JP2006245973A - Radio unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To match the frame timing of a plurality of radio units which are provided in the same radio station in a mesh type radio access system, for example, and each of which performs radio communication with another radio station respectively, with that of the other radio unit. <P>SOLUTION: In the radio unit 11, a timing acquisition means 23 acquires a frame timing in radio communication performed by another radio unit, and a timing control means 21, 22 controls the frame timing in radio communication performed by the present unit 11 so as to reduce the difference between the frame timing in the radio communication performed by the present unit 11 and the acquired frame timing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless unit provided, for example, in a wireless station (node) of a mesh-type wireless access system, and more particularly to a wireless unit that matches frame timing with another wireless unit in the same wireless station.

  For example, a subscriber radio access system includes a point-to-point (P-P) system in which a base station apparatus and a user apparatus are connected one-to-one to perform communication, and a base station apparatus and a plurality of user apparatuses. There is a P-MP (Point to Multiple Point) system that performs communication at the same time. Also, an MP-MP (Multiple Point to Multiple Point) system called a mesh-type wireless access system with improved frequency utilization efficiency and network reliability compared to the two systems has been proposed (for example, Non-Patent Document 1). reference.).

FIG. 8 shows a configuration example of a mesh type wireless access system.
As shown in FIG. 8, the mesh-type wireless access system includes a plurality of nodes 71 that are wireless stations in which a plurality of wireless units are mounted. Here, in the drawings of the present application, nodes are indicated by circles (◯) or double circles (◎). In FIG. 8, only one node 71 among the plurality of nodes is denoted by a reference numeral.
Further, in FIG. 8, a state where wireless communication is established between a wireless unit mounted on a certain node and a wireless unit mounted on the opposite node is shown as a link (wireless link) 72. Here, in the drawings of the present application, links are indicated by solid lines. In FIG. 8, only one link 72 of the plurality of links is given a reference numeral.
Thus, the mesh type wireless access system is characterized in that a plurality of wireless nodes 71 are connected by a plurality of wireless links 72.

In the mesh type radio access system, in order to improve the frequency utilization efficiency which is one of the problems in the two systems, the duplex system of the radio link 2 connecting the nodes 71 is adapted as a TDD (Time Division Duplex) system. A modulation method is adopted.
FIG. 9A shows a base station device 81 and a terminal device 82 that perform wireless communication using the TDD scheme as an example of a wireless communication system. FIG. 9B shows an example of a TDD frame. Here, communication from the base station device 81 to the terminal device 82 is downlink communication, and communication from the terminal device 82 to the base station device 81 is uplink communication.
As shown in FIGS. 9A and 9B, in the TDD scheme, the same frequency is used alternately for uplink signals (uplinks) and downlink signals (downlinks). The signal can be regarded as being in the same propagation path condition by the principle of reversibility. For this reason, by using the reversibility of the propagation path and estimating the propagation path condition at the next transmission timing using CNR (Carrier to Noise power Ratio) measured from the received signal, etc. It is possible to realize an adaptive modulation scheme without performing.

  In the TDD system, one of the wireless communication establishments is a synchronization master, and the other is a synchronization slave. The synchronization master operates at its own frame timing, and the synchronization slave operates according to the frame timing reproduced from the signal transmitted by the synchronization master.

Nomoto, et al., “Next Generation Fixed Wireless Access System”, Shingaku Sodai, B-5-270, 2001

  However, in the conventional mesh-type wireless access system, when a plurality of wireless units repeatedly use the same frequency in the same node, if there is a difference in the frame timing of the plurality of wireless units, mutual transmission is performed. There was a problem that the signal caused interference.

Such a problem will be specifically described with reference to FIGS. 10 and 11.
FIG. 10 shows three nodes 91, 92, 93, two links 94, 95, and two wireless units 96, 97 mounted on the node 92. Here, the respective nodes 91, 92, and 93 are referred to as node # 1, node # 2, and node # 3, the respective links 94 and 95 are referred to as link # 1 and link # 2, and the respective wireless units 96 and 97 are referred to. Are referred to as wireless unit # 1 and wireless unit # 2.
FIG. 11 shows an example of the timing of the TDD frame in the link # 1 formed by the wireless unit # 1, and an example of the timing of the TDD frame in the link # 2 formed by the wireless unit # 2. Interferences 101 and 102 due to frame timing shifts observed at node # 2 in which units # 1 and # 2 are mounted are shown.

