JP2005150827A - Radio base station apparatus and packet transmission method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio base station apparatus for combining packets to continuously process data, and to provide a packet transmission method thereof. <P>SOLUTION: The radio base station combines packet data to generate PDUs, when continuously receiving packets. When the consecutively transmitted packet data are stored in an FIFO and in a state of generating the PDUs, the base station apparatus can combine the packet data between a first packet and a succeeding packet at production of final PDU of the first packet, without applying padding to each packet, unlike the existing circuitry. Further, since the base station apparatus requires a plurality of packet data information items which have not been required in the existing method, HDs (headers) at combination have two packet data information items or more at the same time. Proper HD information can be attached to the headers by storing the packet data information items, when data are written to the FIFO. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packet data processing method of a radio base station apparatus in mobile communication.

  In recent years, radio base station apparatuses and mobile terminals in mobile communication are evolving day by day in order to enable comfortable use by users. As a future prospect of the radio base station apparatus, it aims to realize a compact radio base station apparatus that can perform high-speed information processing.

Also, a packet communication method that eliminates redundant information of header portions of a plurality of communication packets and connects them to form a header portion of a transmission frame, and connects payload portions of a plurality of communication packets to form a payload portion of a transmission frame (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 10-247942

  However, in order to improve the functions based on the technology of the existing radio base station apparatus for realizing these, two major factors can be considered as countermeasures.

  The first comes from device evolution. As device evolution has enabled high-density design, existing circuits can be integrated and processing power can be achieved in a compact manner.

  The second is a review of the processing method of the radio base station apparatus. This can be realized by devising an existing processing method.

  The former solution largely depends on device evolution.

  Therefore, an object of the present invention is to provide a radio base station apparatus that continuously processes data by combining packets in order to realize the latter countermeasure and its packet transmission method.

  In order to solve the above-described problems, the present invention includes a wireless unit that transmits and receives radio signals to and from a mobile terminal, a baseband signal processing unit that processes baseband signals, and a transmission path interface unit that transmits and receives signals to and from a network. In the radio base station apparatus, the baseband signal processing unit includes a transmission baseband signal processing unit that processes the transmission signal transmitted from the transmission path interface unit and transmits the processed signal to the radio unit. The transmission baseband signal processing unit includes a FIFO for storing a transmission signal transmitted from the transmission path interface unit, and a packet is continuously generated when the data read from the FIFO is divided into PDU formats to generate a PDU. And a PDU generation unit that generates PDUs by concatenating packet data when input. To.

  With the above configuration, the processing time for packet generation can be shortened.

  In the present invention, by applying a new processing method to the packet data transmission method of the existing radio base station apparatus, more data can be transmitted without changing the configuration of the apparatus. By realizing the present invention, the processing time of packet data transmission can be greatly shortened when there is a lot of user access, leading to an improvement in the capabilities of the entire radio base station apparatus.

  Next, the best mode of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic block diagram of a radio base station apparatus according to the present invention. The antenna 1 transmits and receives RF signals between the radio base station apparatus 2 and the mobile terminal.

  The transmission / reception amplification unit 10 of the RF unit (radio unit) 4 is equipped with a transmission amplifier that amplifies the transmission RF signal and a low noise amplifier that amplifies the reception RF signal, demultiplexes the RF transmission signal and the RF reception signal, Connecting. The radio signal processing unit 11 D / A converts the baseband digital data signal from the baseband signal processing unit 5, removes the high frequency component, and converts it into an RF signal by direct modulation. The received signal from the transmission / reception amplification unit 10 is subjected to direct detection, converted into digital data by an A / D converter, and transmitted to the baseband signal processing unit 5.

  The baseband signal processing unit 5 includes a reception baseband signal processing unit 12 and a transmission baseband processing unit 14. The reception baseband signal processing unit 12 performs spreading code synchronization (path search), despreading, channel estimation, Rake combining, error correction decoding, data separation / multiplexing, inter-sector diversity combining, etc. on the signal received from the RF unit 4 Perform baseband signal processing. The transmission baseband signal processing unit 14 performs error correction coding, radio frame conversion, data modulation, and spread modulation, and transmits the processed signal to the RF unit 4.

  The transmission path interface unit 13 functions as a transmission path between the radio base station apparatus 2 and the radio network control apparatus 3.

  FIG. 2 is a block diagram showing the internal configuration of the transmission baseband signal processing unit 14 shown in FIG. First, the overall signal flow will be described. The transmission signal transmitted from the transmission path interface unit 13 is subjected to processing such as encoding and spreading by the transmission baseband signal processing unit 14 and transmitted to the radio signal processing unit 11.

  Next, the transmission baseband signal processing unit 14 will be described. The baseband signal processing unit 14 includes a transmission data control unit 150 and a modulation unit 151. A transmission signal transmitted from the transmission path interface unit 13 is stored in a FIFO (First In First Out) 152. The PDU generation unit 153 divides the data read from the FIFO 152 into a PDU format (Protocol Data Unit) to generate a PDU. The encoding unit 154 performs an encoding process on the baseband signal generated by the PDU. The spreading unit 155 spreads the encoded data and transmits it to the radio signal processing unit 11.

  The operation of the present invention will be described with reference to FIGS.

  FIG. 3 shows a FIFO 152 that stores packet data from the transmission path interface unit 13. Serial data is written to the FIFO 152 from the left in FIG. 3 using a 2f (Hz) clock. Writing to one address of the FIFO takes 2f (Hz) × 8 clocks. The serial data written to the FIFO is read with a clock of f (Hz) as 1-address-8-bit parallel data. At this time, the read time can be processed by 1/4 of the write time.

