56 results about "MAC service data unit" patented technology

A portable data terminal (PDT) adapted to participate in a wireless mesh network including a plurality of peer PDTs can comprise: a PDT module including an encoded information reading (EIR) device, and a mesh point (MP) module communicatively coupled to the PDT module. The MP module can include a microcontroller and at least one wireless communication interface and can be configured to perform IEEE 802.11-conformant wireless station services including authentication, de-authentication, privacy, and MAC service data unit delivery, and IEEE 802.11-conformant wireless distribution system services including association, disassociation, distribution, integration, and re-association. The MP module can be further configured, responsive to receiving a MAC frame addressed to a recipient inside the wireless mesh network, to deliver the MAC frame using the distribution service. The MP module can be further configured, responsive to receiving a MAC frame addressed to a recipient outside of the wireless mesh network, to deliver the MAC frame using the integration service. The MP module can be further configured to route an incoming MAC frame according to its destination address and the frame control field. The MP module can be further configured to cause the PDT module to exit said sleeping state responsive to receiving a mobile management software (MMS) wake-up command.

A method of providing an automatic repeat request (ARQ) that employs a selective repeat, enabling a transmitting medium access control (MAC) entity at a transmitting station to retransmit those MAC data whose previous transmissions have failed is described. The MAC data is organized into fixed-sized ARQ blocks, with said ARQ blocks being the building blocks of MAC service data units (MSDUs) or MSDU fragments; The transmitting MAC entity assigns a local number and a global number to each ARQ block to be transmitted and identifies ARQ blocks contained in a transmitted MAC protocol data unit (MPDU) by including into the MPDU the local and global numbers of the first ARQ block in that MPDU. A receiving MAC entity at a receiving station determines and acknowledges the reception status of the ARQ blocks received or anticipated.

A portable data terminal (PDT) adapted to participate in a wireless mesh network including a plurality of peer PDTs can comprise: a PDT module including an encoded information reading (EIR) device, and a mesh point (MP) module communicatively coupled to the PDT module. The MP module can include a microcontroller and at least one wireless communication interface and can be configured to perform IEEE 802.11-conformant wireless station services including authentication, de-authentication, privacy, and MAC service data unit delivery, and IEEE 802.11-conformant wireless distribution system services including association, disassociation, distribution, integration, and re-association. The MP module can be further configured, responsive to receiving a MAC frame addressed to a recipient inside the wireless mesh network, to deliver the MAC frame using the distribution service. The MP module can be further configured, responsive to receiving a MAC frame addressed to a recipient outside of the wireless mesh network, to deliver the MAC frame using the integration service. The MP module can be further configured to route an incoming MAC frame according to its destination address and the frame control field. The MP module can be further configured to cause the PDT module to exit said sleeping state responsive to receiving a mobile management software (MMS) wake-up command.

A conventional packet frame includes a MAC header, one MAC service data unit (MSDU) and a frame FCS. This frame is repeated to send a plurality of MSDUs. A proposed packet frame includes a MAC header, a plurality of MSDUs and a frame FCS. A unique bit pattern is provided in the MAC header to distinguish the proposed packet frame from the conventional packet frame. Thus, the total data stream can be shortened.

The invention discloses a wireless relay system and the data transmission method thereof, which belong to the filed of wireless communication. The method of the invention includes the steps: first, a media access control layer (MAC) entity of a wireless relay station receives an MAC protocol data unit to be sent to a user terminal or a base station for the base station or the user terminal; then the MAC entity of the wireless relay station defines the length of the MAC protocol data unit which can be sent at present, analyzes the MAC protocol data unit which cannot be transmitted to the destination user terminal or the base station once and takes out the MAC protocol data unit to cache; finally, when the MAC entity of the wireless relay station sends the cached data, one or a plurality of MAC service data unit(s) is / are taken out to compose the MAC protocol data unit which conforms to the length requirement, and then the MAC protocol data unit is sent to the MAC entity of the destination user terminal or the base station. The invention also provides the wireless relay system, improves the success ratio for data transmission between BS and UT and the utilization ratio of wireless resources.

A method and apparatus for processes a downlink frame within a Medium Access Control (MAC) layer (348) where the downlink frame includes a plurality of fragments constituting one or more MAC Service Data Unit (MSDU)s. The MAC layer pre-processes the plurality of fragments of the downlink frame by reordering the fragments to reassemble one or more of the MSDUs (910) until an end-of-frame signal is detected (912). The end-of-frame signal indicates that all of the plurality of fragments for a downlink frame have been received. The MAC layer post-processes the plurality of fragments (916) in response to detecting the end-of-frame signal (912), then delivers the reassembled MSDUs to a next layer (918).

