JP2008047993A - OFDM cellular radio control channel allocation method and base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allocate a radio resource corresponding to a margin to a control channel in addition to an average required radio resource in conventional radio control channel allocation. A frequency × time resource that could originally be allocated for data communication cannot be used in an unused state.
A resource to be allocated to a radio control channel is divided into a basic part determined for each superframe and an extended part that is reassigned as necessary in the basic part, and the basic part performs only the minimum necessary resource allocation. By not, radio resource allocation by the above margin is eliminated. In the basic part, an index to an extended part to which an additional radio resource is allocated when the transmission capacity of the radio control information is insufficient in the basic part alone is described. Thus, it has a two-stage radio control channel assignment.
[Selection] Figure 8

Description

  The present invention relates to a wireless communication system employing OFDM (Orthogonal Frequency Domain Mulplex) in wireless communication, and relates to a system for realizing cellular communication. According to the present technology, it is possible to reduce the overhead of a control channel necessary for transmitting data as compared with the conventional technology.

  Research and development of a wireless communication system employing OFDM is in progress. In OFDM, data to be transmitted is generated in the frequency domain, converted into a time domain signal by IFFT (Inverse Fast Fourier Transform), and transmitted as a radio signal. On the reception side, the original information is extracted by converting the signal from the time domain to the frequency domain by FFT (Fast Fourier Transform). When performing communication, in addition to a data channel for data transmission, an access channel for establishing an uplink link, a radio control channel for transmitting downlink and uplink control information, channel assignment and system A control channel such as a broadcast channel for notifying information is required.

IEEE 802.20, which is a standardization organization, proposes a radio scheme based on OFDM, and Non-Patent Document 1 defines the downlink radio control channel described above.
In 3GPP, which is a standardization organization, a radio scheme based on OFDM is proposed as LTE (Long Term Evolution). In Non-Patent Document 2, the above-described downlink radio control channel is defined.

  In 3GPP2 which is a standardization organization, a radio system based on OFDM is proposed as LBC (Loosely Backward Compatible). In Non-Patent Document 3, the above-described downlink radio control channel is defined.

  The radio control channel in the CDMA system and previous radio communication systems is always separated from the data channel by any one of time division, frequency division, and code division. For example, in the CDMA communication system, a plurality of channels can be transmitted simultaneously by spreading codes, and on the receiving side, necessary information can be extracted by despreading operations using specific codes. However, spreading codes assigned to control channels are determined in advance. ing. On the other hand, the third generation type mobile communication has been developed, and has changed to the direction of communication by placing all information on the IP. As a result of this trend, broadband has become common in next-generation communication using OFDM, and it has become necessary to exchange various types of information. For example, best effort data communication, for example, voice communication such as VoIP, for example, streaming information such as video.

  For this reason, instead of providing a dedicated dedicated line for the radio control channel, the radio control channel uses a part of the channel composed of OFDM, just like a normal data channel. Reduces the overhead due to the radio control channel generated from margin design by adaptively controlling the resource allocation of the radio control channel according to the number of radio channels required by each terminal, propagation path conditions, etc. A method has been proposed.

  For example, Non-Patent Document 1 describes a method of sending a radio control channel such as F-SSCH, which is a downlink control channel, using some of the channels configured by OFDM. This radio control channel is declared in the allocation amount and arrangement at the head of the super frame. As shown in FIG. 12, a terminal connected to the base station receives a radio control channel in the following procedure.

Step 101: Obtain information related to control channel assignment described in the preamble at the head of the superframe. Here, the super frame is a unit composed of several PHY frames, and a preamble is transmitted at the head.
Step 102: The corresponding PHY frame is extracted from the received signal, and the radio control channel is demodulated based on the determined demodulation method.

  In Non-Patent Document 3, which is a method similar to Non-Patent Document 1, by performing power control on the downlink radio control channel and optimizing resources not only in time × frequency but also in transmitted power, A method for reducing interference to other cells is described.

  The PHY frame in the above description is a minimum division unit in a radio region composed of a plurality of OFDM symbols. Processing such as channel coding is performed in units of PHY frames. In Non-Patent Document 1 or Non-Patent Document 3, a PHY frame is described in FIG. In addition, the PHY frame may have a different name due to standardization, and may be called a subframe.

