WO2011124151A1 - 占用信道时间的分配方法及接入点设备与接入网络系统 - Google Patents

占用信道时间的分配方法及接入点设备与接入网络系统 Download PDF

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Publication number
WO2011124151A1
WO2011124151A1 PCT/CN2011/072547 CN2011072547W WO2011124151A1 WO 2011124151 A1 WO2011124151 A1 WO 2011124151A1 CN 2011072547 W CN2011072547 W CN 2011072547W WO 2011124151 A1 WO2011124151 A1 WO 2011124151A1
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Prior art keywords
channel
terminal
idle
level
rate level
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PCT/CN2011/072547
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English (en)
French (fr)
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刘方
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for allocating channel time and an access point device and an access network system. Background technique
  • Wireless Local Access Network (WLAN) technology is widely used in many fields such as home, business, and campus. After years of evolution, WLAN technology has formed a multi-generation technology standard coexistence situation, and the rate has grown from 2M, 11M to 300M, or even 600M. Since each generation of technical standards requires forward compatibility with the original low-speed standard equipment, in the actual networking, new and old standards will be encountered in the mixed operation of different rate devices. For example, different signal quality terminals under the same access point (AP, Access Point) can vary from a few times to a hundred times.
  • AP Access Point
  • DCF Distributed Coordination Function
  • the DCF mechanism is as follows: All devices (including the AP and the terminal) monitor whether the channel is idle. If the channel is at least idle (DIFS, Distributed Coordination Function interface space), it is determined that the channel is available, and the device waits for a random time, if During the random time, it indicates the time that the communication needs to occupy the channel, and other devices need to wait during this time.
  • the packets sent by all devices may carry network allocation vector (NAV) information, and the NAV indicates the time value at which the channel will be occupied.
  • NAV network allocation vector
  • the probability that each terminal uses the DCF mechanism to obtain the channel usage rights is substantially equal.
  • the channel time occupied by each terminal for transmitting and receiving the same data is also very different, and the transmission rate is different.
  • the lower the occupied channel time the longer the channel time is occupied, and the high-speed terminal is significantly suppressed, so that the throughput of the high-speed terminal is even equal to that of the low-speed terminal, resulting in a significant drop in the throughput of the entire system.
  • Embodiments of the present invention provide an allocation method for occupying channel time, and an access point device and an access network.
  • the network system can effectively reduce the time that the low-speed terminal occupies the channel, and ensures that the high-speed terminal has more time to occupy the channel.
  • An embodiment of the present invention provides a method for allocating channel time, including:
  • the terminal channel corresponding to the level higher than the sub-high rate level is notified to be idle; determining whether the channel has been idle since the previous notification, and whether the release time T2 corresponding to the next highest rate level is reached;
  • An embodiment of the present invention provides an access point device, including:
  • a first notification module configured to notify all terminal channels that the channel will be occupied within a time period, and trigger the second notification module to perform related operations
  • a second notification module configured to notify that the terminal channel corresponding to the highest rate level is idle, determine whether the channel has been idle since the previous notification, and whether the release time T1 corresponding to the highest rate level is reached, and if yes, notify the second highest rate.
  • the terminal channel corresponding to the level above the level is idle, and it is judged whether the channel has been idle since the previous notification, whether the release time corresponding to the next highest rate level is reached ,2, and the loop is determined until the terminal channel corresponding to the lowest rate level is determined to be idle.
  • An embodiment of the present invention provides an access network system, including:
  • More than one terminal used to be notified by the access point device that the channel will be occupied within the time, waits until the access point device notifies that the channel is idle, and begins to compete for the channel.
  • the embodiments of the present invention include the following beneficial effects:
  • one cycle time is divided into the release times T1, ⁇ 2, Tn corresponding to the n rate levels, and at the beginning of one cycle, all terminal channels are notified to be occupied in the T time. And notifying that the terminal channel corresponding to the highest rate class is idle, notifying that the terminal channel corresponding to the level higher than the secondary high rate level is idle since the previous notification that the channel has been idle to reach the time T1, and the time has elapsed since the previous notification that the channel has been idle.
  • the terminal channel corresponding to the level higher than the third high rate level is notified that the terminal channel is idle, and all the terminal channels are notified to be occupied in the T time when the previous notification channel has been idle to reach the time Tn, so that the highest , the second highest, the third highest...
  • the terminal corresponding to the lowest rate class can only obtain the channel in the T time, T2+T3+ +Tn time, ⁇ 3+ ⁇ 4+ + ⁇ n time Tn time. Therefore, the time for the low-speed terminal to occupy the channel is reduced, and the high-speed terminal can ensure that the channel is occupied for a larger time, thereby improving the throughput of the system.
  • FIG. 1 is a schematic diagram of an embodiment of a method for allocating channel time in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of another embodiment of a method for allocating channel time in an embodiment of the present invention.
  • the terminal corresponding to each rate class can compete for the time of acquiring the channel;
  • FIG. 4 is a schematic diagram of an embodiment of an access point device in an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a first notification module in the embodiment shown in FIG. 4;
  • FIG. 6 is a schematic diagram of a second notification module in the embodiment shown in FIG. 4;
  • FIG. 7 is a schematic diagram of another embodiment of an access point device in an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an embodiment of an access network system in an embodiment of the present invention. detailed description
  • Embodiments of the present invention provide a method for allocating channel time and an access point device and an access network system. The details are described below separately.
  • the main idea of the method for allocating channel time in the embodiment of the present invention is as follows:
  • the interval T is divided into two release times corresponding to the rate class, for example, divided into three periods, which are respectively the release time T1 corresponding to the highest rate level, the release time ⁇ 2 corresponding to the secondary high rate level, and the release corresponding to the lowest rate level.
  • Time ⁇ 3, ⁇ ⁇ 1+ ⁇ 2+ ⁇ 3;
  • At the beginning of a cycle it is notified that all terminal channels will be occupied within the time, and then the terminal channel corresponding to the highest rate class is notified that it is idle, and the time has elapsed since the previous notification that the channel has been idle.
  • the terminal channel corresponding to the level higher than the sub-high rate level is idle, and the terminal channel corresponding to the level above the lowest rate level is idle when the previous notification channel has reached the idle time 2, so that the terminal corresponding to the highest rate level is available.
  • the channel can be obtained in a timely manner, and the terminal corresponding to the second highest rate class can only obtain the channel in the time of ⁇ 2+ ⁇ 3, and the terminal corresponding to the lowest rate class can only acquire the channel in the time of ⁇ 3, thereby reducing the channel.
  • the time that the low-speed terminal occupies the channel ensures that the high-speed terminal can occupy the channel for a longer time. Thereby increasing the throughput of the system.
  • one cycle time is divided into the release times corresponding to the n rate levels, which are respectively the release time T1 corresponding to the highest rate level, and the release time ⁇ 2 corresponding to the next highest rate level, the lowest rate.
