WO2001030090A2 - Procede et systeme de transmission sans fil de donnees de perte sensible - Google Patents

Procede et systeme de transmission sans fil de donnees de perte sensible Download PDF

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Publication number
WO2001030090A2
WO2001030090A2 PCT/SE2000/001906 SE0001906W WO0130090A2 WO 2001030090 A2 WO2001030090 A2 WO 2001030090A2 SE 0001906 W SE0001906 W SE 0001906W WO 0130090 A2 WO0130090 A2 WO 0130090A2
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WO
WIPO (PCT)
Prior art keywords
mobile station
data
handoff
detecting
transmitted
Prior art date
Application number
PCT/SE2000/001906
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English (en)
Other versions
WO2001030090A3 (fr
Inventor
David Sugirtharaj
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to CNA008173826A priority Critical patent/CN1754400A/zh
Priority to AU10656/01A priority patent/AU1065601A/en
Priority to EP00971916A priority patent/EP1224829A2/fr
Publication of WO2001030090A2 publication Critical patent/WO2001030090A2/fr
Publication of WO2001030090A3 publication Critical patent/WO2001030090A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation

Definitions

  • the present invention relates in general to wireless transmission of data, and in particular to the efficient processing of loss sensitive data services in a mobile telecommunications system. Description of Related Art
  • GPRS general packet radio service
  • the air interface that is used for communicating between a wireless mobile station and a fixed base station system is generally subject to greater data losses or bit errors than the hardwired connections that are used for transmitting packets of data via the Internet or other communications networks.
  • Such losses are particularly prevalent during handoff of a mobile station from one base station to another because the handoff causes a temporary interruption in the connection.
  • data losses and bit error rates tend to increase for a mobile station that is involved in frequent handoffs, such as when the mobile station is traveling from cell to cell at a rapid rate of speed.
  • various intermediate nodes in a data communication network frequently include buffers that temporarily store packets of data, or a portion thereof, during the transmission process and for a short period after the packet is transmitted. Accordingly, when a loss or error occurs, the data can be re-transmitted from a nearby node rather than having to send a retransmission request all the way back to the originating node. If significant amounts of data have to be re-transmitted, however, the buffers can overflow, necessitating a retransmission of one or more data packets from the originating node. Such a retransmission from the originating node slows the effective rate of data transfer and reduces the overall quality of service that is provided to the mobile station.
  • the present invention comprises a method and system for use in connection with data transmissions in a wireless communication system.
  • the method and system are used to improve the quality of service provided to a mobile station during the transmission of loss-sensitive data.
  • the network reallocates resources to at least partially compensate for the poor transmission conditions.
  • the system detects an impending need for handoff of the mobile station from a serving base station to a target base station during an ongoing data transmission.
  • the system identifies the target base station as a candidate cell for the handoff at the mobile station in response to the detection of an impending need for a handoff.
  • a signaling node that is used in the routing of data transmitted to the mobile station allocates buffering resources in the candidate cell prior to the handoff. These resources are allocated for use in connection with the data transmission.
  • the signaling node begins transmitting data to the target base station prior to the handoff. This data can then be stored in the allocated buffering resources prior to completion of the handoff. The stored data is then available for transmission to the mobile station from the target base station immediately upon completion of the handoff, thereby reducing the likelihood of substantial data loss, and/or the detrimental effects of high bit error rates, during the handoff procedure.
  • a wireless data communication system includes a buffer for storing data to be transmitted to a mobile station.
  • the buffer has a configurable amount of memory that is allocated for storing data in connection with data communications with the mobile station.
  • a signaling node that is used for routing data to the mobile station increases the amount of buffer memory that is allocated for the data communications. This increase serves to at least partially compensate for the potential reduction in the quality of service.
  • Such a potential reduction in the quality of service can include, for example, a detection of a bit error rate that is above a selected threshold, a detection of a relatively high velocity of the mobile station, an identification of a need for handoff of the mobile station, or a determination that a quantity of data stored in the allocated buffering resources exceeds the selected threshold.
  • the system and method of this embodiment operate to help avoid the need to retransmit the data from an originating node by allowing increased amounts of the data to be stored in a node that is near the mobile station in the data transmission network.
  • the data communication system includes a server from which data to be transmitted to the mobile station originates.
  • the system further includes a buffer in a wireless network that is used for storing data to be transmitted to the mobile station.
