CN1525695A - Switching method for Media Access Control (MAC) protocol of wireless network and apparatus thereof - Google Patents
Switching method for Media Access Control (MAC) protocol of wireless network and apparatus thereof Download PDFInfo
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- CN1525695A CN1525695A CNA031053327A CN03105332A CN1525695A CN 1525695 A CN1525695 A CN 1525695A CN A031053327 A CNA031053327 A CN A031053327A CN 03105332 A CN03105332 A CN 03105332A CN 1525695 A CN1525695 A CN 1525695A
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Abstract
The invention is a converting device for a kind of wireless local network media access control protocol, which includes a wire network interface, a wireless network interface, a storing element and a calculating unit. It exchanges signal with the wire network through a wire network interface, at the same time, it exchanges signal with exterior other wireless network station with wireless mode through the wireless network interface, thus the converting device becomes an access point between the wire network and wireless network station; the character lies in: it sets a channel suing state table and a multi-channel transmission mode state table in memory component, in order to record the transmission state between all the wireless network station and the time of channel using and channel releasing, and provides relative station control package in order to make it can convert from a shared channel to a preset data channel and carry on data parallel transmitting, thus, it can increase the wireless frequency width between all the wireless network station, saves data transmission time and generates more larger parallel transmission quantity.
Description
Technical field
The invention relates to a network media access control (Media Access Control, protocol switching method MAC) and device; Especially referring to provides a kind of switching device shifter under the framework of basic formula (infrastructure) WLAN, allow the interior all portable work stations of network all can see through the coordination and the control of this device, mutual data transmission on different channels, and allow the utilization of network bandwidth be increased.
Background technology
(the Institute of Electrical and ElectronicsEngineers of U.S. electronic motor Engineering society, IEEE), in the international wireless LAN standard that 802 802.11 research groups that form are in the works formulated, can generally be divided into the WLAN (Ad HocWLAN) of basic formula WLAN (Infrastructure WLAN) and non-basic formula about the operating mode aspect of WLAN.Invent the apparatus and method that provided in this case, just applicable to aforesaid basic formula WLAN.
In at present known basic formula WLAN, between its mobile wireless work station and the world-wide web (internet), or and network in other wireless stations between transfer of data be to utilize an access point (Access Point AP) provides the function of switching with single channel operating mode (single channel mode); In other words, all mobile wireless work stations are the work of holding (hand-shaking), swap date mutually and passing on the selected fixing shared channel (common channel) of this access point AP.
As shown in Figure 1, the data transfer mode of aforementioned known basic formula WLAN comprises:
One, at first transmission end work station (STA-A) is sent a control news frame that require to transmit (RequestTo Send RTS) is given access point (AP) with the competition channel right to use;
Two, after access point AP correctly receives RTS control news frame, (Clear To Send CTS) also asks it send data news frames (Data Frame) to access point (AP) for transmission end work station (STA-A) to the control news frame that response permission immediately transmits;
Three, collect when errorless when data news frame, access point (AP) is replied control news frames (ACK) of confirming and is given transmission end work station (STA-A), notifies the correctness of this transfer of data and finishes current transport process; And
Four, when the data destination is cable network (10), access point (AP) transfers to wired network interface with this data; Otherwise, if access point (AP) will transfer to wireless network internal work station (STA-B) from the data of transmission end work station (STA-A) according to said procedure.
Aspect Data Link Layer: the Data Link Layer of the communication protocol of LAN (LAN) by medium access control (Media Access Control, MAC) and logical connection control (Logical LinkControl, LLC) two parts constitute.Wherein medium access control (MAC) is the core of the communication protocol of a LAN, can be responsible for by adapter (Network Interface Card), and logical connection control (LLC) then is responsible for by LAN driver (LAN Driver).
Aspect physical layer (Physical Layer): according to the WLAN specification of present IEEE 802.11, the physical layer of its OSI reference pattern (Physical Layer) transmission standard can generally be divided into two kinds of IEEE 802.11b and IEEE 802.11a etc.; Wherein IEEE 802.11b data rate (datarate) comprises 1,2,5.5 and 11Mbps; The frequency band that uses is between between the 2.4GHz to 2.4835GHz, this frequency band is divided into 14 partly overlapping frequency communication channels again, because possibility phase mutual interference (interference) between these channels, so there are three mutual exclusion channels to use to avoid producing interference problem together simultaneously at the most.
