CN1286299C - Method and device for transmitting network sound in radio local area network - Google Patents
Method and device for transmitting network sound in radio local area network Download PDFInfo
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Abstract
The present invention discloses a method for transmitting network voice in a wireless local area network. The method comprises the steps that different dispatching modes of voice signal frames and data signal frames are set; the maximum number of voice subscribers allowed by an access point is obtained according to the set different dispatching modes of the voice signal frames and the data signal frames; the transmission of the network voice is established according to the maximum number of the voice subscribers allowed by the network access point. By utilizing the method, the bandwidth of a wireless access point can be fully utilized, the IP voice client capacity of the wireless local area network can be increased, and reliable service guarantee can be provided for subscribers.
Description
Technical field
The present invention relates to network communications technology field, be specifically related to a kind of in WLAN (wireless local area network) the method and the device of transmission network voice.
Background technology
At present, along with the development of Internet and multimedia communication, voip technology is large-scale application in enterprise communication.VoIP is based upon the technical packetizing of IP, digitlization transmission technology, its basic principle is: by voice compression algorithm speech data is carried out compressed encoding and handle, then these speech datas are packed by related protocols such as IP, through IP network data packet transmission is arrived reception ground, again these VoPs are stringed together, after the decoding decompression processing, revert to original voice signal, thereby reach the purpose that transmits voice by IP network.The development of voip technology has two general orientation, and the one, follow H.323 standard of International Telecommunication Association, the 2nd, follow the Session Initiation Protocol (Session initiation Protocol) of IETF (Internet engineering duty group).The application of voip technology can provide, better service more than traditional business, for operator provides more value-added service.
The appearance of WLAN (WLAN (wireless local area network)) makes people break away from the constraint of netting twine by radio network technique, inserts the Internet like a cork.The mobile that develops into the Computer Data Communication terminal of WLAN, individualized etc. is newly used, and a kind of means easily and efficiently are provided.WLAN is the network that utilizes wireless communication technology to set up in certain subrange, is the product that computer network combines with wireless communication technology.The effective ways of its use wireless multiple access channel come the communication between the support media.WLAN only supports data communication, as LAN (Local Area Network), does not directly provide the business of voice communication, if utilize the WLAN (wireless local area network) transferring voice, then needs to adopt voip technology.
H.323 or Session Initiation Protocol, RTP (RTP)/RTCP (RTCP Real-time Transport Control Protocol), TCP (transmission control protocol)/IP (Internet protocol) and 802.11 standard series that realize MAC (medium access control) sublayer and PHY (physics) layer function use at wireless local network VoIP, relate generally to following agreement:.But 802.11 agreements lack QoS (service quality) mechanism guarantees that directly cause when network congestion, voice service will can not get priority treatment, like this, the interruption of voice service will take place.At present, 802.11e provides QoS to guarantee in WLAN (wireless local area network) by the mode of a plurality of formations and empty competition.802.11e purpose be to guarantee for the multimedia service in the WLAN (wireless local area network) provides QoS, but need realize that efficient is low and can not effectively utilize bandwidth of radio access points by twice scheduling.
Summary of the invention
The objective of the invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of in WLAN (wireless local area network) the method and the device of transmission network voice, by voice service and data, services are separately dispatched, only need once scheduling to realize, to make full use of bandwidth of radio access points, improve the capacity of ip voice client in the WLAN (wireless local area network), and provide reliable service guarantees for the user.
The objective of the invention is to be achieved through the following technical solutions:
A kind of in WLAN (wireless local area network) the method for transmission network voice, described method comprises:
The different scheduling modes that A, setting voice signal frame and data frame signal adopt utilize centralized control agreement polling dispatching speech frame in contention free period, utilize distributed csma/collision avoidance protocol data dispatching frame in the competition phase;
B, determine the polling cycle of described polling dispatching speech frame, and obtain the voice user's that access points allows maximum number according to polling cycle according to the bandwidth that sends time that terminal encodes to voice and AP;
The transmission that C, the voice user's that allows according to the described access points that obtains maximum number is set up voice-over-net.