  • the release time corresponding to each rate class may be preset according to different requirements of the service, or may be obtained by periodically acquiring the number of terminals corresponding to each rate class, and setting the release time corresponding to each rate class according to the number of terminals.
  • All channels can be notified by the ⁇ at the beginning of the , time.
  • the channel will be occupied within the ⁇ time.
  • the specific notification mode can be: When the channel is idle for the minimum interval, ⁇ send the clear at the lowest rate of the lowest rate level. (CTS, Clear To Send) message, the NAV time carried by the message is T, so that all terminals can demodulate the NAV, and it is determined that the channel will be occupied in T time.
  • CTS Clear To Send
  • the AP can also send a newly defined message through a dedicated logical channel, which indicates that the channel will be occupied in the T time, and set a function module capable of receiving and identifying the newly defined message for all terminals.
  • the highest rate level is the highest rate level.
  • the AP may send the CTS packet at the lowest rate of the highest rate level when the channel is idle, and the NAV time carried by the packet is 0, and the terminal channel corresponding to the highest rate level is notified that the terminal channel is idle.
  • the terminal corresponding to the highest rate class can start to compete for the channel, and other terminals still consider the channel occupied because they are not notified, and cannot compete for the channel.
  • the AP can also send a newly defined message at a lowest rate of the highest rate level through a dedicated logical channel, the message indicates that the channel is idle, and a function module capable of identifying the newly defined message is set for all terminals. .
  • step 103 judging from the previous notification that the terminal channel has been idle, whether the highest rate level corresponding release time T1 is reached, if yes, step 104 is performed, otherwise step 103 is performed;
  • the previous notification that the terminal channel is idle means step 102.
  • the level above the sub-high rate level is the highest and the second highest rate level.
  • the terminal channel corresponding to the highest rate class When the terminal channel corresponding to the highest rate class is idle, and the release time T1 corresponding to the highest rate class is reached, the terminal channel corresponding to the level above the secondary high rate level is notified to be idle, so that the terminal corresponding to the next highest rate level is also It is possible to start competing for the channel, and the terminal corresponding to the level below the sub-high rate level still considers that the channel is occupied and cannot compete for the channel.
  • the CTS message carrying the NAV time of 0 is sent at the lowest rate of the second highest rate level to notify the terminal channel corresponding to the level above the secondary high rate level that the terminal channel is idle.
  • the AP needs to wait until the channel idle minimum interval time DIFS (the AP can be set to wait for a random time) before sending a message to notify all terminals that the channel will be occupied in the T time. .
  • step 105 judging from the previous notification that the terminal channel has been idle, whether to reach the release time T2 corresponding to the next highest rate level, if yes, go to step 106, otherwise go to step 105;
  • the previous notification that the terminal channel is idle means step 104.
  • the third high rate level here refers to a level one level lower than the next highest rate level.
  • step 106 The terminal channel corresponding to the level above the lowest rate level is notified that the terminal channel is empty; The loop process in the manner of step 102 to step 106 is omitted in steps 106 to 107.
  • step 107 it is determined whether the terminal channel corresponding to the level lower than the lower low rate level has started to idle, and whether the release time corresponding to the second low rate level is reached. If yes, step 107 is performed.
  • the terminal channel corresponding to the level above each rate level is notified that the terminal channel is idle, that is, steps 102, 104, 106, ... or 107, which may be:
  • the CTS ⁇ 1 is sent at the lowest rate of the current rate class, and the time value carried by the packet is 0, and the current rate level is the lowest rate level corresponding to the terminal that needs to notify the channel that the channel is idle.
  • step 108 Determine whether the terminal channel corresponding to the lowest rate level is idle, and whether the release time Tn corresponding to the lowest rate level is reached. If yes, execute step 101; otherwise, perform step 108.
  • the AP waits until the channel idle minimum interval time DIFS, and then performs step 101 to start a new cycle.
  • the AP may buffer the downlink packet that needs to be sent to the terminal corresponding to the level below the current rate level after notifying that the terminal channel corresponding to the level above each rate level is idle, until the level corresponding to the rate level corresponding to the terminal is notified.
  • the buffered downlink packet is sent to the terminal, and the current rate level is the lowest rate level corresponding to the terminal that needs to notify the channel that the channel is idle, so as to prevent the terminal corresponding to the level below the current rate level from being downlinked.
  • the AP may buffer the downlink packet if it receives the downlink packet sent to the terminal corresponding to the next highest rate class, and wait until the secondary high rate level is notified. After the corresponding terminal channel is idle, the downlink packet is sent to the terminal.
  • one cycle time T is divided into release times T1, T2, Tn corresponding to n rate levels, and at the beginning of one cycle, all terminal channels are notified to be occupied in T time.
  • the terminal channel corresponding to the highest rate class is notified that the terminal channel is idle, and the terminal channel corresponding to the level higher than the next highest rate level is idle when the previous notification channel has been idle to reach the time T1, and the time T2 is reached since the previous notification that the channel has been idle.
  • another embodiment of the method for allocating channel time in the embodiment of the present invention includes:
  • the clear message to be sent is sent at the lowest rate of the lowest rate class, and the time value carried by the packet is ⁇ ;
  • ⁇ does not need to wait for a random time after the channel idle minimum interval DIFS to send a CTS message, which can effectively ensure that the channel is preempted. It can be understood that it is also possible to set ⁇ to wait for a random time after the channel idle DIFS to send a CTS message.
  • the destination address of the CTS message sent by ⁇ can be the local address or the address of a specific terminal.
  • the clearing of the to-be-sent packet is sent at the lowest rate of the highest rate, and the time value carried by the packet is 0;
  • step 203 Determine whether the release time T1 corresponding to the highest rate level is reached from the execution of step 202, if yes, execute step 204, otherwise perform step 203;
  • the clearing of the to-be-sent packet is sent at the lowest rate of the second highest rate, and the time value carried by the packet is 0;
  • step 205 judging whether the self-execution step 204 reaches the release time T2 corresponding to the next highest rate level, if yes, step 206 is performed, otherwise step 205 is performed;
  • the clearing of the to-be-sent packet is sent at the lowest rate of the lowest rate, and the time value carried by the packet is 0;
  • the AP buffer needs to be sent to the level below the highest rate level, that is, the downlink message of the terminal corresponding to the next highest rate level and the lowest rate level.
  • the cached sub-high rate level is corresponding.
  • the downlink packet of the terminal is sent to the terminal, and after performing step 206, the downlink packet of the terminal corresponding to the lowest rate level is sent to the terminal, to avoid The terminal corresponding to the level below the pre-rate level is awakened by the downlink >3 ⁇ 4 text, and begins to compete for the channel.
  • step 207 Determine whether the self-execution step 206 starts to reach the release time T3 corresponding to the lowest rate level. If yes, execute step 201, otherwise perform step 207;
  • the AP periodically obtains the proportion of the number of terminals corresponding to the three rate levels that are accessed, and adjusts the ratio of T1, T2, and T3 to T according to the ratio, so that each rate level corresponds to the release time and each The number of terminals corresponding to the rate class is proportional.