Relatively, IEEE 802.11a data rate (data rate) also comprises: 6,12,18,24,36,48 and scope such as 54Mbps, and its service band is 5.15GHz to 5.35GHz and 5.725GHz to 5.825GHz, wherein available channel has 12 more than.So exist, under the IEEE of known techniques 802.11 WLAN specifications, all can only select the channel that immobilizes as the transfer of data purposes in basis formula (infrastructure) WLAN and the foundation-free formula Ad Hoc WLAN, other available channel then is in idle state (idle), causing the waste of wireless network channel in rain, is long-standing shortcoming.
The phenomenon of this frequency range waste often betides in family and the medium-sized and small enterprises wireless network, yet but the application of this type network accounts for the quite high ratio in WLAN market.Therefore the purpose of this case invention is not change under the known IEEE 802.11 WLAN specifications definition framework, the spendable wireless channel frequency range between all wireless network work stations (STAs) that at first proposes to double, saves data transmission period and produces the communication protocol method of bigger parallel transmission amount.
Summary of the invention
The present invention is a kind of changing method and device of WLAN medium access control MAC (Media AccessControl) agreement, comprise a wired network interface, a radio network interface, a memory element and an arithmetic element, utilize its wired network interface and a cable network switching signal, utilize its radio network interface and the mode switching signal of extraneous other wireless network work station simultaneously with radio communication, make whereby switching device shifter become access point between a cable network and the wireless network work station (Access Point, AP); Its characteristics are provided with a channel user mode table and a multichannel transmission mode state table in this memory element, so as to writing down that transmission state between all wireless network work stations and all channels use and channel release time, and control package (including the channel and the temporal information of use) in related work station is provided and makes it can be in the time of setting share channel from one to switch to and carry out the data parallel transmission on the data designated channel (data channel), device and channel switching method can be carried out the function mode of two kinds of wireless switchings (wireless switch) communications protocol whereby:
First kind, hold the formula agreement and be applicable between the wireless network work station and carry out under the accessible and glitch-free environment for both sides hand over; And
Second kind, for tripartite hand over hold the formula agreement be applicable between wireless network work station (STAs) hypertelorism or obstacle is arranged and noisy environment under carry out.
Description of drawings
Fig. 1 is the schematic diagram of a known conventional wireless network, wherein carries out the transfer of data of a single channel pattern between two work stations;
Fig. 2 is the structure block schematic diagram of switching device shifter of the present invention;
Fig. 3 is that formula multichannel mode transfer schematic diagram is held in both sides' friendship between interior two work stations of this case wireless network;
Fig. 4 is that tripartite the friendship held multichannel mode transfer protocol transmission schematic diagram between interior two work stations of this case wireless network;
Fig. 5 is that this case WSMP is applicable to that both sides hand over the formula of holding to control news frame transmission sequential schematic diagram under the barrier-free environment;
Fig. 6 is that this case WSMP has been applicable to that tripartite the friendship held formula control news frame transmission sequential schematic diagram under the obstacle environment.
The figure number explanation:
10 cable networks
20 switching device shifters
21 wired network interface devices
22 radio network interface devices
23 storage devices
2301 channel user mode tables
2302 multichannel transmission mode state tables
24 arithmetic units
STA-A transmission end work station
STA-B receiving terminal work station
Frame is interrogated in the control that RTS requires to transmit
CTS allows to transmit control news frame
The control news frame that ACK confirms
The M-RTS multichannel requires to transmit control news frame
The multichannel of first kind of type of M-RTS1 requires to transmit control news frame
The multichannel of second kind of type of M-RTS2 requires to transmit control news frame
The M-CTS multichannel allows to transmit control news frame
Embodiment
Please consult Fig. 2, the switching device shifter 20 of medium access control MAC agreement of the present invention can be made of a computer or a single-chip, as long as order is comprising a wired network interface device 21, a radio network interface device 22, a storage device and an arithmetic unit.Its objective is and utilize its a wired network interface device 21 and a cable network 10 to carry out the exchange of signal, utilize its radio network interface device 22 and the mode switching signal of extraneous other wireless network work station simultaneously with radio communication, make whereby switching device shifter 20 become access point between a cable network and the wireless network work station (Access Point, AP).
Characteristics of the present invention are to be provided with in this storage device 23 a channel user mode table 2301 and a multichannel transmission mode state table 2302, so as to writing down that transmission state between all wireless network work stations and all channels use and channel release time, and related work station control package (wherein including the channel of use and the information of time) is provided and makes it in the time of setting, switch to the enterprising line data parallel transmission of a data designated channel (data channel) from a shared channel.