Alternatively, described step B comprises: the maximum number of obtaining the voice user that access points allows satisfies:
N＝{T-T
PIFS-(T
beacon+T
SIFS+T
CF-END)-(T
DIFS+T
DATA+T
SIFS+T
ACK)}/(T
VOIP+ACK+POLL+T
SIFS+T
VOIP+ACK+T
SIFS)，
Wherein, T is the polling cycle of described access points, T
PIFSBe the time span of PCF frame period, T
BeaconBe the time span of beacon frame, T
SIFSBe the time span of short frame period, T
VOIP+ ACK+POLLBe the time span of speech data, response and poll frame, T
VOIP+ACKBe the time span of speech data and response frame, T
CF-ENDBe the time span of CFP end frame, T
DIFSBe the time span of DCF frame period, T
DATABe the time span of Frame, T
ACKTime span for response frame.
Preferably, described step C comprises:
C1, the voice user's that allows according to the described Network Access Point that obtains maximum number is set up voice user's statistical form;
C2, set up voice user's registration table;
C3, when the voice user asks to connect, be described voice user's allocated channel according to voice user's statistical form of described foundation, and in described voice user's registration table and voice user's statistical form, increase information corresponding to described voice user;
C4, when the voice user goes to connect, delete in described voice user's registration table and the voice user's statistical form information corresponding to described voice user.
Alternatively, described step C3 comprises:
When the voice user asks to connect, judge whether to judge the current idle voice channel that whether has for new user and according to described user's statistical form according to described voice user's registration table;
For new user and when idle voice channel is arranged, distributing idle channel is that described voice user connects;
In described voice user's registration table and voice user's statistical form, increase information corresponding to described voice user.
Preferably, described voice user's registration table comprises: voice user's call number, voice user's Media Access Control address.
Alternatively, described voice user's statistical form comprises: the voice user's who allows maximum number, the actual voice user's number that connects.
A kind of in WLAN (wireless local area network) the device of transmission network voice, comprising:
The scheduling setting device, be used for the voice signal frame is set different scheduling modes with data frame signal, and utilize centralized control agreement polling dispatching speech frame in contention free period, utilize distributed csma/collision avoidance protocol data dispatching frame in the competition phase;
Judgment means is used for determining according to the bandwidth that sends time that terminal encodes to voice and AP the polling cycle of described polling dispatching speech frame, and obtains the voice user's that access points allows maximum number according to polling cycle;
Communicate to connect apparatus for establishing, be used for the transmission that the voice user's that allows according to the described Network Access Point that obtains maximum number is set up voice-over-net.
By above technical scheme provided by the invention as can be seen, the present invention is by the dispatching method of speech frame under the centralized control in the access points of optimizing WLAN, the inter-packet gap size of VoP and the length of the super frame in the access points are adapted, make the voice user can visit shared channel in real time, maximally utilise the bandwidth of AP (access points), make ip voice client maximum capacity among the WLAN; By guaranteeing mechanism for the voice user provides QoS (service quality), for the voice user provides reliable service at link layer.
Description of drawings
Fig. 1 is the system group network schematic diagram that transmits voice-over-net in the WLAN (wireless local area network);
Fig. 2 is the principle schematic of speech frame and the different dispatching methods of Frame in the inventive method;
Fig. 3 is the realization flow figure of the inventive method;
Fig. 4 is the state exchange schematic diagram of voice service in the access points during the inventive method is used;
Fig. 5 is the workflow schematic diagram of voice user of the present invention when asking to connect;
Fig. 6 is that voice user of the present invention goes to connect or the workflow schematic diagram when going to authenticate;
Fig. 7 is the networking schematic diagrames of apparatus of the present invention in application.
Embodiment
The core of the inventive method is by optimizing among the AP (access points) in 802.11 standards under PCF (centralized control) method to the speech frame scheduling, with speech frame and separately scheduling of Frame, speech frame is carried out the polling dispatching of center control in contention free period, adopt Distributed C MA/CA (csma/conflict is avoided) agreement to make Frame share wireless medium in the competition phase, maximally utilise the bandwidth of access points, make ip voice client maximum capacity in the WLAN (wireless local area network).