For example, as shown in FIG. 10, a wireless network is configured, and the wireless link # 1 configured by the node # 1 and the node # 2 and the wireless link # 2 configured by the node # 2 and the node # 3 are the same. It is assumed that the frequency is used and the phase of the frame timing of the radio link # 1 and the radio link # 2 is shifted as shown in FIG.
In this case, in the two wireless units # 1 and # 2 mounted on the node # 2, when the one wireless unit # 1 is transmitting, the other wireless unit # 2 receives and the problem of the interference 101 occurs. Will occur. Conversely, a situation occurs in which the transmission signal from the other wireless unit # 2 gives interference 102 to the reception signal of the one wireless unit # 1.

When the same frequency cannot be assigned to a plurality of radio links at the same node due to such interference, there is a problem that it is difficult to improve frequency utilization efficiency.
As a means for matching the phases of a plurality of frame timings, a means for matching the frame timings based on an external reference signal such as GPS (Global Positioning System) can be considered. There is a problem that it becomes impossible to install a node in an area where it cannot be received, which limits the development of the network configuration, and an additional circuit for using GPS or the like is required. there were.

  The present invention has been made in view of such conventional circumstances, and provides a wireless unit capable of matching the frame timing with another wireless unit in the same wireless station (node). Objective.

In order to achieve the above object, the wireless unit according to the present invention performs the following processing when a plurality of wireless units are provided in the same wireless station and perform wireless communication with other wireless stations.
That is, the timing acquisition unit acquires the timing of a frame in wireless communication performed by another wireless unit. The wireless control performed by the self unit so that the timing control means reduces the difference between the timing of the frame in the wireless communication performed by the self unit (that is, the wireless unit according to the present invention) and the timing of the acquired frame. Controls frame timing in communication.
Therefore, in the wireless unit according to the present invention, the frame timing can be matched with other wireless units in the same wireless station (node). As a result, for example, in the same radio station, the transmission interval in one radio unit that performs radio communication using the same frequency and the reception interval in another radio unit do not overlap, so that the frequency utilization efficiency is increased. Can be improved.

Here, various numbers may be used as the number of wireless units provided in the same wireless station.
In addition, the timing of the frame in the wireless communication performed by another wireless unit is output by, for example, a timing output unit provided in the other wireless unit, and the timing acquisition unit acquires the timing by inputting it.
Various modes may be used as a mode for controlling the frame timing in the self unit so that the difference between the frame timing in the self unit and the frame timing in the other radio unit becomes small. Further, for example, it is preferable to control the frame timings to coincide with each other, but there may be an error within a practically effective range.

The radio unit according to the present invention has the following configuration as one configuration example.
That is, the timing acquisition unit acquires the timing of a frame in wireless communication performed by another wireless unit that is a synchronization target provided in the same wireless station.
The timing control unit includes a determination unit, a value setting unit, and a timing generation unit.
The determination unit performs determination regarding a difference between the timing of the frame in the wireless communication performed by the self unit and the timing of the acquired frame. The value setting means sets a value for reducing the difference between the timing of the frame in the wireless communication performed by the self unit and the timing of the acquired frame based on the determination result. The timing generation unit generates a frame timing in the wireless communication performed by the self unit based on the set value.
Therefore, it is possible to match the frame timing with other wireless units by controlling the value used to generate the timing of the frame in the wireless communication performed by its own wireless unit.

Here, various other wireless units may be designated as other wireless units to be synchronized, for example, other wireless units to be synchronized inside or outside the wireless unit according to the present invention. A designation means for designating the unit is provided.
In addition, various determinations may be made as to the difference between the frame timing in the own unit and the frame timing in the other wireless unit, for example, whether the frame timing in the own unit is advanced or delayed. In addition, for example, it is also possible to make a determination that specifies an amount that is advanced or an amount that is delayed.

