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Method and system of link controlRelated Patent Categories: Telecommunications, Transmitter And Receiver At Separate Stations, With Control Signal, Transmitter Controlled By Signal Feedback From ReceiverMethod and system of link control description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070021071, Method and system of link control. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to retransmissions in a communications system, and more especially it relates to link load control in a cellular mobile radio system, particularly to a Universal Mobile Telecommunications System, UMTS or WCDMA system. BACKGROUND AND DESCRIPTION OF RELATED ART [0002] Retransmission of data to or from a mobile station, MS, or user equipment, UE, is previously known. If data is received in error, it is requested for retransmission. If errors are frequent, data is requested for retransmission frequently. When the relative amount of transmissions that are retransmissions of previously transmitted data increases the effective user data rate reduces, for a constant channel data rate. [0003] Increasing transmission power can often reduce transmission errors. Consequently, increasing transmission power can reduce the relative amount of retransmissions. Correspondingly, transmission power can be reduced if the relative amount of transmission errors is sufficiently small. [0004] U.S. Pat. No. 5,461,639 describes forward link power control in a CDMA system where error statistics are collected. The error rate is compared to a threshold. If the error rate exceeds the threshold, transmission power is increased. A code selector determines at which redundancy level to transmit. For each level of redundancy, the selector maintains a predetermined target error rate. [0005] International Patent Application WO0013362 describes a method and device for adapting a transmission data rate or a transmitter power to the transmission quality of a transmission channel. [0006] A channel data rate that gives an acceptable error rate at a given signal to noise ratio is selected. Transmission power is controlled. [0007] It is also known to use medium access control and radio link control layers of a UMTS protocol structure in acknowledged mode for dedicated channels and to broadcast system information. [0008] 3.sup.rd Generation Partnership Project (3GPP): Technical Specification Group Radio Access Network, Physical Layer Procedures, 3G TS 25.331 v3.5.0, France, December 2000, specifies an RRC protocol. Section 8.1.1 describes broadcast of system information. [0009] 3.sup.rd Generation Partnership Project (3GPP): Technical Specification Group Radio Access Network, Physical Layer Procedures, 3G TS 25.322 v3.5.0, France, December 2000, specifies the RLC protocol. The RLC layer provides acknowledged data transfer service. [0010] 3.sup.rd Generation Partnership Project (3GPP): Technical Specification Group Radio Access Network, Physical Layer Procedures, 3G TS 25.301 v3.6.0, France, September 2000, specifies in chapter 5 Radio Interface Protocol Architecture of a UMTS system. [0011] None of the cited documents describes a method and system of link control where error targets are selected as a function of transmission load in an ARQ scheme of a radio communications system. SUMMARY OF THE INVENTION [0012] In a power and interference limited system transmission power cannot be increase beyond all limits. For a high system traffic load, available power for each user is more restricted than at a low system traffic load. [0013] Perceived quality to an individual user needs to be balanced to overall system performance. Using only one fixed block error rate target, or one or more block error rate targets independent of traffic load, results in a too low perceived quality at low traffic load and a reduced throughput due to traffic being barred during high traffic load. [0014] Consequently, an object of this invention is to increase perceived quality and reduce delay as perceived by a user during low traffic load. [0015] It is also an object to increase system throughput during high traffic load. [0016] A further object is to present a system and method of communicating load control commands and block error rate targets between various system elements. [0017] Finally, it is an object to adaptively control link load using double loops including link load estimates and targets for transmission power control. [0018] These objects are met by a method and system of retransmissions such that target block error rate is determined in relation to traffic load. [0019] A first embodiment meets the objects for uplink load control with load measurements in a base station, BS, or Node B and load control in a radio network controller, RNC, communicating transmission power control targets, determined from block error rate targets, to the BS/Node B to be used for uplink transmission power control of a user equipment, UE. The block error rate targets, BLER targets, can be either determined to be the same for all connections or determined individually on a link by link basis. [0020] A second embodiment meets the objects for downlink load control with load measurements in a BS/Node B and load control in an RNC by communicating a set of BLER targets to the user equipment and depending on the load situation, which BLER target to use within the set. [0021] According to a third embodiment for downlink load control, only BLER targets to be considered by the UE are communicated to it and not an entire set of BLER targets. Continue reading about Method and system of link control... Full patent description for Method and system of link control Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method and system of link control patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Method and system of link control or other areas of interest. ### Previous Patent Application: Method for estimating the time of arrival of an access burst (ab), ab-detector of a base transceiver station (bts) for carrying out the method, and bts Next Patent Application: Voltage controlled oscillator band switching system Industry Class: Telecommunications ### FreshPatents.com Support Thank you for viewing the Method and system of link control patent info. IP-related news and info Results in 0.13953 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , 174 |
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