  • FIG. 3 is a schematic diagram of the time that the terminal corresponding to each rate class can compete for the channel in the embodiment shown in FIG.
  • the setting is 4 megaseconds
  • the terminal corresponding to the highest rate class can compete for the channel within 6 megaseconds, and the terminals corresponding to the second highest and lowest rate levels respectively
  • the channel can be acquired only in 4 megaseconds and 1 millisecond. It can be seen that the present embodiment can reduce the time occupied by the low-speed user by increasing the channel occupied by the low-speed terminal, and improve the time occupied by the high-speed user.
  • the throughput of the system can reduce the time occupied by the low-speed user by increasing the channel occupied by the low-speed terminal, and improve the time occupied by the high-speed user. The throughput of the system.
  • the access point device and the access network system in the embodiments of the present invention are described in detail below.
  • an embodiment of an access point device in an embodiment of the present invention includes:
  • the first notification module 401 is configured to notify all terminal channels that they are to be occupied within a time limit, and trigger the second notification module 402 to perform related operations;
  • the second notification module 402 is configured to notify that the terminal channel corresponding to the highest rate level is idle, determine whether the channel has been idle since the previous notification, and whether the release time T1 corresponding to the highest rate level is reached. If yes, notify the secondary high rate level.
  • the terminal channel corresponding to the level is idle, and it is judged whether the channel has been idle since the previous notification, whether the release time corresponding to the next highest rate level is reached ⁇ 2, and the loop is determined until the terminal channel corresponding to the lowest rate level is determined to be idle.
  • one cycle time is divided into the release times T1, ⁇ 2, ... ⁇ corresponding to the n rate levels, and the release time corresponding to each rate level can be preset according to different requirements of the service,
  • the number of terminals corresponding to each rate class may be periodically obtained, and the release time corresponding to each rate level may be set according to the number of terminals.
  • the device in this embodiment may further include:
  • a buffer sending module configured to: after the terminal channel corresponding to the current rate level is notified that the terminal channel is idle, buffer the downlink packet that needs to be sent to the terminal corresponding to the level below the current rate level, until the terminal is notified of the corresponding rate level When the terminal channel corresponding to the level is idle, the buffered downlink packet is sent to the terminal.
  • FIG. 5 is a schematic diagram of a first notification module in the embodiment shown in FIG. 4.
  • the first notification module 401 may include:
  • the first determining unit 411 is configured to determine whether the channel is idle for a minimum interval time, and if yes, triggering the first sending unit 421 to perform a related operation;
  • the first sending unit 421 is configured to send, at a lowest rate of the lowest rate, a clear message to be sent, the time value carried by the packet is T, and the second notification module 402 is triggered to perform related operations.
  • the first notification module 401 can also send a newly defined message through a dedicated logical channel, the message indicates that the channel will be occupied in the T time, and set a function module capable of receiving and identifying the newly defined message for all terminals, Notify all terminal channels that they will be occupied within T time.
  • FIG. 6 is a schematic diagram of a second notification module in the embodiment shown in FIG. 4.
  • the second notification module 402 may include:
  • the second sending unit 412 is configured to: when the channel is idle for a minimum interval, send the clear to send message at the lowest rate of the current rate level in the order of the rate level from high to low, and the time value of the packet is 0. ;
  • the second determining unit 422 is configured to determine whether the release time corresponding to the current rate level is reached after the second sending unit 412 sends the clearing of the to-be-sent message, and if yes, triggering the second sending unit 412 to minimize the channel idle interval. At the time, the lowest rate of the following primary rate class sends a clear pending message.
  • the second sending unit sends the clearing of the to-be-sent message according to the high-to-low rate. Therefore, the current rate level here is the current rate of clearing the to-be-sent packet, and the next-level rate.
  • the rating refers to a rate level that is one level lower than the current rate level.
  • one cycle time T is divided into release times T1, T2, Tn corresponding to n rate levels, and at the beginning of a cycle, all terminal channels are notified that they will be occupied within the time. Then notify the highest rate class that the corresponding terminal channel is idle, since the previous notification that the channel is idle.
  • the terminal channel corresponding to the sub-high rate level is notified that the corresponding terminal channel is idle, and the terminal channel corresponding to the level higher than the third high rate level has been idle since the previous notification that the channel has reached the idle time T2, ...
  • the channel can only be acquired during the Tn time, ⁇ 2+ ⁇ 3+ + ⁇ time, ⁇ 3+ ⁇ 4+ + ⁇ time, thereby reducing the time occupied by the low-speed terminal and ensuring that the high-speed terminal can occupy the channel for a longer time. Improve system throughput.
  • the access point device in the embodiment of the present invention will be described in detail below by taking the release time corresponding to the three rate levels as an example.
  • another embodiment of the access point device in the embodiment of the present invention includes:
  • the first notification module 701 is configured to send a clear to-be-sent packet at a minimum rate of the lowest rate level when the channel is idle for a minimum interval, and the time value carried by the packet is T, and trigger the second notification module 702 to perform related operations. ;
  • the second notification module 702 is configured to: when the channel is idle for a minimum interval, send a clear packet to be sent with a time value of 0 at the lowest rate of the highest rate level; determine whether the packet is sent since the previous transmission clears the to-be-sent packet The release time corresponding to the highest rate class; if it is reached, when the channel is idle for the minimum interval time, the packet with the time value of 0 is sent at the lowest rate of the second highest rate class to clear the to-be-sent message; At the beginning of the text, whether the release time corresponding to the next highest rate level is reached; if it is reached, when the channel is idle for the minimum interval time, the message to be sent with the time value of 0 is sent at the lowest rate of the lowest rate level; Sending to clear the to-be-sent packet, whether the release time corresponding to the lowest rate level is reached; if yes, triggering the first notification module 702 to perform the related operation;
  • the buffer sending module 703 is configured to: after the second notification module 702 sends the clear to-be-sent message at the lowest rate of the highest rate level, the buffer needs to be sent to a level below the highest rate level, that is, the terminal corresponding to the second highest and lowest rate levels.
  • the second notification module 702 sends the clearing of the to-be-sent message at the lowest rate of the second highest rate
  • the downlink message of the terminal corresponding to the second highest rate level is sent to the terminal until the second notification module 702 has the lowest
  • the downlink packet of the terminal corresponding to the lowest rate class is sent to the terminal;
  • the periodic adjustment module 704 is configured to periodically obtain a ratio of the number of terminals corresponding to each rate level of access; adjust a ratio between T1, T2, ..., Tn according to the ratio, so that each rate level corresponds to The release time is proportional to the number of terminals corresponding to each rate class.
  • an embodiment of an access network system in an embodiment of the present invention includes:
  • the access point device 801 is configured to notify all terminal channels that the channel will be occupied within the time; notify the terminal channel corresponding to the level above the highest rate level that the terminal channel is idle; determine whether the channel has been idle since the previous notification, and whether the highest rate level is reached.
