201146065 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種無線媒介存取控制（MAC)方法，尤 指一種提高通道重載傳輸效率之載波檢測多路存取/碰撞避 免協定的延後競爭退讓方法。 【先前技術】 無線區域網路係指不使用實體線路所構成的區域網 路’目前大部分的無線區域網路技術係使用無線電波為傳 輸媒介而構成一個無線通訊網路。 請參閱圖1所示，係為一無線區域網路系統的系統架 構圖’其主要由至少一無線存取點（AP) 1 0以及至少一行動 站台（MS )20所構成，其中行動站台概如個人數位助理 (PDA)、筆記型電腦等。於無線區域網路系統中，無線存 取點與各行動站台係利用無線通道加以連結以進行通訊， 至於連線方式則如參考文獻[1]([1] : IEEE Standard for Information technology-Tele communications and information exchange between sy stems-Loca I and metropolitan area networks-Specific requirements-“Part 11 ： Wireless LAN Medium Access Control (MAC) and201146065 VI. Description of the Invention: [Technical Field] The present invention relates to a wireless medium access control (MAC) method, and more particularly to a carrier detection multiple access/collision avoidance protocol for improving channel heavy-duty transmission efficiency Post-competition concession method. [Prior Art] Wireless local area network refers to a regional network that does not use physical lines. Most of the current wireless local area network technologies use radio waves as a transmission medium to form a wireless communication network. Referring to FIG. 1, a system architecture diagram of a wireless local area network system is mainly composed of at least one wireless access point (AP) 10 and at least one mobile station (MS) 20, wherein the mobile station platform Such as personal digital assistant (PDA), notebook computer, etc. In a wireless local area network system, a wireless access point and each mobile station station are connected by a wireless channel for communication, and the connection method is as reference [1] ([1]: IEEE Standard for Information technology-Tele communications And information exchange between sy stems-Loca I and metropolitan area networks-Specific requirements-"Part 11 : Wireless LAN Medium Access Control (MAC) and
Physical Layer (PHY) Specifications，，，2007·)加以制定。 在丨EEE所疋義的802.11無線區域網路標準下，其制定之 規範能夠使彳于無線存取點與各行動站台互相聯繫、溝通， 並快速地交換資料、數據、檔案與影音訊息。 以下進一步說明，於無線區域網路系統中複數行動站[门 4 201146065 無線通訊裝置已開始發送訊框Physical Layer (PHY) Specifications,,,2007·) was developed. Under the 802.11 wireless local area network standard defined by EEE, its specifications enable wireless access points to communicate with each mobile station, communicate, and quickly exchange data, data, files and audio and video information. The following further explains that multiple mobile stations in the wireless local area network system [gate 4 201146065 wireless communication device has begun to send frames
台20相互進行資料傳送的方式。由於各行動站台2〇都是 經由一無線媒體來傳送資料，故各個網路成員間勢必要遵 守相同協定以協調各個網路成員對此媒體的存取。一俨 IEEE802.11無線區域網路標準下的無線網路在媒體存取 控制（MAC)所使用的存取模式為分散式協調功能（DcF)， 於分散式協調功能下各個行動站台20會根據一载波檢測 多路存取/碰撞避免（CSMA/CA)協定來存取該無線媒體。當 -行動站台2QA發送資料前會先㈣目前該無線媒體是: 鲁間置（ldle)，意即先偵測是否已經有其他行動站台2〇使用 該無線媒體傳送資料，若該無線媒體為間置狀態，則該行 動站台20A係隨機選定一退讓（back〇ff)時間開始進行倒數 計時並持續偵測無線媒體，於該退讓時間倒數結束時，若 該無線媒體仍然閒置，代表該行動站台2〇A有權存取該無 線媒體’故可開始發出其訊框（frame)。反之，若該行動站 台20A在倒數結束之前該無線媒體已被佔用意即有其他 始發送訊框，則該行動站台20A就會陳 〇A再次偵測到該無線媒 以持續爭取該無線媒體的存取權。