IEEE C802.20-06 / 04. 3GPP TR 25.814 V7.0.0 (2006-06). 3GPP2 C30-20060626-054R1.

  In a system that assumes various types of data transfer as described in the above prior art, wireless control using a control channel to which resources are fixedly allocated is not desirable. This is because, when a fixed resource is allocated, it is necessary to secure a capacity assuming a service that uses a large amount of the radio control channel resource as the radio control channel resource. In this case, an increase in overhead due to the radio control channel becomes a problem.

  On the other hand, as in Non-Patent Document 1, a configuration that can be flexibly assigned in the same manner as other data channels is proposed instead of being fixedly assigned to a specific resource in a radio control channel. However, even in such a conventional example, the resource allocation of the radio control channel is controlled in superframe units (a collection of several PHY frames) even in the most frequent case, and the PHY frame (or the minimum unit of channels) (or There is also a system called subframe). For this reason, this conventional example is poor in adaptability to fluctuations in the amount of information that needs to be transmitted on the radio control channel generated in the superframe. Therefore, in this conventional example, in order to cope with fluctuations in information that must be transmitted for control that occur in the superframe, in addition to the radio resources that are required on average, radio resources corresponding to margins are allocated to the control channel. It was necessary to keep. As a result, the frequency × time resource that could originally be allocated for data communication remains unused and cannot be used effectively.

  In addition, the method of reducing interference to other cells by the power control of the downlink radio control channel introduced in Non-Patent Document 3 above is an effective method that leads to reduction of interference to other cells. It was not possible to increase the resource of insufficient time × frequency.

  In order to solve the above-described problem, the resource allocated to the radio control channel is divided into a basic part determined for each superframe and an extended part that is reassigned as necessary. Since only the minimum necessary resource allocation is performed in the basic part, unnecessary radio resource allocation due to the margin is eliminated. In the basic part, an index to an extended part to which an additional radio resource is allocated when the transmission capacity of the radio control information is insufficient only by the basic part is described. When receiving the message indicating the index to the extension part, the terminal also performs the reception operation of the radio resource of the extension part. By having two-stage radio control channel allocation in this way, in the radio system using the present invention, the problem of insufficient resources for data communication due to excessive resource allocation of radio control channels is avoided. Thus, the problem is solved.

  Furthermore, the effect is further enhanced by organizing the types of information and separating the information into information that should be assigned to the basic part and information that is not inconvenient in the extended part. Periodic control information such as power control, timing control, and channel quality report is placed in the basic part that is transmitted periodically, and aperiodic control information such as channel assignment information and response to access channels is irregular. It may be arranged in the extended part transmitted to

  In order to solve the above problem, even if it is allocated as a resource for radio control, if it is padding that does not send any information, the problem can be solved by having a mechanism that can be allocated for data communication. Can be solved. For this purpose, it is necessary to divide resources allocated for radio control into a plurality of parts. Priorities such as primary and secondary are assigned to the divided radio resources, and a procedure is set so that reception is performed from a higher priority resource such as a primary. The terminal receives high priority information such as primary, and knows from the resource allocation information described therein that the resources allocated to the radio control channel are also reassigned for data communication. Can do. In this way, by dividing the radio control channel allocation resource and giving priority, in the radio system using the present invention, the problem of resource shortage for data communication due to excessive resource allocation of the radio control channel is avoided. Thus, the problem is solved.

  According to the present invention, it is possible to give flexibility to resources allocated for radio control defined in a unit of time such as a superframe, thereby suppressing generation of radio control resources that are not used, and throughput. Is to improve.

  An OFDM cellular radio communication system generally includes a plurality of base station devices and a plurality of terminal devices as shown in FIG. Base station apparatus 201 is connected to network 202 via a wired line. The terminal device 203 is connected to the base station device 201 by radio and has a mechanism capable of communicating with the network 202.