Those of ordinary skills know that the mode of operation of WLAN (WLAN (wireless local area network)) mainly contains two kinds: infrastructure mode and peer-to-peer network pattern.Infrastructure mode is the center with the WAP (wireless access point), at this moment the WAP (wireless access point) of WLAN, can be regarded as the extension of cable network, as long as in the coverage of WLAN, the equipment (being commonly referred to wireless stations) of being furnished with wireless network card, can link to each other by the wired or wireless backbone network in WAP (wireless access point) and outside, the WLAN access point is equivalent to wireless hub.In the infrastructure mode of operation, each wireless stations can only be associated with a WAP (wireless access point) at synchronization, and WAP (wireless access point) and the wireless stations related with it have just been formed a basic service set.Each basic service set all has a basic service set identifier.In 802.11 standards, the basic service set identifier is exactly MAC (medium access control) address of access points.Wireless stations adopts the basic service set identifier to be associated with this WAP (wireless access point) exactly.When needs are expanded the coverage area or increase the number of users of wireless stations, several WAP (wireless access point) basic service set separately can be combined into a distributed network system (DNS), promptly can be described as extended service set.Extended service set is meant by a plurality of access points and connects the structured network that their distributed system is formed that all access point AP must share the same set identifier of activating business.
The system group network structure of transmission voice-over-net as shown in Figure 1 in WLAN (wireless local area network).Wherein,
The VoIP voice terminal is used to offer the user radio voice service;
Access points AP is used to the VoIP voice terminal to provide and carries out wireless access function;
Server has service functions such as AAA;
Internet comprises router, can transmit and the routing voice bag.
In the IEEE802.11 standard, defined the method for two kinds of wireless medium access controls, be respectively: DCF (distributed access mode) and PCF (centralized control).Wherein,
The distributed access mode adopts has the Carrier Sense Multiple Access avoided of conflict, is the main access protocal of sharing wireless medium between the work station of physical layer compatibility and the access node automatically.802.11 network using CSMA/CA agreement is carried out the share and access of wireless medium, carrier sense can allow MAC layer monitoring medium be in busy or idle condition.Physical layer (PHY) provides the physical detection of channel, and the physical channel assessment result is sent to the MAC layer, as a factor determining channel condition information.The MAC controlling mechanism utilizes the reservation information of duration field in the frame to realize the Virtual Monitoring agreement, and this reservation information is issued the message that this work station will working medium to every other work station.The MAC layer is monitored the duration field of all mac frames, if the value that listens to is greater than current network allocation vector (NAV) value, with regard to the NAV with this this work station of information updating.NAV works together just as a counter, and initial value is the duration field value of the last frame that sends, countdown to 0 then.When the value of NAV is 0, and the PHY controlling mechanism shows when idle channel is arranged, and this work station just can transmit frame.
The central site network control mode is a uncontested access protocal, and it is a kind of visit based on priority level, is applicable to that node is equipped with the network of point control device.The PCF mode provides the uncompetitive frame of optional priority to transmit.Under this working method, by the transmission of master controller control from the frame of work station, the control of master controller is all obeyed at all working station, and their NAV value was set in the time started of each contention free period.Certainly, for uncompetitive poll (CF-Poll frame), work station can be responded selectively.Begin in contention free period, master controller at first obtains the control of medium, and the time span of following the PCF frame period conducts interviews to medium; Therefore, master controller can be waited for than being operated in transmission shorter under the distributed control mode at interval in contention free period retentive control power.
The inventive method has kept mac-layer protocol when the application of wireless local network VoIP, by the different dispatching methods to speech frame and Frame, provide QoS service guarantees mechanism at link layer for VoIP.
Below with reference to Fig. 2 the different dispatching methods of speech frame in the inventive method and Frame are elaborated:
In contention free period speech frame is carried out the polling dispatching that the center is controlled, so the time span of contention free period is voice packet required time and CFP end frame time sum that beacon frame time, PCF interFrameGap time, poll and response time, poll transmit the ip voice client of heap(ed) capacity.
Adopt Distributed C MA/CA (csma/conflict is avoided) agreement to make Frame share wireless medium in the competition phase, its length is the time of transmitting a packet under the situation of non-fragmentation.
