TW201101907A - Wireless communication system, base station, wireless communication method, and program - Google Patents

Abstract

The base station of the present invention comprises: a decision section comparing, for a terminal as a controlled object, the minimum guaranteed rate of the terminal with a predetermined threshold value, and determining the minimum physical rate for a guaranteed band based on the result of comparison; and a control section performing the above control, for the terminal as the controlled object, under an assumption of executing an adaptive modulation with the minimum physical rate determined by the decision section.

Description

201101907 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a wireless communication system, a base station, a wireless communication method, and a program. [Prior Art] IEEE (Institute of) by WiMAX ( Worldwide Interoperability for Microwave Access) Forum [WiMAX Forum]

Electrical and Electronic Engineers, based on the 802.16e standard, has a WiMAX System Profile. The wireless communication 0 system of WiMAX is disclosed, for example, in Patent Document 1.

In WiMAX wireless communication system, data transmission and reception are performed in sub-frames (Sub-ftame), and OFDM is used in multiplex mode (〇rth〇g〇nal).

The frequency division multiple access (OFDM) mode is adopted, and the TDD (Time Division Duplex) mode is adopted in the duplex mode. The described OFDMA method cuts the time direction by a sub-channel (-channel) cutting frequency direction in a symbol to indicate the time slot (Slot) unit of the cut region, and allocates the bandwidth to the terminal. MS (Sulphur Stati〇n). The so-called TDD method uses the DL (Down Link 'downlink) connection and the ul (Up Link) connection between the Bs (Base Stati〇n) and the MS of the base station at the same frequency, and switches the DL pair on the time axis. Frame and ul sub-frame. An outline of a frame structure in a wireless communication system for WiMAX will be described with reference to Fig. 1 . ^ As shown in Fig. 2, the frame structure of WlMAX can switch DL sub 5-frame (downlink sub-frame) and UL sub-frame (uplink sub-frame) (TDD mode) on the time axis. Another between the DL sub-frame and the UL sub-frame is called TTG (Transm Transition Gap) and RTG (Receive/T_mit).

Transition Gap, the interval between receiving/transmitting transition gaps. In the DL sub-frame and the UL sub-frame, the bandwidth is allocated to the MS in time slot units, and the allocated bandwidth is used to transmit data (〇FDMA mode). • In the DL sub-frame, the Preamble area containing the Pilot signal is placed in the front, and 201101907 is followed by a MAP area including signals indicating which time slot is allocated to each MS in the DL sub-frame and the UL sub-frame. The subsequent area (DLBurst 'downlink) is allocated to each MS as the bandwidth for transmitting DL data. On the other hand, in the UL sub-frame, a Ranging area including a Ranging signal is arranged in front, and the Ranging signal is used to perform Ranging on the MS side to adjust the time point, frequency, and power. The subsequent area (ULBurst 'upstream cluster) is allocated to each MS as the bandwidth for transmitting UL data. i. The wireless communication system of WiMAX corresponds to an adaptive modulation method. The so-called adaptation ten-modulation method adaptively controls the modulation mode and coding rate of DL data and UL data between BS and MS in response to the transmission environment of MS. In wiMAX, the data transfer speed corresponding to the combination of the modulation mode and the coding rate is limited. This data transfer speed is called the physical rate. And the WiMAX wireless communication system also corresponds to the q〇s (Quality〇fService, Quality of Service) level. That is, in the wireless communication system of WiMAX, it will belong to

UGS (Unsolicited Grant Service), ERT-VR (Extended Real Time-Variable Rate Service), RT (Real Time) -VR, NRT (Non Real Time) -VR The QoS level is guaranteed by the VIS bandwidth. Here, with reference to Fig. 2, an adaptive modulation action for an MS belonging to a QoS class requiring bandwidth guarantee in a wireless communication system for WiMAX will be described. In the 'Fig. 2', the following figure shows the positional relationship between the BS and the jS#1~MS#3 belonging to the q〇s level of the required bandwidth guarantee, and the above figure shows the positional relationship in the position of the following figure. The BS transmits the DL sub-frame to MS#1~]VIS#3 (the same applies to FIGS. 3 and 6 below). Referring to Fig. 2, MS#1 to MS#3 are located in the vicinity of the BS in the initial state, that is, near the center of the unit cell (state 1). When the MS is located near the center of the cell, data can be transmitted at a high physical rate. Therefore, in state 1, the BS is applied as a combination of modulation modes and coding rates of MS#1 to MS#3, for example, 16QAM of high physical rate (Quarature AmpUtude)