Embodiment one
As described above, device and method of the present invention can be under accessible between all wireless network work stations and disturbed condition, this case can be held wireless switching MAC protocol method according to both sides' friendship of IEEE 802.11 basic formula wireless networks and be communicated, please consider in light of actual conditions in Fig. 3 and Fig. 5 and illustrate, the transfer step of its CTC's frame can comprise:
(a), utilize switching device shifter 20 of the present invention construction one intelligent access point AP between all wireless stations;
(b), set up a channel user mode table 2301 in the storage device 23 of this switching device shifter 20, so as to noting down the standby time of all channels;
(c), transmitting a multichannel in transmission end work station (STA-A) requires transmission control news frames (M-RTS) to give switching device shifter 20;
(d), after this switching device shifter 20 listens to this M-RTS, utilize in its arithmetic unit 24 inquiry channel user mode tables 2301 all channel standby times and find out idle the earliest channel;
(e), this switching device shifter utilizes its radio network interface device 22 to transmit a multichannel and allows to transmit control news frames (M-CTS) and (comprise the receiving terminal work station) to all working station, this M-CTS control news frame can comprise the idle channel that AP is specified and the record of zero-time; And
(f), when transmitting terminal work station (STA-A) and receiving terminal work station (STA-B) receive this M-CTS, then switch to and specify data channels (data channel) to make the data parallel transmission in the setting-up time point.
The preferably makes switching device shifter 20 constitute an intelligent access point AP, and sets a fixing shared channel (common channel) and be at war with to obtain the power of transmission as all wireless stations; If when the destination of transfer of data was a work station in the wireless network, transfer of data can utilize other data channels to discharge the resource of sharing channel.Simultaneously, this common frequency channel can provide the usefulness of other wireless stations data transmission to cable network 10.
The preferably, wherein be built in channel user mode table 2301 in this intelligent access point AP and be in order to the channel between record all working station use and channel release time etc. state.The selection of at every turn carrying out channel and time point can go out best channel and suitable channel service time via computation of table lookup.
The preferably, the switching device shifter 20 of wireless switching media access control (MAC) agreement through inventing thus, transfer of data between the wireless network work station can directly transmit and receive, always pass on the competition of extra channel and collision, consumption network channel resource in rain that is caused so as to avoiding data via access point AP.
Embodiment two
Under the situation that obstacle or interference are arranged, this case also can change the tripartite wireless switching MAC agreement of holding of handing over into switches, and please consider in light of actual conditions in Fig. 4 and Fig. 6 to illustrate, and the transfer step of its CTC's frame can comprise:
(a), utilize switching device shifter 20 of the present invention construction one intelligent access point AP between all wireless stations;
(b), set up one in the storage device 23 of this switching device shifter 20 and can differentiate between any two wireless stations multichannel transmission mode state table 2302 and a channel user mode table 2301 to note down all channels standby time;
(c), the multichannel that this transmission end work station (STA-A) transmits first kind of type earlier requires the news frame (M-RTS1) of transmission control to give switching device shifter 20, when if the transmission quality in the state table of switching device shifter 20 between record transmission end work station (STA-A) and the receiving terminal work station (STA-B) can directly transmit, then this access point AP multichannel of transmitting second kind of type requires to transmit control news frames (M-RTS2) and gives receiving terminal work station (STA-B) and transmission end work station (STA-A), and this M-RTS2 control news frame contains takes from data channels that the calculating of channel end user mode table obtains and the data of service time;
Otherwise, if the multichannel transmission mode state table of switching device shifter 20 2302 these transmission ends of record and receiving terminal can't use multichannel to transmit, then can after receiving M-RTS1 control news frame, reply standard CT S control news frame at once and give transmission end work station (STA-A) and require its direct transmission data to give switching device shifter 20, recover the ordered transfer mode of original I EEE;
When (d), the multichannel that receives second kind of type that switching device shifter 20 transmitted when this receiving terminal work station (STA-B) requires to transmit control news frames (M-RTS2), transmitting a multichannel allows control news frames (M-CTS) to this transmission end work station (STA-A) of transmission to add their confirmation, at the same time, switching device shifter 20 also can be listened to this M-CTS control news frame, and revises its channel user mode table in view of the above; Yet if this receiving terminal work station (STA-B) receives only the M-RTS2 that transmits from switching device shifter 20) and when omitting the M-RTS1 that transmits from transmission end work station (STA-A), then reply CTS and to notify it situation of concealed nodes (hidden-node) takes place for switching device shifter 20, make it to be recorded in the multichannel transmission mode state table 2302; After this, just replying CTS control news frame, the access point AP that switching device shifter 20 constitutes requires its direct transmission data to give access point AP for transmission end work station (STA-A), as the ordered raw mode of IEEE;
(e), receive M-CTS when transmission end work station (STA-A), i.e. hold (hand-shaking) success mutually and switch to other between expression and the receiving terminal work station (STA-B) and specify data channels (data channel) transmission data in the time that switching device shifter 20 is set.
