471 results about "Service data unit" patented technology

A method and apparatus are provided for reducing excessive retransmission delays which may occur due to the loss of the last packet of a transmission buffer in a Radio Link Control (RLC) layer of a mobile communication system. The method includes receiving a Service Data Unit (SDU) from a higher layer, dividing the SDU into a plurality of Packet Data Units (PDUs), and storing the PDUs in a buffer, setting a poll bit for a last PDU from among the PDUs stored in the buffer, the poll bit requesting a status report, and repeatedly transmitting the last PDU having the setup poll bit at least twice from a sender to a receiver, regardless of whether there is a request for retransmission of the last PDU.

A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU.

A radio link control (RLC) layer provides RLC entity information to a medium access control (MAC) layer. The RLC entity information indicates that the RLC layer has service data unit (SDU) data to be transmitted. After providing the RLC entity information, the RLC layer receives an unexpected data interruption that requires the RLC layer to discard or interrupt transmitting the SDU data. After the unexpected data interruption, the MAC layer requests at least a protocol data unit (PDU) from the RLC layer in response to the RLC entity information. The RLC layer then submits to the MAC layer at least one padding PDU in response to the MAC request. The padding PDU is submitted in place of the discarded SDU data. Alternatively, the affected SDU data is not discarded until the next transmission time interval (TTI).

A method for processing a received communication which includes periodic transmissions of a set of information segments. A first transmission of the set of information segments is received and processed to identify each of the segments as valid or invalid. The valid segments of the first set are then stored. Where all segments of the set are not stored, subsequent transmissions of the set of information segments are received and only those segments not previously stored are processed to identify each such segment as valid or invalid. The valid segments so identified are then stored. Subsequent transmissions are repeatedly received unless all segments of the set have been stored.

The invention relates to a method for transmitting data via a protocol sublayer of the mobile node during e.g. a handover that comprises the re-establishment of the protocol sublayer. The mobile node anticipates the handover, and has therefore more time to empty its transmission buffer of the protocol sublayer. Also, the segmentation of service data units (SDUs) into protocol data units (PDUs) is halted upon detecting the upcoming handover. The remaining unacknowledged PDUs in the buffer are then re-transmitted to the source base station such that the source base station can reassemble the corresponding SDUs. Also, the UE may prioritize the re-transmission of the unacknowledged PDUs depending on the priorities of the respective radio bearers. Therefore, after performing the handover to the target base station, the previously transmitted PDUs do not have to be transmitted again, as would be the case when no retransmission of unacknowledged PDUs takes place.

A buffering apparatus and method for packet aggregation are provided. A buffer buffers packet data to be transmitted on a frame basis. An aggregator represents the positions of the buffered packet data in an Access Category (AC) bitmap and a Traffic Identifier (TID) bitmap according to an AC and a TID of the buffered packet data, and provides a bitmap indicating the positions of packet data to be aggregated according to an aggregation condition to an aggregation controller. The aggregation controller aggregates the packet data based on the bitmap received from the aggregator, constructs an aggregation Physical Service Data Unit (PSDU) with the aggregated packet data, and transmits the aggregation PSDU to a destination.

A method of data segmentation in a transmitter of a mobile communications system includes initiating alternate extension bit interpretation, a last data segment of a Service Data Unit exactly ending at an end of a Protocol Data Unit, no Length Indicator in the Protocol Data Unit indicating the end of the Service Data Unit, a length of a next Service Data Unit following the Service Data Unit exactly equaling to a length of a data field of a next Protocol Data Unit following the Protocol Data Unit, and setting a first extension bit of the next Protocol Data Unit to be a specified value for indicating that the next Protocol Data Unit comprises a complete Service Data Unit, which is not segmented, concatenated or padded, and indicating that a Service Data Unit exactly ended in the Protocol Data Unit.

An apparatus and a method for flow control between a Packet Data Convergence Protocol (PDCP) layer and a Radio Link Control (RLC) layer in a communication system are provided. The method includes storing Service Data Units (SDUs) to be transferred to the RLC layer, receiving information on a capacity that is currently unused in a buffer of the RLC layer from the RLC layer, and generating Packet Data Units (PDUs) from SDUs, a capacity of which corresponds to the information, among packets stored in a buffer of the PDCP layer, and then transferring the generated PDUs to the RLC layer.