  • a signaling node in the wireless network increases the transmission rate of data stored in the wireless network buffer to at least partially compensate for the potential reduction in the quality of service.
  • the increased transmission rate results from an allocation of additional transmission resources in a wireless network, such as an increase in the number of time slots used for transmitting data to the mobile station.
  • data can be cleared from the wireless network buffer at a more rapid rate, thereby reducing the likelihood that data will need to be transmitted from the originating server during a period of increased data loss or of high transmission errors.
  • FIGURE 1 is a block diagram of one type of data network for conducting wireless data communications
  • FIGURE 2 is a graph showing an illustrative example of the quality of service to a mobile station
  • FIGURE 3 shows a global positioning satellite system that can be used in connection with a mobile cellular network
  • FIGURE 4 depicts a portion of the cellular network through which a highway passes;
  • FIGURE 5 illustrates a flow diagram of a method for improving a quality of a data communication service to a mobile station using dynamic buffer allocation in accordance with one embodiment of the invention
  • FIGURE 6 shows a flow diagram of a method for improving the quality of a data communication service to a mobile station by early handoff initiation in accordance with another embodiment of the present invention
  • FIGURE 7 illustrates a flow diagram of a method for improving the quality of a data communication service to a mobile station using early handoff initiation in accordance with an alternative embodiment of the present invention
  • FIGURE 8 shows a flow diagram of a method for improving the quality of a data communication service to a mobile station using early handoff initiation in accordance with yet another alternative embodiment of the present invention
  • FIGURE 9 illustrates a flow diagram of a method for improving the signal quality of a data communication service by increasing the transmission rate to a mobile station in accordance with another embodiment of the invention.
  • FIGURE 10 depicts a flow diagram of a method for improving the signal quality of a data communication service by increasing the transmission rate to a mobile station in connection with a handoff in accordance with yet another embodiment of the present invention.
  • FIGURE 1 there is shown a block diagram of one type of data network for conducting wireless data communications.
  • the data network shown in the Figures and discussed below is a general packet radio service (GPRS) system 2.
  • GPRS is a wireless data protocol that is used in connection with GSM standards. It will be understood by those of ordinary skill in the art, however, that the present invention can also be used in connection with other types of packet switched networks and with circuit switched networks.
  • the types of data handled by a data network 2 can vary widely and might include, for example, data structures, images, and/or software. Most such data communications, as compared with voice communications, are particularly sensitive to data losses or bit errors. In fact, it is generally not acceptable for there to be any data loss or bit errors in connection with the transmission of loss sensitive data. It is, therefore, necessary to have mechanisms in place that permit correction of errors and retransmission of lost data. Such mechanisms are of particular importance in the wireless data communication context because the air interface that is used for wireless transmissions tends to be especially susceptible to errors or losses during transmission.
  • the application server 12 retrieves the requested data and transmits a data packet containing the data, or a portion thereof, toward the requesting mobile station 10 via a packet network 16 such as the Internet.
  • the packet network 16 includes a plurality of routing nodes 14. Each routing node 14 receives the transmitted data packet and retransmits it over the next hop to another routing node 14 in accordance with the address of the final destination (i.e., the mobile station 10).
  • the data packet reaches a serving GPRS support node (SGSN) 18 that serves the area where the mobile station 10 is located.
  • the SGSN 18 reformats the data packet for transmission in the GPRS system. This reformatting might involve, for example, converting the data packet from TCP/IP protocol to GPRS protocol.
  • the SGSN 18 forwards the data packet to a serving base station (BS) 20 for the mobile station 10.
  • BS serving base station
  • the base station 20 in turn sends the data packet over an air interface 22 to the mobile station 10.
  • the SGSN 18 includes a buffer memory (M) 24 for temporarily storing data packets to be transmitted to the mobile station 10.
  • the base station 20 also includes a buffer memory (M) 26 for temporarily storing data packets to be transmitted to the mobile station 10.
  • M buffer memory
  • data that is lost or data packets that contain bit errors upon receipt by the mobile station 10 can be retransmitted to the mobile station 10 from one of the buffer memories 24 or 26. This ability to retransmit stored data from a relatively local node avoids the delay that would be caused by having to request and perform a retransmission from the application server 12.
  • a confirmation message can be sent to the base station 20 and the SGSN 18 providing a notification of the successful transmission.
