| Determination of parameter values of an uplink transport channel -> Monitor Keywords |
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Determination of parameter values of an uplink transport channelRelated Patent Categories: Multiplex Communications, Communication Over Free Space, Repeater, Airborne Or Space Satellite Repeater, Multiple Access (e.g., Fdma), Time Division (tdma)Determination of parameter values of an uplink transport channel description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070189198, Determination of parameter values of an uplink transport channel. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The invention relates to a method for determining cell based values varying in time of a parameter associated to a selected active uplink transport channel multiplexed with at least one other transport channel to a dedicated physical channel. The invention equally relates to a corresponding network element, communications network and communications system. BACKGROUND OF THE INVENTION [0002] It is known to multiplex several uplink transport channels onto a dedicated physical channel for transmission in order to enable an effective use of available resources. [0003] The technical specification 3GPP TS 25.211 V3.7.0: "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical channels and mapping of transport channels onto physical channels (FDD) (Release 1999)" describes for example a multiplexing of Layer 1 transport channels onto physicals channels in the FDD (frequency division duplex) mode of the universal mobile telecommunications system (UMTS) terrestrial radio access (UTRA). [0004] According to this specification, a transport channel (TrCH) is defined by how and with what characteristics data is transferred over the air interface. Dedicated transport channels are referred to by dedicated channel (DCH). Physical channels are furthermore defined by a specific carrier frequency, a channelization code and, on the uplink, a relative phase. [0005] During an Radio Resource Control (RRC) connection several TrCHs may be multiplexed in the uplink by a terminal onto one code composite transport channel (CCTrCH), which is subsequently mapped to the data part of a dedicated physical channel (DPCH). This is illustrated by FIG. 1, which corresponds to a figure in the Technical Specification 3GPP TS 25.212 V3.4.0: "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Multiplexing and channel coding (FDD) (Release 1999)". [0006] As shown in FIG. 1, data provided by the MAC (Medium Access Control) and higher layers arrives at the coding/multiplexing unit 11 in form of a transport block sets on a transport channel TrCH#1 once every transmission time interval (TTI). The TTI is transport channel specific and can take one of the values 10 ms, 20 ms, 40 ms and 80 ma. First, different processing steps are applied to the transport block sets of each transport channel TrCH#1 separately, beginning with adding cyclic redundancy check (CPC) bits to each block 12 and terminating with rate matching 13. The processing steps applied to different transport channels are indicated in FIG. 1 by rectangles 14 grouping these steps. Afterwards, different TrCHs are multiplexed to a single CCTrCH 15. The CCTrCH is mapped after further processing onto a physical channel PhCH#1 16. The physical channel then undergoes spreading, scrambling and modulation. In case of multicode, the same applies to the other physical channels, denoted PhCH#2 etc. in the figure. For the details of the processing steps, which are depicted in FIG. 1 for one transport channel TrCH#1 and for the CCTrCH, it is referred to the cited specification TS 25.212. [0007] The DPCH onto which the CCTrCHs is napped consists of a dedicated physical control channel (DPCCH) and one or more dedicated physical data channels (DPDCH). The DPDCHs comprise the user data of the TrCHs. For the different DPDCHs different spreading codes are used, which enables a simultaneous WCDMA (Wideband Code Division Multiple Access) transmission. The DPCCH comprises predefined pilot bits to support channel estimation for coherent detection, transmit power control (TPC) commands and a transport format combination indicator (TFCI). DPCCH and DPDCHs are I/Q multiplexed within each radio frame with complex scrambling. [0008] In the uplink, the multi-code operation is possible, if the bit rate of the CCTrCH exceeds the maximum bit-rate of the uplink DPDCH and the maximum allowed amount of puncturing has already been applied. In this case, a spreading factor (SF) equal to 4 has then to be used for the different codes and up to 6 parallel DPDCHs car be used, while only one DPCCH per connection is possible. [0009] When the connection is set up, the terminal is given the minimum allowed SF of the uplink channelisation code for the data part and the variable rate is handled in a dynamic rate matching by changing the DPDCH bit rate (SF) frame by frame or by repeating or puncturing the code bits to achieve the total physical channel bit rate. In the uplink direction repetition is preferred. Puncturing is used to avoid multicode transmission or when facing the limitations of the User equipment transmitter or Node B receiver. [0010] The relative power level is set such that for higher bit rates the power of the DPCCH is higher, thus enabling