The invention discloses an automatic repeat request (ARQ) window management method which is characterized in that receiving terminals of layer entity are controlled by use of wireless links of confirmation mode; and when the sections of the wireless link control protocol data cell corresponding to the lower boundary of the currently-received window or all the wireless link control protocol data cells are not received successfully and the preset conditions are met, the receiving window are triggered to move continuously. The ARQ window management method overcomes the problems of wireless resource waste and unfairness when the service data unit (SDU) is discarded, and avoids the complexity of sending the move receiving window (Send MRW).

The present invention discloses a method for discarding service data unit. The invention is applied to the grouping data assemblage protocol layer service data unit of communication system wireless interface based on the timer, namely the PDCP SDU discarding. The method comprises the following step: when a discarding timer corresponding with the PDCP SDU is overtime, if the PDCP SDU is already transferred to a wireless link control layer and the wireless link control layer is distributed with a wireless link control layer sequence number, firstly triggering a polling procedure in a preset time or a preset time number. The invention prevents the phenomena of wireless resource wastage and unfairness caused by immediately discarding the SDU in the prior method.

To transmit service data in telecommunication systems with wireless telecommunication based on a predefined radio interface protocol between telecommunication devices, especially voice data and/or packet data in DECT systems, with enhanced utilization of the bandwith of the telecommunication system and at a greater transmission rate, service data units to be transmitted are transported by radio cascaded (a cascade arrangement) in protocol data units adapted to the radio interface protocol. The protocol data units in each case contain as many information fields; configured especially as length indicators for specifying the respective service data length; as there are service data units or fragments of service data units contained in the respective protocol data unit. In addition, each information field contains an extension (a reference) in the form of a concatenated list whether further service data units or further fragments of service data units follow in the respective protocol data unit.

The invention discloses data transmission methods and a data transmission device applied between a packet data convergence protocol (PDCP) entity and a radio link control (RLC) entity. In one method, after receiving a PDCP service data unit (SDU) from a high layer, the PDCP entity acquires a PDCP protocol data unit (PDU) which corresponds to the PDCP SDU, and then directly transmits the PDCP PDU to the RLC entity. In another method, a sending buffer area is arranged on a PDCP sub-layer; after receiving the PDCP SDU from the high layer, the PDCP entity stores the PDCP SDU in the sending buffer area of the PDCP sub-layer; and after receiving an RLC SDU request which is sent by the RLC entity, the PDCP entity transmits the PDCP PDU which corresponds to the PDCP SDU in the sending buffer area of the PDCP sub-layer to the RLC entity according to the RLC SDU request. By the invention, data transmission between the PDCP sub-layer and an RLC sub-layer is realized; and by defining the sending buffer area of the PDCP sub-layer, storing the PDCP SDU which is received from the high layer in the sending buffer area of the PDCP sub-layer by using the PDCP entity, and transmitting the PDCP PDU which corresponds to the PDCP SDU in the sending buffer area to the RLC entity, data packet interactive operation between the PDCP sub-layer and the RLC sub-layer is realized.

The invention discloses a buffer area state reporting method and a system, and a buffer area state reporting data quantity setting method. In the buffer area state reporting method, under the situation of meeting predetermined conditions, triggering a buffer area state report, and carrying the total data quantity determined by the following modes in a buffer area state report: determining a first data unit set; determining a second data unit set; and subtracting a data quantity sum of a protocol data unit in the second data unit set from a data quantity sum of a protocol data unit in the first data unit set, and using the subtraction result as the total data quantity, wherein the first data unit set comprises data capable of being sent by a packet data convergence protocol layer and a wireless link control layer; and the second data unit set comprises data discarded when a service data unit discarding timer is about overtime. The method can avoid waste of uplink bandwidth resources of a cell to a certain extent, and make uplink authorization assignment more accurate and reasonable.