  • More than one terminal 802 for being notified by the access point device that the channel will be occupied within the time, waits until the access point device notifies that the channel is idle, and begins to compete for the channel.
  • a plurality of terminals of different rates may be included. It is assumed that there are 8 terminals of three speed grades in the system, wherein the highest, second highest, and lowest rate levels correspond to 2, 5, and 1, respectively, and the sum is 8 milliseconds, the highest, the second highest, and the lowest rate level.
  • the corresponding release times T1, ⁇ 2, and ⁇ 3 are 2 milliseconds, 5 milliseconds, and 1 millisecond, respectively.
  • the terminal corresponding to the highest rate class can compete for the channel time of 8 milliseconds, corresponding to the secondary high rate level.
  • the time at which the terminal can compete for the acquisition of the channel is 6 milliseconds, and the time at which the terminal corresponding to the lowest rate level can compete for the acquisition of the channel is 1 millisecond.
  • the access point device 801 can also be used to buffer the downlink that needs to be sent to the terminal corresponding to the level below the current rate level after notifying that the terminal channel corresponding to the level above each rate level is idle. Text, until the terminal is notified of the corresponding rate level When the terminal channel corresponding to the level is idle, the buffered downlink message is sent to the terminal, and the current rate level is the lowest rate level corresponding to the terminal that needs to notify the channel that the channel is idle, so as to avoid the terminal corresponding to the level below the current rate level. Wake up by the downlink message and start to compete for the channel.
  • the access point device 802 can also be used to periodically obtain the proportion of the number of terminals corresponding to each rate level of access, and adjust T1, T2, ... Tn according to the ratio.
  • the ratio is such that the release time corresponding to each rate level is proportional to the number of terminals corresponding to each rate level.
  • the access network system in this embodiment can reduce the time that the low-speed terminal occupies the channel, and ensures that the high-speed terminal can occupy the channel for a larger time, thereby improving the throughput of the system.
  • the program can be stored in a computer readable storage medium.
  • the storage medium can include: ROM, RAM, disk or CD, etc.

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Description

占用信道时间的分配方法及接入点设备与接入网络系统 技术领域
本发明涉及通信技术领域， 具体涉及一种占用信道时间的分配方法及接 入点设备与接入网络系统。 背景技术
无线局域网（ WLAN, Wireless Local Access Network )技术在家庭、企业、 园区等众多领域得到广泛运用。 WLAN技术经过多年演进形成了多代技术标 准共存局面， 速率从 2M、 11M发展到 300M, 甚至 600M。 由于每一代技术标 准要求向前兼容原有的低速标准设备， 因此， 在实际组网中会遇到新旧标准 不同速率设备混合运用的情况。 例如， 同一接入点 （AP, Access Point )下不 同信号质量终端， 最大最小工作速率可相差几倍到上百倍。
在 WLAN中， 同一 AP下的多个终端一般釆用分布式协调功能 （DCF , Distributed Coordination Function )机制竟争获取信道使用权。 DCF机制如下： 所有设备（包括 AP与终端）监听信道是否空闲， 若监听到信道至少空闲了最 小间隔时间 ( DIFS , Distributed Coordination Function interface space ), 则确定 信道可用， 设备再等待一段随机时间， 若在该随机时间内， 表示本次通信还 需占用信道的时间， 在该时间内其它设备需等待。 其中， 所有设备发送的报 文中可以携带网络分配向量（ NAV , network allocation vector )信息， NAV表 示信道将被占用的时间值。 为了让低速终端能解调报文中的 NAV, 釆用高速 标准的 AP在兼容低速终端时， 需要用低速率发送报文。
