Abstract: The provisioning of a service, such as a multimedia service, over different networks is described. Transmission of first and second data streams is established in first and second transmission modes over first and second networks. The first and second data streams carry the same content, and the first and second networks employ first and second radio access technologies. At the receiver, the first and second data streams are combined at the application layer into a combined data stream, which is decoded into an output for presentation to a user.

Abstract: A generalized duplexing method, base station (122) and mobile station (118) for TDD operation in a communication system (100) having a primary carrier (310; 410) operating in TDD mode; and at least one secondary carrier (320; 420). The method supports half-duplex and full duplex modes of operation. The primary and secondary carrier may operate at different chip rates. This provides the advantages that generalized duplexing operates on more than one RF carrier, and unlike conventional UTRA FDD mode generalized duplexing does not require a fixed frequency duplex spacing between RF carriers.

Abstract: An encoder and method for efficient synchronization channel encoding in UTRA TDD mode by: producing a codeword a, where a=dG+z modulo-2, where d represents a predetermined code group to be encoded, G represents a predetermined generator matrix, and z represents a function of the code group number and a row of the generator matrix; producing values sk=2a2k+1+ak;k=0, 1, 2, 3, and associated values b0,b1,b2; and producing a value Sssc associated with the code group, where Sssc=(b0c?(0),b1c?(1),b2c?(2)), c? represents a code within the code group, and b0,b1,b2?(±1,±j). This provides an efficient encoding architecture for the synchronization channel in UTRA TDD mode; and, in addition, by simple manipulation of the generation matrix, a higher chip rate signal may be signalled while still preserving the signalling information for the lower chip rate.

Abstract: A method and arrangement for automatic frequency correction in UTRA TDD mode, having a first stage (500) for frequency lock in idle mode, and a second stage (600) for receiving a channel estimate from beacon function (mx1), receiving a channel estimate from at least one other physical channel (mx2), and receiving output from a primary synchronisation code correlator (mx0, pc1, pc2), and for producing therefrom signals (X,Y,N) for use in frequency correction. By utilising first and second partial correlation values (pc1, pc2) which are balanced, DC offset effects may be substantially removed. This provides the following advantage of significantly improving performance at low levels of SNR, and removal of DC offset effects provides immunity to DC offsets arising from imperfections in hardware.

Abstract: A method and arrangement (100) for PRACH burst channel detection in a UTRA TDD wireless communication system in which training sequences are constructed from a single periodic base code. Unwanted cross-correlation peaks, having magnitude less than correlation peaks, are removed (440) from the correlator outputs, maintaining optimal signal-to-noise ratio of the channel estimates, providing a low probability of false detection, and extending the cell size of a CDMA network to that determined by the guard period duration. The cell size can be extended further by ensuring that no transmissions are scheduled for the timeslot subsequent to that in which the channel estimation bursts are scheduled.

Abstract: A chip rate invariant detector (FIG. 2) is used in a wireless spread spectrum high capacity communications system which can accommodate two or more different chip rates. At a higher chip rate the data blocks are segmented into uniform suitable sizes for the detector which has an increased data block length to prevent loss of information to smearing due to effective overlap of segmented data blocks. The resultant data blocks are cut down to standard size by discarding samples and applied to a matched filter for further standard information processing.

Abstract: A cellular wireless internet access system which operates in the 2.5 to 2.68 GHz band and which must comply with complex government regulations on power levels, subscriber equipment and interference levels yet which provides high data rates to users and cell sizes of 1½ miles radius or more from base stations with subscriber equipment and antennas mounted indoors. Such base stations are mounted low and use spread-spectrum transmission to comply with interference rules with respect to adjacent license areas. An unidirectional tear-drop coverage pattern is used at multiple cells to further reduce interference when required. Time division duplex is used to allow the system to operate on any single channel of varying bandwidth within the 2.5 to 2.68 GHz band. Backhaul transmission from base stations to the Internet is provided using base station radio equipment, operating either on a different frequency in the band or on the same frequency using a time-division peer-to-peer technique.

Abstract: An encoder and method for efficient synchronisation channel encoding in UTRA TDD mode by: producing a codeword a, where a=dG+z modulo-2, where d represents a predetermined code group to be encoded, G represents a predetermined generator matrix, and z represents a function of the code group number and a row of the generator matrix; producing values sk=2a2k+1+ak;k=0,1,2,3, and associated values b0,b1,b2; and producing a value Sssc associated with the code group, where Sssc=(b0c&pgr;(0),b1c&pgr;(1),b2c&pgr;(2)), c&pgr; represents a code within the code group, and b0,b1,b2 &egr; (±1,±j). This provides an efficient encoding architecture for the synchronisation channel in UTRA TDD mode; and, in addition, by simple manipulation of the generation matrix, a higher chip rate signal may be signalled whilst still preserving the signalling information for the lower chip rate.

Abstract: Processing of a received code division multiple access, CDMA, burst (405) when a spreading factor of the CDMA burst (405) has been changed from an allocated spreading factor (SF0) to a new spreading factor (SFn) The received burst (405) is processed with a CDMA detector (310), using the allocated spreading factor (SF0), to provide a CDMA detector output; the new spreading factor (SFn) of the burst is determined; and the CDMA detector output is decimated by a factor determined from the new spreading factor (SFn). The decimator may be a FIR decimator (315) and tap weights may be determined using the values of the new spreading factor (SFn) and the allocated spreading factor (SF0) Application in a Node B (150A) of a UMTS system (100), particularly in UTRA TDD mode, for processing received uplink communication is described.

Abstract: A method and arrangement for automatic frequency correction in UTRA TDD mode, having a first stage (500) for frequency lock in idle mode, and a second stage (600) for receiving a channel estimate from beacon function (mx1), receiving a channel estimate from at least one other physical channel (mx2), and receiving output from a primary synchronisation code correlator (mx0, pc1, pc2), and for producing therefrom signals (X,Y,N) for use in frequency correction. By utilising first and second partial correlation values (pc1, pc2) which are balanced, DC offset effects may be substantially removed. This provides the following advantage of significantly improving performance at low levels of SNR, and removal of DC offset effects provides immunity to DC offsets arising from imperfections in hardware.

Abstract: A chip rate invariant detector (FIG. 1) is used in a wireless spread spectrum high capacity communications system which can accommodate two or more different chip rates. At a higher chip rate the data blocks are segmented into uniform suitable sizes for the detector which has an increased data block length to prevent loss of information to smearing due to effective overlap of segmented data blocks. The resultant data blocks are cut down to standard size by discarding samples (21) and applied to a matched filter (23) for further standard information processing.