Abstract: In a CDMA network, each mobile is arranged to combined pilot symbols from its dedicated pilot channel with pilot symbols from at least one common channel as an input to its channel impulse response sensing means. The common channel may be a BCH, a FACH or a PCH, and the pilot symbols on all such channels may be combined. The pilot energy required on each dedicated pilot channel can thereby be reduced. By communicating the quality of the received pilot symbols to a base station, the base station can reduce the energy on the dedicated pilot channel, providing a yet further saving of energy.

Abstract: Battery operated user equipment is disclosed for use in a radio telecommunications network, including means for monitoring the state of charge of the battery and means for communicating state of charge data to a base station during call set up. The battery data can be used to inform a caller that, for example, a called user's apparatus has reduced or limited battery capacity and thus that the expected duration of a call is limited.

Abstract: In a UMTS, the AICH is arranged to send, in addition to a signal acknowledging that a preamble from a mobile is at an acceptable strength, an additional signal indicating that the mobile is not currently permitted to send its message; this may apply when the BTS does not have hardware resources available. If the BTS can predict when the hardware will become available, the additional signal can include a time out (T) after which the mobile system can send its message signal.

Abstract: A method is provided of detecting one of a set of preamble sequences in a spread signal. The method includes: (a) correlating the received spread signal with sequences of a first orthogonal Gold code (OGC) set in accordance with a first fast transform to provide a preamble signal; (b) correlating the preamble signal with the set of preamble sequences in accordance with a second fast transform to generate a set of index values; (c) forming a decision statistic based on the set of index values: and (d) selecting, as the detected one of the set of preamble sequences, a preamble sequence corresponding to the decision statistic.

Abstract: A mobile for use in the UMTS is arranged, on activation to read the Broadcast Control Channel (BCCH) for all available preamble signatures; to store the signatures in its processor; to read the Acquisition Indication Channel (AICH) for acquisition indicators sent to other mobiles; to store usage of other mobiles against each signature; and to select when required a signature the recorded usage of which is unlikely to cause collisions.

Abstract: In a data packet, e.g. a PDU of the UMTS, a length indicator field of variable granularity is created, depending on the exact length of the payload to be transmitted. An additional field is provided, a single bit in length, to indicate the granularity of the length indicator field. This increases the resolution of the header, whilst keeping low an overhead of extra field bits. The method comprises: assessing the length of the data to determine the appropriate units, from a plurality of possible units, in which the length should be expressed; setting the granularity field to define the appropriate units in which the length of the data is to be indicated; and setting the length indicator field to indicate the data length.

Abstract: In a UMTS system, the AICH is arranged to send, in addition to signals acknowledging that a preamble (164) from a mobile (12) is at an acceptable strength, further signals (171, 176) acknowledging message signals (168, 178) from the mobile. Preferably the further signal (171) is a negative acknowledgement signal, indicating that a message (168) is corrupted. Application of the invention avoids the involvement of layer (2) in message acknowledgement.

Abstract: In the Universal Mobile Telecommunications System, a method of transport format combination selection is provided for directing data units for transmission from a buffer in the RLC layer to transport channels in the MAC layer. The method includes providing a set of information channels in the RLC layer for connection to the buffer and a set of transport channels in the MAC layer for transmission of the data units, selecting a subset of the information channels and a subset of the transport channels for interconnection, and selecting for each transport channel one or more information channels to be multiplexed on the transport channel. A mapping table and a transport block combination table are created as a result of prioritizing the selected transport channels according to a predetermined scheme in dependence on the characteristics of the information channels and then there from, determining the number of data units which may be transmitted in a timing interval.

Abstract: A practical and efficient persistency control for the Universal Mobile Telecommunications System, comprising determining a persistency value for making random transmissions for access to the system, the method comprising: 1. determining for a system cell, the maximum allowable user equipment transmission power PMAX; 2. assessing the number in a current time interval of ongoing packet transmissions NCURRENT based upon a fraction &agr; of user equipment measured current transmission power Ptotal; 3. assessing the power available in a next time interval based upon the maximum allowable transmission power and the current transmission power, and determining therefrom a number of allowable new packets NNEXT in the next time interval; and 4. determining a persistency value p for transmission to user equipment in said cell, being a function of the number of ongoing packet transmissions NCURRENT and the number of allowable new packets NNEXT.

Abstract: A cellular mobile telephone network is disclosed in which a mobile station requests service in data modulated on a common random access channel (RACH) in a format associated with first a cell in which the mobile station is located. Base stations in cells neighbouring the first cell, are configured to demodulate the RACH message burst having the format associated with the first cell, and to pass the demodulated data to a radio network controller (RNC). This enables the average power required for a successful RACH transmission to be reduced.

Abstract: Battery operated user equipment is disclosed for use in a radio telecommunications network, including means for monitoring the state of charge of the battery and means for communicating state of charge data to a base station during call set up.

Abstract: Battery operated user equipment is disclosed for use in a radio telecommunications network, including means for monitoring the state of charge of the battery and means for communicating state of charge data to a base station during call set up.

Abstract: A cellular radio telecommunications network is disclosed in which the new base station responds to information from the radio network controller to send downlink data to the mobile station only after it has received an uplink frame therefrom. This provides faster radio link set up, less interference and a smoother switch on of communications with the new Node B.

Abstract: User equipment is disclosed which is responsive to instructions from an existing base station, to begin transmissions to a second base station specified in the instructions, without waiting for receipt of down link communications from the second base station.

Abstract: A cellular mobile telephone network is disclosed in which a mobile station requests service in data modulated on a common random access channel (RACH) in a format associated with first a cell in which the mobile station is located. Base stations in cells neighbouring the first cell, are configured to demodulate the RACH message burst having the format associated with the first cell, and to pass the demodulated data to a radio network controller (RNC). This enables the average power required for a successful RACH transmission to be reduced.

Abstract: A receiver in a code-division, multiple-access (CDMA) communication system employs a preamble detector for random access channels (e.g., RACHs). RACHs may use orthogonal Gold code (OGC) sequences for preamble signature sequences and/or spreading of the preamble signature sequence with OGC sequences. A preamble detector may employ a fast orthogonal Gold transform (FOGT) for both despreading (e.g., correlation with code numbers C1, . . . , C256)) and for generating a decision statistic for detecting (identifying) the signature sequence used in the preamble. The spread signal of the RACH is applied to a code matched filter (CMF) matched to the spreading OGC sequence and the output signal of the CMF is sampled at the symbol rate. A fast Hadamaard transform (FHT) is applied to the sampled output of the CMF, and the exemplary 16th order code-words of the FHT match the 16 Walsh signature sequences employed to distinguish user channels transmitted by user equipment.