For example, a radio signal having a frame format as shown in the upper diagram of FIG. 2 is transmitted from the OFDM cellular base station 201. The frame has a super frame configuration composed of PHY frames. The PHY frame becomes a super frame by bundling 24 PHY frames of [0..23]. A superframe preamble is arranged at the head of the superframe. As shown in the lower diagram of FIG. 2, the superframe preamble includes F-pBCH0 in which basic information for receiving OFDM symbols such as the CP length and guard subcarrier is stored, the configuration of the PHY frame, It consists of F-pBCH1 in which information on paging (call connection request to the terminal) is stored, and TDMs 1, 2, and 3, which are preambles for identifying frame synchronization and base stations. Information relating to the assignment of the radio control channel as a point in the present invention is stored in the F-pBCH1. As shown in FIG. 12, a terminal connected to the base station receives a radio control channel in the following procedure.

Step 101:
Information (F-pBCH1) related to control channel assignment described in the preamble at the head of the superframe is acquired.

Step 102:
The corresponding PHY frame is extracted from the received signal, and the radio control channel is demodulated based on the determined demodulation method.

  FIG. 3 is a diagram illustrating the configuration of the PHY frame. The bottom diagram of FIG. 3 illustrates one OFDM symbol. In the OFDM symbol, a CP (Cyclic Prefix) is added to the original signal portion. CP is a technique that can be said to be a feature of OFDM communication, in which a CP length symbol is copied from the beginning of the original signal portion and pasted at the end of the original signal portion as it is. The influence of the multipath can be mitigated by taking the CP length as long as the delay spread (spread of the multipath delay) generated in the multipath is taken in.

  One PHY frame is composed of 8 OFDM symbols. As shown in the middle diagram of FIG. 3, one channel block composed of 16 tones (also called subcarriers) is a basic unit of a radio channel. (A channel block is also called a subchannel as an alias in standardization.) A resource of (16 tones) × (8 OFDM symbols) is assigned to one channel block. Among these, some symbols are allocated as dedicated pilot channels. In the middle diagram of FIG. 3, the hatched portion is an individual pilot. The pilot signal is used for detection and propagation path status estimation. The upper diagram in FIG. 3 shows the configuration of a PHY frame formed by a plurality of channel blocks. As described with reference to FIG. 2, one superframe includes 24 PHY frames. One PHY frame has a plurality of blocks in the frequency direction. For example, the upper diagram in FIG. 3 shows a case where the FFT size is assumed to be 512 and 32 channel blocks are arranged in the frequency direction. Since one channel block is composed of 16 tones, 16 × 32 = 512 tones, which matches the FFT size. In practice, non-transmission subcarriers called guard subcarriers are generally provided at both ends of the frequency band. In this figure, such guard subcarriers are ignored for simplicity of explanation.

  FIG. 4 is a diagram for explaining assignment of radio control channels. A sequence number is assigned to the superframe preamble at the head of the superframe, and the content of the F-pBCH1 portion changes depending on whether the sequence number is odd or even. When the sequence number is an odd number, information on a channel structure such as a hopping structure, a pilot structure, and a control channel structure is transmitted. Quick paging is transmitted for even sequence numbers. Therefore, the control channel allocation status is updated at the head of the odd-numbered superframe, and is switched every two superframes. The middle diagram of FIG. 4 shows the range covered by the structure of the radio control channel assigned by SP # 1. The information on the radio control channel allocated in SP # 1 cannot be sent until SP # 3 that can update the next allocation information is sent.

  FIG. 5 is a diagram illustrating an example of channel assignment of the radio control channel. For the radio control channel, a grant that is a response to the access channel, an F-SSCH that carries uplink / downlink channel assignment information, and an ACK that notifies the success / failure of the transmission in response to uplink data transmission F-ACKCH for transmitting terminal power control information, F-PQICH for notifying uplink signal quality for adaptive control, and F-FOSICH for notifying cell interference information. Each channel is arranged by frequency or time multiplexing, but is divided into a plurality of channel blocks and transmitted in order to obtain frequency diversity gain.

FIG. 6 illustrates information transmitted on the F-SSCH in more detail. On the vertical axis of the table, the type of information to be transmitted is written. Seven types are defined as types.
The message on the first line is access grant information, which is information for returning a MACID as a grant when the terminal recognizes that it is accessing using an access channel.
The messages in the 2nd to 7th lines are information used for uplink or downlink channel allocation. These pieces of information are distinguished by a message identifier called Block Type. The size of each message is set to be approximately 20 bits, and is convolutionally encoded for each message to become encoded information of 20 to 40 bits. The encoded information is QPSK modulated and transmitted. In this F-SSCH part, most of the response messages to the access request from the terminal, the necessary channel resource changes depending on the number of accesses.