The way in which the stations 20 perform data transmission with each other. Since each mobile station transmits data via a wireless medium, it is necessary for each network member to comply with the same agreement to coordinate the access of each network member to the media. As for the wireless network under the IEEE802.11 wireless local area network standard, the access mode used by the media access control (MAC) is the distributed coordination function (DcF). Under the distributed coordination function, each mobile station 20 will be based on A carrier detect multiple access/collision avoidance (CSMA/CA) protocol is used to access the wireless medium. When the mobile station 2QA sends the data, it will first (4) The current wireless media is: ldle, which means to detect whether there are other mobile stations 2 to use the wireless media to transmit data, if the wireless media is When the state is set, the mobile station 20A randomly selects a backoff time to start counting down and continuously detects the wireless medium. When the back time of the back time is over, if the wireless medium is still idle, it represents the mobile station 2 〇A has access to the wireless medium' so it can start to send its frame. On the other hand, if the mobile station 20A has been occupied by the wireless medium before the end of the countdown, that is, there is another initial transmission frame, the mobile station 20A will detect the wireless medium again to continuously strive for the wireless medium. Access rights.
就會再度開始進行退讓 9及圖10所示’以下進一步說明义 佚線區域網路標準採用之分散式協調功 讓方法（BEB)，其包含下列步驟： 準備傳送資料2 〇 1 .The retreat will begin again 9 and as shown in Figure 10. The following is a further description of the Decentralized Coordination Function (BEB) method used by the Relying Area Network Standard, which includes the following steps: Preparing to transmit data 2 〇 1 .
201146065 選取一退讓時間B2nq 1 B203’係令一無線通訊裝置於[0,CW-11 區間之中根據均勻分右昧 1 士 布1^機選取B’其中該無線通訊裝置 可為該無線存取點i P( + 1 1〇或前述的行動站台20 ; 倒數B204，今兮&2 4無線通訊裝置於閒置經過一時槽 (slot，即無線網路 u讓單位）時，減少一單位的B ; 開始傳送資料 、 ’々該無線通訊裝置於Β減至愛單 位時後即開始傳送該筆資料； 判斷資料是否值1 运成功206，令該無線通訊裝置判斷 此筆資料是否彳塞# + i . 傳达成1力’若成功則結束資料傳送207並回 到準備傳送資料步驟9 貝計步驟2Q1以傳送下—筆資料，若失敗則進 仃下一步驟； ^判斷失敗-人數疋否超過—預定重傳次數r⑽若失敗 -人數超過R則丟棄該筆資料2〇9 ’並重新執行 料步驟201以進行下—黎次上丨λ沾 筆貝料的傳送，若失敗次數尚未超 過R則進行下一步驟； 判斷⑽是否等於一最大競爭視窗參數CWmaX21〇 ’ :CW等於瞻略則回到前述的選取退讓時間步驟203, 若CW不等於CWmax則執行下一步驟；以及 CW倍增211，將cw之值倍增後_前述 讓時間步驟203。 根據C S MA/CA十在宁，、p η* B曰aa上 協疋退讓時間的決定會影響整個無 ㈣路的效能，如大，則選到長的退讓時間之機率 阿’發生碰撞的機率降低’但無線通道卻會有太多閒置的 時候而導致其通道使用率降低；反之，如I cw小，則選 201146065 到短的退讓時間之機率高，發生碰撞的機率會增加，重傳 的次數增加’因封包有傳送次數的限制，故封包遺失率會 提高’因而使通道的有效使用率下降。此外，沒有遭遇碰 撞的封包可快速送出，但遭遇碰撞的封包重送時需重新倒 數’且倒數的時間通常比前次傳送長，封包延遲相當大， 使封包傳送時有延遲變異量大的問題。此外，若一用戶每 次傳遞封包時都無碰撞發生，但另一用戶每次傳遞都遭遇 碰知’則沒有遭遇碰撞的用戶所能使用的頻寬相對大於每 次都遭遇碰撞的用戶，因此有頻寬分配不公的問題。 【發明内容】 為解决一元指數退讓方法（BEB)通道使用率低、封包 延遲變異量大以及頻寬分配公平性不足的問題’本發明提 t種月夠改進現有缺失之提高通道重載傳輸效率之載波 檢測多路存取/碰撞避免協定的延後競爭退讓方法，除了可 以增加通道使用率、降低封包碰撞率及降低封包遺失率外， 還具有訊務整型的功能，沾i 力 月匕降低封包的抖動（jitter)，此外， 還可提升網路資源分配的公 題 平丨 減〉、頻寬分配不均的問 本發明所運用的技術手 ..,,α 又係在於鈥供一種能夠改進現 有缺失之提咼通道重載傳輸效 半之載波双測多路存取/琉j 避免協定的延後競爭退讓 夕峪仔取/則里 疋遢方法，其包含下列步驟： 準備傳送資料； 設定競爭視窗參數初始值， 為一最小競爭視窗參數； 岭視由參數CW設 201146065 選取退讓時間，於[0,CW-1】區間之中根據均4 機選取一退讓時間； β 判斷該資料是否為第一次傳送，若是則將該 Λ k讓時問 延長一額外的後退時間並執行下一步驟，若該資料 一次傳送則執行下一步驟； 疋第 執行退讓程序，並於退讓程序結束後執行下— 以及 —步驟； 步驟 執行傳送程序，並於結束後回到前述的準 。 卞顶俜送資料 前述的退讓程序係包含下列步驟： 判斷通道是否忙碌，於經過一時槽後若判斷通 則凍結倒數時間，反之，則減少一單位的退讓時間.以“ 判斷退讓時間是否等於零，若是則執行傳送裎’序从，及+ 否則回到前述的判斷通道是否忙碌步驟。 右 前述的傳送程序係包含下列步驟： 開始傳送資料； 判=資料是否傳送成功，若傳送成功則結束資 並回到前述的準備傳送資料步驟，若傳送失+ k 失敗次數後進行下一步驟； 則累加一次 判斷失敗:欠數是否超過—預定重傳次數， 定重傳次數❹棄該筆資料，並回到前述 傳= 步驟’若尚未超過該預定重傳次數則執行下—步：;送貝料 判斷CW是否等於一最大競爭 w 該最大競爭視窗參數，則回到前述的選=㈣專於 驟，若CW不等& j f ρ # u讓時間之步 寺於6亥最大競爭硯窗參數則執行下—步驟； 201146065 以及 將cw倍增，並回到前述的隨機選取退讓時間之步驟。 前述的後退時間係為一常數。 前述的後退時間係與無線通訊裝置數目成正比關係。 本發明利用戶斤提供的提高通道重載傳冑效率之載波檢 測多路存取/碰撞避免協定的延後競爭退讓方法，可以獲= 的具體效益為： # 1·本發明讓第一次傳送的封包多等一額外的後 間，能夠有效降低高負載網路之封包的碰撞率以及封 遺失率可提供無線區域網路更高的通道使用率，：線 網路壅塞的問題。 壤 t不贫明讓首次傳送 W。/寸 哪〜、的便退時間 相對來說就是給傳送失敗的封包較高的優U，有效降 封包延遲的變異量，提供訊務整型的功效。