JP2005318135A - Encoding/decoding function control system and base station device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base station device capable of reducing the waste of signal processing resources by realizing effective utilization of a signal encoder/decoder. <P>SOLUTION: The assignment state of the encoding function/decoding function in the signal encoder/decoder 411 is dynamically executed corresponding to the allocation state of radio resources of an up-link and a down-link. Consequently, the signal encoder/decoder can be effectively utilized to the utmost by avoiding the restriction to make the assignment beyond an upper limit impossible when the number of the conventionally fixed assignments of one of the encoder and the decoder reaches the upper limit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an encoding / decoding function control system and a base station apparatus using the same, and more particularly to a signal encoding / decoding function switching control method in a base station apparatus in a W-CDMA mobile communication system.

  In mobile communication systems, the importance of packet communication traffic has increased, and as a result, the amount of downlink data has increased in uplink / downlink radio resources (radio resources necessary for transmitting user data). The tendency to become larger than the direction has increased. In addition, in W-CDMA (Wideband-Code Division Multiple Access) systems that are currently in operation, the introduction of HSDPA (High Speed Downlink Packet Access) is planned in recent years. By allocating a dedicated physical channel that shares a line among a plurality of mobile stations, it is expected that the conventional dedicated channel will have a smaller downlink radio resource than in the uplink direction.

  Furthermore, since the presence or absence of the above-mentioned HSDPA adaptation differs depending on the situation of the installed base station apparatus, and thus the tendency of user traffic also differs. It is desired that a signal processing resource corresponding to the above be able to be switched flexibly instead of being fixedly allocated.

  More specifically, voice communication has been mainly performed in the past, and uplink / downlink data transmission rates have been the same, but recently data communication has become mainstream. Further, in Web communication typified by i-mode (registered trademark), the data amount in the downstream direction due to download is larger than that in the upstream direction. Furthermore, by introducing the above HSDPA method, the downlink signal in the packet communication is assigned to the physical channel dedicated to HSDPA, so that the uplink signal may be larger as the signal amount of the individual channel.

  However, since this ratio varies depending on the call ratio of voice / packet communication and the contents of packet communication (e-mail, Web communication, etc.), quantification is difficult. Therefore, in the method having fixedly upstream and downstream signal processing resources, resources cannot be effectively allocated to the fluctuation of the ratio, so there is a surplus, and the scale of the infrastructure facility is increased. Therefore, a system that effectively uses signal processing resources is desired.

  Here, referring to FIG. 4, a system configuration of the W-CDMA mobile communication system is simply shown. Downlink radio waves DL1 and DL2 transmitted from the base station apparatus 1 can be received in the cell 4 by the mobile devices 2 and 3 as mobile communication terminals, and conversely, the uplink radio waves UL1 transmitted by the mobile devices 2 and 3 , UL2 is received by the base station apparatus 1, whereby bidirectional communication becomes possible. Actually, there are many mobile devices in the cell 4, and adjacent service areas are in contact with each other across the boundary, so that a mobile communication service by a large number of mobile devices can be provided over a wide range by combining the multiple service areas. It is possible.

  FIG. 5 shows a functional block configuration and signal flow in the base station apparatus 1. The uplink radio signal received from the radio side (mobile device side) is amplified by the radio transmission / reception amplification unit 70, quantized by the radio transmission / reception unit 60, and sent to the signal processing unit 40 via the second switch unit 50. It is done.

  In the signal processing unit 40, a desired signal is extracted from the quantized radio signal and decoded, and then wired in a predetermined format from the transmission path interface unit 10 via the first switch unit 20. It is converted into a signal and transmitted to the wired side (network side).

  Conversely, the downstream wired signal received from the wired side is converted into a device internal signal by the transmission path interface unit 10 and input to the signal processing unit 40 via the first switch unit 20. An encoding process is performed in the signal processing unit 40, a spreading process is performed in the radio transmission / reception unit 60 via the second switch unit 50, a signal is amplified in the radio transmission / reception amplification unit 70, and transmitted as a radio signal. The

  The signal processing units 40, 41, and 42 and the radio transmission / reception units 60, 61, and 62 shown in FIG. 5 can be implemented in a plurality according to the amount of traffic accommodated by the base station. The selection information is set to each functional block by the central control unit 30.

