directly entered the pending datas such as Light Doze states.If PIT=0, then it represents that the data mistake of STA requests Phase, then STA be directly entered Deep Doze states.
(4)Tx：When STA is in transmission state, Light Doze states are initially entered after data have been sent, wait pending data Return.
(5)Rx：If STA is in reception state, illustrate that channel is arrived in STA competitions, STA sends PS-Poll frames to AP requests Data, until More data positions are equal to 0, expression has received all data.STA checks again for whether PIT is empty, if PIT is Sky, STA are then directly entered Deep Doze states；If PIT does not enter Light Doze states for sky, STA.
To sum up, the present embodiment utilizes NDN architected features, and unsatisfied Interest, i.e. table are determined whether by PIT tables Show whether STA has the expected Data messages reached, can more fine granularity distinguish STA power consumption state；Therefore, by existing dormancy State is further subdivided into Light Doze states and Deep Doze states, is asked with solving wireless NDN terminal under environment energy consumption Topic.In other words, i.e.,：
In order that obtaining STA more effectively enters NDN-PSM mechanism, increase Light Doze states are distinguished each with more fine granularity State, STA determines whether to anticipate the data message reached using its PIT status information, and then can utilize NDN-PSM machines System allows STA more times in a dormant state, further improves mobile terminal STA energy consumption saving.Meanwhile in order to reduce number Postpone according to returning, by etc. the STA of data to be received switch to Light Doze states, so not only ensure that STA energy-conservation, and And at utmost reduce the delay of data.
Embodiment 2
The present embodiment discloses a kind of STA for performing above-described embodiment correlation method, is carried out for AP corresponding to NDN networks Interaction is saved with realizing.
The present embodiment STA：For being five kinds of states by the PSM mode divisions of itself, it is respectively：Deep Doze states, Light Doze states, Idle Listening states, Tx states and Rx states；Then in conjunction with Beacon cycles, local PIT Table and the TIM information transmitted by corresponding AP switch between five kinds of states, and specific switching includes：
STA creates Interest, checks in local CS whether there is corresponding Interest data, if so, then returning to number According to；If not provided, the prefix of the Interest and corresponding interface are established into a new entry increases in PIT tables, then Send Interest to corresponding AP；Now, STA PIT=1, STA enter Light Doze states；
When STA is in Light Doze, whether there is number in the TIM transmitted by the corresponding AP of each Beacon periodic awakenings inspection According to return；If TIM=0, data are represented also without AP is returned, STA continues in Light Doze states；If PIT=1 and TIM=1, represent that data have returned to AP, then STA switches to Idle Listening states；
When in Idle Listening states, the channel between STA competitions and corresponding AP, if not competing letter Road, then switch to Light Doze states；If channel, conversion to Tx states are arrived in competition；
When in Tx states, STA is to corresponding AP request datas, after all data have been received, check again for PIT whether be 0, if PIT=0, into Deep Doze states；If PIT=1 and TIM=0, into Light Doze states；
When in Deep Doze states, the wake-up period of acquiescence at least twice in Beacon cycles more than, and needing It is waken up when sending Interest.
Similarly, the present embodiment STA can also use following improvement or specifically any one in executive measure or any group Close：
1st, when above-mentioned STA is in Light Doze, check whether PIT entries are expired by STA, if expired, PIT=is set 0, and enter Deep Doze states.
2nd, when in Tx states, above-mentioned STA passes through phase in packet transmitted by corresponding AP when to corresponding AP request datas The bit identification answered judges whether all data receive.I.e. by increasing extra bit identification in the packet transmitted by AP Whether (such as More data positions in subsequent embodiment) has more data, so as to reduce extra wait IL, so can Whether the data whether " precognition " has data to come and ask have been transmitted, and can reduce the IL times and disappear so as to save energy Consumption.
3rd, above-mentioned STA sends null frame to inform AP before Deep Doze states are switched to corresponding AP.
4th, above-mentioned STA utilizes back off mechanism competitive channels, if channel idle, STA sends PS-Poll frames (one The frame that kind IEEE 802.11 is defined) request data.
