116 results about "Frame aggregation" patented technology

Apparatus and methods implement aggregation frames and allocation frames. The aggregation frames include a plurality of MSDUs or fragments thereof aggregated or otherwise combined together. An aggregation frame makes more efficient use of the wireless communication resources. The allocation frame defines a plurality of time intervals. The allocation frame specifies a pair of stations that are permitted to communicate with each other during each time interval as well as the antenna configuration to be used for the communication. This permits stations to know ahead of time when they are to communicate, with which other stations and the antenna configuration that should be used. A buffered traffic field can also be added to the frames to specify how much data remains to be transmitted following the current frame. This enables network traffic to be scheduled more effectively.

A method aggregates frames to be transmitted over a channel in a wireless network into a single frame. Multiple MSDU frames having identical destination addresses and identical traffic classes, received in the media access control layer from the logical link layer in a transmitting station are aggregated into a single aggregate MPDU frame, which can be transmitted on the channel to a receiving station. In addition, aggregate MSDU frames with different destination addresses and different traffic classes received from the media access control layer can be further aggregated into a single aggregate PPDU frame before transmission.

A frame format for frame aggregation into a physical-layer packet employs an aggregated frame descriptor appended to one or more sub-frames. Each sub-frame comprises a header comprising logical-layer and sub-frame protocol information, optional verification information to verify the sub-frame data, and aggregated user data. The aggregated frame descriptor includes information identifying the packet as conforming to an aggregated frame format, and sub-frame descriptors identifying at least one of a position, a length, and a data rate of a corresponding sub-frame. The aggregated frame is then formed into a physical layer packet for transmission through a medium.

A method and apparatus for aggregating packets in a wireless communication system. The data to be transmitted is selected and packetized and formed into frames for transmission. Rather than send each frame individually, frames are grouped and transmitted with grouping indicia informing the recipients how to acknowledge successful receipt of the transmitted data. ACKs are sent at a predetermined time, or all together, divided by subcarrier in the case of an OFDMA network.

A packet network employs frame aggregation to reduce the number of physical-layer frames employed to transfer a given amount of user data. A packet network might employ physical (PHY) and medium access control (MAC) layers of a wireless local area network (WLAN) operating in accordance with one or more IEEE 802.11 standards. Frame aggregation combines several separate, higher-layer frames with user data into one PHY-layer frame, thus increasing the amount of user data per PHY-layer frame transmitted. Frame aggregation improves the efficiency by reducing both PHY-layer overhead and MAC-layer overhead.

Some embodiments relate to a network comprising two RBridges connected by a link where the two RBridges are not the ingress and egress RBridge for said frames, wherein said RBridges automatically exchange information as to their support of hop-by-hop reversible frame aggregation, reversible header compression, and reversible data compression, and wherein if both RBridges support any or all of these features in the same fashion, one or more of said features are automatically applied to appropriate frames at the transmitting RBridge and removed at the receiving RBridge, increasing the throughput of the link.

A method of generating an aggregate frame having a header unit, which carries MAC-header information applicable to one or more data units of said aggregate frame. Since each data unit of the aggregate frame no longer needs to carry the full MAC-header information, the overhead associated with the MAC header can be significantly reduced. At the receiver, the full MAC header corresponding to the data unit is reconstructed by (i) matching the appropriate header and data units to one another and (ii) combining the information present in the header unit and the compressed header portion of the data unit. Embodiments of the present invention are capable of improving the data throughput, for example, in an entertainment network having paired source and destination devices (e.g., a DVD player and an LCD screen) with a relatively large amount of data streamed from the former to the latter.

An aggregation scheduler that determines which frames are to be aggregated in an aggregate at a specific time, and allocates a time and duration for each responder of the aggregate. The AP maintains information for each of its clients, including whether the client is in an awake or doze state and the time stamp arrival (TSA) for each frame received from the client by the AP. When an AP obtains channel access, it only aggregates frames for those clients that are awake. From the TSA and the voice packet arrival interval for the client, the AP can compute how many voice frames are waiting at the client since the AP received the last frame from the client. Knowing the number of voice frames waiting at the voice client and the transmission rate, enables the AP to accurately ascertain the response time and duration for the voice client.