In Fig. 2, Beacon is a beacon frame, and under the PCF mode, it shows the beginning of a contention free period; Poll is a poll frame, and under the PCF mode, AP sends this frame to certain special sound IP portable terminal, authorizes this terminal to send a speech frame to any destination; Ack is an acknowledgement frame; SIFS is the shortest frame; The frame that CF-END finishes for the expression contention free period; P
1Speech frame for the AP forwarding; S
1The speech frame that sends for the wireless speech terminal.In the contention free period transmission voice frames, at competition phase transferring data frames.
One of service quality major parameter that influences the VoIP voice is the one-way system time delay, comprises algorithm time delay, calculation delay, multiplexing time delay and propagation delay time, and rough estimate is at least 3 frame lengths.Under centralized control, the length that it is exactly super frame that terminal receives two intervals between the speech frame, the just polling cycle of AP.And the interval between two speech frames is by sending time and the decision of AP throughput that terminal is encoded to voice.Delay variation in the network can come level and smooth influence to speech quality by wobble buffer.The size of the payload of RTP (RTP) bag of most commercial IP phone is 20ms or 30ms.According to Fig. 2, establishing T is the polling cycle size, T
PIFSBe the time span of PCF frame period (PIFS), T
BeaconBe the time span of beacon frame, T
SIFSBe the time span of short frame period (SIFS), T
VOIP+ACK+POLLBe the time span of speech data, response and poll frame, T
VOIP+ACKBe the time span of speech data and response frame, T
CF-ENDBe the time span of CFP end frame, T
DIFSBe the time span of DCF frame period (DIFS), T
DATABe the time span of Frame, T
ACKBe the time span of response frame, n is the ip voice user's that allows of access points a heap(ed) capacity.Polling cycle T=T then
PIFS+ T
Beacon+ T
SIFS+ (T
VOIP+ ACK+POLL+ T
SIFS+ T
VOIP+ACK+ T
SIFS) * n+T
CF-END+ T
DIFS+ T
DATA+ T
SIFS+ T
ACK, promptly can calculate the ip voice client's that AP allows among the WLAN heap(ed) capacity by this formula.
As shown in Figure 2, the present invention has optimized among the AP dispatching method of speech frame under the PCF, the inter-packet gap length of VoP and the length of the super frame among the AP is adapted, under PCF, the length that it is exactly super frame that terminal receives two intervals between the speech frame, the just polling cycle of AP; Interval between two speech frames is by sending time that terminal encodes to voice and the bandwidth decision of AP, in the scope of AP bandwidth, the size (20ms or 30ms) of payload that can get the RTP bag of most commercial IP phone is the length of super frame, can obtain this value by software simulation or emulation experiment, make voice user's terminal can visit shared channel in real time; Thereby, the voice user guarantees mechanism for providing QoS.
In order to make those skilled in the art person understand the present invention better, the present invention is described in further detail below in conjunction with flow chart shown in Figure 3.May further comprise the steps:
Step 301: set the different scheduling modes of voice signal frame and data frame signal, be specially: utilize centralized control agreement polling dispatching voice signal frame in contention free period; Utilize distributed csma/collision avoidance protocol data dispatching signal frame in the competition phase.
Step 302: the maximum number of obtaining the voice user that access points allows according to the different scheduling modes of voice signal frame of setting and data frame signal.The computational methods of the voice user's who allows maximum number are referring to noted earlier.
Step 303: the voice user's who allows according to the Network Access Point that obtains maximum number is set up voice user's statistical form.The structure of voice user's statistical form is as shown in table 1 below, is made up of voice user's call number and voice user's MAC Address.In this table, register the physical address of oneself when voice user's success identity, connection and after distributing voice channel; AP puts in order according to the physical address in this table and by it wireless ip voice terminal is carried out poll.
Table 1:
| Voice user's call number | Voice user's MAC Address |
| 0 | FFFFFFFFFFFF |
| 1 | …… |
| …… | …… |
Step 304: set up voice user's registration table.The structure of voice user's registration table is as shown in table 2 below, and the voice user's who is allowed by access points a maximum number value and a current speech user numerical value are formed.Whether the voice user is littler than its maximum with currency in being connected this table of back inquiry at success identity, less than its maximum, then distributes voice channel as if currency.