Modulation, quadrature amplitude modulation) 3/4 (the first half indicates the modulation mode, and the second half 201101907 indicates the coding rate. The same applies hereinafter). Below, _ 16QAM 3/4 area 16QAM area. The number of slots required for the bandwidth is guaranteed to vary with the physical rate. For low physical rates, more slots are required. In state 1, it applies to the 16QAM 3/4 physical rate direction of MS#1~MS#3, so the number of slots required to ensure the bandwidth of MS#1~MS#3 is small. Therefore, the BS can receive all MS#1 to MS#3' and the idle bandwidth of the DL subframe increases. A is taken, MS#1 leaves the 16QAM area and moves toward the edge of the unit cell (state 2). Ο 〇

In this way, the BS is adapted to be the modulation of MS#1 and the combination of coding by the adaptive modulation method. For example, QpSK (plus & her phase hfKeying 'orthogonal phase shift keying) /2. In the following, the area where QpsK 1/2 is applied is called the QPSK area. And the number of slots required for the QpsK certificate MS#1 bandwidth of Ms#1 is increased. ^ ^ In the potential state 1, the DL sub-frame has a lot of idle bandwidth, so even if the number of slots is increased when the bandwidth is widened in state 2, the BS can still store all #3. However, because MS#1 occupies the bandwidth ‘the idle bandwidth of the DL sub-frame is reduced 〇 then 'MS#2 moves from the 16QAM area toward the qPSK area (state 3). Thus, the BS is applied as a combination of the modulation mode and the coding rate of Nabian by the adaptive modulation method, and the QpsK 1/2 of the low physical rate. In state 2, the idle bandwidth is small in the sub-frame, so in state 3, the bandwidth of the physical rate of ‘"QPSK 1/2 is allocated to MS#2, resulting in a decrease in the physical rate of ~2. There is no time slot that can be assigned to MS#3, so the time slot cannot be allocated until the next subframe. In the wireless communication system of WlMAX, in order to avoid the above problem, the control of AdmiSS1〇n C〇1 is performed in r t Ί. In this case, the so-called Admission 2nd 乂 适 适 , , , , , , , BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS BS Tune _ is what (four) 3 in its own base.兮The result of the judgment judges that it is impossible to store the MS and does not implement the physical rate change 201101907. Referring to Fig. 3, the wireless communication system for wiMAX will be described with respect to the MS of the Q〇S荨 class belonging to the frequency control system, accompanied by the adaptive modulation operation of the Admission Control. Further, the positional relationship of the lower diagram in Fig. 3 is the same as that of Fig. 2. Referring to Fig. 3, MS#1 to MS#3 are the same as Fig. 2, and are located in the 16QAM area in the initial state (state 〇. At this time, with FIG. 2, MS#1 to MS#3, the idle bandwidth is increased. 'MS#1 from the 16QAM area to the qpsk area (distance 2). Thus, the BS implements Admissi〇nc for MS#1, and judges MS#1 by QpSK 1 by means of =〇_ /2 When adaptive modulation is implemented, =No can assign the corresponding QPSK 1/2 physical rate miscellaneous to MS#. At this time, under the condition ^1, the inter-frequency bandwidth is more in the DL sub-frame, so the BS is %8. #1 determines that the frequency can be allocated to the secret itself and the platform. Therefore, even in the state 2, the BS can also be MS#1~MS#3. However, the response #1 occupies the bandwidth, the sub-frame The frequency is less than nine. Then 'MS#2 moves from the 16QAM area to the QPSK area (shape 3). (5) If this is the same as when the MS#1 is used, A is performed for the biliary 2 - in the state 2, The idle bandwidth of the DL t-shirt frame is small, so it is judged that t is given to the question 2. Therefore, the MS#2 &s#i com ί 无法 无法 无法 之 之 之 之 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 被 物理 物理 物理 物理MS#2 has the same priority as MS#1, so it is unfair. [Patent Document] [Patent Document 1] Japanese Laid-Open Patent Publication No. 2007-266719 (Invention) The invention is based on the premise that the application is carried out. Called by _speed casting low QPSK1/2 201101907,, when an MS is located at the edge of the unit grid, although the bandwidth of the corresponding tfSK 1/2 can be guaranteed, but there is an unacceptable rate of entry greater than QPSK 1/ 2 is the subject of the premise of service. It is premised on the use of QPSK1/2 with the lowest physical rate. When the MS with demand rate is included, even in the case of implementing Admission, it will be squeezed by the lion, and there will be more adaptability. The purpose of this is to provide a wireless communication system, first, base σ, wireless communication method and program to solve the above problems. Ο ο ( The means to solve the problem) The wireless communication pure & include the following: The terminal; and the base station will adapt the modulation method adaptively.