201146065 Select a back-off time B2nq 1 B203' is a wireless communication device in the [0, CW-11 interval according to the uniform split right 1 士布11 machine select B' where the wireless communication device can be the wireless access Point i P ( + 1 1〇 or the aforementioned mobile station 20; countdown B204, this time & 2 4 wireless communication device is reduced by one unit of time (slot, that is, wireless network u let the unit), reduce one unit of B ; Start transmitting data, '々 The wireless communication device starts transmitting the data when it is reduced to the love unit; determines whether the data value is 1 or not, so that the wireless communication device determines whether the data is blocked # + i If it is successful, end the data transfer 207 and return to the ready to transfer data. Step 9 Step 2Q1 to transfer the next-pen data. If it fails, proceed to the next step; ^Failed to judge - the number of people exceeds - If the number of scheduled retransmissions r(10) fails - the number of people exceeds R, the data is discarded 2〇9' and the material step 201 is re-executed to carry out the transmission of the lower-Lie 丨 丨 沾 沾 贝 贝 , , , , , , , , , , , , , , , , , , , , , Next step; judgment (10) No equal to a maximum contention window parameter CWmaX21〇': CW is equal to the preview to return to the aforementioned selection of the retreat time step 203, if the CW is not equal to CWmax then the next step; and CW multiplication 211, the value of cw is multiplied _ the aforementioned Let time step 203. According to CS MA/CA ten in Ning, p η * B曰aa on the decision of the concession time will affect the performance of the entire (four) way, such as large, then choose the probability of long return time 'The probability of collision is reduced', but the wireless channel will have too much idle time, resulting in a decrease in channel usage. Conversely, if I cw is small, the probability of selecting 201146065 to a short return time is high, and the probability of collision will occur. Increase, the number of retransmissions increases 'Because the packet has a limit on the number of transmissions, the packet loss rate will increase', thus reducing the effective usage rate of the channel. In addition, packets that do not encounter collisions can be quickly sent out, but packets that encounter collisions are resent. When you need to re-rewind 'and the countdown time is usually longer than the previous transmission, the packet delay is quite large, so that there is a problem of large delay variation when the packet is transmitted. In addition, if a user is No collision occurs when the packet is transmitted, but another user encounters the collision every time. The user who has not encountered the collision can use a bandwidth larger than the user who encounters the collision every time, so there is a problem of unfair bandwidth allocation. [Summary of the Invention] In order to solve the problem of low usage rate of the unary index return method (BEB), large variation of packet delay variation, and insufficient fairness of bandwidth allocation, the present invention can improve the existing channel to improve the channel overload transmission. The carrier-detection multi-access/collision avoidance protocol of the efficiency is designed to increase the channel usage rate, reduce the packet collision rate, and reduce the packet loss rate. It also has the function of traffic shaping.