公开(公告)号：US20060094369A1

公开(公告)日：2006-05-04

申请号：US11259864

申请日：2005-10-27

申请人： Hien Nguyen

发明人： Hien Nguyen

IPC分类号： H04B17/00

CPC分类号： H04B17/382 ,  H04B17/345 ,  H04B17/354

摘要： An automatic channel selection (ACS) process enables an access point to determine a best channel available, i.e., the channel with a least amount of interference, for it operation. When ACS is enabled, the access point scans frequencies for all neighboring access points and their signal strengths. Based on this data, the access point then determines which frequency is least likely to be interfered with by these other access points. The access point switches itself to this frequency and begins operation. During normal operation, the access point may periodically rescan the air space and reevaluate its current operating channel. Preferably, every neighboring access point has its own channel, and the co-channel interference levels should be low enough so that there is a maximum coverage and high throughput for the network. If these characteristics cannot be achieved, the access point may then adjust its power automatically to reduce the interference level in the network. This automatic power adjustment (APA) feature preferably operates across a set of access points, each of which has the function. In this manner, the transmitting power of the neighboring access points in the wireless network is “cooperatively” adjusted to minimize the channel interference and maximize the coverage and throughput for the network. A method of determining optimal access point locations for access points that perform the ACS and APA functions is also described.

公开(公告)号：US20070153741A1

公开(公告)日：2007-07-05

申请号：US11646904

申请日：2006-12-28

申请人： Richard Blanchette ,  Martin Bouchard ,  Anil Gupta ,  Yannick Koehler ,  Gilbert Moineau ,  Frederic Mouveaux ,  Roger Sands ,  Pierre Trudeau

发明人： Richard Blanchette ,  Martin Bouchard ,  Anil Gupta ,  Yannick Koehler ,  Gilbert Moineau ,  Frederic Mouveaux ,  Roger Sands ,  Pierre Trudeau

IPC分类号： H04Q7/00

CPC分类号： H04W8/02 ,  H04L45/66 ,  H04W40/36 ,  H04W80/02 ,  H04W80/04

摘要： To enable devices to detect L3 roaming users and to take appropriate forwarding actions, L3 knowledge is introduced inside a bridge in a non-intrusive way. In particular, as a client moves from a subnet associated with a first network element to a subnet associated with a second network element, a determination is made regarding whether the client is roaming. This is done by evaluating a source IP address within a L3 packet header within a first frame received at the second network element. If, as a result of the evaluating step, it is determined that the client is roaming, an L2 bridge forwarding table in the second network element is configured to include a source MAC address of the client together with information identifying at least a destination interface for use in directing client data traffic back towards the subnet associated with the first network element. The first frame is then forwarded. In one embodiment, the traffic is directed back towards the subnet associated with the first network element via a GRE encapsulation tunnel, although any convenient tunneling mechanism can be used. According to another feature, given information cached at the foreign access point is used to enable the roaming client to continue to seamlessly receive inbound traffic prior to or during the configuration of the L2 bridge forwarding table (i.e., before any outbound traffic is actually sent from the client).

摘要翻译： 为了使设备能够检测L3漫游用户并采取适当的转发动作，L3桥梁内部以非侵入式方式引入知识。 特别地，当客户端从与第一网络元件相关联的子网移动到与第二网络元件相关联的子网时，确定客户端是否正在漫游。 这是通过评估在第二网络单元接收的第一帧内的L3分组报头内的源IP地址来完成的。 如果作为评估步骤的结果，确定客户端正在漫游，则第二网元中的L2桥转发表被配置为将客户端的源MAC地址与至少标识至少目的地接口的信息 用于将客户端数据业务引导回与第一网络元件相关联的子网。 然后转发第一帧。 在一个实施例中，尽管可以使用任何方便的隧道机制，但是业务通过GRE封装隧道被引导回到与第一网络元件相关联的子网。 根据另一特征，在外部接入点处缓存的给定信息被用于使得漫游客户端能够在配置L2网桥转发表之前或期间继续无缝地接收入站流量（即，在任何出站流量实际上从 客户端）。