  • the data in the buffer memories 24 and 26 can then be deleted, thereby freeing up room for additional data packets to be received from the packet network 16 for transmission to the mobile station 10. If, however, relatively large amounts of data are lost or frequent bit errors occur, the amount of buffer space allocated for data communications with the mobile station 10 can overflow. In other words, data packets to be transmitted to the mobile station 10 might be received by the SGSN 18 and/or the base station 20 at a faster rate than data is being deleted from the buffer memory 24 or 26. Such an occurrence causes some data to be lost because there is not sufficient buffer space to store all of the data. The loss of data necessitates retransmission of data from the application server 12, thereby reducing the quality of service to the mobile station 10 by slowing the rate of data transfer.
  • One of the primary causes of data loss or errors in transmission is handoff of a mobile station 10 from one base station 20 to another.
  • the signal strength of signals received by the mobile station 10 tends to decrease.
  • the mobile station 10 periodically measures the strength of signals from the serving base station and from base stations 20 in adjacent cells. The mobile station 10 forwards this information to the serving base station 20 so that a determination can be made as to when handoff to another base station 20 is necessary.
  • the wireless network recognizes that a handoff should be executed. Based on the measured strengths of signals from base stations 20 in adjacent cells, the wireless network identifies a target cell and initiates a handoff (as indicated at 28) of the mobile station 10 from the serving base station 20 to a target base station 20' in the target cell.
  • communications with the mobile station 10 are conducted via an air interface 22' between the mobile station 10 and the target base station 20', which becomes the new serving base station 20'.
  • Data to be transmitted to the mobile station 10 is then sent by the SGSN 18 to the new serving base station 20' so that it can be transmitted to the mobile station 10.
  • communications with the mobile station 10 are temporarily interrupted. This interruption will frequently result in some data being lost, thereby necessitating a retransmission of the lost data. In some cases, the loss of data can even cause the buffer memory 24 or 26 to overflow, which necessitates retransmission from the application server 12.
  • the mobile station 10 travels across the cells in the wireless network more rapidly, causing more frequent handoffs between cells. As the frequency of handoffs increases, problems with lost data and bit errors tend to multiply, further reducing the effective rate of data transfer. In addition, frequent handoffs can place more demands on network processing resources (e.g., logic processing and data storage), which can also affect the data transfer rate. Furthermore, reductions in the rate of data transfer can occur because data transmissions to the mobile station 10 are not possible under certain radio conditions. When the mobile station 10 is unable to receive data, a build-up and overflow of data in the buffers 24 and 26 can occur.
  • network processing resources e.g., logic processing and data storage
  • FIGURE 2 there is depicted a graph showing an illustrative example of the quality of service provided to a mobile station 10 versus the proximity of the mobile station 10 to the base station 20.
  • the quality of service provided tends to be at or near its maximum (as indicated at 42).
  • the quality of service 40 is substantially reduced (as indicated at 44).
  • a bit error rate (BER) 46 for communications with the mobile station 10 correspondingly increases.
  • a network operator could implement procedures or mechanisms in the network to provide a more consistent effective quality of service 40 to the mobile station so as to reduce the bit error rate and/or data loss as the mobile station 10 nears the edge of the serving cell, or as the mobile station 10 becomes involved in a handoff.
  • the size of the buffers 24 and 26 used to store data packets in the wireless data communication system can be dynamically increased as necessary to compensate for substantial data losses or high bit error rates.
  • Current GPRS systems have static buffers; once the buffers reach capacity, the buffer begins to overflow, causing a loss of data.
  • data is forwarded to a target base station 20' prior to the completion of a handoff.
  • Existing wireless data communication systems generally use a concept of capacity on demand. Thus, resources in the target cell are not allocated for use in data communications until the mobile station 10 is actually in communication with the target base station 20' (i.e., when handoff is substantially complete). If data is lost during handoff, that data must be retransmitted.
  • data is immediately available for transmission to the mobile station 10 upon completion of handoff, thereby improving the quality of service provided to the mobile station 10.
  • the handoff process can also be initiated earlier to further reduce the probability that significant amounts of data might be lost.
  • handoff of the mobile station 10 can be initiated earlier and more efficiently by predicting an impending handoff based on a calculated velocity and direction of travel of the mobile station 10.
  • the network 2 monitors the position of the mobile station 10. Based on detected changes in the mobile station's position over time, the velocity and direction of travel can be calculated. An approximate time and target cell for handoff can then be predicted using the velocity vector information in connection with a known cellular network topology. Using these predictions, handoff can be initiated earlier and accomplished more quickly, thereby reducing the potential for significant data loss.