  FIG. 7 shows a mechanism for combining the radio control channels shown in FIG. First, since the F-SSCH is composed of several messages, the function block 601 that creates a signal corresponding to the message creates a message. Since a DSP or the like may actually be created, the functional block is divided into a plurality of parts in FIG. 7, but may be performed by one functional block. Information generated by the functional block for generating F-SSCH is converted into channel-coded information via a convolutional encoder 602. When a plurality of F-SSCH messages are sent, information is arranged in order by TDM (603). The F-SSCH and other information (F-ACKCH, F-PCCH, F-PQICH, F-FOSICH) arranged in order are arranged in a predetermined order in TDM (604). In the mapping 610, the downlink radio control channel is mapped to a two-dimensional space composed of frequency and time as shown in the example of FIG. 5 together with the separately generated dedicated pilot (609).

A first embodiment according to the present invention will be described with reference to FIGS.
In the first embodiment, the resource allocated to the radio control channel is divided into a basic part defined for each superframe and an extended part that is reassigned as necessary in the basic part. The basic part eliminates unnecessary radio resource allocation by the margin by performing only the minimum necessary resource allocation. In the basic part, an index to an extended part to which an additional radio resource is allocated when the transmission capacity of the radio control information is insufficient only by the basic part is described. When receiving the message indicating the index to the extension part, the terminal also performs the reception operation for the radio resource of the extension part. Here, a question arises as to whether or not the terminal can receive information on an extended portion transmitted at a different frequency at the same time. However, when performing FFT in OFDM, information on the FFT size must be received. By storing the information temporarily in the memory, it is possible to demodulate the information even if the basic part is received as described above and the information of the extended part needs to be demodulated later. It is. By having two-stage radio control channel allocation in this way, in the radio system using the present invention, the problem of insufficient resources for data communication due to excessive resource allocation of radio control channels is avoided. Furthermore, the effect is further enhanced by organizing the types of information and separating the information into information that should be assigned to the basic part and information that is not inconvenient in the extended part. Information that must be transmitted periodically, such as power control, timing control, and channel quality report, is placed in the basic part, and information that is transmitted irregularly, such as channel assignment information and responses to access channels, is placed in the extended part. May be.

  FIG. 8 is a diagram showing the result of radio control channel assignment showing the method of the first embodiment according to the present invention. FIG. 8 is almost the same as FIG. 4, but is different from the prior art in that a new radio control channel 301 is allocated to the second frame of the PHY frame as an extended portion. Due to the superframe preamble at the top of the superframe, the control channel allocation status is updated at the top of the odd-numbered superframe, and switching between every two superframes is the same as in the prior art. The middle part of FIG. 8 shows a range to which the influence of the radio control channel structure assigned by SP # 1 is affected. The information on the radio control channel allocated in SP # 1 cannot be sent until SP # 3 that can update the next allocation information is sent.

  However, according to the present embodiment, a new radio control channel 301 is allocated as an extended portion in the second frame of the PHY frame. This is because the radio control channel 301 is newly allocated as an extended portion in the radio control channels (BL0, BL15, and BL30 in FIG. 8) allocated in the hatched superframe preamble.

  The allocation mechanism will be described with reference to FIG. FIG. 9 shows the Ext. Ext. Line 8 in the F-SSCH correspondence table shown in FIG. The message of CCH (401) is added. This message is for notifying the terminal that a channel for radio control is newly allocated, and whether it is Sticky (assigns a continuous channel block until instructed by the next superframe preamble to the radio control channel. Or a single channel block is assigned to a radio control channel). The channel number assigned in this message is specified by ChanID.

  The radio control channel uses a plurality of channel blocks, and information is arranged so as to cross the channel blocks. Thus, consideration is given so that diversity gain can be obtained from different frequency selectivity for each channel block. In the present invention, if the channel is simply expanded, all the added information is arranged in a single channel block. However, as shown in FIG. 16, since the F-SSCH is arranged at the head of the radio control channel, Ext. By placing the CCH (501) message at the head of the channel, it is possible to immediately determine a channel block to which reception of F-SSCH is added. Therefore, as indicated by arrows in FIG. 16, (1) (2). . Can be received in this order. In this way, in the first embodiment according to the present invention, the radio control channel can be expanded while obtaining the frequency diversity effect. However, in the above example, since the next signal reproduction cannot be performed until the convolutional code is Viterbi-decoded, it is not particularly suitable for transmission of PCCH, ACKCH, etc. that require immediacy.