  Various values may be used as values for reducing the difference between the frame timing in the self unit and the frame timing in the other radio unit. For example, when the timing generation means regards the value as equivalent to one frame and generates the next frame timing, when the frame timing in the self unit is advanced, the value is set to the value corresponding to the original one frame. Increase the value to delay the frame timing in the self unit, but if the frame timing in the self unit is delayed, make the value smaller than the original one frame to advance the frame timing in the self unit. be able to. In this case, it is also possible to increase the amount of deviation of the value from the original one frame as the amount of advance or delay is larger. Further, when there is no difference between the frame timing in the self unit and the frame timing in the other wireless unit and they match, the original value for one frame is set as the value.

  As described above, according to the wireless unit according to the present invention, the timing of the frame in the wireless communication performed by another wireless unit provided in the same wireless station is obtained, and the frame of the wireless communication performed by the self unit is acquired. Since the timing of the frame in the wireless communication performed by the own unit is controlled so that the difference between the timing and the timing of the acquired frame becomes small, the frame between the other wireless units in the same wireless station For example, the frequency utilization efficiency can be improved.

An embodiment according to the present invention will be described with reference to the drawings.
In this embodiment, control is performed to match the frame timing of a certain radio link with the frame timing of a radio link other than this radio link (other radio link) (referred to as inter-frame frame synchronization processing in this embodiment). . In this embodiment, the frame timing of the reference radio link is referred to as “first radio frame timing”, and the frame timing of other radio links that perform phase synchronization with this “first frame timing” as a target is referred to as “first radio frame timing”. Say “second radio frame timing”.

Also, in the TDD scheme, a dependency relationship is required between wireless stations that have established wireless communication, the synchronization master operates at its own frame timing, and the synchronization slave depends on the frame timing reproduced from the signal transmitted by the synchronization master. It is common to operate. In this embodiment, the inter-link frame synchronization processing is performed on the master side, and the slave-side receiving unit establishes frame synchronization between links by having a function of following the transmission timing changed by the master side.
Also, in this embodiment, the case where transmission starts from the beginning of the frame is defined as the upper TDD, and the case where transmission starts from the beginning of the frame is defined as the lower TDD. A section having a (High) level is defined as a transmission section, and a section having a frame timing at a low level is defined as a reception section.

FIG. 1 shows a configuration example of a radio station (radio station #m) 1 installed in a node of the mesh type radio access system.
The wireless station 1 of this example includes a plurality of n (n ≧ 2) wireless units 11, a wireless channel management unit 12, and a common bus 13 that connects them. Here, the configuration and operation of each wireless unit are the same. In FIG. 1, only one wireless unit 11 is denoted by a reference numeral.
The wireless unit 11 of this example includes a reception baseband unit 21, a transmission baseband unit 22, and a timing control unit 23.

The radio channel management unit 12 performs control of each radio unit 11, determination of a modulation method that is an adaptive modulation function, frequency allocation of each radio link, control of inter-link frame synchronization processing, and the like.
Each of the wireless unit 11 and the wireless channel management unit 12 has a function of transmitting / receiving control information, various data, timing, and the like via the common bus 13. In addition, when the wireless unit 11 has established a wireless link, it has a function of outputting the reproduced frame timing to the common bus 13 and referring to the frame timing from other wireless units. Yes. In this example, for example, frame timings # 2 to #n from other wireless units # 2 to #n are input to the wireless unit # 1, and frames from all other wireless units are input to each wireless unit 11. Timing is input.

FIG. 2 shows a configuration example of the wireless unit 11 focusing on a circuit for controlling the frame timing. In this example, the wireless unit # 1 will be described as an example, but the same applies to the other wireless units # 2 to #n.
The reception baseband unit 21 of this example includes a reception unit counter 31, a reception unit decoder 32, a count value holding unit 33, and a determination unit 34.
The transmission baseband unit 22 of this example includes a count value setting unit 41, a transmission unit counter 42, and a transmission unit decoder 43.

  In this example, the signal that the radio channel management unit 12 notifies the transmission baseband unit 22 and the reception baseband unit 21 of the start of the inter-frame frame synchronization processing is called an “inter-frame frame synchronization processing flag”. The number of the wireless unit that is the synchronization target of the synchronization process is referred to as “synchronization target ID”. The frame timing generated by the transmission baseband unit 22 is referred to as “transmission frame timing”.