匕Reducing the jitter of the packet, in addition, it can also improve the problem of the network resource allocation, and the uneven distribution of the bandwidth. The technical hand used by the present invention is. A carrier double-measurement multiple access that can improve the existing missing channel and heavy-duty transmission efficiency. 避免j Avoid the delayed postponement of the agreement and retreat to the future. The method comprises the following steps: preparing to transmit data; setting an initial value of the competition window parameter as a minimum contention window parameter; and selecting a backoff time from the parameter CW setting 201146065, in the interval [0, CW-1] according to the average 4 The machine selects a back-off time; β determines whether the data is the first transmission, and if so, extends the time to extend an additional back-off time and performs the next step, and if the data is transmitted once, the next step is performed; The first execution of the retreat program, and after the end of the retreat program - the next - and - steps; the step to execute the transfer program, and after the end returns to the above criteria.前述 俜 资料 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 前述 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退 退Then execute the transfer 序 'order slave, and + otherwise return to the aforementioned judgment channel is busy step. The above-mentioned transfer program includes the following steps: start transmitting data; judge = whether the data is successfully transmitted, if the transfer is successful, the capital is returned To the foregoing step of preparing to transmit data, if the number of failures of the transmission + k is lost, the next step is performed; then, the judgment fails: the number of failures exceeds the number of predetermined retransmissions, the number of retransmissions is discarded, and the data is discarded. The foregoing pass = step 'if the predetermined number of retransmissions has not been exceeded, the next step is performed:; if the feed material is judged whether the CW is equal to a maximum competition w, the maximum competition window parameter, then return to the foregoing selection = (4) specialization, if CW does not equal & jf ρ # u let time step temple in 6 Hai maximum competition window parameters then perform the next step; 201146065 and will cw times Increase and return to the aforementioned step of randomly selecting the backoff time. The aforementioned backoff time is a constant. The aforementioned backoff time is proportional to the number of wireless communication devices. The invention provides a channel for heavy load transmission provided by the user. The efficiency of the carrier detection multi-access/collision avoidance agreement for the delayed competition concession method, the specific benefits that can be obtained =: 1. The invention allows the first transmission of the packet to wait for an additional post-time, which can effectively reduce The collision rate and the loss rate of the packet of the high-load network can provide a higher channel utilization rate of the wireless local area network: the problem of the network network congestion. The soil t is not poor, let the first transmission W. / inch ~ The retreat time is relatively high for the packet that fails to transmit, effectively reduces the variation of the packet delay, and provides the effect of traffic shaping.