  • the transmission rate of data to the mobile station 10 can be increased to compensate for actual or anticipated data losses or high bit error rates.
  • a subscriber negotiates a certain level of service. For example, depending on how much the subscriber is willing to pay, the subscriber might be able to receive between approximately 14 kilobits per second (kbs), which corresponds to an allocation of one time slot to the data transmission, and approximately 115 kbs, which corresponds to an allocation of eight time slots.
  • the level of service is then determinative of the maximum number of time slots that will be allocated to the subscriber at any one time.
  • this limit In addition to preventing time slots in a target cell from being allocated while the mobile station 10 is still operating in another cell, this limit also prevents the mobile station 10 from being able to receive data at a faster rate than what has been negotiated by the subscriber. By allocating additional time slots to the mobile station, however, when the bit error rate is high, buffers can be emptied quicker, and the need for retransmissions can be avoided.
  • GPS global positioning satellite
  • the GPS system 4 includes a plurality of positioning satellites 30 that continuously transmit signals (as indicated at 31) containing satellite location and time reference data.
  • a GPS receiver 32 designed to receive the signals transmitted by the positioning satellites 30.
  • the GPS receiver 32 can determine a current location, velocity vector, and time reference for the mobile station 10 in accordance with known processing methods. This information can be displayed at the mobile station 10 and can further be forwarded to a serving base station 20 over the air interface 22 so that the cellular network 2 can monitor the mobile station's position, velocity, and direction of travel.
  • FIGURE 4 there is illustrated a portion of the cellular network 2 through which a highway 34 passes.
  • a mobile station 10 travels along the highway 34 at a relatively high velocity, it moves from one cell 38 to the next at a rate that is proportional to its velocity.
  • handoffs must be performed more frequently than in the case of a mobile station 10 that is slow moving or stationary.
  • a GPS receiver 32 included in the mobile station 10 can be used to inform the cellular network 2 of the position, velocity, and direction of travel for the mobile station 10.
  • other procedures for locating the mobile station 10 can be used.
  • the mobile station's position can be triangulated using a measured propagation delay of signals between the mobile station 10 and multiple base stations 20.
  • the network 2 can predict the approximate time at which handoff will be necessary.
  • the network 2 can reduce the list of candidate cells 38 for handoff so as to predict which cell or cells 38 are most appropriate for handoff based on the detected direction of travel 33. This allows the network 2 to begin the handoff process earlier (i.e., before the mobile station 10 reaches the cell boundary 36) and to conduct handoff more efficiently, thereby reducing the probability or extent of data loss during handoff.
  • FIGURE 5 there is illustrated a flow diagram 50 of a method for improving a quality of a data communication service to a mobile station 10 using dynamic buffer allocation in accordance with one embodiment of the invention.
  • a data transmission is initiated, wherein loss sensitive data is retrieved from an application server 12 and sent to the mobile station 10 via a GPRS network 2.
  • the network detects, through the use of a GPS system 4 or other positioning system, that the mobile station 10 is traveling at a high velocity at step 54.
  • the amount of buffer space allocated to the mobile station 10 in the buffer memories 24 and 26 of the SGSN 18 and the base station 20 is increased at step 56.
  • This increase in buffer space helps prevent buffer overflow and permits data retransmissions, if necessary, to be made from a relatively local node rather than from the distant application server 12.
  • the velocity of the mobile station 10 is monitored to determine whether it has decreased at step 58. Also at step 58, the data transmission is monitored to determine if it is complete. If neither of these conditions is satisfied, the allocated buffer space remains the same and the monitoring continues. However, if the velocity of the mobile station 10 decreases or if the data transmission is complete, the amount of buffer space allocated to the mobile station 10 is reduced back to normal levels at step 60.
  • the method illustrated in FIGURE 5 is shown and described in connection with a high velocity mobile station 10, it is also possible to implement the procedure in connection with other circumstances involving a reduction in the quality of service to the mobile station 10.
  • FIGURE 6 there is illustrated a flow diagram 70 of a method for improving the quality of a data communication service to a mobile station 10 by early handoff initiation in accordance with another embodiment of the present invention.
  • a data transmission is initiated, wherein loss sensitive data is retrieved from an application server 12 and sent to the mobile station 10 via a GPRS network 2.
  • the network 2 detects that the mobile station 10 is traveling at a high velocity at step 74.
  • the signal threshold for handoff is increased at step 76, causing handoff to be initiated earlier.
  • the signal strength begins to decrease.
  • the mobile station 10 and/or the cellular network begins to search for candidate cells for handoff. Because the signal threshold for the high velocity mobile station 10 has been increased, however, this initiation of the handoff procedure begins earlier than in a standard handoff scenario.