The invention provides a data transmission method in a radio link control layer acknowledged mode, which comprises the following steps: establishing a logical channel message queue for a logical channel between a transmitting side and a receiving side; when the transmitting side transmits data through a first logical channel, transmitting the data after packeting and segmenting the data; after the receiving side receives the data packets, analyzing the data packets which pass through the valid detection, storing the data packets in the receiving cache queue or resegmenting queue of a second logical channel according to the analysis result, updating the parameters of a receive window, and submitting the data packets after the data packets satisfy the requirements; desegmenting and depacketing the data packets submitted by a submission queue, submitting the recombined integrated service data unit to an upper layer, constructing a status report, and transmitting the status report to the transmitting side; and after the transmitting side receives and analyzes the status report, processing the status report, and retransmitting the data when detecting loss or transmitting errors in the previously transmitted data packets according to the status report.

The invention discloses a data sending and processing method and data sending and processing equipment for a data link layer. The data sending and processing method for the data link layer comprises the following steps of: receiving a packet data unit of a packet data aggregation protocol layer; cascading a service data unit of a wireless link control layer and generating a corresponding length indication; after receiving a transmission format indication sent by a media access control layer, selecting the cascaded service data unit of the wireless link control layer according to the length indication in the transmission format indication to generate a load part of the packet data unit of the wireless link control layer, adding the length indication which corresponds to the selected service data unit of the wireless link control layer to a head, and forming the packet data unit of the wireless link control layer; and sending the formed packet data unit of the wireless link control layer. The data sending and processing method and the data sending and processing equipment for the data link layer can meet the requirement of high-speed service transmission, and also can meet the demands of high transmission speed and high processing complexity of a long-term evolution updating system.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for avoiding padding only MAC PDU in a D2D communication system, the method comprising: receiving a sidelink grant from a base station (BS) when the TX UE communicates with a receiving UE (RX UE) directly; checking size of the received sidelink grant; and transmitting a Medium Access Control Protocol Data Unit (MAC PDU) including at least one byte of Radio Link Control Service Data Unit (RLC SDU) if the size of received sidelink grant is larger than a minimum size of MAC PDU including only MAC header and Radio Link Control (RLC) header for Sidelink Traffic Channel (STCH).

The embodiment of the invention discloses a method, a system and a device for transmitting an MAC (media access control) PDU (protocol data unit). The method comprises that: an MAC layer at a transmitting end acquires an MAC SDU (service data unit) to be transmitted and generates MAC CE (control element); the MAC layer of the transmitting end assembles the MAC SDU and the MAC CE into the MAC PDU, wherein the MAC PDU carries attribution identifiers corresponding to the MAC SDU and the MAC CE; and the transmitting end transmits the MAC PDU to a receiving end, so that an MAC layer at the receiving end determines the attributions of the MAC SDU and the MAC CE according to the attribution identifiers corresponding to the MAC SDU and the MAC CE carried in the MAC PDU. Therefore, the data at each terminal is distinguished when the data of a plurality of terminals is multiplexed in the same MAC PDU, and the data is transmitted.

The invention discloses a data transferring method of the wireless chain circuit control layer, which comprises the following steps: a) the wireless chain circuit control layer receives the server data unit of the upper layer; b) the wireless chain circuit control layer quotes whether the received server data unit has the confirm information TCP ACK; c) the wireless chain circuit control layer first sends the protocol data unit which is corresponding to the server data unit of the confirm information TCP ACK. It provides a RLC data transferring method.

A method and apparatus for transmitting control information relating to an uplink packet data service from an UE to a Node B in a mobile communication system are provided. MAC-es protocol data units (PDUs) including uplink packet data and a control service data unit (SDU) including the control information are multiplexed and contained in a MAC-e PDU. In a header of the MAC-e PDU, a header part corresponding the control SDU contains a data description indicator (DDI) field set as a specific value representing that the control information is transmitted, and a header part corresponding to the MAC-es PDU contains a DDI field which represents a MAC-e flow and a logical channel relating to the uplink packet data, and a data size. Node B detects the control information from the control SDU based on the DDI field set as the specific value.

Disclosed are a method and a device for transmitting data in a wireless communication system supporting dual connectivity. The method for transmitting data in a wireless communication system supporting dual connectivity comprises the steps of: transmitting channel state information between a small base station and a terminal to a macro base station; receiving a radio resource control (RRC) connection reconfiguration message from the macro base station; releasing a connection with the small base station on the basis of the RRC connection reconfiguration message; and transmitting, to the macro base station, a PDCP state report including information on a sequence number of a packet data convergence protocol (PDCP) service data unit (SDU) which has not been received.