公开(公告)号：US20060165103A1

公开(公告)日：2006-07-27

申请号：US10905922

申请日：2005-01-26

申请人： Pierre Trudeau ,  Stephane Laroche

发明人： Pierre Trudeau ,  Stephane Laroche

IPC分类号： H04L12/54 ,  H04L12/28

CPC分类号： H04L12/2854

摘要： A wireless network access device includes a radio and support for virtual access points. According to the invention, each virtual access point has an independently configurable quality-of-service profile. The per-VAP QoS support enables multiple services to be delivered from a single physical access point. A plurality of transmit/receive queues are associated with each virtual access point (VAP) configured on the access device. Each queue in the plurality of queues is associated with a given quality-of-service level, such as (in decreasing order of priority): voice, video, best effort data, and background data. The access device further includes a data transfer mechanism in the form of a data packet forwarding engine that, for each VAP, transfers data from the plurality of queues to enforce the per-VAP QoS policy.

摘要翻译： 无线网络接入设备包括无线电和对虚拟接入点的支持。 根据本发明，每个虚拟接入点具有可独立配置的服务质量简档。 每个VAP QoS支持使得可以从单个物理接入点传送多个服务。 多个发送/接收队列与在接入设备上配置的每个虚拟接入点（VAP）相关联。 多个队列中的每个队列与给定的服务质量级别相关联，例如（按优先级降序）：语音，视频，尽力而为数据和背景数据。 访问设备还包括数据分组转发引擎形式的数据传送机制，对于每个VAP，传输来自多个队列的数据以实施每VAP QoS策略。

公开(公告)号：US20060094371A1

公开(公告)日：2006-05-04

申请号：US11259866

申请日：2005-10-27

申请人： Hien Nguyen

发明人： Hien Nguyen

IPC分类号： H04B17/00

CPC分类号： H04W52/50 ,  H04B17/345 ,  H04B17/354 ,  H04B17/382

摘要： An automatic channel selection (ACS) process enables an access point to determine a best channel available, i.e., the channel with a least amount of interference, for it operation. When ACS is enabled, the access point scans frequencies for all neighboring access points and their signal strengths. Based on this data, the access point then determines which frequency is least likely to be interfered with by these other access points. The access point switches itself to this frequency and begins operation. During normal operation, the access point may periodically rescan the air space and reevaluate its current operating channel. Preferably, every neighboring access point has its own channel, and the co-channel interference levels should be low enough so that there is a maximum coverage and high throughput for the network. If these characteristics cannot be achieved, the access point may then adjust its power automatically to reduce the interference level in the network. This automatic power adjustment (APA) feature preferably operates across a set of access points, each of which has the function. In this manner, the transmitting power of the neighboring access points in the wireless network is “cooperatively” adjusted to minimize the channel interference and maximize the coverage and throughput for the network. A method of determining optimal access point locations for access points that perform the ACS and APA functions is also described.

公开(公告)号：US07366202B2

公开(公告)日：2008-04-29

申请号：US10730649

申请日：2003-12-08

申请人： Shimon B. Scherzer ,  Patrick A. Worfolk ,  Armin D. Haken ,  Ronen Vainish ,  Subburajan Ponnuswamy

发明人： Shimon B. Scherzer ,  Patrick A. Worfolk ,  Armin D. Haken ,  Ronen Vainish ,  Subburajan Ponnuswamy

IPC分类号： H04J1/00

CPC分类号： H04W16/14 ,  H04B7/02 ,  H04L1/02 ,  H04W16/02 ,  H04W16/10 ,  H04W72/08

摘要： Disclosed are systems and methods which provide interference mitigation by making alternative resources available within areas served by wireless communication links. Embodiments provide multiple channel availability in establishing wireless communication links to facilitate interference mitigation. Time domain techniques, spatial processing techniques, and/or frequency domain techniques may be implemented for spectrum management. Embodiments provide wireless base station configurations in which all or a plurality of base station sectors use a same frequency channel and/or in which each sector or a plurality of sectors use all frequency channels. Multi-channel strategies may be implemented such as to provide dynamic selection of a “best” frequency channel, to provide transmission of identical data on multiple channels for combining/selection at the receiver, and/or to provide for dividing the data for transmission on multiple channels.