To sum up, in the present embodiment, in order that STA more effectively enters NDN-PSM mechanism, increase Light Doze states with More fine granularity distinguishes each state, and STA determines whether to anticipate the data message reached using its PIT status information, and then STA more times can be allowed using NDN-PSM mechanism in a dormant state, further improve mobile terminal STA energy consumption section About.Meanwhile in order to reduce data return latency, by etc. the STA of data to be received switch to Light Doze states, so not only STA energy-conservation is ensure that, and at utmost reduces the delay of data.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims (10)

  1. A kind of 1. WLAN energy-saving method based on NDN frameworks, it is characterised in that including：
    It is five kinds of states by the PSM mode divisions between the STA and AP of NDN networks, is respectively：Deep Doze states, Light Doze states, Idle Listening states, Tx states and Rx states；
    TIM information transmitted by each STA combinations Beacon cycles, local PIT tables and corresponding AP is in five kinds of states Between switch over, specific switching includes：
    STA creates Interest, and whether in local CS have corresponding Interest data, if so, then returning to number if checking According to；If not provided, the prefix of the Interest and corresponding interface are established into a new entry increases in PIT tables, then Send Interest to corresponding AP；Now, the PIT=1 of the STA, STA enter Light Doze states；
    When the STA is in Light Doze, whether the TIM transmitted by the corresponding AP of each wake-up period inspection in setting has number According to return；If TIM=0, data are represented also without AP is returned, STA continues in Light Doze states；If PIT=1 and TIM=1, represent that data have returned to AP, then STA switches to Idle Listening states；
    When in Idle Listening states, the channel between the STA competitions and corresponding AP, if not competing letter Road, then switch to Light Doze states；If channel, conversion to Tx states are arrived in competition；
    When in Tx states, the STA is to corresponding AP request datas, after all data have been received, check again for PIT whether be 0, if PIT=0, into Deep Doze states；If PIT=1 and TIM=0, into Light Doze states；
    When in Deep Doze states, the wake-up period of default setting is integral multiple more than Beacon cycle at least twice, and It is waken up when needing and sending Interest；When in Light Doze states, the wake-up period of setting is described Beacon weeks The integral multiple of phase；And the STA corresponds to the wake-up period of Light Doze states less than or equal to corresponding Deep Doze states Wake-up period；
    Wherein, PIT=1, the PIT tables for representing corresponding STA are not sky, that is, have data to need to return；Conversely, represent that corresponding STA does not have There are the data to be asked or PIT entry expired；And
    TIM=1, represent that corresponding AP has cached corresponding STA data；Conversely, represent that corresponding AP does not receive corresponding STA number According to.
  2. 2. the WLAN energy-saving method according to claim 1 based on NDN frameworks, it is characterised in that as the STA In Light Doze, the STA checks whether PIT entries are expired, if expired, sets PIT=0, and enter Deep Doze State.
  3. 3. the WLAN energy-saving method according to claim 1 based on NDN frameworks, it is characterised in that when in Tx shapes During state, the STA is judged all when to corresponding AP request datas by corresponding bit identification in packet transmitted by corresponding AP Whether data receive.
  4. 4. the WLAN energy-saving method according to claim 1 based on NDN frameworks, it is characterised in that the STA exists Before being switched to Deep Doze states, null frame is sent to corresponding AP.
  5. 5. the WLAN energy-saving method according to claim 1 based on NDN frameworks, it is characterised in that the STA profits With back off mechanism competitive channels, if channel idle, STA sends PS-Poll frame request datas.
  6. 6. a kind of STA, interacted for AP corresponding to NDN networks, it is characterised in that the STA：For by itself PSM mode divisions are five kinds of states, are respectively：Deep Doze states, Light Doze states, Idle Listening states, Tx states and Rx states；Then in conjunction with the TIM information transmitted by Beacon cycles, local PIT tables and corresponding AP described five Switched between kind state, specific switching includes：
    STA creates Interest, and whether in local CS have corresponding Interest data, if so, then returning to number if checking According to；If not provided, the prefix of the Interest and corresponding interface are established into a new entry increases in PIT tables, then Send Interest to corresponding AP；Now, the PIT=1 of the STA, STA enter Light Doze states；
    When the STA is in Light Doze, whether the TIM transmitted by the corresponding AP of each wake-up period inspection in setting has number According to return；If TIM=0, data are represented also without AP is returned, STA continues in Light Doze states；If PIT=1 and TIM=1, represent that data have returned to AP, then STA switches to Idle Listening states；
    When in Idle Listening states, the channel between the STA competitions and corresponding AP, if not competing letter Road, then switch to Light Doze states；If channel, conversion to Tx states are arrived in competition；
    When in Tx states, the STA is to corresponding AP request datas, after all data have been received, check again for PIT whether be 0, if PIT=0, into Deep Doze states；If PIT=1 and TIM=0, into Light Doze states；
    When in Deep Doze states, the wake-up period of default setting is integral multiple more than Beacon cycle at least twice, and It is waken up when needing and sending Interest；When in Light Doze states, the wake-up period of setting is described Beacon weeks The integral multiple of phase；And the STA corresponds to the wake-up period of Light Doze states less than or equal to corresponding Deep Doze states Wake-up period；
    Wherein, PIT=1, the PIT tables for representing corresponding STA are not sky, that is, have data to need to return；Conversely, represent that corresponding STA does not have There are the data to be asked or PIT entry expired；And
    TIM=1, represent that corresponding AP has cached corresponding STA data；Conversely, represent that corresponding AP does not receive corresponding STA number According to.
  7. 7. STA according to claim 6, it is characterised in that when the STA is in Light Doze, the STA is also used In：Check whether PIT entries are expired, if expired, PIT=0 is set, and enters Deep Doze states.
  8. 8. STA according to claim 6, it is characterised in that when in Tx states, the STA is additionally operable to：To corresponding AP During request data, judge whether all data receive by corresponding bit identification in packet transmitted by corresponding AP.
  9. 9. STA according to claim 6, it is characterised in that the STA is additionally operable to：It is being switched to Deep Doze states Before, send null frame to corresponding AP.
  10. 10. STA according to claim 6, it is characterised in that the STA is additionally operable to：Competed and believed using back off mechanism Road, if channel idle, STA sends PS-Poll frame request datas.
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