The operation example of each part in the wireless unit 11 is shown.
An example of the operation of the timing control unit 23 is shown.
The timing control unit 23 includes an inter-link frame synchronization processing flag from the wireless channel management unit 12, a completion notification, a synchronization target ID, a transmission frame timing from the transmission unit decoder 43, and frame timings # 2 to #n from other wireless units. Is an input signal.
While the inter-link frame synchronization processing is being performed, the timing control unit 23 uses the transmission frame timing generated by using the oscillator of the transmission baseband unit 22 as a reference oscillation as a reference frame timing, and receives and counters 31 and 42. Referring to the input synchronization target ID, one of the frame timings # 2 to #n generated by the other wireless units is designated by the synchronization target ID as the first wireless frame. It outputs to the count value holding part 33 as timing. For example, when the synchronization target ID is 2 when the inter-link frame synchronization process is performed in the wireless unit # 1, the frame timing # 2 is used as the first wireless frame timing of the wireless unit # 1.
When the inter-link frame synchronization processing is completed, a completion notification is transmitted from the radio channel management unit 12 and notified to the timing control unit 23. In response to this, the timing control unit 23 sets the reference frame timing to the first level. The signal is switched to the same signal as the radio frame timing and output to the reception unit counter 31 and the transmission unit counter 42.

An operation example of the reception baseband unit 21 is shown.
The reception unit counter 31 clears the count value to zero (0) at the beginning of the reference frame timing output from the timing control unit 23, counts one frame length, and stores the count value in the reception unit decoder 32 and the count value. To the unit 33. Further, the reception unit counter 31 repeatedly performs the same processing. Here, as the count value of one frame length, for example, the symbol length of one frame is 500 symbols, the over-sampling of data used in the reception baseband unit 21 is four times, and the count is based on the number of samples. When performing the above, the count value corresponding to one frame length is 2000, and the count value takes a value of 0 to 1999.

The receiver decoder 32 decodes the input count value, generates a frame timing of the TDD frame period, and outputs it. This frame timing signal corresponds to a second radio frame timing signal in the inter-link frame synchronization processing. For example, when communication is performed with a ratio of 1: 1 to 1: 1 transmission and reception of TDD timing, the frame timing is output as a high level when the count value of the reception unit counter 31 is 0 to 999. When the count value is 1000 or more, the frame timing is output as a low level.
The frame timing # 1 output from the receiver decoder 32 of the wireless unit # 1 is transmitted to the other wireless units # 2 to #n.

The count value holding unit 33 holds the count value from the reception unit counter 31 at the head timing of the first radio frame timing output from the timing control unit 23 in the memory.
The determination unit 34 reads the count value held in the count value holding unit 33, and whether the second radio frame timing is advanced (advanced) or delayed with respect to the first radio frame timing. Is determined (delayed) or matched (matched), and the determination result is notified to the count value setting unit 41 of the transmission baseband unit 22 and the radio channel management unit 12 .

3 and 4 show specific examples of the second radio frame timing, the count value of the reception unit counter 31 (reception unit counter value), and the first radio frame timing.
In this example, as shown in FIG. 3, when the count value held in the count value holding unit 33 is a value located in the latter half of the entire frame as in the case where the count value is 1400 or the like, It is determined that the second radio frame timing is delayed with respect to the radio frame timing.
Conversely, in this example, as shown in FIG. 4, when the count value held in the reception unit counter 31 is a value located in the first half of the entire frame, such as when the count value is 299 or the like, It is determined that the second radio frame timing is in advance with respect to the first radio frame timing.
In this example, when the count value held in the reception unit counter 31 is 0, it is determined that the second radio frame timing matches the first radio frame timing.
As for the count value held in the count value holding unit 33, the leading edge of the first radio frame timing is a rising edge when it is higher in TDD, and a falling edge when it is lower than TDD. Therefore, processing is performed according to the corresponding edge.

An operation example of the transmission baseband unit 22 is shown.
The count value setting unit 41 sets a value larger than the count value of one frame length in the transmission unit counter 42 when the determination result notified from the determination unit 34 is advanced during the inter-link frame synchronization process, When the determination result is delayed, a value smaller than the count value of one frame length is set in the transmission unit counter 42, and when the determination result is coincident, a count value corresponding to one frame length is transmitted. Set to the counter 42.
Further, in a state where the inter-frame frame synchronization processing is not performed, the count value setting unit 41 sets a count value (a constant value) corresponding to one frame length in the transmission unit counter 42.