a more accurate channel estimation, and the overhead, i.e. DPDCH vs. DPCCH power, of the DPCCH is still lower. [0011] Since several TrCHs may be multiplexed onto one CCTrCH, and since the quality, and in particular the Eb/No (bit energy per noise interference) requirements can be different in each transport channel, a rate-matching attribute is introduced for each TrCH, which is used in balancing the Eb/No values of the radio connection for a static or service specific rate matching. [0012] According to the specification TS 25.212, higher layers assign a rate-matching attribute for each transport channel. The rate-matching attribute is used to calculate a rate matching value when multiplexing several TrCHs for the same frame. The attribute is semi-static and can only be changed through higher layer signaling. By adjusting the rate-matching attribute, an admission control (AC) is thus able to fine-tone the quality of different bearer services in order to each an equal or near equal symbol power level requirement. Success of the static rate matching depends on, e.g., how correct the Eb/No value is in respect to the quality--e.g. BLER--target. [0013] With the aid of the rate matching attribute and the TFCI of the DPCCH, the receiver can calculate backwards the rate matching parameters used and perform the inverse operation. [0014] Static and dynamic rate matchings 13 are done simultaneously, they are also indicated in FIG. 1. [0015] Neither the Eb/No nor the quality of any TrCH set up during the same RRC connection is available from the conventional implementations. [0016] In order to overcome the effect of the possible incomplete static rate matching in the measured quantities, it would be an advantage, if uplink connection based measurements could be carried out for each bearer service or TrCH multiplexed onto one CCTrCH. [0017] Eb/No is also in general a key figure for receiver performance and can be employed for a variety of functions, as well in controlling as in evaluation. Moreover, other parameters associated to specific TrCHs, in particular quality parameters like BER (Bit Error Rate) and/or BLER (Block Error Rate), can be of interest, which parameters are only available for entire DPCHs in the current implementations. SUMMARY OF THE INVENTION [0018] It is an object of the invention to enable the determination of cell based values for a parameter associated to a selected transport channel multiplexed with other transport channels to a dedicated physical channel. [0019] The object is reached on the one hand with a method for determining cell based values varying in time of at least one parameter of a selected active uplink transport channel multiplexed with other transport channels to dedicated physical channel. The method comprises at a unit receiving the uplink transport channels computing in predetermined periods of time a value for the at least one parameter of the selected uplink transport channel based on at least one available parameter associated to the dedicated physical channel. The at least one available parameter is influenced by signals transmitted on all active transport channels multiplexed to the dedicated physical channel. Moreover, it is determined for the predetermined periods of time for each of the transport channels whether it is active in the respective period of time. Those periods of time for which it was determined that any other than the selected transport channel was active is excluded from supplying a relevant value for the at least one parameter of the selected active uplink transport channel. [0020] On the other hand, the object is reached with a network element for a communications network comprising means for determining cell based values varying in time of at least one parameter of a selected active uplink transport channel multiplexed with other transport channels to a dedicated physical channel according to the proposed method. The object is equally reached with a communications network and with a communications system comprising such a network element. [0021] The invention proceeds from the idea that even if several transport channels are multiplexed to a dedicated physical channel, only the respective active transport channels are able to influence a parameter which is determined for the entire dedicated physical channel. Inactive transport channels are in particular transport channels currently used for downlink transmissions. Therefore it is proposed to control the activity of all transport channels multiplexed to the considered dedicated physical channel. Thereby, it is known for respective periods of time if available parameter values associated to the dedicated physical channel are only influenced by a selected one of the transport channels. Only these parameter values are then accepted as basis for determining the desired transport channel specific parameter values. This means, in case other transport channels than the selected transport channel were active during a period of time, transport channel specific parameter values are either not determined. In the first place for this period, or transport channel specific parameter values are determined but then discarded. Continue reading about Determination of parameter values of an uplink transport channel... 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