A method aggregates frames to be transmitted over a channel in a wireless network into a single frame. Multiple MSDU frames having identical destination addresses and identical traffic classes, received in the media access control layer from the logical link layer in a transmitting station are aggregated into a single aggregate MPDU frame, which can be transmitted on the channel to a receiving station. In addition, aggregate MSDU frames with different destination addresses and different traffic classes received from the media access control layer can be further aggregated into a single aggregate PPDU frame before transmission.

A method and apparatus for aggregating packets in a wireless communication system. The data to be transmitted is selected and packetized and formed into frames for transmission. Rather than send each frame individually, frames are grouped and transmitted with grouping indicia informing the recipients how to acknowledge successful receipt of the transmitted data. ACKs are sent at a predetermined time, or all together, divided by subcarrier in the case of an OFDMA network.

A frame format for frame aggregation into a physical-layer packet employs an aggregated frame descriptor appended to one or more sub-frames. Each sub-frame comprises a header comprising logical-layer and sub-frame protocol information, optional verification information to verify the sub-frame data, and aggregated user data. The aggregated frame descriptor includes information identifying the packet as conforming to an aggregated frame format, and sub-frame descriptors identifying at least one of a position, a length, and a data rate of a corresponding sub-frame. The aggregated frame is then formed into a physical layer packet for transmission through a medium.

A method of generating an aggregate frame having a header unit, which carries MAC-header information applicable to one or more data units of said aggregate frame. Since each data unit of the aggregate frame no longer needs to carry the full MAC-header information, the overhead associated with the MAC header can be significantly reduced. At the receiver, the full MAC header corresponding to the data unit is reconstructed by (i) matching the appropriate header and data units to one another and (ii) combining the information present in the header unit and the compressed header portion of the data unit. Embodiments of the present invention are capable of improving the data throughput, for example, in an entertainment network having paired source and destination devices (e.g., a DVD player and an LCD screen) with a relatively large amount of data streamed from the former to the latter.

Method and system for discrete soft handoff of a mobile terminal in a wireless CDMA network. A plurality of mobile terminal-base station channels used for soft handoff are reserved to perform soft handoff of a mobile terminal. Soft handoff of the mobile terminal is then performed in a discrete fashion by first predicting which of the reserved channels will be "strong" and "weak" channels for transmission of the next CDMA data frame. At least one of the strong channels is included in the active set of handoff legs used to transmit the next CDMA data frame. The next data frame is then transmitted via only those channels within the active set. This process repeats, wherein the strong and weak channels are predicted prior to the transmission of each CDMA data frame, at least one strong channel is included in the active set for each CDMA data frame, and each CDMA data frame is transmitted via those channels in the active set. Soft handoff occurs because those channels used to communicate each CDMA data frame will change based on the predicted channel strength for each reserved handoff leg. Because weak channels are not used for soft handoff, additional processing complexity, power consumption, and network architecture difficulties associated with prior art soft handoff methods are avoided. Yet there is no substantial loss in performance, because those CDMA data frames that would have been communicated over weak channels are insignificant when a best CDMA data frame is obtained by either CDMA frame aggregation or selection techniques. Thus, the present invention reduces processing requirements, power consumption, and architectural difficulties associated with soft handoff at substantially no performance loss.

A method of the communication includes communicating at least one physical layer frame. The physical layer frame is formed by dynamically varying an aggregate packet size in response to a condition of a channel used for communicating voice and / or data. Here, the step of dynamically varying aggregate packet size may involve modifying a number of content frames to form the physical layer frame. The physical layer frame may correspond with a payload having at least two content frames and at least one IP header. Each content frame may include a voice frame and / or a data frame.

A packet network employs frame aggregation to reduce the number of physical-layer frames employed to transfer a given amount of user data. A packet network might employ physical (PHY) and medium access control (MAC) layers of a wireless local area network (WLAN) operating in accordance with one or more IEEE 802.11 standards. Frame aggregation combines several separate, higher-layer frames with user data into one PHY-layer frame, thus increasing the amount of user data per PHY-layer frame transmitted. Frame aggregation improves the efficiency by reducing both PHY-layer overhead and MAC-layer overhead.

A method and system for defining a transmission of data within a transmission opportunity (TXOP) is described. Aspects of the present system and method are related to wireless local area network (WLAN) systems. In one embodiment, aspects of the present system may be utilized within a WLAN system operating in accordance with frame aggregation mechanisms. Other aspects of the system specify the role of access point (AP) and non-AP stations operating in a bidirectional single receiver aggregation procedure. Aspects of the described system and method provide control to an AP or other station to limit the duration of the response burst, including acknowledgement message, aggregated with one or more data frames. Other aspects indicate how bidirectional single receiver aggregate data flow should be used in infrastructure, mesh and ad hoc operation scenarios.