The transmission unit counter 42 receives the reference frame timing from the timing control unit 23, and performs a count-up operation at the same cycle as the reception unit counter 31, for example, using a crystal oscillator or the like different from the reception baseband unit 21 as a source oscillation. It has a counter to perform, and outputs this count value to the transmitter decoder 43.
Here, the aspect of the count number in the transmission unit counter 42 is the same as that described for the count value of the reception unit counter 31. Specifically, the transmission unit counter 42 clears the count value to zero (0) at the top of the frame at the reference frame timing as the start of counting, and counts up to the count value set by the count value setting unit 41 from there. Thereafter, the same processing is repeated.

The transmission unit decoder 43 decodes the count value from the transmission unit counter 42, generates transmission frame timing having a TDD frame period, and outputs the transmission frame timing to the timing control unit 23. This output method is the same as in the case of the receiving unit decoder 32 described above, and the cycle of the transmission frame timing changes according to the count value set by the count value setting unit 41.
Further, in this example, the transmission timing on the TDD master side is changed by such processing, and accordingly, the start timing of the transmission signal on the TDD master side fluctuates accordingly, and on the TDD slave side, such a transmission signal is changed. It has a function to follow the fluctuations.

Next, taking the link configuration shown in FIG. 5 as an example, an operation example of inter-link frame synchronization processing will be shown.
FIG. 5 shows five nodes 51 to 55 and four links 61 to 64. Here, the respective nodes 51 to 55 are referred to as a node # 1, a node # 2, a node # 3, a node # 4, and a node # 5, and the respective links 61 to 64 are a link # 1, a link # 2, and a link # 3. Say link # 4.
In this example, a specific example in which the inter-link frame synchronization processing is performed with the frame timing of the link # 2 as the second radio frame timing and the frame timing of the link # 1 as the first radio frame timing is shown.

In this specific example, the number of symbols in one frame length is 1500, the number of oversamples is doubled, and the reception unit counter 31 and the transmission unit counter 42 perform a count-up operation twice per symbol. Accordingly, the range of the count value takes a value of 0 to 2999 when timing adjustment is not performed. In this example, when timing adjustment is performed, the maximum value in the count value range is set to 2998 or 3000, thereby changing the time per frame period.
In this example, for link # 1 and link # 2 in node # 2, it is assumed that the wireless unit that generates the frame timing is operating as a TDD host.

A first specific example will be described with reference to the timing chart shown in FIG.
In FIG. 6, the second radio frame timing, the count value of the reception unit counter 31 (reception unit counter value), the first radio frame timing, and the count value of the transmission unit counter 42 (transmission unit counter value) A specific example of the transmission frame timing is shown.
When the inter-link frame synchronization processing starts, the radio channel management unit 12 uses the inter-frame frame synchronization processing flag and the synchronization target ID (in this example, information indicating the radio unit forming the link # 1) as a target radio unit ( In this example, notification is made to the wireless unit forming the link # 2.

The wireless unit that has received the inter-link frame synchronization processing flag and the synchronization target ID performs the following processing.
That is, the timing control unit 23 outputs the reference frame timing and the first radio frame timing to the reception baseband unit 21 according to control by the radio channel management unit 12.
The reception baseband unit 21 stores in the count value holding unit 33 the count value of the reception unit counter 31 that operates on the basis of the beginning of the reference frame timing at the rise of the frame timing of the link # 1, which is the first radio frame timing. To do.

In this specific example, it is assumed that the count value held by the count value holding unit 33 is 2100.
In this case, the determination unit 34 determines that there is a delay, and notifies the transmission baseband unit 22 and the radio channel management unit 12 of the determination result. The count value setting unit 41 sets a value of 2998, which is 1 smaller than the count value of 1 frame length (2999 in this example), to the transmission unit counter 42 based on the notified information of delay.
Then, as shown in FIG. 6, since the transmission frame timing advances by one count in time, the frame timing based on the transmission frame timing similarly advances by one count. In this case, in the next frame, the count value held by the count value holding unit 33 is 2101, and it is determined again that it is delayed, and the count value setting unit 41 sets the value 2998 again.

