Abstract:
A mobile telephone network operating general packet radio service includes a base station (2) and a group of mobile telephones (M1 to M4). The base station (2) includes a control unit (8) which generates a succession of data packets which are transmitted along a common downlink to all the mobiles (M1 to M8). Each data packet includes a header section containing an uplink state flag identifying a first selected mobile, to poll that mobile and cause it to return a packet of data to the base station along a common uplink channel. The header also includes an uplink state flag identifying a second selected mobile and is accompanied by the identity of and time slot for a second auxiliary uplink channel for polling the second mobile to cause the second mobile to return a packet of data to the base station along said auxiliary uplink channel thereby enabling the polling of at least two mobiles using the same data packet. The polling sequence produced by the control unit (8) ensures that each mobile is polled twice during each polling cycle, once accompanied with the identity of and time slot for a secondary auxiliary uplink channel and once without.
Abstract:
There is disclosed a method, and circuit to implement the method, of estimating the timing position of a received signal in a mobile communications system. The method includes the steps of: correlating the received signal with an expected sequence; determining the m successive correlation results having the highest correlation; determining the n successive correlations of the m correlations having the highest correlation, where n
Abstract:
A mobile telephone network operating general packet radio service includes a base station (2) and a group of mobile telephones (M1 to M4). The base station (2) includes a control unit (8) which generates a succession of data packets which are transmitted along a common downlink to all the mobiles (M1 to M8). Each data packet includes a header section containing an uplink state flag (USF1) identifying a first selected mobile, to poll that mobile and cause it to return a packet of data to the base station along a common uplink channel. The header also includes an uplink state flag (USF2) identifying a second selected mobile and is accompanied by the identity of and time slot for a second auxiliary uplink channel for polling the second mobile to cause the second mobile to return a packet of data to the base station along said auxiliary uplink channel thereby enabling the polling of at least two mobiles using the same data packet. The polling sequence produced by the control unit (8) ensures that each mobile is polled twice during each polling cycle, once accompanied with the identity of and time slot for a secondary auxiliary uplink channel and once without.
Abstract:
There is disclosed a method of approximating the result of the multiplication of a truncated convolution matrix by its transpose. The method comprises determining at least one value in each diagonal of the matrix and setting all values in each diagonal in dependence on the at least one value to thereby create an approximated matrix product.
Abstract:
A packet radio network for communicating between a first user terminal and a second terminal which is a mobile terminal. The network is responsive to an indication that voice service us required, to communicate over a radio link on the uplink between a base station and a mobile terminal in data blocks of fixed length. Each block contains a flag indicating whether the payload is speech or silence. A radio channel is dedicated for uplink communication between the mobile terminal and a base station as long as the flag indicates that the payload is speech. After the base station receives a flag indicating that the payload is silence, the base station polls the mobile station dynamically, indicating in what radio channel the mobile station should send its next data block. This facilitates rapid allocation of a radio channel when there is speech to send.
Abstract:
There is disclosed a packet radio network providing communications in channels allocated on up and down links between a base station and user terminals. In periods following a time when the user terminal has no user data to transmit on the up link, the base station reuses the up link channel for data communication with another user terminal and polls the user terminal repeatedly to determine whether it has user data to transmit. This invention introduces a new access procedure suitable for real-time services, and can be applied to any packet radio network.
Abstract:
A mobile telephone network operating general packet radio service includes a base station (2) and a group of mobile telephones (M1 to M8). The base station (2) includes a control unit which generates a succession of data packets which are transmitted along a common downlink to all the mobiles (M1 to M8). Each data packet includes a header section containing an uplink state flag identifying a first selected mobile, to poll that mobile and cause it to return a packet of data to the base station along a common downlink channel. The header also includes an uplink state flag identifying a second selected mobile and is accompanied by the identity of and time slot for a second auxiliary uplink channel for polling the second mobile to cause the second mobile to return a packet of data to the base station along said auxiliary uplink channel thereby enabling the polling of at least two mobiles using the same data packet.