摘要翻译： 公开的是通过在由无线通信链路服务的区域内提供替代资源来提供干扰减轻的系统和方法。 实施例在建立无线通信链路以便促进干扰减轻时提供多信道可用性。 时域技术，空间处理技术和/或频域技术可以被实现用于频谱管理。 实施例提供无线基站配置，其中全部或多个基站扇区使用相同的频道和/或其中每个扇区或多个扇区使用所有频率信道。 可以实现多信道策略，例如提供“最佳”频率信道的动态选择，以在多个信道上提供相同数据的传输，用于在接收机处进行组合/选择，和/或提供将数据划分到 多个频道

公开(公告)号：US20060256763A1

公开(公告)日：2006-11-16

申请号：US11430547

申请日：2006-05-09

申请人： Hien Nguyen ,  Pierre Trudeau ,  Anil Gupta ,  Roger Sands ,  Thomas Stefanski

发明人： Hien Nguyen ,  Pierre Trudeau ,  Anil Gupta ,  Roger Sands ,  Thomas Stefanski

IPC分类号： H04Q7/24

CPC分类号： H04L63/06 ,  H04L63/08 ,  H04L63/166 ,  H04W12/04 ,  H04W12/06 ,  H04W36/0011 ,  H04W36/0016 ,  H04W84/12 ,  H04W88/08

摘要： A fast roaming (handoff) service is provided for a WLAN infrastructure. A given mobile station (STA) obtains a pairwise master key (PMK) when it associates with an access point (AP) in the infrastructure. A neighbor graph identifies prospective APs to which the STA may then roam. At initialization, preferably the neighbor graph is fully-connected (i.e., each AP is assumed to be connected to every other AP). The PMK (obtained by the STA initially) is shared proactively with the neighbor APs as indicated in the neighbor graph. Thus, when the STA roams to a neighbor AP, because the PMK is already available, there is no requirement that the STA initiate a real-time request to an authentication server to re-associate to the new AP. Further, the new AP causes an update to the neighbor graph information implicitly by simply issuing a notification that it is now handling the STA that arrived from the prior AP; in this manner, the prior AP is confirmed as a neighbor, but there is no requirement for any inter-AP dialog before a given neighbor graph is updated. As roaming occurs the neighbor graph is pruned down (to reflect the actual neighbor AP connections) using the implicit notification data.

摘要翻译： 为WLAN基础设施提供快速漫游（切换）服务。 当给定移动站（STA）与基础设施中的接入点（AP）相关联时，获得成对主密钥（PMK）。 邻居图识别STA可能漫游的预期AP。 在初始化时，优选邻居图是完全连接的（即，假设每个AP被连接到每个其他AP）。 PMK（由STA最初获得）与邻居图中所示的相邻AP主动共享。 因此，当STA漫游到邻居AP时，由于PMK已经可用，所以不要求STA向认证服务器发起与新AP重新关联的实时请求。 此外，新的AP通过简单地发出它正在处理从先前的AP到达的STA的通知来隐式地更新邻居图信息; 以这种方式，先前的AP被确认为邻居，但是在给定的邻居图更新之前不需要任何AP间对话。 当漫游发生时，使用隐式通知数据修剪邻居图（以反映实际的邻居AP连接）。

公开(公告)号：US20080146240A1

公开(公告)日：2008-06-19

申请号：US11955055

申请日：2007-12-12

申请人： Pierre Trudeau

发明人： Pierre Trudeau

IPC分类号： H04Q7/20

CPC分类号： H04W28/16 ,  H04W28/20 ,  H04W36/26

摘要： Call admission control within a wireless network is implemented using a service controller that manages a set of access points. The call admission control (CAC) function for a given access point determines whether the access point has sufficient unused bandwidth to handle an additional call. The service controller makes this determination by monitoring the access points and evaluating certain probability functions and load conditions. In one embodiment, a determination of whether the access point has sufficient unused bandwidth to handle an additional call is a function of two (2) independent probabilities: (i) a probability of an active session moving to the access point from one or more neighbor access points, and (ii) a probability of an idle mobile device already associated with the access point entering into a new active session by initiating an inbound or outbound call. According to another aspect, the service controller issues and manages “call admission credits” among the set of access points, where a call admission credit value indicates a number of calls that idle mobile devices associated with the access point may initiate from the AP. The call admission credits value is a function of a determined load on the AP, and a mobility probability, which is a probability of an active call moving to the access point from one or more neighbor access points. The call admission credit value for the access point is adjusted as a function of a change of the load or in the mobility probability.