通常，各个终端釆用 DCF机制竟争获取信道使用权的几率是大致相等的， 但是， 当终端实际工作速率相差较大时， 每个终端收发相同数据所占用信道 时间也大不相同， 发送速率越低占用信道时间越长， 因此， 低速终端可占用 大部分信道时间， 而高速终端被明显抑制， 使得高速终端的吞吐量甚至和低 速终端相当， 导致整个系统的吞吐量大大下降。 发明内容
本发明实施例提供一种占用信道时间的分配方法及接入点设备与接入网 络系统， 能够有效减少低速终端占用信道的时间， 保证高速终端有较多占用 信道的时间。
本发明实施例提供了一种占用信道时间的分配方法， 包括：
通知所有终端信道将在 T时间内被占用；
通知最高速率等级以上的等级所对应终端信道已空闲；
判断自前一次通知终端信道已空闲开始， 是否达到最高速率等级对应的 放行时间 T1 ;
若达到， 则通知次高速率等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已空闲开始， 是否达到次高速率等级对应的 放行时间 T2;
依此循环， 直至判定自通知最低速率等级所对应终端信道已空闲开始， 达到最低速率等级对应的放行时间 Tn, Τ=Τ1+Τ2+ +Τη。
本发明实施例提供了一种接入点设备， 包括：
第一通知模块， 用于通知所有终端信道将在 Τ时间内被占用， 并触发第二 通知模块执行相关操作；
第二通知模块， 用于通知最高速率等级以上的等级所对应终端信道已空 闲， 判断自前一次通知终端信道已空闲开始， 是否达到最高速率等级对应的 放行时间 T1 , 若达到， 则通知次高速率等级以上的等级所对应终端信道已空 闲， 判断自前一次通知终端信道已空闲开始， 是否达到次高速率等级对应的 放行时间 Τ2, 依此循环， 直至判定自通知最低速率等级所对应终端信道已空 闲开始， 达到最低速率等级对应的放行时间 Tn, T=T1+T2+ +Τη, 并触发 第一通知模块执行相关操作。
本发明实施例提供了一种接入网络系统， 包括：
接入点设备， 用于通知所有终端信道将在 Τ时间内被占用； 通知最高速率 等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已空闲 开始， 是否达到最高速率等级对应的放行时间 T1 ; 若达到， 则通知次高速率 等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已空闲 开始， 是否达到次高速率等级对应的放行时间 Τ2; 依此循环， 直至判定自通 知最低速率等级所对应终端信道已空闲开始， 达到最低速率等级对应的放行 时间 Tn, T=T1+T2+ +Tn;
一个以上终端， 用于被接入点设备通知信道将在 Τ时间内被占用时， 开始 等待， 直至被接入点设备通知信道已空闲时， 开始竟争获取信道。
与现有技术相比， 本发明实施例包括如下有益效果：
本发明实施例中，将一个周期时间 Τ分为 η个速率等级对应的放行时间 Tl、 Τ2, ... ... Tn, 在一个周期开始时， 通知所有终端信道将在 T时间内被占用， 再 通知最高速率等级所对应终端信道已空闲， 在自前一次通知信道已空闲开始 达到时间 T1时通知次高速率等级以上的等级所对应终端信道已空闲， 在自前 一次通知信道已空闲开始达到时间 T2时通知第三高速率等级以上的等级所对 应终端信道已空闲， ... ...在自前一次通知信道已空闲开始达到时间 Tn时通知 所有终端信道将在 T时间内被占用， 使得最高、 次高、 第三高 ... ...最低速率等 级所对应终端分另只能在 T时间内、 T2+T3+ +Tn时间内、 Τ3+Τ4+ +Τη 时间内 Tn时间内竟争获取信道， 从而减少低速终端占用信道的时间， 保证高速终端能够较多时间占用信道， 从而提高系统的吞吐量。 附图说明
图 1是本发明实施例中占用信道时间的分配方法的一个实施例的示意图； 图 2是本发明实施例中占用信道时间的分配方法的另一实施例的示意图； 图 3是图 2所示实施例中每个速率等级所对应终端可竟争获取信道的时间 示意图；
图 4是本发明实施例中接入点设备的一个实施例的示意图；
图 5是图 4所示实施例中第一通知模块的示意图；
图 6是图 4所示实施例中第二通知模块的示意图；
图 7是本发明实施例中接入点设备的另一实施例的示意图；
图 8是本发明实施例中接入网络系统的一个实施例的示意图。 具体实施方式
本发明实施例提供一种占用信道时间的分配方法及接入点设备与接入网 络系统。 以下分别进行详细说明。
本发明实施例中占用信道时间的分配方法的主要思路为： 将一个周期时 间 T分为两个以上的速率等级对应的放行时间， 例如分为三段时间， 分别为最 高速率等级对应的放行时间 T1、 次高速率等级对应的放行时间 Τ2、 以及最低 速率等级对应的放行时间 Τ3 , Τ=Τ1+Τ2+Τ3; 在一个周期开始时通知所有终端 信道将在 Τ时间内被占用， 再通知最高速率等级所对应终端信道已空闲， 在自 前一次通知信道已空闲开始达到时间 T1时通知次高速率等级以上的等级所对 应终端信道已空闲， 在自前一次通知信道已空闲开始达到时间 Τ2时通知最低 速率等级以上的等级所对应终端信道已空闲， 使得最高速率等级所对应终端 可在 Τ时间内竟争获取信道， 次高速率等级所对应终端只能在 Τ2+Τ3时间内竟 争获取信道， 而最低速率等级所对应终端只能在 Τ3时间内竟争获取信道， 从 而减少低速终端占用信道的时间， 保证高速终端能够较多时间占用信道， 从 而提高系统的吞吐量。
本发明实施例中占用信道时间的分配方法的一个实施例包括：
101、 通知所有终端信道将在 Τ时间内被占用；
本实施例中， 将一个周期时间 Τ分为 η个速率等级对应的放行时间， 分别 为最高速率等级对应的放行时间 T1 , 次高速率等级对应的放行时间 Τ2, ... ... 最低速率等级对应的放行时间 Τη, Τ=Τ1+Τ2+ ... ... +Τη, 每个速率等级可以包 括一个终端速率范围。
每个速率等级对应的放行时间可以根据业务的不同需求预置， 也可以由 ΑΡ定期获取每个速率等级对应的终端数量， 并根据该终端数量设置每个速率 等级对应的放行时间。
可以由 ΑΡ在 Τ时间开始时通知 ΑΡ下的所有终端， 信道将在 Τ时间内被占 用， 具体通知方式可以为： 当信道空闲最小间隔时间时， ΑΡ以最低速率等级 的最低速率发送清除待发（CTS, Clear To Send )报文， 该报文携带的 NAV时 间为 T, 使得所有终端都能够解调该 NAV, 确定信道将在 T时间内被占用。
可以理解的是， AP也可以通过专用逻辑通道发送一新定义报文， 该报文 表示信道将在 T时间内被占用， 并为所有终端设置能够接收并识别该新定义报 文的功能模块。
102、 通知最高速率等级以上的等级所对应终端信道已空闲；
最高速率等级以上的等级即最高速率等级。 在执行步骤 101之后， 可以由 AP在信道空闲最小间隔时间时， 以最高速率 等级的最低速率发送 CTS报文， 该报文携带的 NAV时间为 0, 通知最高速率等 级所对应终端信道已空闲， 使得最高速率等级所对应终端能够开始竟争获取 信道， 而其它终端由于没有被通知到而仍然认为信道被占用而不能竟争获取 信道。