  In another embodiment, there is a method of separating the one arranged in the basic part and the one arranged in the extension part depending on the type of the radio control channel. For example, the radio control channel can be divided into F-SSCH and other information (F-ACKCH, F-PCCH, F-PQICH, F-FOSICH). The F-SSCH collects information to be transmitted irregularly, such as grant to access channel and channel assignment of data channel. On the other hand, the other information is a collection of information that must be sent periodically. Therefore, the minimum F-SSCH and other information (F-ACKCH, F-PCCH, F-PQICH, F-FOSICH) should be placed in the basic part, and the undefined part of F-SSCH should be placed in the extended part. This can increase efficiency.

The operation of the terminal according to the first embodiment of the present invention will be described with reference to the flowchart shown in FIG. Steps 101 and 102 are exactly the same as the conventional flow.

Step 101:
Information (F-pBCH1) related to control channel assignment described in the preamble at the head of the superframe is acquired.

Step 102:
The corresponding PHY frame is extracted from the received signal, and the radio control channel is demodulated based on the determined demodulation method.

Step 103:
The demodulated result is Ext. Check if CCH message is included. If Ext. If a CCH message is included, go to step 104.

Step 104:
The designated PHY frame for extended radio control channel is extracted from the received signal, and the radio control channel is demodulated based on a predetermined demodulation method.

  Thus, Ext. By using the CCH message, the resource allocated to the radio control channel can be divided into a basic part determined for each superframe and an extended part reassigned as necessary in the basic part. If the basic part is not enough, an extended part can be assigned.

  In the present embodiment, the description has focused on the 3GPP2 LBC, but the effect of this patent does not change even with other similar methods.

  In the present embodiment, the channel block has been described with reference to FIG. 3. However, in OFDM cellular, as shown in FIG. 3, localization using continuous subcarriers as a block, and discontinuous subcarriers are collectively blocked according to a specific rule. There are two types of distributions. In the above description, only the case of localization has been described for simplicity of explanation, but it is clear that the effect of this patent does not change even in the case of distribution.

A second embodiment according to the present invention will be described with reference to FIGS.
FIG. 10 corresponds to FIG. 4 of the conventional example. The point of the second embodiment according to the present invention is that the resource 501 assigned to the radio control channel is reassigned to the data transmission channel in the superframe preamble.

  Even if it is allocated as a resource for radio control, if it is padding that does not transmit any information, the problem can be solved by having a mechanism allocated for data communication. For this purpose, it is necessary to divide resources allocated for radio control into a plurality of parts. Priorities such as primary and secondary are assigned to the divided radio resources, and a procedure is set so that reception is performed from a higher priority resource such as a primary. The terminal receives high priority information such as primary, and knows from the resource allocation information described therein that the resources allocated to the radio control channel are also reassigned for data communication. Can do. In this way, by dividing the radio control channel allocation resources and giving them priority, in the radio system using the present invention, the problem of resource shortage for data communication due to excessive resource allocation of radio control channels is avoided. In the above, the reason why the resources must be divided is frequency diversity. As already described in FIG. 5, the radio control channel is transmitted across a plurality of channel blocks in order to obtain a diversity effect. Therefore, unless the channel assignment is divided in advance, the terminal receives channel block # 15 (BL15) as a resource to which the control channel is assigned, and the order of encoding is lost. In this case, the original information cannot be extracted even if Viterbi decoding is performed, and an error always occurs even if a parity check using a CRC (redundant code) is performed. There are two ways to prevent this.

  One method is to divide the channel block into primary and secondary in advance as shown in FIG. As described in the first embodiment, the secondary is divided into information to be sent periodically and irregular information, and most of the F-SSCH which is irregular information is made secondary. The secondary is transmitted only when necessary, and can normally be assigned to a data channel. Therefore, when there is little information to be sent as the F-SSCH, a shortage of radio resources is unlikely to occur.

