CN101925192A - Signal channel access method - Google Patents
Signal channel access method Download PDFInfo
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- CN101925192A CN101925192A CN201010237636XA CN201010237636A CN101925192A CN 101925192 A CN101925192 A CN 101925192A CN 201010237636X A CN201010237636X A CN 201010237636XA CN 201010237636 A CN201010237636 A CN 201010237636A CN 101925192 A CN101925192 A CN 101925192A
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Abstract
The invention discloses a signal channel access method. The method comprises the following steps: judging whether voice information or data information needs to be sent by a sending node, sending the data information and releasing a signal channel after the sending is finished if the information is a data information frame, sending the voice information carrying reservation information if the information is the voice information, using a receiving node to receive the voice information and updating a network distribution vector according to the reservation information. The adoption of the signal channel access method can ensure the real-time property and the jitter performance of voice service and realize the voice service under the multi-hop situation by reserving a sending frame for the follow-up voice information according to the reservation information.
Description
Technical field
The present invention relates to wireless communication technology, particularly relate to a kind of channel access method.
Background technology
The physical layer of 802.11 pairs of WLAN (wireless local area network) of present institute of electrical and electronic engineers (IEEE) standard (Std) and media interviews controls (MAC) layer have carried out standard.The basic channel access method of the MAC of IEEE Std802.11 adopts distributed coordination function (DCF), is called the carrier sense multiple access (CSMA/CA) that the band collision is avoided.
In the channel access method under DCF mechanism, the node that need send should be intercepted medium, sends with the node that determines whether other, if there is not other node to send, determines that then medium are not in a hurry, and then this node can send.Existing carrier sense mechanism is finished jointly by physical carrier and virtual carrier sensing in wireless network communication.Wherein, physical carrier is intercepted the situation that takies of determining channel by the signal on the channel around the node reception; Virtual carrier sensing in wireless network communication then is to judge on the basis that the information that receives is analyzed how long channel with the occupied time, need postpone with the transmission of determining self.Each node in the network all will be safeguarded a network allocation vector (NAV), indicates the time that ongoing transmission is required.Carrier sense function physics and virtual is used for determining the state of channel.As long as wherein indicating channels are busy, then channel just is considered to busy, otherwise channel is considered to idle.Carrier sense mechanism combines the NAV state and the transmitter status of the node that uses physical carrier to intercept to determine the busy-idle condition of channel.NAV can be counted as a counter, down count down to 0 with uniform rate.When counter was 0, virtual carrier sensing in wireless network communication was designated as the channel spare time; Otherwise, be designated as busy.As long as node sends, channel just is confirmed as hurrying.If channel is for busy, then node will be postponed transmission, and will be idle always in a period of time up to medium.Physical carrier is intercepted mechanism and should be provided by physics (PHY) layer.Virtual carrier sense mechanism is provided by the MAC layer, announces that by the distribution subscription information medium are with the time that is used.Existing mac frame form as shown in Figure 1.Referring to Fig. 1, mac frame comprises a duration/identify label (Duration/ID) field, is used to define channel with the time cycle that is retained, and for data service, this time cycle is in order to send actual data frame and to return response (ACK) frame.All nodes that are in source node or the destination node range of receiving will learn that all channel is preengage.Receive the information of the Duration/ID field that the node utilization of valid frame receives, when new NAV value greater than current NAV value, and this frame receives the NAV of the node updates oneself of valid frame when not being addressed to this recipient's node.
According to the channel access method of above-mentioned DCF mechanism, under multiple jump condition,, therefore can't guarantee the time delay and the jitter performance of voice service because each frame all adopts CSMA/CA mechanism.That is to say, the channel access method of the DCF mechanism of IEEE Std 802.11 regulations is not suitable for transmitting to time delay and the strict voice service of shake index request, though it can well support non-real time service, can not guarantee the time delay of real-time service and shake.In a word, the channel access method of existing DCF mechanism can't be supported the voice service under the multiple jump condition.
Summary of the invention
The invention provides a kind of channel access method, adopt this method can realize voice service under the multiple jump condition.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of channel access method, comprising:
Judge that sending node need send speech information or data message;
If data information frame then sends described data message, sending end back release channel;
If speech information then sends speech information, in described speech information, carry subscription information; Receiving node receives described speech information, upgrades network allocation vector NAV according to described subscription information.