  FIG. 6 shows conventional functional blocks in the signal processing units 40, 41, and 42. As shown in FIG. Based on the uplink quantized signal from the radio side (50), the path detection unit 406 detects the path timing of the received signal and rakes the multiple path signal, and the received signal decoding unit 404 performs error correction decoding. Reception data is generated. Then, the transmission data is loaded into a predetermined format by the wired signal transmission unit 401 and transmitted to the wired side. Further, the downlink signal from the wired side (20) is extracted from the transmission data by the wired signal receiving unit 402, is subjected to error correction coding by the transmission signal encoding unit 405, and is transmitted to the wireless side (50). The

  FIG. 7 shows the configuration of the reception signal decoding unit 404 and the transmission signal encoding unit 405. Each includes a plurality of decoding units and coding units (shown as # 1 to #k). Allocation and release of the plurality of decoding units and coding units are independent, and are performed according to an instruction from the control unit 403. Also, a number of allocations and releases according to the transmission rate of user data is performed.

  In this way, since the encoding unit and the decoding unit are physically independent, when either one of the number of allocations reaches the upper limit, the allocation becomes impossible, so there is a remainder in the encoding unit or the decoding unit. It will occur. FIG. 8 shows an example. For example, three users (referred to as # 1 to # 3) are allocated, and user # 1 has one coding unit, one decoding unit, user 2 has two coding units, one decoding unit, A state in which the user 3 uses three code units and one decoding unit is shown. At this time, since the reception signal encoding unit 405 has no free code unit, it is impossible to newly allocate the remaining three decoding units, and hardware resources that are signal processing resources are wasted. To do. Note that the distribution and synthesis of signals for each user shown in FIG. 8 is performed by a time division method.

Reference 1 discloses a configuration in which both signal coding and decoding functions are built in one hardware, and these functions are selected and used as necessary.
JP 2000-295309 A

  The conventional base station apparatus configurations shown in FIGS. 5 to 8 have a problem that, as described above, waste occurs in the encoding unit and decoding unit, making it impossible to effectively use signal processing resources. Patent Document 1 is a technology that can flexibly cope with a system change for a single encoding / decoding device. In order to effectively use signal processing resources corresponding to radio resources in a radio channel, There is no mention of how to use it.

  An object of the present invention is to provide a coding / decoding control system and a base station apparatus using the coding / decoding control system that can effectively use a signal coding / decoding unit and eliminate waste of signal processing resources.

  An encoding / decoding control system according to the present invention is an encoding / decoding control system in a communication device having a signal encoding function and a decoding function for a radio channel, and a plurality of encoding / decoding units having the encoding function and the decoding function; And a control unit that dynamically selects and controls each function of the encoding / decoding unit according to a radio resource allocation state of the radio channel.

  A base station apparatus according to the present invention is a base station apparatus connected to a mobile communication terminal via a radio channel, and includes a plurality of code / decoding units having a signal encoding function and a decoding function for the radio channel, And a control unit that dynamically selects and controls each function of the encoding / decoding unit according to a radio resource allocation state.

  The operation of the present invention will be described. One of the code unit / decoding unit, which has been fixed in the past, by dynamically allocating the coding function / decoding function in the signal coding / decoding unit according to the allocation state of the uplink / downlink radio resources When the number of allocations reaches the upper limit, the restriction that prohibits further allocation is avoided, and the signal encoding / decoding unit can be used as effectively as possible.

  By providing multiple encoders / decoders that can select either encoding / decoding functions, we are aware of the imbalance in the number of encoder / decoders used due to asymmetric data transmission rates on the uplink / downlink. Thus, the encoding / decoding unit can be used up to the upper limit number, and as a result, the signal processing resource can be effectively used.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and the same parts as those in FIG. 6 are denoted by the same reference numerals. Also in the present embodiment, the system configuration of FIG. 4 is applied, and the schematic functional blocks of the base station apparatus 1 are the same as those of FIG.