  FIG. 4 is an explanatory diagram showing a dividing method when packet data is divided into PDU format lengths. The packet data divided into PDU format lengths performs processing for reflecting the information such as the length of the divided data and the number of divided data in the HD (header) for each PDU. . The processing method so far is the same as the existing method and the present invention method. Next, the method of the present invention will be described in comparison with the existing method.

  First, the operation of the existing method will be described. The existing method performs PDU generation for each packet data. Consecutively transmitted packet data starts PDU generation of the next packet data after the processing of the first packet data is completed. As a result, every time one packet is processed, PDU generation is performed using padding (supplementary data).

  Next, the method of the present invention will be described. The system of the present invention generates PDUs by combining packet data when packets are continuously input. When the continuously transmitted packet data is stored in the FIFO of FIG. 3 and is ready for PDU generation, it is not padded for each packet as in the existing circuit, and the next PDU is generated when the final PDU of the first packet is generated. The packet data of these packets can be concatenated. Furthermore, since a plurality of pieces of packet data information that are not necessary in the existing method are required, the HD at the time of connection has two or more pieces of packet data information at the same time. This makes it possible to add accurate HD information by storing the data at the time of writing data to the FIFO of FIG.

  FIG. 4 shows a gain of time spent for processing generated by generating a PDU from packet data using the method of the present invention. The existing method performs PDU generation for each packet data. Therefore, supplementary data is used every time one packet is processed (when packet data is divided in the PDU format, data necessary for generating the last PDU is padded).

  In the method of the present invention, PDUs are generated by combining packet data when packets are continuously input. Therefore, it is not necessary to perform padding for each packet. Not padding for each packet leads to a reduction in processing time. That is, the effect is exhibited when packet data is continuously transmitted and in the state where the latter of the continuous packets can be generated as a PDU, that is, in the state stored in the FIFO shown in FIG.

  Based on the above, Table 1 shows an example of packet data in consideration of the time gain that is the largest in the method of the present invention. The FIFO write time and FIFO read time in Table 1 are calculated as follows. This is a calculated value when serial data is written with a 2 f (Hz) clock when writing to the FIFO of FIG. 3 and 8-bit parallel data is read with a f (Hz) clock when reading.

  When PDU generation is performed with the maximum packet data length (packet 2 in Table 1), when continuous packet data transmission is performed with the minimum packet data length (packet 1 in Table 1), it is represented in Table 1. Depending on the FIFO write time and FIFO read time, packet 1 can be written into the FIFO for 10 packets before packet 2 is read from the FIFO and PDU is generated. When the processing of packet data for 10 packets is performed according to the present invention, the processing time is reduced by about 10 PDUs compared to the existing processing. When this is replaced with the time axis, it can be seen that the effect is increased as the radio base station apparatus is crowded with much user access.

  Packet data processing is often used for signal processing related to communication. Since each packet data is meaningful data, it is the easiest and easy to process separately. However, the processing method that is conscious of combining packets as in the present invention is to process data continuously. The effect is very significant. Moreover, since the processing method is easy and the base station configuration can be realized as it is, it can be effectively used in any field.

It is a schematic block diagram of the radio base station apparatus of this invention. It is an internal block diagram of a transmission baseband signal processing unit. It is a figure showing FIFO. It is explanatory drawing of the PDU format length division | segmentation method of packet data.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna 2 Wireless base station apparatus 3 Wireless network control apparatus 4 RF part (wireless part)
5 Baseband signal processing unit 10 Transmission / reception amplification unit 11 Wireless signal processing unit 12 Reception baseband signal processing unit 13 Transmission path interface unit 14 Transmission baseband processing unit 150 Transmission data control unit 151 Modulation unit 152 FIFO
153 PDU generation unit 154 encoding unit 155 spreading unit

Claims (6)

In a radio base station apparatus having a radio unit for transmitting / receiving radio signals to / from a mobile terminal, a baseband signal processing unit for processing baseband signals, and a transmission path interface unit for transmitting / receiving signals to / from a network,
The baseband signal processing unit includes a transmission baseband signal processing unit that processes a transmission signal transmitted from the transmission path interface unit and transmits the processed signal to the radio unit,
The transmission baseband signal processing unit includes a FIFO for storing a transmission signal transmitted from the transmission path interface unit,
And a PDU generation unit that concatenates packet data and generates PDUs when packets are continuously input when data read from the FIFO is divided into PDU formats to generate PDUs. Base station device.   2. The radio base station apparatus according to claim 1, wherein when the packet data is concatenated, the header has two or more pieces of packet data information.   The radio base station apparatus according to claim 1 or 2, wherein serial data is written to the FIFO with a 2f (Hz) clock and 8-bit parallel data is read with an f (Hz) clock. A packet transmission method for a radio base station apparatus having a radio unit for transmitting / receiving radio signals to / from a mobile terminal, a baseband signal processing unit for processing baseband signals, and a transmission path interface unit for transmitting / receiving signals to / from a network,
In the process of processing the transmission signal transmitted from the transmission path interface unit and transmitting the processed signal to the radio unit, the read signal is read from the FIFO storing the transmission signal transmitted from the transmission path interface unit. A packet transmission method for a radio base station apparatus, wherein, when data is divided into PDU formats and PDUs are generated, packet data are concatenated to generate PDUs when packets are continuously input.   5. The packet transmission method for a radio base station apparatus according to claim 4, wherein when the packet data is connected, the header has two or more pieces of packet data information.   6. The packet transmission method for a radio base station apparatus according to claim 4, wherein serial data is written to the FIFO with a 2f (Hz) clock and 8-bit parallel data is read with an f (Hz) clock.

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