Provided is an enhanced communication apparatus. The enhanced communication apparatus may enable a Packet Data Convergence Protocol (PDCP) layer unit to perform a part of a concatenation function, a segmentation function, and a reassembly function of a Radio Link Control (RLC) layer unit that is a sublayer of Layer 2, and may decrease a number of Packet Data Convergence Protocol Packet Data Units (PDCP PDUs) to be processed by the RLC layer unit.

An apparatus and method for generating a Media Access Control (MAC) Protocol Data Unit (MPDU) in a wireless communication system are provided. The method includes reconstructing at least one MAC Service Data Unit (MSDU) according to scheduling information of the MAC layer and generating at least one MPDU data portion, adding control information to each MPDU data portion and generating at least one MPDU payload, adding a General MAC Header (GMH) to each MPDU payload and generating at least one MPDU, and transmitting the MPDU to a receive end. The control information includes at least one piece of MSDU information constituting each MPDU data portion. The GMH includes length information on the MPDU and Connection IDentifier (CID) information.

A device and method for transmitting data over a wireless network, based on a low latency interconnect bus protocol. The low latency interconnect bus protocol is a layered protocol containing a Wireless Medium Access Control (WMAC) layer for constructing a WMAC frame from the data, and a Wireless Physical (WPHY) layer for constructing a WPHY frame from the WMAC frame. The WMAC frame includes an aggregation of a plurality of MAC Service Data Units (MSDUs), and is capable of providing a reliable link by implementing an implied ACK and a block ACK. The WPHY frame is configured to provide a mechanism for a bi-directional communication between components; and the content of the WPHY frame is determined according to a communication state between two communicating components.

A device and a method for transmitting a MAC service data unit (MSDU) in a network system are disclosed. The MSDU has a plurality of pieces of frame data. The method includes receiving the pieces of frame data of the MSDU; and when finishing receiving each piece of frame data, even if not all of the pieces of frame data of the MSDU have been received, converting the received piece of frame data into a MAC protocol data unit (MPDU) and outputting the MPDU.

A superframe, method and system for transmission of an aggregation of packets at multiple rates includes a header (300) comprising a preamble (305) and a PHY layer convergence protocol (310), a plurality of MAC management protocol data units (205), a beacon; and a super protocol service data unit header (315). A plurality of multi-rate aggregated packets (327) is grouped together in the superframe to provide power savings for the receiving nodes that can receive the packets in a reduced number of transmissions. Grouping the packets according to the MAC destinations also provides for shortening reception times by the nodes, resulting in power savings. The superframe permits the MAC service data units to be delivered to each of the nodes, resulting in power savings. The superframe permits the MAC service data units to be delivered to each of the nodes at different PHY rates to maximize efficiency.

A transmission entity (e.g., user equipment (UE)) is expected to reduce the segmentation of Radio Link Control (RLC) Service Data Units (SDUs) while also minimizing padding. Signaling or provisioning of a constraint value such as a maximum padding amount or minimum segmentation size is employed in a determinative way in the UE to balance these objectives. A receiving entity (e.g., evolved base node (eNB)) benefits from being able to signal these parameters, whose application to RLC instances can discriminate between data and signaling radio bearers. Compliance can also be voluntary, such as the network entity employing at least a portion of the same approach on the downlink.

An apparatus and method for avoiding waste of resources by dynamically allocating a length of a Logical Channel IDentification (LCID) of a header included in a Media Access Control (MAC) Protocol Data Unit (PDU) are provided. The apparatus includes a header generator for evaluating a MAC Service Data Unit (SDU) to be multiplexed and for dynamically allocating LCID information according to the evaluated MAC SDU, when radio bearer information is modified. Accordingly, the conventional problem can be solved in which a large number of bits are unnecessarily wasted since the length of the LCID is fixedly allocated or in which logical channels cannot be sufficiently used.