可以理解的是， 也可以由 AP通过专用逻辑通道， 以最高速率等级的最低 速率发送新定义报文， 该报文表示信道已空闲， 并为所有终端设置能够识别 该新定义报文的功能模块。
103、 判断自前一次通知终端信道已空闲开始， 是否达到最高速率等级对 应的放行时间 T1 , 若达到， 则执行步骤 104, 否则执行步骤 103;
此处的前一次通知终端信道已空闲是指步骤 102。
104、 通知次高速率等级以上的等级所对应终端信道已空闲；
次高速率等级以上的等级即最高与次高速率等级。
当从通知最高速率等级所对应终端信道已空闲开始， 达到最高速率等级 对应的放行时间 T1时， 则通知次高速率等级以上的等级所对应终端信道已空 闲， 使得次高速率等级所对应终端也能够开始竟争获取信道， 而次高速率等 级以下的等级所对应终端仍然认为信道被占用而不能竟争获取信道。
同样， 可以当信道空闲最小间隔时间时， 以次高速率等级的最低速率发 送携带的 NAV时间为 0的 CTS报文， 来通知次高速率等级以上的等级所对应终 端信道已空闲。
同于步骤 101 ,当达到时间 T1时， AP需要等到信道空闲最小间隔时间 DIFS 之后 （可设置 AP不需要再等待一段随机时间）， 才能发送报文通知所有终端， 信道将在 T时间内被占用。
105、 判断自前一次通知终端信道已空闲开始， 是否达到次高速率等级对 应的放行时间 T2, 若达到， 则执行步骤 106, 否则执行步骤 105;
此处的前一次通知终端信道已空闲是指步骤 104。
106、 通知第三高速率等级以上的等级所对应终端信道已空闲；
此处的第三高速率等级指的是比次高速率等级低一级的等级。
107、 通知最低速率等级以上的等级所对应终端信道已空； 步骤 106至步骤 107中省略了中间按照步骤 102至步骤 106的方式的循环过 程。
步骤 107之前， 判断自通知次低速率等级以上的等级所对应终端信道已空 闲开始， 是否达到次低速率等级对应的放行时间， 若达到， 则执行步骤 107。
以上，通知每个速率等级以上的等级所对应终端信道已空闲，即步骤 102、 104、 106... ...或 107, 具体均可以为：
当信道空闲最小间隔时间时， 以当前速率等级的最低速率发送 CTS^ l , 该报文携带的时间值为 0 , 当前速率等级为当前需要通知信道已空闲的终端所 对应的最低速率等级。
108、 判断自通知最低速率等级所对应终端信道已空闲开始， 是否达到最 低速率等级对应的放行时间 Tn, 若达到， 则执行步骤 101 , 否则执行步骤 108。
当自通知最低速率等级所对应终端信道已空闲开始， 达到最低速率等级 对应的放行时间 Tn时， AP等到信道空闲最小间隔时间 DIFS之后， 执行步骤 101 , 开始新的一个周期。
AP可以在通知每个速率等级以上的等级所对应终端信道已空闲之后， 緩 存需要发送给当前速率等级以下的等级所对应终端的下行报文， 直至通知该 终端所对应速率等级以上的等级所对应终端信道已空闲时， 将緩存的下行报 文发送给该终端， 当前速率等级为当前需要通知信道已空闲的终端所对应的 最低速率等级， 以避免当前速率等级以下的等级所对应终端被下行 ^艮文唤醒， 而开始竟争获取信道。
举例来说， 在通知最高速率等级所对应终端信道已空闲之后， AP若接收 到发往次高速率等级所对应终端的下行报文， 则可以緩存该下行报文， 等到 通知次高速率等级所对应终端信道已空闲之后， 再将该下行报文发送给终端。
本实施例中， 将一个周期时间 T分为 n个速率等级对应的放行时间 T1、 T2, ... ... Tn, 在一个周期开始时， 通知所有终端信道将在 T时间内被占用， 再 通知最高速率等级所对应终端信道已空闲， 在自前一次通知信道已空闲开始 达到时间 T1时通知次高速率等级以上的等级所对应终端信道已空闲， 在自前 一次通知信道已空闲开始达到时间 T2时通知第三高速率等级以上的等级所对 应终端信道已空闲， ... ...在自前一次通知信道已空闲开始达到时间 Tn时通知 所有终端信道将在 T时间内被占用， 使得最高、 次高、 第三高 ... ...最低速率等 级所对应终端分另只能在 Τ时间内、 Τ2+Τ3+ +Τη时间内、 Τ3+Τ4+ +Τη 时间内 Τη时间内竟争获取信道， 从而减少低速终端占用信道的时间， 保证高速终端能够较多时间占用信道， 从而提高系统的吞吐量。
为便于理解， 下面以将 Τ分为 3个速率等级对应的放行时间为例， 对本发 明实施例中占用信道时间的分配方法进行详细说明。
请参阅图 2 , 本发明实施例中占用信道时间的分配方法的另一实施例包 括：
201、 当信道空闲最小间隔时间时， 以最低速率等级的最低速率发送清除 待发报文， 该报文携带的时间值为 Τ;
此处， ΑΡ不需要在信道空闲最小间隔时间 DIFS之后再等待一段随机时间 才发送 CTS报文， 能够有效保证 ΑΡ抢占到信道。 可以理解的是， 也可以设置 ΑΡ在信道空闲 DIFS之后等待一段随机时间才发送 CTS报文。
ΑΡ发送的 CTS"^文的目的地址可以为本端地址， 也可以为特定终端的地 址。
202、 当信道空闲最小间隔时间时， 以最高速率等级的最低速率发送清除 待发报文， 该报文携带的时间值为 0;
203、判断自执行步骤 202开始是否达到最高速率等级对应的放行时间 T1 , 若达到， 则执行步骤 204, 否则执行步骤 203;
204、 当信道空闲最小间隔时间时， 以次高速率等级的最低速率发送清除 待发报文， 该报文携带的时间值为 0;
205、判断自执行步骤 204开始是否达到次高速率等级对应的放行时间 T2, 若达到， 则执行步骤 206, 否则执行步骤 205;
206、 当信道空闲最小间隔时间时， 以最低速率等级的最低速率发送清除 待发报文， 该报文携带的时间值为 0;
在执行步骤 202之后， AP緩存需要发送给最高速率等级以下的等级， 即次 高速率等级和最低速率等级所对应终端的下行报文， 在执行步骤 204之后， 将 緩存的次高速率等级所对应终端的下行报文发送给该终端， 在执行步骤 206之 后， 将緩存的最低速率等级所对应终端的下行报文发送给该终端， 以避免当 前速率等级以下的等级所对应终端被下行 >¾文唤醒， 而开始竟争获取信道。
207、判断自执行步骤 206开始是否达到最低速率等级对应的放行时间 T3 , 若达到， 则执行步骤 201 , 否则执行步骤 207;
本实施例中， AP定期获取接入的 3个速率等级对应的终端数量的比例， 并 根据该比例调整 Tl , T2和 T3分别占 T的比例， 使得每个速率等级对应的放行 时间与每个速率等级对应的终端数量成正比。
举例来说， 当 AP获取到最高、 次高、 最低速率等级对应的终端数量的比 例为 2: 3: 1时， 那么 Tl : T2: T3=2: 3: 1。 请参阅图 3 , 图 3为图 2所示实施 例中每个速率等级所对应终端可竟争获取信道的时间示意图。 如图 3所示， 若 4叚设 Τ为 6豪秒， 那么， 一个周期内， 最高速率等级所对应终端可以在 6豪秒内 竟争获取信道， 而次高、 最低速率等级所对应终端分别只能在 4豪秒、 1毫秒 内竟争获取信道， 可见， 本实施例通过周期性地抑制低速终端竟争获取信道， 能够减少低速用户占用信道的时间， 提高高速用户占用信道的时间， 提高系 统的吞吐量。
下面对本发明实施例中接入点设备与接入网络系统进行详细说明。