Variable-length information-containing frames (e.g., MPDUs) are aggregated into a bitstream using frame delimiters to distinguish the frames. Aggregation and frame extraction techniques are provided that support recovery from bit errors that may be present in a frame delimiter. One class of techniques involves providing redundant length information in the frame delimiters, e.g., by using multiple copies of a length field or error correction codes usable to correct errors in the length field. The receiver can use the redundant information to detect and correct errors in the length field. Another receiver-side technique iteratively attempts to locate the end of the corresponding frame when a corrupt frame delimiter is detected. Conventional synchronization fields may be eliminated.

A method of the communication includes communicating at least one physical layer frame. The physical layer frame is formed by dynamically varying an aggregate packet size in response to a condition of a channel used for communicating voice and / or data. Here, the step of dynamically varying aggregate packet size may involve modifying a number of content frames to form the physical layer frame. The physical layer frame may correspond with a payload having at least two content frames and at least one IP header. Each content frame may include a voice frame and / or a data frame.

The invention relates to improve use of resource units in MU transmissions of an 802.1 1ax network. An un-associated station may receive data frames over a downlink resource unit, RU, assigned to an AID, e.g. 2045, reserved for stations not associated with the AP, The AP may use a downlink RU sharing an allocation scheme feature of an uplink RU previously used by the un-associated station. The AP may also aggregated data frames addressed to several stations within the same downlink RU, for instance to acknowledge frames previously received from the stations. The aggregated data frames may signal which respective response RUs the addressee stations should use for a next multi-user uplink transmission to respond to the AP. These approaches particularly applies to the exchange of management frames for instance to speed up the association procedure of un-associated stations.

Certain aspects of the present disclosure provide techniques and apparatus for using channel state information (CSI) feedback for multiuser multiple-input multiple-output (MU-MIMO) transmission. For certain aspects, a method of wireless communications generally includes generating a training frame and transmitting the generated training frame. The training frame typically includes first information identifying a group of one or more apparatuses and second information indicating whether each of the apparatuses in the group is to determine at least one characteristic of a channel. For other aspects, a method of wireless communications generally includes receiving a request at an apparatus and transmitting, in response to the received request, a packet using frame aggregation, wherein two or more frames are transmitted in a single transmission using a single header.

The invention directed to an efficient frame aggregation transmission scheme with network coding to improve transmission efficiency in 802.11n / ac networks. According to network conditions, the proposed scheme can dynamically utilizes either modified systematic network coding or mixed generation coding to efficiently transmit the aggregated frame.

Provided is a process including: obtaining source and destination video data, the destination video data being a transformed version of the source video data; for a plurality of blocks in the given source frame, determining a respective source aggregate value that is based on a measure of central tendency of pixel values; for a plurality of blocks in the given destination frame, determining a respective destination aggregate value that is based on a measure of central tendency of pixel values; determining a plurality of differences between source and destination aggregate values; determining a frame aggregate value that is based on a measure of central tendency of the determined differences; and determining a measure of distortion of the destination video data based on the frame aggregate value.

Methods and apparatus for improving the efficient use of a wireless channel. Flows of compatible packets to be transmitted are processed in separate queues based on characteristics of the packets, destination and quality of service (QoS) requirements. Aggregation parameters selected for each flow define when packets aggregated on a flow are to be sent. The aggregation parameters may reflect packet type, such as QoS requirements, an application type and / or wireless channel conditions. In some embodiments, the aggregation parameters indicate a threshold frame size or include a threshold time to buffer a packet while waiting for other packets on that flow to fill a frame. When an aggregation parameter for a queue is met, the aggregated packets are transmitted as a frame. The queue is cleared and subsequent packets may begin aggregating. Some types of packets, such as acknowledgment packets, may be sent without aggregation.