  • the network 2 detects an impending handoff (i.e., the detected signal strength falls below the signal threshold).
  • the network 2 identifies one or more candidate cells for handoff of the mobile station 10.
  • the network 2 uses the velocity vector for the mobile station 10 to predict which cell or cells are the most likely cells for handoff and uses these predictions to reduce the list of candidate cells.
  • the network 2 allocates resources in the candidate cell or cells at step 82.
  • this resource allocation includes an allocation of buffer space in the candidate cell. This allows data to be forwarded to and stored in the candidate cell in advance of handoff, so that data transmissions can resume immediately upon completion of handoff. By providing longer notice of handoff, resource demands can be spread over time, the risk of losing calls during handoff is reduced, and there is a lower risk of losing data during handoff between cells.
  • FIGURE 7 there is illustrated a flow diagram 90 of a method for improving the quality of a data communication service to a mobile station 10 using early handoff initiation in accordance with an alternative embodiment of the present invention.
  • a data transmission is initiated.
  • the network 2 predicts the approximate dwell time of the mobile station 10 in the serving cell at step 92.
  • the dwell time can be estimated using a detected velocity vector for the mobile station 10 in conjunction with a known cellular topology of the cellular system 2.
  • the dwell time can be predicted based on recent dwell times for the mobile station 10 in previous cells.
  • use of a predicted dwell time is primarily applicable during highway travel, where velocity is relatively constant and the direction of travel can be predicted with a relatively high degree of accuracy.
  • an impending handoff is identified at step 78. Subsequently, the process continues in accordance with steps 80-84, as shown in and discussed in connection with FIGURE 6. For example, if the network determines that the dwell time in the serving cell for the mobile station 10 is twenty seconds, the network might allocate buffer space in the candidate cell and begin storing data there after the mobile station 10 has been in the serving cell for ten seconds.
  • FIGURE 8 there is illustrated a flow diagram 100 of a method for improving the quality of a data communication service to a mobile station 10 using early handoff initiation in accordance with yet another alternative embodiment of the present invention.
  • a data transmission is initiated.
  • the network 2 detects a diminishing signal quality of signals between the serving base station 20 and the mobile station 10. As illustrated in FIGURE 2, such a diminished signal quality is frequently caused by the mobile station 10 moving away from the base station 20 in the serving cell.
  • the network 2 identifies a candidate cell for handoff at step 80, allocates resources in the candidate cell at step 82, and performs handoff at step 84, as in the methods shown in FIGURES 6 and 7.
  • a flow diagram 110 of a method for improving the signal quality of a data communication service by increasing the transmission rate to a mobile station 10 in accordance with another embodiment of the invention is initiated.
  • a transmission of data to the mobile station 10 is initiated.
  • such a data transmission generally involves a predetermined maximum number of time slots, depending upon the level of service negotiated by the subscriber. This maximum number of time slots limits the rate at which data can be transmitted to the mobile station 10.
  • the network 2 detects a high bit error rate for communications with the mobile station 10 at step 114.
  • the network 2 temporarily increases the transmission rate for communications with the mobile station 10 by allocating additional time slots, assuming that they are available in the serving cell, to the mobile station 10 at step 116.
  • This increased transmission rate effectively prevents a noticeable decline in the quality of service to the mobile station 10.
  • FIGURE 9 depicts increasing the transmission rate in connection with a high bit error rate, this procedure can also be used to improve the quality of service in other situations.
  • the transmission rate can also be increased when the buffer memory begins to approach capacity, thereby emptying data from the buffer at a faster rate.
  • FIGURE 10 there is illustrated a flow diagram 120 of a method for improving the signal quality of a data communication service by increasing the transmission rate to a mobile station 10 in connection with a handoff in accordance with yet another embodiment of the present invention.
  • a data transmission is initiated.
  • the network 2 determines that a handoff is imminent (e.g., in accordance with the procedures discussed in connection with FIGURES 6-8).
  • the network 2 then identifies a candidate cell for handoff at step 80, allocates resources in the candidate cell at step 82, and performs handoff at step 84.
  • the transmission rate in the candidate cell is temporarily increased at step 116 so that the stored data can be at least partially cleared from the buffer. Once the buffer has been cleared, the transmission rate is returned to normal at step 118. This decrease in the transmission rate can occur, for example, once the buffer has been emptied below a selected threshold or after a certain number of data packets have been transmitted in the new cell.
  • early handoff procedures can be used in conjunction with increases in the transmission rate to improve service quality.
  • dynamic buffering procedures can also be used in connection with early handoff procedures and/or increases in the transmission rate to improve service quality.