The invention provides a receiving state indication method for A-MPDUs (Aggregate-Management Protocol Data Units) and a receiving end device and is used for indicating receiving states of the A-MPDUs containing MSDU (MAC Service Data Unit) fragments. The method provided by the invention comprises the steps that a receiving end receives the A-MPDUs sent by a sending end; when it is determined that at least one MPDU (Management Protocol Data Unit) in the A-MPDUs is formed by packaging the fragments of MSDUs, the receiving end sends acknowledgement for indicating the receiving states of the A-MPDUs to the sending end, wherein the acknowledgement comprises a fragment indication field and a receiving state field, the fragment indication field is used for indicating that the MPDUs formed by packaging the fragments of the MSDUs are contained in the A-MPDUs, the receiving state field is used for indicating the receiving state of each MPDU in the A-MPDU, and the set digit of bits in the receiving state field are used for indicating the receiving states of the MPDUs which have the same sequence numbers.

The invention discloses a transmission method for a relay link. The method comprises the following step of: after packaging a relay MAC (Medium Access Control) control element (R-MAC CE) to be transmitted between an evolved node B (eNB) and a relay node (RN) and an MAC service data unit (MAC SDU) attributed to all nodes in an effective load of the R-MAC protocol data unit (R-MAC PDU), transmitting the R-MAC PDU on a return link between the eNB and the RN. The invention also discloses a transmission device and a receiving device for the relay link. In the transmission device, a packaging unit is used for packaging the R-MAC CE to be transmitted between the eNB and the RN and the MAC SDU attributed to all the nodes in the effective load of the R-MAC PDU and transmitting the R-MAC PDU to a transmission unit. By adopting the method and the device of the invention, the transmission performance on the relay link can be improved.

Systems and methodologies are described that facilitate signaling and / or utilizing uplink delay budget related feedback in a wireless communication environment. A lowest delay budget associated with a most urgent Radio Link Control (RLC) service data unit (SDU) retained in a buffer of an access terminal can be determined. Further, a portion of a Medium Access Control (MAC) header (e.g., two reserved bits, ) can be configured to carry a code related to a delay threshold corresponding to the lowest delay budget. Moreover, the MAC header can be transferred to a base station. The base station can detect the code carried by the portion of the MAC header, and a delay threshold can be determined as a function of the detected code (e.g., utilizing a radio bearer specific mapping). According to an example, the access terminal can be scheduled for uplink transmission as a function of the delay threshold.

A device and a method for transmitting a MAC service data unit (MSDU) in a network system are disclosed. The MSDU has a plurality of pieces of frame data. The method includes receiving the pieces of frame data of the MSDU; and when finishing receiving each piece of frame data, even if not all of the pieces of frame data of the MSDU have been received, converting the received piece of frame data into a MAC protocol data unit (MPDU) and outputting the MPDU.

Disclosed are a dimming method and a dimming device. The dimming method includes dividing an MSDU (Mac service data units) on an MAC (media access control) layer into two or more than two sub MSDU of the same length; packaging the divided sub MSDU into individual MPDU (Mac protocol data units) and generating compensation frames for the MPDU respectively; aggregating the MPDU and the compensation frames which are of the same address as a PSDU (presentation service data) part of a PPDU (physical protocol data unit) and transmitting physical frames. The dimming method is independent of a modulation method and channel encoding scheme utilized in data transmission and accordingly realizes flexible and precise dimming of a visible light communication. Besides, since the MAC frame aggregation technology is utilized to realize intra-frame dimming, cost is saved.

The invention discloses a method for configuring a Packet Data Unit (PDU) in a Media Access Control (MAC) layer. The method comprises the following steps of: configuring effective load of MAC PDU and an MAC sub-head corresponding to the effective load, wherein the effective load comprises an MAC Control Element (CE) and / or an MAC Service Data Unit (SDU); judging whether the effective load of the MAC PDU is only configured with the MAC CE and the MAC PDU needs filling of 1 byte, if so, configuring a filling sub-head behind a last MAC CE sub-head and adjacent to the last MAC CE sub-head; otherwise performing an MAC PDU configuring process in the prior art. The invention also discloses another method for configuring the MAC PDU and a device for configuring the MAC PDU. The scheme of the invention avoids the inconsistency of a configuring position of the filling sub-head under different conditions in the existing specification.

In an IEEE 802.11bc wireless system, aggregated data frames are communicated between first and second STA devices by configuring the first STA device to assemble and transmit an A-MPDU frame having multiple A-MPDU subframes characterized by a fixed MPDU start spacing parameter and a fixed maximal MPDU length parameter, where the first STA device is configured with the fixed MPDU start spacing parameter and the fixed maximal MPDU length parameter without negotiating association request and response messages, and by configuring the second STA device to assemble and transmit a BA message comprising a BA bitmap identifying the one or more of the multiple A-MPDU subframes which are not successfully received by the second STA device, where the BA bitmap has a size characterized by a fixed buffer size parameter which is configured at the second STA device without negotiating add BA request (ADDBA Request) request and response messages.

