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  Method of managing processing resources in a mobile radio systemUSPTO Application #: 20060089150Title: Method of managing processing resources in a mobile radio system Abstract: A method of managing processing resources in a mobile radio system, in which a first entity manages radio resources and corresponding processing resources, the latter being provided in a second entity separate from the first entity. The second entity signals to the first entity its global processing capacity, or capacity credit, and the consumption law, or quantity of the global processing capacity, or cost, for different spreading factor values. The first entity updates the capacity credit on the basis of the consumption law. In the case of multicode transmission using N spreading codes, the updating is effected on the basis of the cost for at least one of the N spreading codes. (end of abstract) Agent: Sughrue Mion, PLLC - Washington, DC, US Inventor: Pascal Agin USPTO Applicaton #: 20060089150 - Class: 455453000 (USPTO) Related Patent Categories: Telecommunications, Radiotelephone System, Zoned Or Cellular Telephone System, Channel Allocation, Load Balancing The Patent Description & Claims data below is from USPTO Patent Application 20060089150. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a continuation of U.S. patent application Ser. No. 10/073,950, filed on Feb. 14, 2002, the entire disclosure of which is incorporated herein in its entirety. The present application also claims priority from French application No. 0102527 filed Feb. 23, 2001, which is also incorporated herein by reference. [0002] The present invention relates generally to mobile radio systems and more particularly to systems using the code division multiple access (CDMA) technique. BACKGROUND OF THE INVENTION [0003] The CDMA technique is used in third generation systems such as the Universal Mobile Telecommunication System (UMTS). [0004] As shown in FIG. 1, a mobile radio network generally includes a set of base stations and base station controllers. In the UMTS, this network is called the UMTS terrestrial radio access network (UTRAN), a base station is called a Node B, and a base station controller is called a radio network controller (RNC). [0005] The UTRAN communicates both with mobile stations, which are called user equipments (UE), via a Uu interface, and with a core network (CN) via an Iu interface. [0006] As shown in FIG. 1, the RNCs are connected: [0007] to the Node B via an Iub interface, [0008] to each other via an Iur interface, and [0009] to the core network CN via an Iu interface. [0010] The RNC that controls a given Node B is called the controlling radio network controller (CRNC) and the CRNC is therefore connected to the Node B via the Iub interface. The CRNC has a load control function and a radio resource allocation control function for the Node B that it controls. [0011] The RNC for a given call relating to a given user equipment UE is called the serving radio network controller (SRNC) and is connected to the core network CN via the Iu interface. The SRNC has a control function for the call concerned, including functions of adding or removing radio links (in accordance with the macrodiversity transmission technique) and monitoring parameters that may change during a call, such as bit rate, power, spreading factor, etc. [0012] In CDMA systems radio interface capacity limitations are fundamentally different from those of systems using other multiple access techniques, such as the time division multiple access (TDMA) technique. The TDMA technique is used in second generation systems such as the Global System for Mobile communications (GSM). In CDMA systems, all users share the same frequency resource at all times. The capacity of these systems is therefore limited by interference, and for this reason these systems are known as soft limited systems. [0013] This is why CDMA systems use algorithms, such as load control algorithms which prevent, detect and if appropriate correct overloads, in order to prevent quality being degraded, and call admission control algorithms which decide if the capacity of a cell not being used at a given time is sufficient to accept a new call in that cell (as a function of various parameters such as the service required for that call, etc.). In the following description these algorithms are referred to generically as load control algorithms. [0014] These algorithms usually use only radio criteria and are usually implemented in the CRNC, which has no information about the processing capacity of each Node B that it controls. This being the case, it is possible for a new call to be accepted by the CRNC but in the end to be rejected for want of Node B processing resources, for example, which leads to unnecessary additional processing in the CRNC and additional exchanges of signaling between the CRNC and the Node B. [0015] Of course, it would be possible to avoid these problems by providing the Node B with sufficient processing resources to cover all situations, including that of maximum capacity (corresponding to the case of a very low level of interference). But this would lead to costly base stations which would have more capacity than necessary most of the time. In addition, in the case of progressive introduction of the services offered by these systems, the processing capacity of the base stations may be limited when the systems begin to be put into service, and then progressively increased afterwards. [0016] It would therefore be desirable for load control in this kind of system to allow for the base station (Node B) processing capacity. [0017] FIGS. 2 and 3 respectively show the main sending and receiving processing operations used in a base station, such as a Node B in the UMTS, for example. [0018] FIG. 2 shows a sender 1 including: [0019] channel coder means 2, [0020] spreader means 3, and [0021] radio frequency transmitter means 4. [0022] The various processing operations are familiar to the person skilled in the art and do not need to be described in detail here. [0023] Channel coding uses techniques such as error corrector coding and interleaving to protect against transmission errors. This is known in the art. Continue reading... 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