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Abstract

L'invention concerne un procédé et un système utilisés pour améliorer la qualité du service de transmission de données vers une station mobile (10). Selon l'un des modes de réalisation de la présente invention, une cellule candidate (38(2)) pour le transfert d'une station mobile est identifiée en réponse à la détection d'un besoin de réalisation d'un transfert. Des ressources tampon employées au cours de la connexion avec la transmission de données sont alors fournies (82) dans la cellule candidate. Selon un autre mode de réalisation, une condition entraînant une réduction potentielle de la qualité du service vers la station mobile est détectée, et en réponse à cette dernière, une augmentation des ressources tampon existantes dans le système est fournie (56), afin de compenser la réduction potentielle de la qualité du service. D'après un troisième mode de réalisation de cette invention, une condition entraînant une réduction potentielle de la qualité du service vers la station mobile est détectée. En réponse à cette dernière, la vitesse de transmission de données vers la station mobile augmente (116) afin de compenser la réduction potentielle de la qualité du service.
PCT/SE2000/001906 1999-10-18 2000-10-03 Procede et systeme de transmission sans fil de donnees de perte sensible WO2001030090A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CNA008173826A CN1754400A (zh) 1999-10-18 2000-10-03 丢失敏感数据的无线发射方法和***
AU10656/01A AU1065601A (en) 1999-10-18 2000-10-03 Method and system for the wireless transmission of loss sensitive data
EP00971916A EP1224829A2 (fr) 1999-10-18 2000-10-03 Procede et systeme de transmission sans fil de donnees de perte sensible

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US42031199A 1999-10-18 1999-10-18
US09/420,311 1999-10-18

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WO2001030090A2 true WO2001030090A2 (fr) 2001-04-26
WO2001030090A3 WO2001030090A3 (fr) 2001-11-15

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WO2004039007A1 (fr) * 2002-10-28 2004-05-06 Koninklijke Philips Electronics N.V. Reduction de l'abandon de paquets lors d'un transfert ieee 802.11 en cas de reacheminement de paquets par file d'attente de pilotes miroirs
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US7075886B2 (en) 2001-12-21 2006-07-11 Itt Manufacturing Enterprises, Inc. Method and apparatus for routing information in satellite communication networks
WO2006099404A2 (fr) * 2005-03-11 2006-09-21 Interdigital Technology Corporation Procede et systeme de determination de voisins et d'estimation de probabilite d'un transfert fondes sur l'emplacement d'une station
WO2007074514A1 (fr) 2005-12-27 2007-07-05 Fujitsu Limited Procede de controle de transfert intercellulaire
EP1867195A1 (fr) * 2004-12-30 2007-12-19 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Procede et appareil de commande de flux au niveau du changement de cellule pour un acces par paquets de liaison descendante a haute vitesse
WO2008095535A1 (fr) 2007-02-08 2008-08-14 Telefonaktiebolaget Lm Ericsson (Publ) Réduction du débordement de tampon
GB2533942A (en) * 2015-01-07 2016-07-13 Vodafone Ip Licensing Ltd Adaptive buffering of a content player for a mobile device in a telecommunication network
WO2020029167A1 (fr) * 2018-08-09 2020-02-13 Zte Corporation Procédés, appareil et systèmes de gestion d'un cache local associé à un noeud de communication sans fil
US20220279405A1 (en) * 2019-09-29 2022-09-01 Apple Inc. Pre-Forwarding Data Packets for Conditional Handover

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CN112703766A (zh) * 2018-08-09 2021-04-23 中兴通讯股份有限公司 由无线通信节点执行的方法、无线通信节点
CN112703766B (zh) * 2018-08-09 2023-07-14 中兴通讯股份有限公司 由无线通信节点执行的方法、无线通信节点
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AR030031A1 (es) 2003-08-13
EP1224829A2 (fr) 2002-07-24
WO2001030090A3 (fr) 2001-11-15

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