608 results about "PDCP" patented technology

The present disclosure mainly relates to improvements for the buffer status reporting and the logical channel prioritization procedures performed in the UE, in scenarios where the UE is in dual connectivity and the PDCP layer of the UE is shared in the uplink for MeNB and SeNB. According to the present disclosure, a ratio is introduced according to which the buffer values for the PDCP are split in the UE between the SeNB and the MeNB according to said ratio.

The invention relates to a method for efficiently performing a Se NB change for a UE in dual connectivity. When reconfiguring a data radio bearer going via the Se NB to another target base station, the UE may compile a PDCP status report comprising status information for all of the data radio bearer going via the Se NB, accompanied respectively by a radio bearer ID to identify the radio bearer to which the status report information pertains. Further, the PDCP status report is directly transmitted by the UE to the Me NB to avoid the backhaul delay between the Se NB and the Me NB; this may be done by using a signaling radio bearer (e.g. RRC message), or data radio bearer to the Me NB (e.g. PDCP control PDU), or by using a physical channel transmission to the Me NB (e.g. MAC CE).

A method and system for providing Voice over Internet Protocol (VoIP) in a wireless communications system using a Packet Data Conversion Protocol (PDCP) with enhanced functionality that allows sub-packets to be processed for transmission over different Radio Bearers (RB) with unequal or different levels of error protection and / or error detection based on perceptual importance of the bits in the sub-packets. The enhanced PDCP being operable to partition a packet into a plurality of sub-packets such that different levels of error protection and / or error detection may be applied to the packet. An overall gain in system capacity can be expected due to transmit power savings provided via unequal error detection and error protection.

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.

A method used in an E-UTRAN for synchronizing PDCP operations after a RRC connection re-establishment procedure with a user equipment (UE) is provided. The method includes: initiating an RRC reconfiguration procedure to resume all radio bearers other than a signaling radio bearer 1 (SRB1) when an RRC connection is re-established; re-transmitting a designated group of PDCP Service Data Units (SDUs) to the UE when a data radio bearer (DRB) mapped on Radio Link Control (RLC) Acknowledged Mode (AM) is resumed.

The embodiment of the invention relates to a method, a device and a system for transmitting packet data convergence protocol (PDCP) data in the field of communication. The method comprises the following steps of: transmitting data by a PDCP entity of a transmitting party under a radio link control assurance mode (RLCAM); and updating a sequence number corresponding to the next datum to be transmitted, and making a model subtraction difference between the sequence number corresponding to the next updated data to be transmitted and a sequence number corresponding to the next datum be confirmed less than or equal to the size of a resequencing window of a receiving part, namely a PDCP receiving entity. By controlling the data transmission speed of the PDCP transmitting entity by the embodiment, the relevant state variables of the PDCP transmitting party and the PDCP receiving party can be updated synchronously so as to guarantee the reliability of data transmission.

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.

A method and apparatus of releasing a radio bearer in a wireless communication system is provided. After determining to release a radio link control (RLC) entity and a packet data convergence protocol (PDCP) entity, the RLC entity is released after delivering an RLC service data unit (SDU) extracted according to a release request of the RLC entity to the PDCP entity. A first PDCP SDU obtained by processing the RLC SDU is stored in a reception buffer at the PDCP entity. The PDCP entity is released after delivering the first PDCP SDU stored in the reception buffer to a higher layer.

Disclosed are an execution method of a Packet Data Convergence Protocol (PDCP) entity and a corresponding entity apparatus. The method includes: mapping a PDCP Protocol Data Unit (PDCP PDU) which is received from a lower entity of a PCDP entity and arrives in disorder onto a PDCP Service Data Unit (PDCP SDU) and storing PDCP SDU in a reorder buffer; judging whether the serial number of a missing PDCP SDU is smaller than the smaller one of the biggest serial number of the PDCP SDUs respectively received from two lower entities by the PDCP entity; and if the serial number of the missing PDCP SDU is smaller than the smaller one, delivering to a higher layer entity of the PDCP entity the PDCP SDU stored in the reorder buffer with the serial number smaller than the serial number of the missing PDCP SDU, and the PDCP SDU with the serial number bigger than the serial number of the missing PDCP SDU and continuous with the missing PDCP SDU.

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.

A system for creating logical RLC and MAC PDUs in a mobile communication system includes first and second remote network entities that communicate using the LTE link-layer protocol. The first and second remote network entities include first and second layer-2 protocol stacks, respectively. The first layer-2 protocol stack includes first PDCP, RLC and MAC sub-layers and the second layer-2 protocol stack includes second PDCP, RLC and MAC sub-layers. During transmission of data from the first remote network entity to the second remote network entity, the logical RLC and MAC PDUs are created by the first RLC and MAC sub-layers by populating logical RLC and MAC PDU structures.

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.

The invention provides a switching method and device and a data processing method and device. The switching method comprises following steps: a source base station sends a switching request to a target base station, wherein the switching request carries an uplink serial number and / or a downlink serial number of a PDCP, and the source base station and the target base station are different in a wireless access technology; a confirm message towards the request of the target base station is received by the source base station, then a data corresponding to the uplink serial number and / or the downlink serial number of the PDCP is sent to the target base station; and the source base station switches a UE to the target base station. A problem of a loss of the data caused by differences of criteria of different wireless access technologies when the switching is conducted between different wireless access technologies is solved so as to ensure that the loss of the data does not occur during the switching and improve a network communication quality.

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 offering a packet data service during to a handover of a user terminal from one radio network controller to another. To avoid the loss of data during SRNS relocation, there is provided a method for checking the validity of the next expected receive PDCP sequence number sent from a receiver PDCP layer with the send PDCP sequence number of the first transmitted but not yet acknowledged PDCP SDU and the send PDCP sequence number first unsent PDCP SDU of the sender PDCP layer. A PDCP protocol structure is reconstructed to support a lossless SRNS relocation in the packet service domain, and control information and operational procedure therefore are newly defined. As a result, the lossless SRNS relocation is achieved in the packet service domain and the mobility of data communication is ensured.