초록 ▼

The invention relates to a data transmission method used in a CDMA-type radio system. A base station and terminal equipments exchange data at least in a packet switched mode, and a terminal equipment transmits to the base station on a random access channel a random access signal comprising at least

The invention relates to a data transmission method used in a CDMA-type radio system. A base station and terminal equipments exchange data at least in a packet switched mode, and a terminal equipment transmits to the base station on a random access channel a random access signal comprising at least a preamble (100) and a data part (102) multiplied by a spreading code. A predetermined set of spreading codes and signature sequences (104) are stored in the terminal equipment, and each signature sequence (104) determines one spreading code. The terminal equipment selects one signature sequence (104) by a random process from the set of signature sequences and adds the selected signature sequence (104) to the preamble (100) of the random access signal. Further, the terminal equipment uses the spreading code corresponding to the selected signature sequence (104) in the data part (102) of the random access signal. Interference cancellation is performed at the base station according to the signature sequence (104) of the preamble (100) of the received random access signal, such that at least the interference caused by the received data part (102) is eliminated from at least one other received signal in order to improve detection.

대표청구항 ▼

The invention relates to a data transmission method used in a CDMA-type radio system. A base station and terminal equipments exchange data at least in a packet switched mode, and a terminal equipment transmits to the base station on a random access channel a random access signal comprising at least

The invention relates to a data transmission method used in a CDMA-type radio system. A base station and terminal equipments exchange data at least in a packet switched mode, and a terminal equipment transmits to the base station on a random access channel a random access signal comprising at least a preamble (100) and a data part (102) multiplied by a spreading code. A predetermined set of spreading codes and signature sequences (104) are stored in the terminal equipment, and each signature sequence (104) determines one spreading code. The terminal equipment selects one signature sequence (104) by a random process from the set of signature sequences and adds the selected signature sequence (104) to the preamble (100) of the random access signal. Further, the terminal equipment uses the spreading code corresponding to the selected signature sequence (104) in the data part (102) of the random access signal. Interference cancellation is performed at the base station according to the signature sequence (104) of the preamble (100) of the received random access signal, such that at least the interference caused by the received data part (102) is eliminated from at least one other received signal in order to improve detection. ut before it can next be sent; a displacement queue, in which found messages to be displaced are stored; means for setting, if a message is placed in the displacement queue, an information element in a message indicating that the number of additional frames is to be read; and means for assigning messages to a frame according to a predetermined order of logical channels, including any displaced messages that fit in the frame. 8. The apparatus of claim 7, wherein the displacement queue has a length that is based on a maximum number of messages that can be sent in the logical channel and the number of additional frames to be read. 9. The apparatus of claim 8, wherein the number of additional frames to be read is one and the length is three. 10. The apparatus of claim 7, wherein the predetermined order of logical channels is undisplaced messages, other messages, and displaced messages. 11. The apparatus of claim 7, wherein displaced messages included in the frame are removed from the displacement queue, and displaced messages left in the displacement queue are deleted and a respective notification message is sent for each deleted displaced message. of an LTU; determining whether the current count is an odd number or an even number; filling, when the current count is an odd number, a LTU payload with multiplex sublayer protocol data units (MuxPDUs) beginning at a starting point of the LTU, calculating Cyclic Redundancy Code (CRC) bits using the MuxPDUs filling the LTU payload, and attaching the calculated CRC bits after the LTU payload; and reserving, when the current count is an even number, a blank field corresponding to a size of calculated CRC bits beginning at the starting point of the LTU, filling MuxPDUs in a LTU payload starting after the blank, calculating the CRC bits using the MuxPDUs in the payload, and inserting the calculated CRC bits in the blank before the LTU payload. 8. A method for de-assembling logical transmission units (LTUs) in a communication system having a physical channel frame including a plurality of LTUs, with a physical layer Cyclic Redundancy Code (CRC) field, each said LTU including a payload and a LTU CRC field for detecting errors in the payload, the method comprising the steps of: (a) defining a payload beginning at a starting point of an LTU for an odd-numbered LTU, and performing error checking using a LTU CRC field attached after the payload; (b) defining a payload beginning after a reserved blank in an LTU for an even-numbered LTU, and performing error checking using a LTU CRC field inserted in the reserved blank before the payload; and (c) separating multiplex sublayer protocol data units (MuxPDUs) from the payload of the LTU, if no errors are detected; then separating out data blocks from said each MuxPDU; and transmitting the separated data blocks to an upper layer entity. 9. The method as claimed in claim 8, wherein step (a) further comprises the steps of: determining whether a physical layer frame has passed physical layer CRC checking; performing step (c) if the physical layer frame has passed physical layer CRC checking; and generating, if the physical layer frame has failed physical layer CRC checking, LTU CRC bits using the payload, comparing the generated LTU CRC bits with the LTU CRC bits attached after the payload; and performing step (c) if the CRC bits are identical to each other, and discarding the LTU if the CRC bits are different from each other. 10. The method as claimed in claim 8, wherein step (b) further comprises the steps of: determining whether a physical layer frame has passed physical layer CRC checking; performing step (c) if the physical layer frame has passed physical layer CRC checking; and generating, if the physical layer frame has failed physical layer CRC checking, LTU CRC bits using the payload; comparing the generated LTU CRC bits with the LTU CRC bits attached before the payload; and performing step (c) if the CRC bits are identical to each other, and discarding the LTU if the CRC bits are different from each other. 11. The method as claimed in claim 8, wherein the LTU CRC field is comprised of 12 bits. 12. A device for assembling logical transmission units (LTUs) in a CDMA communication system having a physical channel frame including a plurality of LTUs, with a physical layer Cyclic Redundancy Code (CRC) field and tail bits arranged after the LTUs, said each LTU including a payload and a LTU CRC for detecting errors in the payload, the device comprising: a means for arranging LTU CRC fields included in odd-numbered LTUs after the LTU payload and for arranging LTU CRC fields included in even-numbered LTUs before the LTU payload, so as to generate a physical channel frame payload in such a manner that a LTU CRC field of an even-numbered LTU and a LTU CRC field of an odd-numbered LTU is adjacent to said even-numbered LTU; and a supplemental channel element for calculating the physical layer CRC field, for attaching the calculated physical layer CRC field to a physical channel frame payload received from the means for arranging LTU CRC fields; for attaching tail bits t