The invention discloses a data aggregation method based on a 6LoWPAN protocol stack. After an adaption layer input queue receives a data package output by a network layer, whether the data package is real-time data or not is judged according to the communication category in a header field, if yes, the data package is directly output to an adaption layer output queue; if no, the data package is processed in a data aggregation mode within time granularity T and then is output to the adaption layer output queue. Data aggregation processing is the fact that received data packages are classified according to the destination addresses in headers of the data packages and data aggregation is conducted according to the aggregation degree D and classification. According to the data aggregation method based on the 6LoWPAN protocol stack, the function of data aggregation is added, a dynamic data aggregation mechanism is achieved to reduce the data communication traffic between the network layer and an MAC layer, and the real-time performance of a network is improved.

The present invention relates to a method for constructing an aggregated frame for efficient wireless communication in a high-density environment and a wireless communication method using the same.For this, the present invention provides a wireless communication method including: generating an aggregated MPDU (A-MPDU) including a plurality of MAC protocol data unit (MPDU) groups to which independent modulation and coding schemes (MCSs) are applied, respectively; and transmitting the generated A-MPDU through the transceiver and a wireless communication terminal using the same.

The invention provides a transmission control protocol acknowledgement (TCP ACK) message processing method, a TCP ACK message processing device and wireless network equipment. The method comprises the following steps of: judging whether a continuous TCP ACK message exists in a message to be aggregated according to a head of the message to be aggregated; when the continuous TCP ACK message exists in the message to be aggregated, processing the continuous TCP ACK message according to a preset threshold value; and sending an obtained frame aggregation queue into a frame aggregation unit for frame aggregation. By the method, the TCP ACK message in the message to be aggregated is processed specially, and then frame aggregation operation is performed, so that resources which are occupied during frame aggregation of the TCP ACK message can be reduced, and the problem of shortage of wireless air interface resources is solved; particularly, a phenomenon that a cache queue is fully filled because of a TCP ACK attack can be avoided; the transmission quality of the TCP message is improved; the throughput of a wireless network is improved; and under the condition that the frame aggregation depth cannot be improved, the resource utilization rate of the wireless network can be effectively improved.

The invention discloses a data frame aggregation method with a fault-tolerant function. The method mainly solves the problem of poor fault-tolerant performance caused by irrational frame structures in the existing data frame aggregation mechanism. The implementation process of the method is as follows: a transmitting node aggregates data frames when aggregation conditions are satisfied; the transmitting node generates a sub-frame header, comprising an offset value domain and a length domain, for each sub-frame, and combines each sub-frame header into a first part of the load; the transmitting node orderly stores the each combined sub-frame header, a filling domain and each sub-frame to form the complete load; the transmitting node adds a header field and a tail field for the load, and then transmits the aggregated frames; and a receiving node executes disassembly operations after receiving the aggregated frames, reads corresponding sub-frames according to the offset valve domain and the length domain of each sub-frame header, and forwards the sub-frames to an upper layer. The method effectively improves the fault-tolerant performance of the data frame aggregation mechanism for transmission error codes while improving the channel transmission efficiency, so that the method can be widely used in various data communication networks.

The invention discloses a two-stage frame aggregation method which comprises the following steps that a media access control (MAC) level two-dimensional Markov chain model is established, and the free probability of a network, data sending successful probability and data collision probability in the network as well as the length of an MAC level time slot which corresponds to the state of the network are obtained; the length Lth of an A-MSDU frame which enables the saturation throughput S of the network to be the highest is obtained; the upper limit Llimit of the length of the A-MSDU frame which meets a time delay requirement Dmax is obtained; the length Lth of the A-MSDU frame and the upper limit Llimit of the length of the A-MSDU frame (whichever is smaller) is selected as the length LA-MSDU of the final A-MSDU frame; and the A-MSDU frame is determined according to the length LA-MSDU of the A-MSDU frame, and two-stage frame aggregation is realized. The problems of throughput performance reduction and data time delay control are solved by automatically adjusting the length of the A-MSDU frame.

Variable-length information-containing frames (e.g., MPDUs) are aggregated into a bitstream using frame delimiters to distinguish the frames. Aggregation and frame extraction techniques are provided that support recovery from bit errors that may be present in a frame delimiter. One class of techniques involves providing redundant length information in the frame delimiters, e.g., by using multiple copies of a length field or error correction codes usable to correct errors in the length field. The receiver can use the redundant information to detect and correct errors in the length field. Another receiver-side technique iteratively attempts to locate the end of the corresponding frame when a corrupt frame delimiter is detected. Conventional synchronization fields may be eliminated.