Abstract: A convolutional encoder (50) comprises an expurgation unit (22) and a first component convolutional encoder section (24). A convolutional turbo encoder (20) comprises an expurgation unit (22); a first component convolutional encoder section (24); a second component convolutional encoder section (26); and an interleaver (28). For both the convolutional encoder (50) and the expurgating convolutional turbo encoder (20) the expurgation unit (22) inserts predetermined values at selected bit positions of an input bit sequence and thereby provide an expurgated input bit sequence. A lower rate convolutional code is obtained from a higher rate code via expurgation.

Abstract: Method and apparatus for generating a set of generator polynomials for use as a tail biting convolutional code to operate on data transmitted over a channel comprises: (0) specifying a constraint and a low code rate for a tail biting convolutional code, where the low rate code is lower than 1/n (n being an integer greater than 4); (1) selecting valid combinations of generator polynomials to include in a pool of potential codes, each valid combination being a potential code of the low rate code; (2) determining first lines of a weight spectrum for each potential code in the pool and including potential codes of the pool having best first lines in a candidate set; (3) determining best codes of the candidate set based on the first L number of lines in the weight spectrum; (4) selecting an optimum code(s) from the best codes; and (5) configuring a circuit(s) of a data transceiver to implement the optimum code(s).

Abstract: In a cellular communication system where two mobile stations are located within or near to a cell associated with a base station, one or more relay stations with good radio link quality relative to the two mobiles may be used to build a local forwarding communication link between the mobile stations using the one or more relay stations which avoids downlink/uplink transmission with the base station. The relay station(s) is(are) selected based on an association between two mobile stations and the relay station(s).

Abstract: A communications network comprises a base station (28) and a wireless terminal (30) which communicate a frame (F) of information over an air interface (32). The frame (F) is prepared or processed to accommodate duration-shortened symbols. The preparation or processing the frame occurs in a manner whereby: (1) at least some of OFDM symbols of the frame have a symbol duration Tbase in accordance with a base frequency 1/Tbase of subcarriers employed for the frame; and (2) at least one duration-shortened OFDM symbol of the frame has a symbol duration Tbase/N, wherein N is an integer greater than one and wherein a subset of subcarriers are utilized for the select OFDM symbol, the subset of subcarriers being frequencies which are integer multiples of a Nth harmonic of the base frequency 1/Tbase. In an example embodiment, the duration-shortened symbol is inserted in a portion of the frame corresponding to a transition gap for at least one version of the frame.

Abstract: The invention operates to determine a measure of one or more input data parameters, such as input data rate and input data buffer fill at the beginning of a data burst. The invention then proceeds to the selection of an operating data rate for the data burst as a function of the input data parameter measures. In a further step, the invention proceeds to a selection of a duration for the data burst as a function of the selected operating data rate and an end-of-burst data residue parameter.

Abstract: In a system of communication, a sending node sends a message to a receiving node, which NAKs unsuccessful transmissions. The sending node screens the NAKs to determine if they were sent before the receiver could receive previous transmissions of the same data NAKed. One screening technique is based on an estimated round trip time of a message. Another alternate technique looks a flag in the NAK that synchronizes the sender and the receiver.

Abstract: ntion is directed to the management of data burst requests. In iethod of the invention operates to determine a measure of one or parameters, which in an advantageous embodiment are the input z amount of data available in the input data buffer at the beginning t. The invention then proceeds to the selection of an operating data burst as a function of the input data parameter measures. In an nbodiment, the operating data rate is determined by computing the red data rate as a function of the input data rate and the data content fer at the beginning of the data burst, with the operating data rate lowest supported system data rate that is equal to or greater than the ed data rate. In a further step, the invention proceeds to a selection r the data burst from the burst durations supported by the wireless ction of the selected operating data rate and an end-of-burst data er.

Abstract: The invention provides a novel burst duration assignment process that increases the performance and improves the throughput of communication systems. In particular, the invention provides an optimal burst duration assignment methodology such that resources are efficiently utilized and maximized in a communication system such as a code division multiple access (CDMA) system. According to the invention, burst duration is assigned based on channel fading fluctuation and user mobility in the communication system. In general, shorter burst duration is assigned to users with higher fading fluctuation and high mobility. Longer burst duration is assigned to users with lower fading fluctuation and low mobility. In a particular embodiment of the invention, the burst assignment is based on a function of duration versus fluctuation.

Abstract: The invention provides a novel methodology for increasing the performance of CDMA systems with packet data services by accommodating a variety of users with different rates. The invention operates to increase the spectrum efficiency of a wireless system by using an optimal transmission set of base transceiver stations and assigning proper data rates to efficiently utilize the radio resources. In particular, the invention operates to decrease interference so that the quality of data transmission in CDMA systems is advantageously maintained. Moreover, the invention operates to increase the allocation of bandwidth, particularly for high-speed data services. The invention provides a methodology to evaluate the data rates of different combinations of BTSs that may be in connection with a particular mobile station (MS), allocate an appropriate data rate for the MS and make allocation of system resources more efficient in a multi-user environment.

Abstract: In a system of communication, a sending node sends a message to a receiving node, which NAKs unsuccessful transmissions. The sending node screens the NAKs to determine if they were sent before the receiver could receive previous transmissions of the same data NAKed. One screening technique is based on an estimated round trip time of a message. Another alternate technique looks a flag in the NAK that synchronizes the sender and the receiver.