3.本發明讓首次傳送的封包多等—額外的後退時 壤則次傳送失敗的封包有較少的競爭者，提 的機率，藉此提高網路資源使用上的公平性，避二成 頻寬被傳送成功機率高的使用者—直佔用。 【實施方式】 為能詳細瞭解本發明的技術特徵及 照說明書的内容來實施，茲進一+ 效，並可依 施例，詳細說明如后： 圖式所示的較佳實 本發明所提供的提 路存取/碰撞避免協定的 高通道重載傳輪 延後競爭退讓方 效率之載波檢測多 法係如圖1至圖8 201146065 所示。如圖1所示，一無線區域網路的無線通訊裝置共包 含有一無線存取點（AP)1〇以及至少一行動站台20，無線通 訊裝置數目係為N。 以下係詳述本發明之提高通道重載傳輸效率之載波檢 測多路存取/碰撞避免協定的延後競爭退讓方法，請配合參 考圖2及圖3所示，包含下列步驟： 準備傳送資料101 ; 設定競爭視窗參數初始值1 02，將一競爭視窗參數CW _ 設為一最小競爭視窗參數CWmin ; 選取一退讓時間B103’係令一無線通訊裝置於[〇,cw-1] 區間之中根據均勻分布隨機選取B，其中該無線通訊裝置 可為該無線存取點1 〇或前述的行動站台20 ; 判斷資料是否為第一次傳送1 04，若是第一次傳送則 將 A ? ΐ ε ^長—額外的固定長度後退時間C成為新的Β 1 05後 亍下步驟’若該資料不是第一次傳送則執行下一步驟； φ 判斷通道是否忙碌1 06，於經過一時槽後若判斷通道 忙碌則凍結倒數時間1〇7，反之，則減少一單位的βι〇8 ; 斷Β疋否等於零109，若是則執行下一步驟，若否 回到則述的判斷通道是否忙綠步驟1 〇6 ; 開始傳送資料]1〇，令該無線通訊裝置於Β減至零單 B’後即開始傳送該筆資料； 傳送1斷資料是否傳送成功111，若傳送成功則結束資料 加-：/生2纟回到準備傳送資料步驟101，若傳送失敗則累 人失敗次數後進行下一步驟； 列斷失敗次數是否超過-預定重傳次數R113，若失敗 201146065 次數超過R則I睾#签杳4立 案。玄筆貝枓1 1 4，並回到前述的準備傳送 資料步驟1 01，若类杜+齡A a ^ 、 右夭敗-人數尚未超過R則進行下一步驟； 判斷CW是否耸# «L , ^ ^ 疋企寺於一最大競爭視窗參數CWmax115,若 若CW不等 CW等於Cwmax，貝，丨回到前述的選取B步驟1〇3 於CWmax則執行下一步驟；以及 化乓11 6 ,將CW之值倍增後回到前述的選取B 步驟103。3. The present invention allows for the first transmission of packets to be multi-equivalent - the extra retreat time is less than the competitors, the probability of mentioning, thereby improving the fairness of the use of network resources, avoiding the frequency of the second generation The user whose width is transmitted successfully has a high probability of being occupied. [Embodiment] In order to enable a detailed understanding of the technical features of the present invention and the contents of the specification, the present invention can be implemented in detail, and can be described in detail by way of example: the preferred embodiment of the present invention provides The carrier detection multi-method of the high-channel heavy-duty transmission delaying competition and the yield-returning side efficiency of the approach access/collision avoidance agreement is shown in Fig. 1 to Fig. 8 201146065. As shown in FIG. 1, a wireless area network wireless communication device includes a wireless access point (AP) 1 and at least one mobile station 20, and the number of wireless communication devices is N. The following is a detailed description of the method for delaying the competition of the carrier detection