The preferably, in the access point AP that switching device shifter 20 is constituted, set all stations and share channel (common channel), obtain the usefulness of the power of transmission for the wireless stations intercropping competition in the wireless network, switching to other with multichannel pattern (multi-channel mode) in the time that sets then specifies data channels (data channel) to carry out wirelessly transmitting data, or in the time can't directly transmitting between transmission end and receiving terminal, can change and adopt the fix control centre of single channel data transmission of single channel pattern.
The preferably, wherein when between all working station barrier being arranged, M-RTS1 is sent to switching device shifter 20 from transmission end work station (STA-A), and utilize arithmetic unit 24 transmission mode table comparisons that incite somebody to action and storage device 23, whether can multichannel pattern (multi-channel mode) operate so as to decision; If in the time of consequently can be, then send M-RTS2 simultaneously to all working station with radio network interface 22 with the multichannel mode operating; Otherwise, send the original ordered CTS control of IEEE news frame to transmission end work station (STA-A), make traditional data transmission pattern that reverts to.
The preferably, wherein when having barrier to exist between two work stations, then make receiving terminal work station (STA-B) send standard transmission and confirm control news frame (CTS) switching device shifter 20, and be recycled to transmission end work station (STA-A), at this moment transmit work station (STA-A) and must get back to single channel pattern (single-channel mode) running, its data will transfer to receiving terminal work station (STA-B) via the access point AP that switching device shifter 20 is constituted.
Certainly, if when having other situation that can't directly transmit to take place between two work stations, can also upgrade transfer mode table between the built-in work station of this intelligent access point AP the cycle, and then attempt again with the multichannel mode operating to promote network efficiency.Therefore, the method and apparatus that this case is carried, the both sides that are applicable to IEEE 802.11 basic formula wireless networks hand over and to hold (be applicable to accessible with interference environment under) to hold (being applicable under obstacle or the interference environment) wireless switching MAC communication pattern with tripartite the friendship.
Please also refer to Fig. 4 and Fig. 5, two figure can understand this case invention and disturbing the MAC protocol method that the inner multichannel of wireless network transmits under the situation of (using the tripartite mode of holding of handing over) in accessible interference (using both sides to hand over the mode of holding) with there being obstacle between transmission end work station, receiving terminal work station and intelligent access point AP thus.
Comprehensive above explanation, this case invention is a kind of wireless switchings MAC protocol method that basic formula WLAN is arranged of the IEEE of meeting 802.11 wireless network specifications definition as can be known, that is a kind of frequency range that can effectively double under this WSMP framework, saves the method for the bigger parallel transmission amount of data transmission period and generation.
Claims (10)
1. the changing method of a wireless network media access control (MAC) agreement, its step comprises:
(a) an intelligent access point AP is set between some wireless stations;
(b) state table of built-in channel use is in this intelligent access point AP;
(c) built-in one can differentiate the state table (promptly whether hiding (hidden) work station between wantonly two work stations of record each other) of multichannel transmission mode between work station in this intelligent access point AP;
(d) being chosen in both sides friendship holds in the wireless handoff protocol of formula, the news frame (M-RTS) that transmits multichannel requirement transmission control in a transmission end work station gives this intelligent access point AP, and finds best channel and service time and utilization to broadcast in the channel use table of this intelligent access point AP and transmit news frames (M-CTS) to all working station; Or
(e) being chosen in tripartite a friendship holds in the wireless handoff protocol of formula, the multichannel that transmits first kind of type of one first kind of type in a transmission end work station requires to transmit this intelligent access point AP of control news frames (M-RTS1), and determines whether use the multichannel pattern to transmit between the work station of this intelligent access point AP in the multichannel transmission mode table;
If it is feasible, the multichannel that finds best channel and service time again and transmit one second kind of type from channel use table requires to transmit control news frames (M-RTS2) to all working station, then returns a multichannel and allow to transmit control and interrogate frames (M-CTS) to this transmission end work station and add their confirmation when the receiving terminal work station receives this M-RTS2 that this intelligent access point AP transmitted;
(f) holding (hand-shaking) success mutually as transmission end work station and receiving terminal work station then switches to other specified channel in setting-up time and transmits data.
2. the changing method of wireless network media access control according to claim 1 (MAC) agreement, wherein this intelligent access point AP is connected with a cable network, and is in the control centre of inner all the wireless stations intercropping multi-channel wireless transmission of this wireless network.