When such processing is repeated, the frame timing is shifted in the direction of time advance by one count (leftward in FIG. 6), and the count value held in the count value holding unit 33 gradually becomes 2999. Approaching. When the held count value reaches 2999, the count value held in the count value holding unit 33 becomes 0 in the next frame by advancing the transmission frame timing by one count according to the delay determination by the determination unit 34. . If the count value 0 is held, the determination unit 34 determines that they match, and ends the adjustment of the count value. In this example, the wireless channel management unit 12 that has received the determination result that matches. In response to this, a completion notification is output to the timing control unit 23.
Upon receiving the completion notification, the timing control unit 23 switches the reference frame timing to the frame timing of the link # 1, which is the first radio frame timing, and completes the inter-link frame synchronization processing.
With such an operation, link # 2 is synchronized with link # 1.

  Further, when link # 3 is synchronized with link # 2, the frame timing of link # 2 is set as the first radio frame timing, and the frame timing of link # 3 is set as the second radio frame timing. Similar processing is performed, whereby link # 3 is synchronized with link # 2, that is, link # 3 is synchronized with link # 1.

A second specific example will be described with reference to the timing chart shown in FIG.
FIG. 7 shows the second radio frame timing, the count value of the reception unit counter 31 (reception unit counter value), the first radio frame timing, and the count value of the transmission unit counter 42 (transmission unit counter value). A specific example of the transmission frame timing is shown.
Note that this example is the same as the first example described above except that the progress of the second radio frame timing has occurred, and therefore, mainly the differences will be described.

The operation when the inter-link frame synchronization processing is performed in the state where the communication is established with the timing relationship as shown in FIG. 7 is as follows.
For example, when the count value held by the count value holding unit 33 is 700, the determination unit 34 determines that the process is in progress, and notifies the transmission baseband unit 22 and the radio channel management unit 12 of the determination result. To do.
The count value setting unit 41 sets a value of 3000, which is 1 larger than the count value of one frame length, to the transmission unit counter 42 based on the notified information of progress. Thereby, the transmission part counter 42 will return to 0, if it will count to 3000, and will restart a count.

  At this time, as shown in FIG. 7, the transmission frame timing is shifted by one count later (rightward in FIG. 7), so that the frame timing based on the transmission frame timing is the same. It will be delayed by one count. Thereby, in the next frame, the count value held by the count value holding unit 33 becomes 699 and becomes smaller. Then, by repeatedly performing such processing, the count value held by the count value holding unit 33 approaches 0 and finally becomes 0, and it is determined that the values match.

In this example, the process from the count value holding process by the count value holding unit 33 to the count value setting process by the count value setting unit 41 is performed for each frame. In other configuration examples, the count value setting unit 41 may transmit a count value smaller or longer than the count value of one frame as a transmission unit. It is also possible to adopt a configuration in which the processing set in the counter 42 is performed once in a plurality of frames.
In this example, the adjustment amount of the count value is 1 sample (in this example, 1 sample = 1/2 symbol). However, for example, the applied transmitter / receiver has the ability to absorb fluctuations in transmission timing. In such a case, the number of counts for timing adjustment (the amount of deviation from the reference count value of one frame) may be increased, thereby reducing the time required for inter-link frame synchronization processing. It is possible.

As described above, in this example, wireless stations (nodes) on which a plurality of wireless units are mounted are arranged in a mesh shape, wireless communication is established between the wireless units of each wireless station, and a wireless link is established in a mesh type. In the wireless system, the synchronization of the phase of the frame timing in the plurality of wireless units mounted on the same wireless station is established as follows.
That is, the phase difference between the frame timing of the first radio link and the frame timing of the second radio link other than the first radio link is detected, and the phase difference of the detected frame timing is eliminated or reduced. In addition, by controlling the phase of the frame timing of the second radio link, the phase of the frame timing of the first radio link is synchronized.

