CN1114308C - 无线通信系统中分配无线资源的方法 - Google Patents

无线通信系统中分配无线资源的方法 Download PDF

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CN1114308C
CN1114308C CN99125634A CN99125634A CN1114308C CN 1114308 C CN1114308 C CN 1114308C CN 99125634 A CN99125634 A CN 99125634A CN 99125634 A CN99125634 A CN 99125634A CN 1114308 C CN1114308 C CN 1114308C
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wireless terminal
wireless
data
mistake
communication system
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CN1260658A (zh
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孙秉哲
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Samsung Electronics Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1887Scheduling and prioritising arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4604LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462LAN interconnection over a bridge based backbone
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/04Error control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

一种在无线通信系统中考虑到重新发送的无线资源分配方法。在包括多个无线终端和具有桥功能的单接入点(AP)的无线通信系统中,AP将无线资源分配给每个无线终端,并接收来自无线终端的数据。AP进行检验,以确定在从无线终端接收的数据中是否存在差错。当从数据中探测到差错时,AP在一帧内同时将差错发生消息发送给无线终端,并将用于数据重新发送的无线资源分配给无线终端。

Description

无线通信系统中分配 无线资源的方法
技术领域
本发明涉及一种在无线通信系统中分配无线资源的方法,更具体地说,本发明涉及一种在无线通信系统中考虑到重新发送的无线资源分配方法。
背景技术
一般来说,无线通信系统包括具有桥功能的单接入点(AP)和多个无线终端。每个无线终端都与AP共享无线资源,以便无线终端能与AP进行通信。在每个无线终端和AP之间定义关于共享无线资源的介质接入控制(MAC)模式和无线资源分配方法。
图1是无线终端和AP之间的传统无线资源分配方法的流程图。首先,在步骤112中,无线终端确定待发送的数据是否存在。如果待发送的数据存在,那么,在步骤114中,无线终端请求AP将无线资源分配给它。在步骤116,AP考虑到无线终端的无线资源分配请求和它自己的发送数据而将无线资源分配给无线终端。此时,无线资源可以是带宽或时隙。
其次,在步骤118中,无线终端以数据包或时间段为单位将数据发送给AP。在步骤120中,AP使用象循环冗余校验(CRC)那样的差错校验信息来确定从无线终端接收的数据中是否有差错发生。如果有差错发生,那么在步骤122中,AP将在接收的数据中存在差错这一消息通知给无线终端。然后,在步骤124中,无线终端请求AP分配重新发送的无线资源,以重发已有差错的数据。在步骤126中,AP分配无线终端请求的无线资源。因此,在步骤128中,无线终端将探测到差错的数据重发给AP。
然而,在图1所示的传统无线资源分配方法中,当从无线终端发送的数据中存在差错时,由于在AP和相应的无线终端之间对无线资源分配进行通信,因而数据的重新发送被延迟了。况且,每个无线终端将请求用于数据重发的无线资源分配的消息发送给AP会浪费掉无线资源,因而降低了实际数据的发送速率。
发明内容
本发明的目的是提供一种在包括单接入点(AP)和多个无线终端的无线通信系统中的无线资源分配方法,其中当从每个无线终端接收的数据中存在差错时,AP通知相应无线终端发生差错,并同时将无线资源分配给相应的无线终端,因而减少了数据发送所需的时间并提高了带宽使用的效率。
为了实现本发明的目的,提供了一种在包括多个无线终端和具有桥功能的单AP的无线通信系统中的无线资源分配方法。该方法包括如下步骤:在AP中将无线资源分配给相应的无线终端和接收来自无线终端的数据;由AP来进行检验,以确定在从无线终端接收的数据中是否存在差错;和当在检验步骤中AP探测到有数据差错时,在一帧内同时将发生差错的消息发送给无线终端和将重新发送数据的无线资源分配给无线终端。
附图说明
通过结合附图对优选实施例的详细描述,本发明的上述目的和优点将变得更加明显,附图中:
图1是在无线终端和接入点(AP)之间的传统无线资源分配方法的流程图;
图2是根据本发明的无线通信系统的结构;