In said method, before the described transmission speech information, this method further comprises:
Carry out channel and intercept, judge whether channel is idle;
If not, then return and carry out channel and intercept, judge the step that channel is whether idle;
If, then proceed time span and be the channel of interFrameGap IFS and intercept, judge whether channel is idle;
If not, then return and carry out channel and intercept, judge the step that channel is whether idle;
If then carry out the step that sends speech information.
In said method, described transmission speech information comprises:
According to back off algorithm speech information is kept out of the way operation;
Insert the concurrent speech information of sending to after row is kept out of the way operation to channel.
In said method, the IFS of Speech frame that carries described speech information is less than the IFS of Frame of the described data message of carrying.
In said method, describedly in described speech information, carry subscription information, comprising:
In the media interviews control mac frame head of the Speech frame that carries described speech information, carry subscription information.
In said method, described mac frame head comprises: the frame control domain;
Described frame control domain specifically comprises: type field and subtype territory are used to represent the type of this frame.
In said method, described type thresholding be 11 and the subtype thresholding be 0001 to be used to represent that this frame type is a Speech frame.
In said method, described subscription information comprises:
Zero-time is used to be provided with the initial transmitting time of next Speech frame;
Duration, be used to be provided with time of next Speech frame busy channel;
Described mac frame head comprises:
The zero-time field is used to carry zero-time;
The duration field is used to carry the duration.
In said method, described according to described subscription information renewal NAV, comprising:
The subscription time section that subscription information relates to is set to hurry.
In said method, described according to after the described subscription information renewal NAV, this method further comprises:
If receiving node need send information, judge whether the time of reception of current voice information and the free time between the zero-time can finish the frame exchange process, if the information of carrying out sends, otherwise the information of not carrying out sends.
By above summary of the invention as seen, in the channel access method of the embodiment of the invention, for speech information, in the speech information that sends, carry subscription information, after receiving node receives speech information, upgrade NAV according to this subscription information, therefore reserved transmit frame according to subscription information for subsequent voice information, be equivalent to exist one to be fixedly coupled, thereby guaranteed reliably taking of channel resource, guaranteed the real-time and the jitter performance of voice service.For data information frame, then send described data message, sending end back release channel, therefore can carry out the plug hole transmission to data message in the gap of transporting speech information.
Description of drawings
Fig. 1 is a mac frame format structure schematic diagram of the prior art;
Fig. 2 is the schematic flow sheet of the channel access method of the embodiment of the invention;
Fig. 3 is the mac frame format structure schematic diagram in the channel access method of the embodiment of the invention;
Fig. 4 is the structural representation of the frame control domain of the mac frame in the channel access method of the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Basic thought of the present invention is, carries subscription information in speech information, is used to preengage the shared time of next speech information, thereby realizes the voice service under the multiple jump condition.
The channel access method of the embodiment of the invention may further comprise the steps at least:
Judge that sending node need send speech information or data message.
If data information frame then sends described data message, sending end back release channel.Owing to discharge channel after sending data message, therefore next data message needs competitive channel again when inserting.
If speech information then sends speech information, in described speech information, carry subscription information, receiving node receives described speech information, upgrades NAV according to described subscription information.For voice service, first frame of voice-over information adopts CSMA/CA mode access channel, by first frame next frame is carried out channel booking.In speech information, carry subscription information, therefore can guarantee that the same time slot in the next information is used for voice-over information, thereby guarantee the real-time and the jitter performance of speech business.
This shows that in the channel access method that the present invention proposes, speech information adopts the reservation access way, data message adopts the plug hole technology to insert, therefore technical ability is supported transfer of data, can guarantee the maximum delay of voice service again, thereby reach ideal system capacity and service quality.On this basis, speech information can also adopt the access way of carrier sense simultaneously, further reduces the load conflict probability in the network.Below by a specific embodiment channel access method of the present invention is elaborated.Fig. 2 is the schematic flow sheet of the channel access method of the embodiment of the invention.As shown in Figure 2, this method may further comprise the steps.
Step 201: judge that sending node need send speech information or data message, if data message, then execution in step 202; If speech information, then execution in step 203.
Step 202: send described data message, sending end back release channel.In this step, can adopt existing channel access method, for example finish according to the regulation of IEEE Std 802.11 to the transmission of data message.
Step 203: carry out channel and intercept, judge whether channel is idle.If not, then return step 203, proceed channel and intercept, judge whether channel is idle; If, execution in step 204.