摘要翻译： 使用管理一组接入点的服务控制器来实现无线网络内的呼叫准入控制。 给定接入点的呼叫准入控制（CAC）功能确定接入点是否具有足够的未使用带宽来处理附加呼叫。 服务控制器通过监视接入点并评估某些概率函数和负载条件来进行此确定。 在一个实施例中，确定接入点是否具有足够的未使用带宽以处理附加呼叫是二（2）个独立概率的函数：（i）活动会话从一个或多个邻居移动到接入点的概率 接入点，以及（ii）已经通过发起入站或出站呼叫已经与接入点相关联的空闲移动设备进入新的活动会话的概率。 根据另一方面，服务控制器在接入点组中发出和管理“呼叫许可信用”，其中呼叫准入信用值指示与接入点相关联的空闲移动设备可以从AP发起的呼叫数量。 呼叫准入信用值是AP上确定的负载的函数，以及作为主动呼叫从一个或多个相邻接入点移动到接入点的概率的移动概率。 根据负载变化或移动概率来调整接入点的呼叫准入信用值。

公开(公告)号：US20060182077A1

公开(公告)日：2006-08-17

申请号：US11404309

申请日：2006-04-14

申请人： Shimon Scherzer ,  Patrick Worfolk

发明人： Shimon Scherzer ,  Patrick Worfolk

IPC分类号： H04Q7/24

CPC分类号： H04W28/18 ,  H04W52/24 ,  H04W72/1231 ,  H04W88/12

摘要： A technique is disclosed to schedule frame transmissions in a wireless local area network. The network includes a plurality of stations configured to communicate on the same frequency channel with a plurality of access points. A central controller examines the transmission characteristics between the various stations and access points and identifies frames that may be simultaneously transmitted by a subset of the access points to their intended stations.

公开(公告)号：US20060094370A1

公开(公告)日：2006-05-04

申请号：US11259865

申请日：2005-10-27

申请人： Hien Nguyen

发明人： Hien Nguyen

IPC分类号： H04B17/00

CPC分类号： H04W52/50 ,  H04B17/345 ,  H04B17/354 ,  H04B17/382

摘要： An automatic channel selection (ACS) process enables an access point to determine a best channel available, i.e., the channel with a least amount of interference, for it operation. When ACS is enabled, the access point scans frequencies for all neighboring access points and their signal strengths. Based on this data, the access point then determines which frequency is least likely to be interfered with by these other access points. The access point switches itself to this frequency and begins operation. During normal operation, the access point may periodically rescan the air space and reevaluate its current operating channel. Preferably, every neighboring access point has its own channel, and the co-channel interference levels should be low enough so that there is a maximum coverage and high throughput for the network. If these characteristics cannot be achieved, the access point may then adjust its power automatically to reduce the interference level in the network. This automatic power adjustment (APA) feature preferably operates across a set of access points, each of which has the function. In this manner, the transmitting power of the neighboring access points in the wireless network is “cooperatively” adjusted to minimize the channel interference and maximize the coverage and throughput for the network. A method of determining optimal access point locations for access points that perform the ACS and APA functions is also described.

公开(公告)号：US07031336B2

公开(公告)日：2006-04-18

申请号：US10306972

申请日：2002-11-27

申请人： Shimon B. Scherzer ,  Patrick A. Worfolk

发明人： Shimon B. Scherzer ,  Patrick A. Worfolk

IPC分类号： H04L12/43 ,  H04Q7/24

CPC分类号： H04W28/18 ,  H04W52/24 ,  H04W72/1231 ,  H04W88/12

摘要： A technique is disclosed to schedule frame transmissions in a wireless network. The network includes a plurality of stations configured to communicate on the same frequency channel with a plurality of access points. A central controller examines the transmission characteristics between the various stations and access points and identifies frames that may be simultaneously transmitted by a subset of the access points to their intended stations.

摘要翻译： 公开了一种在无线网络中调度帧传输的技术。 网络包括被配置为在同一频道上与多个接入点通信的多个站。 中央控制器检查各个站点和接入点之间的传输特性，并且识别可以由接入点的子集同时传输到其预定站的帧。