请参阅图 4, 本发明实施例中接入点设备的一个实施例包括：
第一通知模块 401 , 用于通知所有终端信道将在 Τ时间内被占用， 并触发 第二通知模块 402执行相关操作；
第二通知模块 402, 用于通知最高速率等级所对应终端信道已空闲， 判断 自前一次通知终端信道已空闲开始， 是否达到最高速率等级对应的放行时间 T1 , 若达到， 则通知次高速率等级以上的等级所对应终端信道已空闲， 判断 自前一次通知终端信道已空闲开始， 是否达到次高速率等级对应的放行时间 Τ2, 依此循环， 直至判定自通知最低速率等级所对应终端信道已空闲开始， 达到最低速率等级对应的放行时间 Τη, Τ=Τ1+Τ2+ +Τη, 并触发第一通知 模块 401执行相关操作。
本实施例中， 将一个周期时间 Τ分为 η个速率等级对应的放行时间 T1、 Τ2, ... ... Τη, 每个速率等级对应的放行时间可以根据业务的不同需求预置， 也可以由 ΑΡ定期获取每个速率等级对应的终端数量， 并根据该终端数量设置 每个速率等级对应的放行时间。 本实施例中设备还可以包括：
緩存发送模块， 用于在通知当前速率等级以上的等级所对应终端信道已 空闲之后， 緩存需要发送给当前速率等级以下的等级所对应终端的下行报文， 直至通知该终端所对应速率等级以上的等级所对应终端信道已空闲时， 将緩 存的下行报文发送给该终端。
请参阅图 5 , 图 5为图 4所示实施例中第一通知模块的示意图， 第一通知模 块 401可以包括：
第一判断单元 411 , 用于判断信道是否空闲最小间隔时间， 若是， 则触发 第一发送单元 421执行相关操作；
第一发送单元 421 , 用于以最低速率等级的最低速率发送清除待发报文， 该报文携带的时间值为 T , 并触发第二通知模块 402执行相关操作。
第一通知模块 401也可以通过专用逻辑通道发送一新定义报文， 该报文表 示信道将在 T时间内被占用， 并为所有终端设置能够接收并识别该新定义报文 的功能模块， 以通知所有终端信道将在 T时间内被占用。
请参阅图 6 , 图 6为图 4所示实施例中第二通知模块的示意图， 第二通知模 块 402可以包括：
第二发送单元 412 , 用于当信道空闲最小间隔时间时， 按速率等级从高到 低的顺序， 依次以当前速率等级的最低速率发送清除待发报文， 该报文携带 的时间值为 0;
第二判断单元 422 , 用于判断自第二发送单元 412前一次发送清除待发报 文开始， 是否达到当前速率等级对应的放行时间， 若达到， 则触发第二发送 单元 412当信道空闲最小间隔时间时， 以下一级速率等级的最低速率发送清除 待发报文。
此处需要说明的是， 第二发送单元按照从高到低的速率等级发送清除待 发报文， 因此， 此处的当前速率等级为当前发送清除待发报文的速率等级， 下一级速率等级指的是比当前速率等级低一级的速率等级。
本实施例中， 将一个周期时间 T分为 n个速率等级对应的放行时间 T1、 T2, ... ... Tn, 在一个周期开始时， 通知所有终端信道将在 Τ时间内被占用， 再 通知最高速率等级所对应终端信道已空闲， 在自前一次通知信道已空闲开始 达到时间 T1时通知次高速率等级以上的等级所对应终端信道已空闲， 在自前 一次通知信道已空闲开始达到时间 T2时通知第三高速率等级以上的等级所对 应终端信道已空闲， ... ...在自前一次通知信道已空闲开始达到时间 Tn时通知 所有终端信道将在 Τ时间内被占用， 使得最高、 次高、 第三高 ... ...最低速率等 级所对应终端分另只能在 Τ时间内、 Τ2+Τ3+ +Τη时间内、 Τ3+Τ4+ +Τη 时间内 Tn时间内竟争获取信道， 从而减少低速终端占用信道的时间， 保证高速终端能够较多时间占用信道， 从而提高系统的吞吐量。
为便于理解， 下面以将 T分为 3个速率等级对应的放行时间为例， 对本发 明实施例中接入点设备进行详细说明。
请参阅图 7 , 相对于图 4所示实施例， 本发明实施例中接入点设备的另一 实施例包括：
第一通知模块 701 , 用于当信道空闲最小间隔时间时， 以最低速率等级的 最低速率发送清除待发报文， 该报文携带的时间值为 T, 并触发第二通知模块 702执行相关操作；
第二通知模块 702 , 用于当信道空闲最小间隔时间时， 以最高速率等级的 最低速率发送携带的时间值为 0的清除待发报文； 判断自前一次发送清除待发 报文开始， 是否达到最高速率等级对应的放行时间； 若达到， 则当信道空闲 最小间隔时间时， 以次高速率等级的最低速率发送携带的时间值为 0的清除待 发报文； 判断自前一次发送清除待发报文开始， 是否达到次高速率等级对应 的放行时间； 若达到， 则当信道空闲最小间隔时间时， 以最低速率等级的最 低速率发送携带的时间值为 0的清除待发报文； 判断自前一次发送清除待发报 文开始， 是否达到最低速率等级对应的放行时间； 若达到， 则触发第一通知 模块 702执行相关操作；
緩存发送模块 703 , 用于在第二通知模块 702以最高速率等级的最低速率 发送清除待发报文之后， 緩存需要发送给最高速率等级以下的等级， 即次高 和最低速率等级所对应终端的下行 文， 直至第二通知模块 702以次高速率等 级的最低速率发送清除待发报文之后， 将次高速率等级所对应终端的下行报 文发送给该终端， 直至第二通知模块 702以最低速率等级的最低速率发送清除 待发报文之后， 将最低速率等级所对应终端的下行报文发送给该终端； 定期调整模块 704, 用于定期获取接入的每个速率等级对应的终端数量的 比例； 根据所述比例调整 Tl , T2... ... Tn之间的比例， 使得每个速率等级对应 的放行时间与每个速率等级对应的终端数量成正比。
举例来说， 当 ΑΡ获取到最高、 次高、 最低速率等级对应的终端数量的比 例为 2: 3: 1时， 那么 Tl : Τ2: Τ3=2: 3: 1。 若假设 Τ为 6豪秒， 那么， 一个 周期内， 最高速率等级所对应终端可以在 6豪秒内竟争获取信道， 而次高、 最 低速率等级所对应终端分别只能在 4豪秒、 1毫秒内竟争获取信道， 可见， 本 实施例通过周期性地抑制低速终端竟争获取信道， 能够减少低速用户占用信 道的时间， 提高高速用户占用信道的时间， 从而提高系统的吞吐量。
请参阅图 8, 本发明实施例中接入网络系统的一个实施例包括：
接入点设备 801 , 用于通知所有终端信道将在 Τ时间内被占用； 通知最高 速率等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已 空闲开始， 是否达到最高速率等级对应的放行时间 T1 ; 若达到， 则通知次高 速率等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已 空闲开始， 是否达到次高速率等级对应的放行时间 Τ2; 依此循环， 直至判定 自通知最低速率等级所对应终端信道已空闲开始， 达到最低速率等级对应的 放行时间 Tn, T=T1+T2+ +Τη;
一个以上终端 802 , 用于被接入点设备通知信道将在 Τ时间内被占用时， 开始等待， 直至被接入点设备通知信道已空闲时， 开始竟争获取信道。
接入网络系统中， 可以包括多个不同速率的终端。 假设系统中共有三种 速率等级的 8个终端， 其中， 最高、 次高、 最低速率等级所对应终端分别有 2 个、 5个、 1个， 并且 Τ为 8毫秒， 最高、 次高、 最低速率等级对应的放行时间 Tl、 Τ2、 Τ3分别为 2毫秒、 5毫秒、 1毫秒， 那么在一个周期 Τ内， 最高速率等 级所对应终端可以竟争获取信道的时间为 8毫秒， 次高速率等级所对应终端可 以竟争获取信道的时间为后 6毫秒， 最低速率等级所对应终端可以竟争获取信 道的时间为 1毫秒。