FIG. 14 illustrates the flow of a conventional example regarding data channel allocation.

Step 111:
A new data channel is assigned to a resource that is not already assigned as a data channel or radio control channel.

In the prior art, when there is no resource to be allocated, transmission is waited until the next opportunity. In the second embodiment of the present patent, step 112 is newly added as shown in FIG.

Step 112:
When there is no resource to be allocated, it is confirmed whether there is an empty channel in the radio control channel. If there is a radio control channel that is not used in this PHY frame, this radio control channel is assigned as a data channel as NonSticky (not a continuous assignment but a one-time packet assignment).

  According to the second embodiment, a resource once allocated as a radio control channel can be used as a data channel according to the utilization rate, and the problem is solved. The terminal needs to know that the channel block is used as a general data channel. For this reason, it is desirable that a message indicating that the secondary resource is used as a data channel is transmitted by F-SSCH. Alternatively, the CRC sequence of the data channel and the radio control channel may be changed so that even if a signal assigned as the data channel can be received, an error will always occur in the CRC if demodulated as the control channel.

  FIG. 17 shows a device configuration example for carrying out the present invention. The antenna 701 captures a radio signal and converts it into an electric signal. In reception, the RF unit 702 down-converts an RF frequency signal received by the antenna 701 into a baseband frequency signal, and converts an analog signal into a digital signal. The converted signal is sent to the baseband unit 703. In transmission, the digital signal sent from the baseband unit 703 is converted into an analog signal, and the signal of the baseband frequency is up-converted into an RF signal. The up-converted signal is amplified to an appropriate transmission power and then transmitted from the antenna 701. The baseband unit performs most of OFDM signal processing, and performs processing such as CP insertion / removal, FFT / IFFT processing, mapping / demapping, channel estimation, modulation / demodulation, channel coding / decoding, and the like. . In the baseband unit, a predetermined channel block process and a control channel modulation / demodulation process are performed in accordance with an instruction from the DSP 704. The digital signal demodulated by the baseband unit 703 is passed to the network interface unit 705 via the DSP 704 or not shown in the figure, and reception information is sent to the network. Information sent from the network is received by the network interface unit 705 and passed to the DSP 704 or directly to the baseband unit 703 (not shown in the figure). The DSP 704 designates the baseband unit 703. Based on the modulation method, it is mapped to a channel block designated by the DSP 704 and converted to baseband. The MPU 706 is a unit that manages the state and information of the entire wireless device, and is connected to each unit to control management information collection and parameter setting.

  The flow of FIG. 12 or 13 describes the radio control channel allocation method, but in FIG. 17, the DSP 704 is the main body that implements this flow. The DSP 704 obtains control information from the baseband unit 703, the RF unit 702, and the network interface unit 705, creates control information from the obtained information, passes the created control information to the baseband unit 703, and simultaneously sets a channel block. specify. In the embodiment of this patent, when a channel block is designated, the channel block is determined according to the flow of FIG.

  The flow of FIG. 14 or FIG. 15 describes the data channel allocation method, and the DSP 704 is the main implementation body for this. The DSP 704 acquires control information from the baseband unit 703, the RF unit 702, and the network interface unit 705, passes the information to be transmitted obtained from the network interface unit 705 to the baseband unit 703, and simultaneously designates a channel block. In the embodiment of this patent, when a channel block is designated, the channel block is determined according to the flow of FIG.

  According to the present invention, particularly in OFDMA-based cellular communication, it is possible to optimize the overhead of radio resources reserved for radio control and prevent a reduction in system capacity.

