56 results about "MAC service data unit" patented technology

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.

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.

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.

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 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 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.