594 results about "PDCP" patented technology

The embodiments of the invention disclose a method and apparatus for signaling interaction and layer reconstruction in a switching process, and relate to the field of radio communications. The method and apparatus are used for ensuring a normal data transmission process after a terminal is switched after the length of the serial number (SN) of a packet data convergence protocol (PDCP) is expanded. In the method, a source base station, according to whether the acknowledged mode (AM) bearer of the terminal is configured by the source base station and a target base station with the PDCP SN of a long term evolution (LTE) system or an expanded PDCP SN, generates an SN state transmission signaling and a forwarding data packet; a target base station, according to whether the AM bearer of the terminal is configured by the source base station and the target base station with the PDCP SN of the long term evolution (LTE) system or the expanded PDCP SN, analyzing the received SN state transmission signaling and forwarding data packet so as to ensure that the normal data transmission process can be carried out after the terminal is switched.

Provided is an apparatus and method for transmitting/receiving a ciphered packet in a mobile communication system. The apparatus and method perform a reset of a Packet Data Convergence Protocol (PDCP) in connection with transmission/reception of a ciphered packet including a compressed header, thereby preventing packet loss from occurring, and minimizing waste of limited transmission resources.

The invention provides a method for a main base station in a dual-connectivity system. The method comprises the following steps of receiving an indication to an S-RLF, a trigger reason and a measuring report of the S-RLF from user equipment UE in case of a radio link failure of a supplementary base station (the S-RLF); determining operations on the supplementary base station on the basis of the indication, the trigger reason and the measuring report; and informing the UE of the determined operations on the supplementary base station. The invention further provides a method for the user equipment in the dual-connectivity system, the related main base station and user equipment. The invention further provides an optimized solution scheme for a UE operation process in the dual-connectivity system when the S-RLF is detected. The scheme includes a process of MAC/RLC/PDCP layers, signals between the UE and the main base station and signals between the main base station and the supplementary base station. In this way, the UE behavior is clearly defined and optimized. The dual-connectivity system is thus enabled to work with higher efficiency in case of an S-RLF condition.

The invention discloses a method of data processing in the switching process, applying to the wireless evolution network. After the source base station sends switching order to the target base station and receives the message of permission, the source base station transfers the data to the target station, which includes all PDCP data packets buffer queue corresponding to the current user equipment and the follow-up received data accessing gateway to send to user equipment for switching. The described PDCP packet buffer queue includes the packaged ARQ data and PDCP data packets without the confirmation. The target base station reserves the data transmitted by the source one into itself PDCP data packet. The invention also discloses a kind of base station equipment.

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 present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A control method of a user equipment (UE) in a wireless communication system is provided. The method includes receiving packet data conversion protocol (PDCP) configuration information including information indicative of whether a PDCP layer supports out-of-sequence delivery; identifying whether the PDCP layer supports out-of-sequence delivery based on the PDCP configuration information; and processing a PDCP packet data unit (PDU) based on a result of identifying whether the PDCP layer supports out-of-sequence delivery.

An apparatus and method for performing procedures (protocols) of a PDCP (Packet Data Convergence Protocol) layer and an RLC (Radio layer in an E-UMTS (Evolved Universal Mobile Telecommunications System) which has evolved from UMTS, among radio protocols of a mobile communication system. The PDCP layer performs ciphering on data (i.e., PDCP SDU) received from an upper layer, generates an indicator discriminating ciphered data and non-ciphered data (i.e., an ROHC feedback packet directly generated by the PDCP layer), and transmits the same to a lower layer (i.e., MAC layer). A PDCP SN (Sequence Number) is defined as an algorithm for ciphering the data in the PDCP layer to perform ciphering in the PDCP layer.

During path switching between sidelink (SL) and uplink (UL) for vehicle-to-everything (V2X) message transmission, a path switching layer of a user equipment (UE), which may be located right above a packet data convergence protocol (PDCP) layer of the UE, stores a vehicle-to-everything (V2X) message, which is not transmitted yet on an old path, in a transmission buffer. And then, the path switching layer of the UE re-submits the V2X message stored in the transmission buffer to a lower layer of a new path.

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.

A method and apparatus for performing backoff in a wireless communication system is provided. A user equipment (UE) identifies a prioritized access, receives a backoff parameter from a network, and determines whether or not to apply the received backoff parameter according to the prioritized access. The prioritized access corresponds to one of emergency access, high priority access, control element/information in media access control (MAC), radio link control (RLC) or packet data convergence protocol (PDCP), data radio bearer (DRB) for voice/video service, signaling radio bearer (SRB) 0, SRB 1, SRB 2, multimedia telephony service (MMTEL)-voice, MMTEL-video, and voice over long-term evolution (VoLTE).

A method for refreshing a key is provided, wherein when a counter in a PDCP layer of a RB reaches a threshold, a mobile device receives a cell handover message, re-establishes PDCP layers and RLC layers for all RBs, keeps Uplink Time Alignment Information, uplink grant resources for uplink shared channel and Physical Uplink Control Channel resources allocated semi-statically, and flushes a buffer of a MAC layer; the mobile device obtains a new root key, and obtains a new encryption and integrity protection key of a radio resource control plane according to the new root key; the mobile device transmits a cell handover complete message protected by the new encryption and integrity protection key.