The figure which shows the structure of an OFDM cellular system. The figure which shows the frame format of the OFDM cellular system which consists of a prior art. FIG. 3 is a diagram illustrating a superframe structure and a preamble at the head of the superframe. The figure which shows the frame format of the OFDM cellular system which consists of a prior art. The figure explaining especially a PHY frame, a channel block, and an OFDM symbol. The figure which shows the structure of the radio | wireless control channel which consists of a prior art allocated with a super-frame preamble. The figure which shows the example of arrangement | positioning of the downlink control channel arrange | positioned on the some radio | wireless control channel which consists of a prior art. The figure explaining the message of F-SSCH which consists of a prior art. The functional block diagram which produces | generates the downlink radio control channel which consists of a prior art. The figure which shows the structure of the radio | wireless control channel which consists of a 1st Example of this invention. The figure explaining the message of F-SSCH which consists of a 1st Example of this invention. The figure which shows the structure of the radio | wireless control channel which consists of a 2nd Example of this invention. The figure which shows the example of arrangement | positioning of the downlink control channel arrange | positioned on the some radio | wireless control channel which consists of a 2nd Example of this invention. The flowchart until a terminal receives a radio control channel in a prior art. The flowchart until a terminal receives a radio | wireless control channel in 1st Example of this invention. In the prior art, the flowchart at the time of determining the channel block which a base station allocates a data channel. The flowchart at the time of determining the channel block which a base station allocates a data channel in 2nd Example which consists of this invention. The figure which shows the example of arrangement | positioning of the downlink control channel arrange | positioned on a some radio | wireless control channel in 1st Example which consists of this invention. The figure which shows the apparatus structural example for implementing this invention.

Explanation of symbols

201 ... Base station device 202 ... Network 203 ... Terminal device 301 ... Newly assigned radio control channel 401 in the first embodiment ... F-SSCH message 501 ... newly added . Radio control channel 601... F-SSCH generation block 602... Convolutional coding block 603... TDM processing block 604... F-ACKCH generation block reassigned to the data channel in the second embodiment 605 ... F-PCCH generation block 606 ... F-PQICH generation block 607 ... F-FOSICH generation block 608 ... TDM processing block 609 ... Individual pilot generation block 610 ... Mapping block 701. .. Antenna 702 ... RF unit 703 ... Baseband unit 704 ... Digital signal processing unit (DSP)
705 ... Network interface unit 706 ... Control unit (MPU)
SP # n ... Sequence number #n of superframe preamble
PHYn ... nth PHY frame.

Claims (11)

  An OFDM cellular radio control channel allocation method in an OFDM cellular radio communication system, wherein a resource allocated to a radio control channel is divided into a basic part determined for each superframe and an extended part allocated as needed. Control channel allocation method.   2. The OFDM cellular radio control channel assignment method according to claim 1, wherein the basic part is assigned at the head of a super frame, and the extended part is assigned at the basic part. .   2. The OFDM cellular radio control channel allocation method according to claim 1, wherein the resource size of the basic part is calculated from the amount of information that needs to be transmitted each time. .   4. The OFDM cellular radio control channel allocation method according to claim 3, wherein the information that needs to be transmitted each time includes at least one of transmission power control, transmission timing control, channel quality report, and transmission packet modulation information. An OFDM cellular radio control channel allocation method characterized in that:   In the OFDM cellular radio control channel assignment method in the OFDM cellular radio communication system, the radio control resource assigned at the head of the superframe is divided into a plurality of parts and given priorities, and the radio control channel Is an OFDM cellular radio control channel allocation characterized by reallocating resources with low priority that are used from resources with high priority and that are not used because there is no control information to be transmitted as resources for user data transmission. Method.   6. The OFDM cellular radio control channel allocation method according to claim 5, wherein the size of the radio control resource allocated at the head of the superframe is calculated from the information amount of information that needs to be transmitted each time. An OFDM cellular radio control channel assignment method.   7. The OFDM cellular radio control channel allocation method according to claim 6, wherein the information that needs to be transmitted each time includes at least one of transmission power control, transmission timing control, channel quality report, and transmission packet modulation information. An OFDM cellular radio control channel assignment method comprising: A base station used for OFDM cellular radio communication,
A controller that allocates resources to the radio control channel;
A transmission unit for transmitting control data for informing the resource allocated by the control unit,
The control unit
A base station characterized in that a resource to be allocated to the radio control channel is divided into a basic part determined for each superframe and an extended part to be allocated as necessary. The base station according to claim 8, wherein
A base station that broadcasts the allocation resource of the basic part at the head of a superframe and broadcasts the allocation resource of the extension part at the basic part. The base station according to claim 8, wherein
A base station characterized in that the resource size of the basic part is calculated from the amount of information that needs to be sent each time. The base station according to claim 10, wherein
The base station characterized in that the information that needs to be transmitted every time includes at least one of transmission power control, transmission timing control, channel quality report, and transmission packet modulation information.