  Specifically, in the wireless unit of this example, the count value holding unit 33 holds the count value at the beginning of the frame timing of the first radio link, and the determination unit 34 holds the count value held by the count value holding unit 33. To determine the phase difference between the frame timing of the first radio link and the frame timing of the second radio link, and set the count value that the count value setting unit 41 counts based on the determination result by the determination unit 34, A transmission frame timing generation unit (in this example, a transmission unit counter 42 and a transmission unit decoder 43) generates a transmission frame timing whose frame length is controlled according to a value set by the count value setting unit 41, and generates a frame timing. Unit (in this example, the reception unit counter 31 and the reception unit decoder 32) are based on the transmission frame timing. Generating a frame timing of the radio link.

Thus, in the mesh type radio access system of this example, the phase of the frame timing can be synchronized between a plurality of radio links.
Accordingly, for a plurality of radio links whose phase of the frame timing is not synchronized, by controlling the phase of the frame timing to be synchronized and synchronizing the frame timing of the plurality of radio links, for example, a plurality of radio links It is possible to use the same frequency in and to improve the frequency utilization efficiency. In the frame timing control of this example, the frame timing can be synchronized between a plurality of wireless links autonomously without depending on an external system such as GPS.

In the wireless unit of this example, the timing acquisition unit is configured by the function of the timing control unit 23, and the determination unit is configured by the function of the reception unit counter 31, the function of the count value holding unit 33, and the function of the determination unit 34. The value setting means is configured by the function of the count value setting unit 41, and the timing is determined by the function of the transmission unit counter 42, the function of the transmission unit decoder 43, the function of the reception unit counter 31, and the function of the reception unit decoder 32. A generation unit is configured, and a timing output unit is configured by the function of the receiver decoder 32. Moreover, the timing control means is comprised by the determination means, the value setting means, and the timing generation means.
In this example, the designation means is configured by the function of the radio channel management unit 12 that designates the synchronization target for the radio unit by the synchronization target ID.

Here, the configurations of the wireless unit and the wireless communication system according to the present invention are not necessarily limited to those described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various devices and systems.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the wireless unit or the wireless communication system according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. The configuration controlled by doing so may be used, and for example, each functional means for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows the structural example of a radio station (node). It is a figure which shows the structural example of a radio | wireless unit. It is a figure which shows an example of the phase difference determination (in the case of a delay) of a frame timing. It is a figure which shows an example of the phase difference determination (in the case of advance) of a frame timing. It is a figure for demonstrating the operation example in a link structure. It is a figure for demonstrating the operation example in case there exists a phase delay. It is a figure for demonstrating the operation example in case there exists a advance of a phase. It is a figure which shows the structural example of a mesh type | mold radio | wireless access system. (A) is a figure which shows the structural example of a radio | wireless communications system, (b) is a figure which shows an example of the flame | frame of a TDD system. It is a figure which shows an example of a link structure. It is a figure which shows an example of the interference by the shift | offset | difference of a frame timing.

Explanation of symbols

  1, 51 to 55, 71, 91 to 93... Node (radio station) 11, 96, 97 .. wireless unit, 12 .. radio channel manager, 13 .. common bus, 21 .. reception baseband unit , 22 .. Transmission baseband unit, 23 .. Timing control unit, 31 .. Reception unit counter, 32 .. Reception unit decoder, 33 .. Count value holding unit, 34 .. Judgment unit, 41. , 42 .. Transmitter counter, 43 .. Transmitter decoder, 61-64, 72, 94, 95 .. Link, 81 .. Base station device, 82 .. Terminal device, 101, 102.

Claims (2)

In a wireless unit that is provided in the same wireless station and performs wireless communication with each other wireless station,
Timing acquisition means for acquiring the timing of a frame in wireless communication performed by another wireless unit;
Timing control means for controlling the timing of the frame in the wireless communication performed by the self unit so that the difference between the timing of the frame in the wireless communication performed by the self unit and the timing of the acquired frame becomes small;
A wireless unit comprising: The wireless unit according to claim 1, wherein
The timing acquisition means acquires the timing of a frame in wireless communication performed by another wireless unit that is a target for synchronization provided in the same wireless station,
The timing control means is performed by the self unit based on a result of the determination, a determination means for performing a determination on a difference between a frame timing in wireless communication performed by the self unit and a timing of the acquired frame. Value setting means for setting a value for reducing the difference between the timing of the frame in wireless communication and the timing of the acquired frame, and wireless communication performed by the self unit based on the set value Having timing generation means for generating frame timing in
A wireless unit characterized by that.

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