A data transmission method applied to the data transmission service of the Acknowledged Mode (AM) is provided. The method comprises: after initiating the Move Receiving Window (MRW) process according to the discarding mode of a service data unit (SDU), the Radio Link Control (RLC) entity of a sending terminal sends a status packet with the Move Receiving Window Super Field (MRW SUFI) and constructs a temporary sending window; and before receiving the Move Receiving Window Acknowledgement (MRW ACK) sent by the RLC entity of a receiving terminal, the RLC entity of the sending terminal sends the Acknowledged Mode Data Protocol Data Unit (AMD PDU) existing in the temporary sending window. A data transmission system is also provided. It can make greater use of the bandwidth during the MRW process by employing the present technical solutions, so as to improve the sending rate without influencing the normal transmission of the MRW process.

The invention provides an MAC protocol data unit for TD-LTE. The MAC protocol data unit comprises an MAC head, an MAC service data unit and an MAC control unit, wherein the MAC head comprises a plurality of MAC sub-heads; in the plurality of MAC sub-heads, each of the other MAC sub-heads except the last MAC sub-head comprises 6 head fields R / R / E / LCID / F / L; an extension field E1 of 1bit is arranged behind the head field F of each MAC sub-head; if the extension fields E1 are set to be 1, at least another group of fields F / E1 / LI is arranged behind each of the extension fields E1; and if the extension fields E1 are set to be 0, an MAC service data unit is behind a byte behind each of the extension fields E1. The MAC protocol data unit for TD-LTE can be used for extending state PDU sub-heads under an RLC AM mode so as to achieve the maximization of resource utilization.

The invention discloses a method for transmitting a logical channel identification in multimedia broadcast and multicast service (MBMS). The method comprises the following steps: an evolution node (eNB) indicates a wireless frame or wireless sub-frame carrying a MBMS control channel (MCCH) to user equipment (UE) through a system broadcast message; and the UE reads the content of a media access control (MAC) head from the wireless frame or wireless sub-frame, identifies the logical channel type according to the content of the MAC head, and reads data from a MAC service data unit (SDU). The invention also discloses a logical channel identification transmission system in MBMS. Adoption of the method and the system realizes that the UE can accurately identify the logical channel type under the condition that a plurality of different types of MBMS logical channels are multiplexed on an MAC protocol data unit (PDU).

The invention provides a reception processing method for a wireless aggregation frame. The method comprises the following steps of: sequentially processing protocols of all media access control (MAC) protocol data unit (MPDU) frames which are received by a reception device at present by using a protocol reception processing unit; removing packages of all the processed MPDU frames sequentially; performing corresponding different operation processes according to different load frames of which the packages are removed in the process of removing the package of each MPDU frame; if the current load frames are aggregation frames, storing the aggregation frames into the current usable free buffer zone, and calculating the quantity of MAC service data unit (MSDU) frames in the aggregation frames to apply for buffer zone spaces with the same quantity as that of the MSDU frames; if the buffer zone is null before the aggregation frames are stored into the buffer zone, establishing the protocol reception processing unit, and starting direct memory access (DMA) transmission affairs to copy the MSDU frames in the aggregation frames into the applied buffer zone spaces; and after depolymerization completion messages are received, processing the polymerized MSDU frames in the buffer zone by using an upper user sequentially through the protocol reception processing unit, establishing the aggregation frames required to be aggregated in the buffer zone, and starting the DMA transmission affairs. By the method, the MSDU frames in the aggregation frames can be copied by a hardware DMA controller under the condition that MAC hardware cannot be aggregated, so that the reception processing efficiency of the aggregation frames is improved.

Disclosed are a device for transmitting a data unit and a method of operating the same. More particularly, the device of the present disclosure includes a size determination unit for determining an optimal split size for a MAC Service Data Unit (MSDU) received from an upper layer by applying a transmission time algorithm; a unit division unit for splitting the MSDU into the determined size; and a MAC layer management unit for generating plural MAC Protocol Data Units (MPDUs) based on the split plural MSDUs and the delimiter for each of the split plural MSDUs, generating an aggregate protocol data unit by applying an aggregate transmission scheme to the generated MPDUs, and delivering the generated aggregate protocol data unit to a physical layer, thus guaranteeing reliability important for video streaming and, at the same time, increasing the throughput.