图3是在图2所示的无线通信系统的环境之下一帧的结构;和
图4是根据本发明的如图2所示的无线通信系统中无线资源分配方法的流程图。
具体实施方式
参考图2,本发明的无线通信系统包括多个无线终端210和220以及单接入点(AP)230。无线终端210和220能通过AP 230相互通信。AP 230以及无线终端210和220使用公共无线资源相互通信。在AP 230和无线终端210和220之间定义无线介质接入控制(MAC)协议,以规定无线资源的接入控制方法。
当无线终端210和220的每一个有数据要发送时,它就请求AP 230将无线资源分配给它,然后,当无线资源被分配时它就发送数据。当从无线终端210和220的每一个接收的数据中探测到差错时,AP 230将发生差错的消息发送给无线终端210和220的每一个,并将无线资源分配给无线终端210和220的每一个。
图3显示了使用在图2所示的无线通信系统之中的帧结构。图3的帧是用来在每个无线终端和AP之间进行数据通信的时间单位。图3的帧结构划分为其中AP将消息发送给每个无线终端的下行链路时段和其中每个无线终端将消息发送给AP的上行链路时段。下行链路时段包括同步用的前置码、将消息发送给每个无线终端的广播时段和下载保留(reservation)时段。广播时段是用来发送所有无线终端都必须接收的消息。在广播时段期间,AP发送广播消息和各种控制信息,例如下载保留时段的长度、在下载保留时段期间无线终端接收的消息的位置和长度、争用时段的长度、上载(upload)保留时段的长度、分配给在上载保留时段期间将由无线终端发送的消息的位置和长度、和在前一帧的上载保留时段期间无线终端将其发送给AP的确认(ACK)信息或否定确认(NAK)信息。上行链路时段包括争用时段和上载保留时段,其中争用时段用来发送将在下一帧的上载保留时段期间被分配的、用于在下一帧中消息的发送的无线资源的保留请求消息,在上载保留时段中,每个无线终端将被分配时段的消息发送给AP。
图4是根据本发明的无线资源分配方法的流程图。首先,在步骤410中,无线终端进行检验,以确定在先进先出存储器类型的发送队列中是否存在待发送到AP中的数据。如果数据存在,则在步骤420中,无线终端请求AP进行无线资源分配。在步骤430中,AP将无线资源分配给请求无线资源分配的无线终端。在步骤440中,在图3所示的上行链路时段期间,接收到无线资源分配的无线终端以数据分组为单位将数据发送给AP。此时,无线终端将诸如CRC的差错校验信息加到数据之中,并以数据分组的格式发送它们。
在步骤450中,AP 230利用差错校验信息进行检验,以确定在从无线终端接收的数据中是否有差错发生。如果AP 230从被接收的数据中探测到差错,那么,AP在图3所示的一帧内同时将发生差错的消息发送给相应的无线终端,并将无线资源分配给相应的无线终端。例如,在步骤460中,在下行链路时段的广播时段期间,AP将差错发生消息发送给无线终端,并且同时将诸如带宽或时隙的无线资源分配给无线终端,使无线终端在上行链路时段的上载保留时段期间将有差错的数据重新发送给AP。差错发生消息包括NAK信息和在下行链路时段的广播时段期间发送的无线资源分配信息。换句话说,当在从无线终端接收到的数据中探测到差错时,AP自动地将无线资源分配给相应的无线终端,而不管无线终端的无线资源分配请求如何。当接收到差错发生消息时,在步骤470中,无线终端利用AP分配的无线资源重新发送数据。
另一方面,如果AP并没有从被接收的数据中探测到差错,那么AP在下行链路时段的广播时段期间将ACK信息发送给无线终端,并等待检验待发送数据的存在还是不存在。
如上所述,根据本发明,当AP探测到在数据中有差错发生时,AP在通知相应无线终端发生差错数据的同时,将用于重新发送的无线资源分配给发送无线终端。于是,出现了差错的数据被立即重新发送,因而减少了数据发送的延迟。另外,无线终端并不需要将关于重新发送有差错的数据的无线资源分配请求消息发送给AP,因而提高了无线通信系统中带宽使用的效率。
虽然本发明是通过优选实施例进行具体显示和描述的,但是熟悉本技术的工作人员应该理解到,对其中的形式和细节所作的各种变动均不偏离所附权利要求书所限制的本发明的精神和范围。

Claims (1)

1.一种在包括多个无线终端和具有桥功能的单接入点的无线通信系统中的无线资源分配方法,该方法包括如下步骤:
(a)在接入点中将无线资源分配给相应的无线终端,并接收来自无线终端的数据;
(b)进行检验,以确定在步骤(a)由接入点从无线终端接收的数据中是否存在差错;和
(c)当在步骤(b)中接入点探测到数据差错时,同时将差错发生消息发送给无线终端,并将用于重新发送数据的无线资源分配给无线终端,其中,在包括下行链路时段和上行链路时段的一帧之内的下行链路时段的广播时段期间,差错发生消息被发送给相应的无线终端,而同时用于重新发送的无线资源被分配给相应的无线终端。
CN99125634A 1998-12-31 1999-12-28 无线通信系统中分配无线资源的方法 Expired - Fee Related CN1114308C (zh)

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CN1260658A (zh) 2000-07-19
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GB2347585B (en) 2001-03-14
JP2000209232A (ja) 2000-07-28
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