  In FIG. 1, the signal processing unit 40 according to the embodiment of the present invention includes a reception signal decoding unit 404 and a transmission signal encoding unit 405 in the conventional signal processing unit in FIG. It is a summary. A switching unit 410 that switches the signal encoding / decoding unit 411 under the control of the control unit 403 is provided. Other configurations are the same as the example of FIG. Note that the signal processing unit 40 in FIG. 1 is similarly applied to the other signal processing units 41 and 42.

  As shown in FIG. 2, the signal encoding / decoding unit 411 has both encoding / decoding functions, and a plurality of encoding / decoding units (# 1 to # 1) from which one of these functions can be selected. (indicated by k) and provided in parallel. The control unit 403 instructs allocation / release and the number of encoding / decoding units according to the transmission rate, and the switching unit 410 receiving the instruction determines whether the signal encoding / decoding unit 411 is to be allocated / released. The code / decoding unit and the code / decoding function selection are instructed.

  FIG. 3 shows a case where an assignment state similar to the assignment state shown in FIG. 8 occurs in such a configuration. It can be seen that the remaining three encoding / decoding units (# 10 to # 12) can be allocated to new users.

  As shown in FIG. 3, by providing a plurality of encoding / decoding units that can select either of the encoding / decoding processing functions, the transmission / reception rate of the encoding / decoding unit is increased due to the transmission rate of uplink / downlink data becoming asymmetric. These code / decoding functional blocks can be used up to the upper limit without being aware of the imbalance in the number of uses.

  The above-described embodiment is suitable for use in a base station apparatus of a W-CDMA mobile communication system, but is also applicable to other mobile communication systems.

It is a block diagram which shows embodiment of this invention. It is a figure which shows the specific example of the signal encoding / decoding part of FIG. It is a figure which shows the example of the allocation state of the encoding / decoding function according to the data transmission rate of a radio | wireless line. 1 is a schematic system diagram of a mobile communication system to which an embodiment of the present invention is applied. It is a block diagram which shows the structure of the base station apparatus of FIG. It is a block diagram which shows the conventional structure of the signal processing part of FIG. (A) is a figure which shows the structural example of the received signal decoding part 404 of FIG. 6, (B) is a figure which shows the structural example of the transmission signal encoding part 405 of FIG. FIG. 8 is a diagram illustrating an example of an allocation state of an encoding unit and a decoding unit according to the transfer rate of user data in the configuration of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base station apparatus 2, 3 Mobile device 4 Cell 40-42 Signal processing part 60-62 Wireless transmission / reception part 401 Wired signal transmission part 402 Wired signal reception part 403 Control part 406 Path | pass detection part 410 Switching part 411 Signal encoding / decoding part

Claims (7)

  A coding / decoding control system in a communication device having a coding function and a decoding function of a signal with respect to a radio channel, wherein a plurality of coding / decoding units having the coding function and the decoding function, and a radio resource allocation state of the radio channel And a control unit that dynamically selects and controls each function of the encoding / decoding unit.   The encoding / decoding function control system according to claim 1, wherein the control unit performs selection control of each function of the encoding / decoding unit according to a data transfer rate in the radio resource.   3. The control unit according to claim 2, wherein when the data transfer rate of the downlink is larger than that of the uplink, the control unit selects more coding functions of the coding / decoding unit than the decoding function. Encoding / decoding function control system.   A base station apparatus connected to a mobile communication terminal by a radio channel, a plurality of encoding / decoding units having a signal encoding function and a decoding function for a radio channel, and the radio resource allocation state according to the radio resource allocation state And a control unit that dynamically selects and controls each function of the encoding / decoding unit.   The base station apparatus according to claim 4, wherein the control unit performs selection control of each function of the encoding / decoding unit according to a data transfer rate in the radio resource.   6. The control unit according to claim 5, wherein when the data transfer rate of the downlink is larger than that of the uplink, the control unit selects more coding functions of the coding / decoding unit than the decoding function. Base station equipment. The base station apparatus according to claim 4, wherein the base station apparatus is used in a W-CDMA mobile communication system.

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