Table 2:
| Voice user's maximum number | Vmax |
| Current speech user's number | x |
Step 305: when the voice user asks to connect, be voice user's allocated channel, and in voice user's registration table and voice user's statistical form, increase information corresponding to described voice user according to voice user's statistical form of setting up.
Step 306: when the voice user goes to connect, delete in described voice user's registration table and the voice user's statistical form information corresponding to described voice user.
The conversion that utilizes the inventive method voice service state of access points in WLAN transmission VoIP process is as shown in Figure 4: state 1 is initial unverified and not-connected status; State 2 is to have authenticated and not-connected status; State 3 has authenticated and connection status; State 4 be authenticate, the state of connection status and successful allocation of channel resources may.
The process of the voice user being asked to be connected and going to connect or go to authenticate below with reference to Fig. 5 and Fig. 6 is further described.
With reference to Fig. 5, Fig. 5 is the workflow schematic diagram of voice user of the present invention when asking to connect, and may further comprise the steps:
Step 501: initiated access access point, comprise: initialization voice user registration table and voice user's statistical form, by the 0th MAC Address in voice user's registration table is initialized as FFFFFFFFFFFF, the number in voice user's statistical form is initialized as 0 realizes; The channel allocation sign is set.
Step 502: the voice user asks to insert.
Step 503: access authentication.
Step 504: the voice user sends the association request frame application after by access authentication and connects.
Step 505: parse the physical address of association request frame, realize, if the user that request connects then reads source address in this locality, if the user that request connects then reads destination address in the other places by the source address or the destination address that read in the association request frame frame head.
Step 506: judge whether the user that this request connects is new voice user, realizes by voice inquirement user registration table (table 1).
If not new speech user, then enter step 511: the data value channel allocation sign that will represent the channel allocation state is composed to true, enters step 512 then: process ends.
If new speech user then enters step 507: the Boolean type data value channel allocation sign that will represent the channel allocation state is composed to false.
Step 508: whether the number of judging the voice user realizes by currency and its maximum that compares in voice user's statistical form (table 2) less than its maximum.
If voice user's number then enters step 512: process ends greater than its maximum.
If voice user's number then enters step 509: the value of voice user's number is added 1, realize by the currency in voice user's statistical form is added 1 less than its maximum.
Step 510: the MAC Address that in voice user's registration table, increases this user.
Step 511: the data value channel allocation sign that will represent the channel allocation state is composed to true.
Step 512: process ends.
Refer again to Fig. 6, Fig. 6 is that voice user of the present invention goes to connect or the workflow schematic diagram when going to authenticate, and may further comprise the steps:
Step 601: the voice user sends and goes to connect or go authentication request frames.
Step 602: resolve away and connect or go MAC Address in the authentication request frames, connect or go source address or destination address in the authentication request frames frame head to realize by reading, if the user that request is gone to connect or gone to authenticate then reads source address in this locality, if the user that request is gone to connect or gone to authenticate then reads destination address in the other places.
Step 603: whether the number of judging the voice user realizes by currency and its maximum that compares in voice user's statistical form greater than 0.
If voice user's number then enters step 607: finish this flow process less than 0.
If voice user's number greater than 0, then enters step 604: judge whether the user that this request is gone to connect or gone to authenticate is registered voice user, realizes by voice inquirement user registration table (table 1).
If not registered voice user then enters step 607: finish this flow process.
If registered voice user then enters step 605: this user's of deletion MAC Address in voice user's registration table.
Enter step 606: the value of voice user's number is subtracted 1, realize by the numerical value of the current speech user in voice user's statistical form (table 2) is subtracted 1.
Enter step 607: finish this flow process.
Below by an application example above-mentioned flow process is described further.
For example: the length T=30ms of super frame; For the 802.11a agreement, OFDM (OFDM) modulation mode and voice coding modes G.711, maximum customer volume (VUSRmax)=170;
At this moment, voice user's registration table (vusrreg) and voice user's statistical form (vusrtbl) are respectively shown in table 3 and the table 4:
Table 3:
| Voice user's call number | Voice user's MAC Address |
| 0 | FFFFFFFFFFFF |
| 1 | 00FFEEDDCCBB |
| 2 | 0099AABBCCDD |
| 3 | 00AA99BB8877 |
| 4 |
Table 4:
| Voice user's maximum number value (VUSRmax) | 170 |
| Current speech user's numerical value (vusr) | 3 |
The Boolean type data of expression channel allocation state are: channelStatus.