Step 204: the channel of proceeding time span and be interFrameGap (IFS) is intercepted, and judges whether channel is idle.If not, then return step 203, proceed channel and intercept, judge whether channel is idle; If then execution in step 205.In this step, therefore the IFS of Speech frame that carries described speech information can guarantee that voice service is better than the data service access channel less than the IFS of Frame of the described data message of carrying.
Step 205: send speech information, in speech information, carry subscription information.In this step, can also before sending speech information, keep out of the way operation, be specially: speech information is kept out of the way operation according to back off algorithm; Insert the concurrent speech information of sending to after row is kept out of the way operation to channel.The embodiment of the invention does not limit the concrete grammar of back off algorithm, and any back off algorithm is all applicable.
In step 204, to intercepting idle situation with channel, still continuing to carry out a time span channel that is IFS intercepts, in IFS under the still idle situation just access channel send, and in step 205, speech information is handled afterwards just access channel through back off algorithm, therefore, reduced the probability that clashes when offered load is very heavy.
And, improve by Speech frame voice-over information, be implemented in and carry subscription information in the speech information.Particularly, carry subscription information in the mac frame head of the Speech frame that carries described speech information, this subscription information comprises: the duration of the zero-time of next Speech frame and next Speech frame busy channel.In embodiments of the present invention, the structure of Speech frame of the prior art is improved, especially the mac frame head for Speech frame improves.Fig. 3 is the mac frame format structure schematic diagram in the channel access method of the embodiment of the invention.As shown in Figure 3, comprise at least in the mac frame head in the channel access method of the embodiment of the invention: zero-time field and duration field.The zero-time field length is 16 bits, is used to carry zero-time, and the value of zero-time field is the initial transmitting time of next Speech frame.The duration field length is 1 bit, is used to carry the duration, and the value of duration field is the time of the busy channel of next Speech frame.Therefore, zero-time field and duration field have determined that a Speech frame needs the time of busy channel, therefore, and for sending next Speech frame, according to channel reservation time time of above-mentioned needs busy channel.In the mac frame form of the embodiment of the invention, zero-time field and duration field can by in the mac frame form of prior art the duration/the identify label field divides and to form.
Also comprise in the mac frame head in the channel access method of the embodiment of the invention: the frame control domain.Compared with prior art, the embodiment of the invention is also improved the frame control domain.Fig. 4 is the structural representation of the frame control domain of the mac frame in the channel access method of the embodiment of the invention.As shown in Figure 4, the frame control domain comprises at least: type field and subtype territory all are used to represent the type of this frame.In existing mac frame header structure, types value 11 and subtype value 0000-1111 are retention.In the present embodiment, with the type thresholding be 11 and the subtype thresholding be 0001 to represent the Speech frame type.
Step 206: receiving node receives described speech information, upgrades NAV according to described subscription information.Concrete update method is: the subscription time section that subscription information relates among the NAV of self is set to hurry.After then having carried out above-mentioned renewal, in the subscription time section that subscription information relates to, can not send any information again.
Step 207: if receiving node need send information, judge whether the time of reception of current voice information and the free time between the zero-time can finish the frame exchange process, if the information of carrying out sends, otherwise the information of not carrying out sends.
And for the voice service of multi-hop, when surpassing some jumpings or real-time and can not guarantee, via node abandons Speech frame, and, after abandoning Speech frame, return to origin node and to abandon reason, perhaps, do not return and abandon reason, abandon voice service when origin node judgement calling is obstructed to origin node.
By above embodiment as seen, no matter the Speech frame for voice-over information still is the Frame of carry data information, begins most still to adopt existing channel access method to come competitive channel.Different is, speech information or data message are judged, if the speech information competition obtains channel, then each grouping information all will be preengage channel thereafter, concerning the channel of each jumping, its time of being preengage is to rise in the moment that next speech information sends, through the time of Speech frame transmitting time, Speech frame interbody spacer, next jumping via node forwarding.
And, because the IFS of speech information is less than the IFS of data message, therefore the speech information priority of seizing channel is higher than data message, like this for speech business, as long as begin most to rob account for channel after, during whole conversation, be equivalent to exist one to be fixedly coupled, thereby guaranteed reliably taking of channel resource, guaranteed the real-time and the jitter performance of voice service.
And, because Speech frame is very short and big or small fixing, for not having busy channel always between two nodes on this path, but there is a lot of spaces, if other node has out of Memory to need to send, can be according to the principle of frame type and corresponding access channel, judging whether can the plug hole transmission.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a channel access method is characterized in that, comprising:
Judge that sending node need send speech information or data message;
If data information frame then sends described data message, sending end back release channel;
If speech information then sends speech information, in described speech information, carry subscription information; Receiving node receives described speech information, upgrades network allocation vector NAV according to described subscription information.
