摘要:
Methods and devices are disclosed for forwarding data packets during handover in a packet-switched wireless communications system, such as a 3GPP Long-Term Evolution/System Architecture Evolution system. In an exemplary method, a source base station node (410, 900) determines (520) that handover of at least one radio bearer for a served user terminal (160) to a target base station node (430, 900) is imminent. The source base station node (410, 900) classifies (530) a plurality of data packets into two or more data flow classifications according to a transmission status for each data packet, a service requirement for each data packet, or both and selectively forwards (540) one or more of the data packets to the target base station node (430, 900) based on the data flow classification for each data packet. In some embodiments, the source base station node (410, 900) classifies (530) the data packets by inspecting (610) an Internet Protocol header for each packet to determine a corresponding service requirement. In some embodiments, the source base station node (410, 900) classifies (530) data packets by evaluating (650) a radio link control status to determine a transmission status for each data packet. In either case the source base station node (410, 900) selectively forwards (540) data packets corresponding to one or more of the classifications. For example, data packets associated with a reliable delivery service requirement may be forwarded while data packets associated with a maximum delay service requirement are not.
摘要:
The present invention relates to a base station and a method in a mobile telecommunication network for allocating and de-allocating uplink base station processing resources to a mobile terminal. The base station are adapted to communicate to a mobile terminal on an uplink channel supporting macro-diversity, and the base station is adapted to be a non-serving base-station without control of the resource allocation to the mobile-terminal. The base station comprises means for predicting a likelihood of successful decoding of a future transmission, and means for allocating or de-allocating processing resources based on said prediction.
摘要:
The present invention relates to a UE, base station network node and methods thereof in a cellular mobile communication system. One method concerns handover from a first radio base station to a second radio base station wherein, it comprises the steps receiving a notification from the first radio base station that currently serves said UE, said notification indicating the last packet to be transmitted to this user equipment from said first radio base station on a first connection; and informing the second radio base station by a request to commence transmission from this second radio base station when the notified last packet is received at the UE.
摘要:
A node (22) of a telecommunications network (2) receives, over a transmission chain (24) subject to packet jitter, packets of a connection involving a client device (26). The node (22) comprises a packet buffer (38) configured to store the packets received over the transmission chain prior to transmission of the packets to the client device (26). The node (22) further comprises a client-conscious scheduler (40) which is configured to schedule the transmission of the packets from the packet buffer (38) over a channel (32) to the client device (26) in accordance with a timing consideration of the client device (26). In an example embodiment, the timing consideration of the client device (26) which is taken into account by the scheduler (40) is avoidance of drain of a playout buffer of the client device.
摘要:
Select diversity in cellular radio communications involving both the radio access network and the mobile radio ensures that an optimal base station cell under a current condition is selected for communicating with the mobile radio. A candidate set of radio base station cells is defined for a radio connection between the radio network and the mobile radio. Packets are sent via the radio network to each of multiple radio base stations having a cell in the candidate set. The mobile radio detects a current quality of communication for the radio connection, and based on that detected quality, the candidate cell set may change. The mobile radio selects one of the cells in the candidate cell set to send a next or specific data packet based on one or more selection criteria.
摘要:
A radio access network node (24) comprises protocol data unit (PDU) formation logic (36); a PDU buffer (38); a concatenation timer (40); and a buffer readout mechanism (39). The protocol data unit (PDU) formation logic (36) serves, e.g., for segmenting incoming service data units (SDUs) to form protocol data unit (PDUs). The PDU buffer (38) stores one or more PDUs. The buffer readout mechanism (39) controls readout of contents of the PDU buffer (38). For example, when contents of a PDU in the PDU buffer (38) has not reach a predetermined fill level, the buffer readout mechanism (39) uses the concatenation timer for determining a delay for readout of the PDU from the PDU buffer (38). The delay provides opportunity for at least a portion of a yet-arrived SDU to be included in the PDU prior to readout of the PDU from the PDU buffer (38), and thereby reduce padding in an outgoing PDU.
摘要:
The invention relates to methods, a user equipment and a communication network entity for optimizing the radio resource utilization in a communication network system comprising a network side and a user equipment side between which data is transmitted on uplink (17) and downlink (16) channels with a transmit power and said user equipment (18) is arranged to adjust said transmit power on said uplink channels (17) according to gain factors received from said network side, wherein said user equipment (18) is located in a location area of said communication network system. The gain factors are transmitted to the user equipment (18) solely when the user equipment (18) accesses the network system instead of transmitting gain factors during every session setup as long as the user equipment (18) is in said location area.
摘要:
A method is described for controlling the conformance of a data flow in a communication system to a traffic definition. The communication system comprises a transmitter and a receiver and data packets transporting the data flow are sent from the transmitter to the receiver. The receiver sends responses identifying received data packets to the transmitter, and the transmitter comprises a control function which controls the number of sent data packets for which no response is received according to a limit for the number of outstanding data packets. A conditioning criterion is obtained for the data flow, the conditioning criterion being associated with the traffic definition. The receiver determines a conformance parameter for the received data packets transporting the data flow. The limit and/or the sending of the responses is modified according to the conditioning criterion and the determined conformance parameter for controlling the number of transmitted data packets.
摘要:
According to some embodiments, a method in a user equipment (920) is provided. According to the method, the user equipment receives, over a first cell (970) configured on a carrier frequency, at least one parameter associated with a second cell (980) configured on a carrier frequency. The at least one parameter comprises a cell identity. The user equipment (920) then derives (1050) at least one physical layer characteristic for the second cell (980) based on the received at least one parameter. Thereby, the user equipment (920) is able to receive transmissions over the second cell (980), even if it could not initially detect the presence of the cell.
摘要:
In a method and device the TCP load offered in the uplink is manipulated such that an offered load asymmetry is achieved. Using such an arrangement it is possible to compensate for a link asymmetry when uplink and downlink connections are sharing the same uplink buffer in order to increase performance of the downlink. The method and device are capable of increasing the download performance both in the case when TCP connections are terminated in a different device than the terminal where the link layer is terminated, as well as when the TCP connections are terminated in the same device as the link-layer.