Behind voice user's success identity that a MAC Address is 00778899AABB, begin to connect: at first, parse this user's MAC Address 00778899AABB; Then, to draw the user that this request connects be new voice user to voice inquirement user registration table vusrreg (table 3); The Boolean type data channelStatus value of expression channel allocation state is composed to false; Since VUSRmax=170, vusr=3, and the value of vusr is less than the value of VUSRmax; So with the value vusr=vusr+1 of current speech user number in the table 3, voice user's statistical form becomes as shown in table 6 below; Add this voice user's MAC Address 00778899AABB then in the 4th of table 3, voice user's registration table becomes as shown in table 5 below; The Boolean type data channelStatus value tax that to represent the channel allocation state then is for true; Finish this and connect flow process.
Table 5:
| Voice user's call number | Voice user's MAC Address |
| 0 | FFFFFFFFFFFF |
| 1 | 00FFEEDDCCBB |
| 2 | 0099AABBCCDD |
| 3 | 00AA99BB8877 |
| 4 | 00778899AABB |
Table 6:
| Voice user's maximum number value (VUSRmax) | 170 |
| Current speech user's numerical value (vusr) | 4 |
When MAC Address is that the voice user application of 00778899AABB goes to connect or when going to authenticate: at first, parse this user's MAC Address 00778899AABB; Because vusr=4 in the current speech user statistical form (table 6), the value of vusr shows that greater than 0 this access point also has the voice user to connect; So it is registered voice user that voice inquirement user registration table vusrreg (table 5) draws the user that this request goes to connect or go to authenticate; Then delete 00778899AABB in the 4th of voice user's registration table vusrreg (table 5), voice user's registration table becomes as above shown in the table 3; Then, with a current speech user numerical value vusr=vusr-1 among voice user's statistical form vusrtbl (table 6), voice user's statistical form becomes as above shown in the table 4; Then, finish this flow process.
Fig. 7 is the networking schematic diagrames of apparatus of the present invention in application:
Apparatus of the present invention are formed by dispatching setting device 701, judgment means 702 and communicating to connect apparatus for establishing 703.Wherein, scheduling setting device 701 is used for the voice signal frame is set different scheduling modes with data frame signal, makes in contention free period and utilizes centralized control agreement polling dispatching voice signal frame; Utilize distributed csma/collision avoidance protocol data dispatching signal frame in the competition phase.Judgment means 702 is used for the maximum number that different scheduling modes according to the voice signal frame of described setting and data frame signal obtain the voice user that access points allows; Communicate to connect apparatus for establishing 703, be used for the transmission that the voice user's that allows according to the described Network Access Point that obtains maximum number is set up voice-over-net.
With apparatus of the present invention in access points, when the wireless IP terminals request is conversed, at first connect by the access points application, by server this wireless IP terminals is authenticated with functions such as AAA services, behind the success identity, the transmission of setting up voice-over-net for this terminal by the maximum number that communicates to connect the voice user that apparatus for establishing 703 allows according to the access points that obtains in apparatus of the present invention.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (8)
1, a kind of in WLAN (wireless local area network) the method for transmission network voice, it is characterized in that described method comprises:
The different scheduling modes that A, setting voice signal frame and data frame signal adopt utilize centralized control agreement polling dispatching speech frame in contention free period, utilize distributed csma/collision avoidance protocol data dispatching frame in the competition phase;
B, determine the polling cycle of described polling dispatching speech frame, and obtain the voice user's that access points allows maximum number according to polling cycle according to the bandwidth that sends time that terminal encodes to voice and AP;
The transmission that C, the voice user's that allows according to the described access points that obtains maximum number is set up voice-over-net.