multiple access/collision avoidance protocol for improving the channel heavy-duty transmission efficiency of the present invention. Please refer to FIG. 2 and FIG. 3, including the following steps: Preparing to transmit data 101 Setting the competition window parameter initial value 1 02, setting a competition window parameter CW _ to a minimum contention window parameter CWmin; selecting a retreat time B103' to cause a wireless communication device to be in the [〇, cw-1] interval according to Uniformly randomly selecting B, wherein the wireless communication device can be the wireless access point 1 or the aforementioned mobile station 20; determining whether the data is transmitted for the first time 104, and if it is the first transmission, A? ΐ ε ^ Long—additional fixed length back time C becomes new Β 1 05 After step ' 'If the data is not the first transmission, the next step is performed; φ determines whether the channel is busy 1 06, if the channel is judged after one time slot When busy, freeze the countdown time 1〇7, otherwise, decrease the unit of βι〇8; if the break is equal to zero 109, if yes, execute the next step, if not, then judge whether the channel is busy or not. 1 〇6 ; Start transmitting data]1〇, so that the wireless communication device starts transmitting the data after decrementing to zero order B'; transmitting 1 data is successfully transmitted 111, if the transmission is successful, the data is added -: / raw 2纟 return to prepare to transfer data step 101, if the transmission fails, the number of tiring failures to proceed to the next step; whether the number of failed failures exceeds - the number of scheduled retransmissions R113, if the failure 201146065 times more than R then I test #杳 4 filed.玄笔贝枓1 1 4, and return to the aforementioned step of preparing to transmit data 1 01, if the class Du + age A a ^, right 夭 - - the number has not exceeded R then proceed to the next step; determine whether CW is shrugging # «L , ^ ^ 疋 寺 于 in a maximum competition window parameter CWmax115, if CW does not equal CW equals Cwmax, 丨, 丨 return to the aforementioned selection B step 1〇3 to CWmax to perform the next step; and ping pong 11 6 The value of CW is multiplied back to the aforementioned step B of step B.