接入点设备 801除了能够实现上述功能之外， 还可以用于在通知每个速率 等级以上的等级所对应终端信道已空闲之后， 緩存需要发送给当前速率等级 以下的等级所对应终端的下行报文， 直至通知该终端所对应速率等级以上的 等级所对应终端信道已空闲时， 将緩存的下行报文发送给该终端， 当前速率 等级为当前需要通知信道已空闲的终端所对应的最低速率等级， 以避免当前 速率等级以下的等级所对应终端被下行报文唤醒， 而开始竟争获取信道。
接入点设备 802除了能够实现上述功能之外， 还可以用于定期获取接入的 每个速率等级对应的终端数量的比例， 根据所述比例调整 Tl , T2... ... Tn之间 的比例， 使得每个速率等级对应的放行时间与每个速率等级对应的终端数量 成正比。
同于图 1所示实施例， 本实施例中的接入网络系统能够减少低速终端占用 信道的时间， 保证高速终端能够较多时间占用信道， 从而提高系统的吞吐量。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成， 该程序可以存储于一计算机可 读存储介质中， 存储介质可以包括： ROM、 RAM, 磁盘或光盘等。
以上对本发明实施例所提供的占用信道时间的分配方法及接入点设备与 接入网络系统进行了详细介绍， 本文中应用了具体个例对本发明的原理及实 施方式进行了阐述， 以上实施例的说明只是用于帮助理解本发明的方法及其 核心思想； 同时， 依据本发明的思想， 在具体实施方式及应用范围上均会有 改变之处， 综上所述， 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种占用信道时间的分配方法， 其特征在于， 包括：
通知所有终端信道将在时间 τ内被占用；
通知最高速率等级以上的等级所对应终端信道已空闲；
判断自前一次通知终端信道已空闲开始， 是否达到最高速率等级对应的 放行时间 T1 ;
若达到， 则通知次高速率等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已空闲开始， 是否达到次高速率等级对应的 放行时间 T2;
依此循环， 直至判定自通知最低速率等级所对应终端信道已空闲开始， 达到最低速率等级对应的放行时间 Tn, Τ=Τ1+Τ2+ +Τη。
2、 根据权利要求 1所述方法， 其特征在于， 所述通知所有终端信道将在 Τ 时间内被占用， 具体包括：
当信道空闲最小间隔时间时， 以最低速率等级的最低速率发送清除待发 报文， 该报文携带的时间值为
3、 根据权利要求 1或 2所述方法， 其特征在于， 通知每个速率等级以上的 等级所对应终端信道已空闲， 具体包括：
当信道空闲最小间隔时间时， 以当前速率等级的最低速率发送清除待发 报文， 该报文携带的时间值为 0, 当前速率等级为当前需要通知信道已空闲的 终端所对应的最低速率等级。
4、 根据权利要求 1-3任一所述方法， 其特征在于， 所述时间1\ Tl、 Τ2 或 Tn携带在无线局域网 WLAN管理报文的网络分配向量 NAV信息中。
5、 根据权利要求 4所述方法， 其特征在于， 所述方法还包括：
在通知每个速率等级以上的等级所对应终端信道已空闲之后， 緩存需要 发送给当前速率等级以下的等级所对应终端的下行 ^艮文， 直至通知该终端所 对应速率等级以上的等级所对应终端信道已空闲时， 将緩存的下行报文发送 给该终端， 当前速率等级为当前需要通知信道已空闲的终端所对应的最低速 率等级。
6、 根据权利要求 4所述方法， 其特征在于， 所述方法还包括： 定期获取接入的每个速率等级对应的终端数量的比例；
根据所述比例调整 Tl , T2... ... Tn之间的比例， 使得每个速率等级对应的 放行时间与每个速率等级对应的终端数量成正比。
7、 一种接入点设备， 其特征在于， 包括：
第一通知模块， 用于通知所有终端信道将在 Τ时间内被占用， 并触发第二 通知模块执行相关操作；
第二通知模块， 用于通知最高速率等级以上的等级所对应终端信道已空 闲， 判断自前一次通知终端信道已空闲开始， 是否达到最高速率等级对应的 放行时间 T1 , 若达到， 则通知次高速率等级以上的等级所对应终端信道已空 闲， 判断自前一次通知终端信道已空闲开始， 是否达到次高速率等级对应的 放行时间 Τ2, 依此循环， 直至判定自通知最低速率等级所对应终端信道已空 闲开始， 达到最低速率等级对应的放行时间 Tn, T=T1+T2+ +Τη, 并触发 第一通知模块执行相关操作。
8、 根据权利要求 7所述设备， 其特征在于， 第一通知模块包括： 第一判断单元， 用于判断信道是否空闲最小间隔时间， 若是， 则触发第 一发送单元执行相关操作；
第一发送单元， 用于以最低速率等级的最低速率发送清除待发报文， 该 报文携带的时间值为 Τ , 并触发第二通知模块执行相关操作。
9、 根据权利要求 7或 8所述设备， 其特征在于， 所述设备还包括： 緩存发送模块， 用于在通知每个速率等级以上的等级所对应终端信道已 空闲之后， 緩存需要发送给当前速率等级以下的等级所对应终端的下行报文， 直至通知该终端所对应速率等级以上的等级所对应终端信道已空闲时， 将緩 存的下行报文发送给该终端， 当前速率等级为当前需要通知信道已空闲的终 端所对应的最低速率等级。
10、 根据权利要求 7-9任一所述设备， 其特征在于， 所述设备还包括： 定期调整模块， 用于定期获取接入的每个速率等级对应的终端数量的比 例； 根据所述比例调整 Tl , Τ2... ... Tn之间的比例， 使得每个速率等级对应的 放行时间与每个速率等级对应的终端数量成正比。
11、 一种接入网络系统， 其特征在于， 包括： 接入点设备， 用于通知所有终端信道将在 T时间内被占用； 通知最高速率 等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已空闲 开始， 是否达到最高速率等级对应的放行时间 T1 ; 若达到， 则通知次高速率 等级以上的等级所对应终端信道已空闲； 判断自前一次通知终端信道已空闲 开始， 是否达到次高速率等级对应的放行时间 Τ2; 依此循环， 直至判定自通 知最低速率等级所对应终端信道已空闲开始， 达到最低速率等级对应的放行 时间 Tn, T=T1+T2+ +Τη;
一个以上终端， 用于被接入点设备通知信道将在 Τ时间内被占用时， 开始 等待， 直至被接入点设备通知信道已空闲时， 开始竟争获取信道。
12、 根据权利要求 11所述系统， 其特征在于， 接入点设备还用于在通知 每个速率等级以上的等级所对应终端信道已空闲之后， 緩存需要发送给当前 速率等级以下的等级所对应终端的下行报文， 直至通知该终端所对应速率等 级以上的等级所对应终端信道已空闲时， 将緩存的下行报文发送给该终端， 当前速率等级为当前需要通知信道已空闲的终端所对应的最低速率等级。
13、 根据权利要求 11或 12所述系统， 其特征在于， 接入点设备还用于定 期获取接入的每个速率等级对应的终端数量的比例， 根据所述比例调整 T1， Τ2... ... Tn之间的比例， 使得每个速率等级对应的放行时间与每个速率等级对 应的终端数量成正比。
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