2, according to claim 1 in WLAN (wireless local area network) the method for transmission network voice, it is characterized in that described step B comprises: the maximum number of obtaining the voice user that access points allows satisfies:
N＝{T-T
PIFS-(T
beacon+T
SIFS+T
CF-END)-(T
DIFS+T
DATA+T
SIFS+T
ACK)}/(T
VOIP+ACK+POLL+T
SIFS+T
VOIP+ACK+T
SIFS)，
Wherein, T is the polling cycle of described access points, T
PIFSBe the time span of PCF frame period, T
BeaconBe the time span of beacon frame, T
SIFSBe the time span of short frame period, T
VOIP+ ACK+POLLBe the time span of speech data, response and poll frame, T
VOIP+ACKBe the time span of speech data and response frame, T
CF-ENDBe the time span of CFP end frame, T
DIFSBe the time span of DCF frame period, T
DATABe the time span of Frame, T
ACKTime span for response frame.
3, according to claim 1 and 2 in WLAN (wireless local area network) the method for transmission network voice, it is characterized in that described step C comprises:
C1, the voice user's that allows according to the described Network Access Point that obtains maximum number is set up voice user's statistical form;
C2, set up voice user's registration table;
C3, when the voice user asks to connect, be described voice user's allocated channel according to voice user's statistical form of described foundation, and in described voice user's registration table and voice user's statistical form, increase information corresponding to described voice user;
C4, when the voice user goes to connect, delete in described voice user's registration table and the voice user's statistical form information corresponding to described voice user.
4, according to claim 3 in WLAN (wireless local area network) the method for transmission network voice, it is characterized in that described step C3 comprises:
When the voice user asks to connect, judge whether to judge the current idle voice channel that whether has for new user and according to described user's statistical form according to described voice user's registration table;
For new user and when idle voice channel is arranged, distributing idle channel is that described voice user connects;
In described voice user's registration table and voice user's statistical form, increase information corresponding to described voice user.
5, according to claim 3 in WLAN (wireless local area network) the method for transmission network voice, it is characterized in that described voice user's registration table comprises: voice user's call number, voice user's Media Access Control address.
6, according to claim 5 in WLAN (wireless local area network) the method for transmission network voice, it is characterized in that described voice user's statistical form comprises: the voice user's who allows maximum number, the actual voice user's number that connects.
7, according to claim 6 in WLAN (wireless local area network) the method for transmission network voice, it is characterized in that described step C4 comprises:
Delete in described voice user's registration table Media Access Control address corresponding to described voice user;
Voice user's number of the actual connection in described voice user's statistical form is subtracted 1.
8. the device of transmission network voice in WLAN (wireless local area network) is characterized in that, this device comprises:
The scheduling setting device, be used for the voice signal frame is set different scheduling modes with data frame signal, and utilize centralized control agreement polling dispatching speech frame in contention free period, utilize distributed csma/collision avoidance protocol data dispatching frame in the competition phase;
Judgment means is used for determining according to the bandwidth that sends time that terminal encodes to voice and AP the polling cycle of described polling dispatching speech frame, and obtains the voice user's that access points allows maximum number according to polling cycle;
Communicate to connect apparatus for establishing, be used for the transmission that the voice user's that allows according to the described Network Access Point that obtains maximum number is set up voice-over-net.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310121787 CN1286299C (en) | 2003-12-24 | 2003-12-24 | Method and device for transmitting network sound in radio local area network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310121787 CN1286299C (en) | 2003-12-24 | 2003-12-24 | Method and device for transmitting network sound in radio local area network |
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| CN100527705C (en) * | 2006-02-10 | 2009-08-12 | 北京大学 | WLAN VoIP transfer method based on the unicast |
| CN101026545B (en) * | 2006-02-21 | 2010-05-12 | 联想(北京)有限公司 | Real-time multimedia transmitting system and method |
| CN101483926B (en) * | 2009-02-18 | 2011-09-07 | 杭州华三通信技术有限公司 | Channel evaluation method and apparatus |
| CN104469960B (en) | 2013-09-25 | 2019-12-10 | 中兴通讯股份有限公司 | scheduling configuration method and device |
| US9363736B2 (en) * | 2013-12-16 | 2016-06-07 | Qualcomm Incorporated | Methods and apparatus for provisioning of credentials in network deployments |
| CN108777716A (en) * | 2018-06-08 | 2018-11-09 | 北京飞音时代技术有限公司 | IP telephone machine dispositions method |
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