In the present invention, if a transmitting device receives an activation command for a packet duplication function of a PDCP entity for a radio bearer (RB), the PDCP entity submits a PDCP protocol data unit (PDU) to each of multiple lower layer entities associated with the PDCP entity, and each of the multiple lower layer entities transmits the PDCP PDU. If the transmitting device receives a deactivation command for the packet duplication function, the PDCP entity submits the PDCP PDU to a single one of the multiple lower layer entities, and the single one of the multiple lower layer entities transmits the PDCP PDU.

The invention discloses a method for data distribution in a LTE-A system, which comprises that: an RLC layers of network nodes receive a plurality of RLC SDUs transmitted by PDCP layers, wherein the RLC SDUs comprise communication data of at least one communication opposite terminal; and the RLC layers distribute the plurality of received RLC SDUs to carriers according to preset scheduling policies and transmit plurality of distributed RLC SDUs to the communication opposite terminals through protocol layers below the layer. Thus, compared with the LTE system, the LTE-A system has the advantages of avoiding the change of the protocol design and equipment of the protocol layers below the RLC layers of the network nodes and consequently saving research and development cost to a great extent. In addition, the invention also discloses a communication device and the LTE-A system.

The embodiment of the invention provides a method and device for decompressing and compressing uplink data. The method for decompressing the uplink data comprises the following steps: a decompression end detects an uplink data compression (UDC) head in a packet data convergence protocol (PDCP) packet after receiving the PDCP packet, wherein the UDC head at least contains compressed context information of a data packet in the PDCP packet and the information related to a decompression cache area, and the information related to the decompression cache area indicates the decompression end to control the decompression cache area of the decompression end to be consistent with a compression cache area of a compression end; and the decompression end performs corresponding operations for the data packet in the PDCP packet according to the compressed context information and the information related to the decompression cache area. According to the method and device provided by the invention, the consistency between the compression cache area of the compression end and the decompression cache area of the decompression end can be guaranteed, and thus the reliability of uplink data compression can be ensured.

The present invention provides a data transmission method and apparatus. The data transmission method is used for a terminal, and includes the steps: receiving a first indication message sent from a base station, wherein the first indication message includes first information which is used to represent a packet data convergence protocol PDCP packet replication function and at least two transmission entities, configured for a radio bearer RB by the base station; according to the first indication message, setting the transmission function corresponding to the RB as the PDCP packet replication function; according to the at least two transmission entities in the first indication message, setting a transmission entity corresponding to the RB; setting a current state of the PDCP packet replication function, wherein the current state includes an activated state and an inactivated state; and according to the current state, performing corresponding data transmission with the transmission. Therefore, the data transmission method can implement data transmission for the PDCP packet replication function, and can improve the reliability of data transmission.

A method for keeping PDCP serial number synchronizing is used for RLC works in drop mode. It contains when transmitting side RLC checks drop process, transmitting dropped SDU serial number to receiving side RLC and receiving return response message, receiving side RLC according to said SDU serial number information to determine practical dropped SDU total number and transmitting to receiving side PDCP, receiving side PDCP directly increasing said number to current PDCP serial number. Said SDU serial number information includes each to be dropped SDU serial number information current dropped process, said serial number information is each SDU last section corresponded RLC PDU serial number and transmitted through display drop signalling. Said invented method supports non destructive migration in RLC working in drop mode.

The invention provides a method, a system and a device for configuring wireless link control layer series number (RLC SN), which include the following steps: determining the type for distributing RLC S is independent RLC SN or reusing group data convergence-level series number (PDCP SN), configuring the RLC entity of the sending terminal and the RLC entity of the receiving terminal according to the determined type of RLC SN. This type of determination of RLC SN distribution mode according to QoS parameter, instead of using fixed RLC SN distribution mode, can realize flexible configuration of RLC SN distribution mode, which has sufficiently developed the advantages of independent RLC SN mode and reused PDCP SN mode.

A method and device for indicating data re-transmission when area switching in LTE system, wherein the method comprises the following steps: S_eNB sends PDCP-SDU CN report to T_eNB in order to announce PDCP-SDU SN received, and T_eNB announces PDCP-SDU SN received by S_eNB to UE. Thereby, UE would not re-transmit PDCP-SDU corresponding to received SN, which avoids re-transmission of useless PDCP-SDU, and saves radio resources comparing with prior solutions.

A Long Term Evolution (LTE) base station equipment and a method for processing data service in the LTE base station equipment are provided in the present invention embodiment. The method for processing the data service in the LTE base station of the present invention embodiment includes that: at least one cache queue is set in the Packet Data Convergence Protocol (PDCP) entity of the LTE base station for caching the downlink data of at least one data service transmitted by one bearer, and each cache queue has respective priority; after said bearer is established, when PDCP entity transmits data to a Radio Link Control (RLC) entity in the LTE base station by request, the PDCP entity transmits the data in each cache queue to the RLC entity according to the priority of at least one cache queue. According to the embodiment of the present invention, the differentiation of the service Quality of Service (QoS) can be realized in the LTE base station.

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.