3. the changing method of wireless network media access control according to claim 1 (MAC) agreement, wherein multichannel transmission mode table is to be built in this intelligent access point AP for interior between this wireless stations, and is in order to write down between any two work stations (STAs) whether can carry out the multichannel mode transfer.
4. the changing method of wireless network media access control according to claim 1 (MAC) agreement, wherein this channel user mode table is to be interior this intelligent access point AP that is built in, and in order to the use situation that writes down all channels and channel release time.
5. the changing method of wireless network media access control according to claim 1 (MAC) agreement, wherein this multichannel requires to transmit control news frames (M-RTS) and is sent to this intelligent access point AP from this transmission end work station, and, transmit this multichannel and allow transmission control news frames (M-CTS) to notify transmission end and receiving terminal work station again via the channel of this access point AP decision use and after the time.
6. the changing method of wireless network media access control according to claim 1 (MAC) agreement, wherein the multichannel of this first kind of type requires to transmit control news frames (M-RTS1) and is sent to this intelligent access point AP from this transmission end work station, and inquire about channel and the time that multichannel transmission mode table between built-in work station whether can multichannel pattern (multi-channel mode) running uses with decision with decision via this intelligent access point AP, judge the multichannel of can the multichannel pattern then sending this second kind of type as this intelligent access point AP and require to transmit control news frames (M-RTS2) to all working station; This multichannel of passback allows to transmit control news frame (M-CTS) after this receiving terminal work station receives M-RTS2, notifies this transmission end work station to carry out switching channels and transfer of data whereby.
7. the changing method of wireless network media access control according to claim 1 (MAC) agreement, wherein these multichannel acknowledge control news frames (M-CTS) are in order to confirm whether can multichannel pattern (multi-channel mode) operate between any two work stations, if sure affirmation result promptly can switch to other specified channel from shared channel in setting-up time between the work station that expression is relevant and carry out the data parallel transmission.
8. the switching device shifter of a wireless network media access control (MAC) agreement comprises at least:
One wired network interface device carries out the exchange of signal or news frame for this switching device shifter and a cable network;
One radio network interface device is for this switching device shifter and mode switching signal or the news frame of extraneous other Wi-Fi work station with radio communication;
One storage device is that a built-in channel user mode table and the state table that can differentiate the multichannel transmission mode between this other wireless network work station (promptly between wantonly two work stations of record whether hiding each other (hidden) work station) is in this intelligent access point AP; And
One arithmetic unit, in order to compare the state table of this multichannel transmission mode, whether can multichannel pattern (multi-channel mode) operate between any two work stations, externally send relative signal or news frame so as to confirming and see through this radio network interface device.
9. the switching device shifter of wireless network media access control according to claim 8 (MAC) agreement is that the state table in built-in this channel user mode table of a computer and this multichannel transmission mode constitutes.
10. the switching device shifter of wireless network media access control according to claim 8 (MAC) agreement is that the state table by built-in this channel user mode table of a single-chip (Single Chip) and this multichannel transmission mode is constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA031053327A CN1525695A (en) | 2003-02-24 | 2003-02-24 | Switching method for Media Access Control (MAC) protocol of wireless network and apparatus thereof |
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| CNA031053327A CN1525695A (en) | 2003-02-24 | 2003-02-24 | Switching method for Media Access Control (MAC) protocol of wireless network and apparatus thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453260B (en) * | 2007-11-29 | 2013-02-13 | 上海寰创通信科技股份有限公司 | Radio channel management method for wireless Locale Area Network equipment |
| CN101189888B (en) * | 2004-12-03 | 2013-07-10 | 思科技术公司 | System and method for providing a handoff leg associated with a preexisting leg in a network environment |
| CN104797011A (en) * | 2014-01-20 | 2015-07-22 | 华为终端有限公司 | Data transmission method of dual-frequency mobile WiFi terminal and mobile WiFi terminal |
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2003
- 2003-02-24 CN CNA031053327A patent/CN1525695A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189888B (en) * | 2004-12-03 | 2013-07-10 | 思科技术公司 | System and method for providing a handoff leg associated with a preexisting leg in a network environment |
| CN101453260B (en) * | 2007-11-29 | 2013-02-13 | 上海寰创通信科技股份有限公司 | Radio channel management method for wireless Locale Area Network equipment |
| CN104797011A (en) * | 2014-01-20 | 2015-07-22 | 华为终端有限公司 | Data transmission method of dual-frequency mobile WiFi terminal and mobile WiFi terminal |
| CN104797011B (en) * | 2014-01-20 | 2018-11-30 | 华为终端有限公司 | The data transmission method of dual-band mobile WiFi terminal and mobile WiFi terminal |
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