2. method according to claim 1 is characterized in that, before the described transmission speech information, this method further comprises:
Carry out channel and intercept, judge whether channel is idle;
If not, then return and carry out channel and intercept, judge the step that channel is whether idle;
If, then proceed time span and be the channel of interFrameGap IFS and intercept, judge whether channel is idle;
If not, then return and carry out channel and intercept, judge the step that channel is whether idle;
If then carry out the step that sends speech information.
3. method according to claim 1 and 2 is characterized in that, described transmission speech information comprises:
According to back off algorithm speech information is kept out of the way operation;
Insert the concurrent speech information of sending to after row is kept out of the way operation to channel.
4. method according to claim 1 and 2 is characterized in that,
The IFS of Speech frame that carries described speech information is less than the IFS of Frame of the described data message of carrying.
5. method according to claim 1 and 2 is characterized in that, describedly carries subscription information in described speech information, comprising:
In the media interviews control mac frame head of the Speech frame that carries described speech information, carry subscription information.
6. method according to claim 5 is characterized in that,
Described mac frame head comprises: the frame control domain;
Described frame control domain specifically comprises: type field and subtype territory are used to represent the type of this frame.
7. method according to claim 6 is characterized in that,
Described type thresholding be 11 and the subtype thresholding be 0001 to be used to represent that this frame type is a Speech frame.
8. method according to claim 5 is characterized in that,
Described subscription information comprises:
Zero-time is used to be provided with the initial transmitting time of next Speech frame;
Duration, be used to be provided with time of next Speech frame busy channel;
Described mac frame head comprises:
The zero-time field is used to carry zero-time;
The duration field is used to carry the duration.
9. method according to claim 1 is characterized in that, and is described according to described subscription information renewal NAV, comprising:
The subscription time section that subscription information relates to is set to hurry.
10. method according to claim 8 is characterized in that, described according to after the described subscription information renewal NAV, this method further comprises:
If receiving node need send information, judge whether the time of reception of current voice information and the free time between the zero-time can finish the frame exchange process, if the information of carrying out sends, otherwise the information of not carrying out sends.
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| CN 201010237636 CN101925192B (en) | 2010-07-27 | 2010-07-27 | Signal channel access method |
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| CN 201010237636 CN101925192B (en) | 2010-07-27 | 2010-07-27 | Signal channel access method |
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| CN103152836A (en) * | 2013-01-23 | 2013-06-12 | 洛阳乾禾仪器有限公司 | Communication method for common-frequency multi-terminal wireless communication network |
| CN103840908A (en) * | 2012-11-22 | 2014-06-04 | 华为终端有限公司 | Indication information sending method, and data sending method and device |
| CN104363657A (en) * | 2014-11-06 | 2015-02-18 | 东莞宇龙通信科技有限公司 | Device with base station function and method and system for data transmission |
| CN105337705A (en) * | 2014-08-06 | 2016-02-17 | 中兴通讯股份有限公司 | Data transmission feedback, data transmission method and device |
| CN107231698A (en) * | 2016-03-25 | 2017-10-03 | 展讯通信（上海）有限公司 | The transmission method of data, terminal and base station in wireless cellular network |
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Cited By (10)
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| CN103840908A (en) * | 2012-11-22 | 2014-06-04 | 华为终端有限公司 | Indication information sending method, and data sending method and device |
| CN103840908B (en) * | 2012-11-22 | 2017-11-21 | 华为终端（东莞）有限公司 | Configured information sending method, data transmission method for uplink and equipment |
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| CN105337705B (en) * | 2014-08-06 | 2020-06-23 | 中兴通讯股份有限公司 | Data transmission feedback, data transmission method and device |
| CN104363657A (en) * | 2014-11-06 | 2015-02-18 | 东莞宇龙通信科技有限公司 | Device with base station function and method and system for data transmission |
| CN104363657B (en) * | 2014-11-06 | 2019-10-11 | 东莞宇龙通信科技有限公司 | Data transmission method, system and the equipment with base station functions |
| CN107231698A (en) * | 2016-03-25 | 2017-10-03 | 展讯通信（上海）有限公司 | The transmission method of data, terminal and base station in wireless cellular network |
| CN107231698B (en) * | 2016-03-25 | 2020-04-07 | 展讯通信（上海）有限公司 | Data transmission method, terminal and base station in wireless cellular network |
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