〇月> 閱圖4至圖8所示，如給定前述的無線通訊裝置 數目N為1〇〜4〇’訊框大小為⑽。字節_中傳輸迷 率（data rate)為2Mbps ’後退時間c為〇〜3〇〇個時槽 ()並心略通道不良造成的錯誤，即封包傳送錯誤只會 因為碰撞，如® 4所示，c = 〇即現有的二元指數退讓方‘ (BEB)之結果，可看出本發明將首次傳送的封包的b延長 口適的C’通道使用率可明顯提高，此現象在無線通訊裝 置數目N高時，意即網路負載高時，更加明顯，此外，該 合適的C與無線通訊裝置數目N有一正比關係。如圖5及 圖6所示’本發明加入該合適的c後系統的碰撞機率及 封包遺失率均顯著降低。如w 7所示，依本發明的方法， 百次傳送的封包均需多等待c，故傳送失敗的封包傳送時 相對有較高的優先權’延遲的變異量大幅降低。如圖8所 二可看出現有的二元指數退讓方法封包延遲變化程度大， 意即其延遲的抖動（jitte〇很大，本發明能使延遲的時間集 中於小範圍，意即延遲的抖動小，有訊務整型的功效。 綜上所述，本發明針對IEEE 8〇2 H錢區域網路標 201146065 有效提升高負载網 ，月b降低封包的抖 準的MAC提出了 —延後競爭退讓方法， 路之通道使用率，且有訊務整型的功效 動，此外還可提高網路資源使用的公平性 【圖式簡單說明】 圖1 : 一無線區域網路之架構圖。 圖2 :本發明之流程圖。 圖3 :本發明之部分訊號框架圖。 圖4··本發明於不同無線通訊裝置數目下之後退時間 與通道使用率關係圖。 圖5 ·本發明與二元指數退讓方法於無線通訊裝置數 目與碰撞機率關係下的比較圖。 圖6:本發明與=元指# 文退讓方法於無線通訊裝置數 目與封包遺失率關係下的比較圖。 圖7:本發明與二元指數退讓方法於無線通訊裝置數 目與訊框延遲的標準差關係下的比較圖。 圖8:本發明與二元指數退讓方法之訊框延遲機率密 度函數比較圖。 圖9 :二元指數退讓方法之流程圖。 圖1 〇 :二元指數退讓方法之部份訊號框架圖。 【主要元件符號說明】 1 〇無線存取點 2 〇行動站台 20A行動站台 [S] 12〇月> As shown in Figs. 4 to 8, the number N of the wireless communication devices as given above is 1 〇 4 〇 ’ frame size is (10). Byte_ medium transmission rate (data rate) is 2Mbps 'reverse time c is 〇~3〇〇 time slot () and the error caused by bad channel, that is, the packet transmission error will only be due to collision, such as ® 4 It can be seen that c = 〇 is the result of the existing binary index returnee ' (BEB), it can be seen that the present invention will significantly increase the appropriate C' channel usage rate of the b extension of the packet transmitted for the first time, this phenomenon in wireless communication When the number of devices N is high, that is, when the network load is high, it is more obvious. In addition, the appropriate C has a proportional relationship with the number N of wireless communication devices. As shown in Fig. 5 and Fig. 6, the collision probability and the packet loss rate of the system incorporating the suitable c system are significantly reduced. As shown by w7, according to the method of the present invention, packets transmitted in a hundred times need to wait for c more, so that the packet with a higher priority is delayed in the transmission of the failed transmission. As shown in Fig. 8, it can be seen that the existing binary exponential depreciation method has a large degree of packet delay variation, that is, its delayed jitter (jitte〇 is large, and the present invention can concentrate the delay time on a small range, that is, delay jitter. Small, there is the effect of traffic shaping. In summary, the present invention is directed to the IEEE 8〇2 H money regional network roadmap 201146065 to effectively improve the high-load network, and the monthly b-reduced packet jitter MAC proposed - delay competition concession Method, the channel usage rate of the road, and the efficiency of the traffic shaping, in addition to improve the fairness of the use of network resources [simplified diagram] Figure 1: Architecture diagram of a wireless area network. Figure 2: Figure 3 is a partial signal frame diagram of the present invention. Figure 4 is a diagram showing the relationship between the back-off time and the channel usage rate of the present invention in the number of different wireless communication devices. Figure 5 - The present invention and the binary index concession The method is a comparison diagram of the relationship between the number of wireless communication devices and the collision probability. Figure 6: Comparison of the method of the present invention and the = meta-referential method in the relationship between the number of wireless communication devices and the packet loss rate. Figure 7: The binary exponential depreciation method is compared with the standard deviation of the number of wireless communication devices and the frame delay.Figure 8: Comparison of the frame delay probability density function of the present invention and the binary exponential depreciation method. Figure 9: Binary index Flow chart of the method of concession. Figure 1 〇: Part of the signal frame of the binary exponential method. [Description of main component symbols] 1 〇 Wireless access point 2 〇 Mobile station 20A mobile station [S] 12