Semce 'service quality' level of the terminal object f, the nature of the change (4) in the * of the * (4) plus < The wireless communication system is characterized by the base station contains., the rate and the minimum of the pre-set Guarantee the speed and low material rate; and determine the lowest physical vocabulary of the bandwidth guarantee based on the comparison result. (4) 彳 = The base station of the present invention determined by the grain portion will implement the adaptive change cycle and the overall adaptive modulation. The terminal in the terminal and the terminal for controlling the object, and the Qos level of the guaranteed bandwidth is guaranteed to be stored in the rate and predetermined: 25 'terminal f; low guaranteed speed low physical rate; And the comparison result determines the most control unit of the bandwidth guarantee, and the terminal to be controlled is determined to perform the adaptive change by performing the adaptive modulation at the lowest speed of 201101907 determined by the determination unit. The modulation method and the coding rate of the electric 5W base port will be in the suitable machine, the change of the qgS 4 belonging to the wide guarantee and the implementation of the implementation of the adaptive view is; ^ can _ ^ edge of the terminal Machine, will be judged, it is characterized by The control of the base station of 1_ itself is determined by the actual decision step, and the final rate of the control object is matched with the preset value. The secret of the machine guarantees the lowest physical rate; and the comparison determines the bandwidth guarantee according to the comparison result. The control step is regarded as a premise that adaptive modulation is performed on the final object rate of the control object. The minimum adaptability of the H is determined by the f-modulation mode and the combination of the coding rates themselves. The pre-set ratio of the arrest rate: the minimum guaranteed minimum physical rate of the terminal; and the control procedure for determining the bandwidth guarantee based on the comparison result, and the adaptive modulation of the physical rate of the controlled object is considered as determined by the decision The lowest (the effect of the invention) λ 仃 this control. In the present invention, it is only in the case of the terminal frequency control, in the case of determining the terminal control of the control object that implements the adaptive modulation level, the minimum standard of the base station for receiving and cultivating itself by the corresponding control σ The physical rate uses the minimum guaranteed rate of the terminal as the premise. Therefore, the bandwidth of the terminal of the control object is guaranteed, and the effect of the service based on the minimum premise of the minimum guaranteed rate can be ensured. When it is possible to carry out the terminal with the minimum physical rate and the physical rate of the corresponding control object as the premise, the lowest standard threshold of the rate and the physical rate, 201101907 even if the above control is implemented In the case of the machine, the effect of the bandwidth is occupied. A terminal for avoiding control can also be obtained. [Embodiment] Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. Ο ❹ ^ n郷g towel, turn to the wireless communication secret WiMAx line of the overnight system as an example to illustrate, but the invention is not limited by this. *"', as shown in Fig. 4, the wireless communication system of the present embodiment = _3 of the terminal. Further, in Fig. 4, although the description is simple, the mouth =

The Jit station gas is one and three units, respectively, but the present invention is not limited thereto. And stupid 1~#3 is a terminal that belongs to the Q0S level of bandwidth guarantee. The BS includes a wireless communication unit u and a base station operation unit ο. The wireless communication unit 11 performs helmet line communication with MS #1 to #3.卩^ The lowest physical speed determining unit 13 of the lowest physical speed shirt (4) tendering unit determines the most recorded scale of the frequency material for each hall #1 to #3. In addition, the lowest _ scale determines that the green portion 14 is adaptively modulating the MS, which belongs to the Ms of the QoS control target that needs to be seen as the QoS, and implements the judgment and the rate determination unit I3.义 g Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad Ad The width of the ^= Control section is determined to be stored in the base station itself. Although the ii is not shown in the figure ’, the base station operation unit 12 also includes a mechanism equivalent to the BS used in the disk general MS#1. For example, in a mechanism that is handled by a seat service #ί 7 or a mechanism that is produced between MS#1 and #3. However, such a mechanism is not the same as that of the present invention, and a well-known mechanism can be used, and detailed description is omitted. 9 201101907

"The ten parts of the old body can be used, and the well-known mechanism can be used, and the detailed description is omitted. The operation of the wireless communication system according to the present embodiment will be described below. [Operation to the generation of the service flow] - Start, refer to the figure first. 5 Explain that the generation of the service between yeah and Shi #1 to #3 is taken as an example of the fact that the service is generated between Bs and ms#i. First, the BS performs between MS#1 and MS#1. Used to log ]^8#1 to the ASKC Access Service Network's access service network (not shown) and CSN (Connective

Network registration processing of the Service Network (connection service network) (step S2〇1). Once the network login process is completed, it is transformed into a service flow generation process. In the service flow generation process, first, the BS transmits to the MS#1 a DSA (including information such as the minimum reserved rate of MS#1) required to provide services to the MS#1 (for example, information such as MS#1 minimum reserved traffic rate). Dynamic Service Addition - REQ (Request) message (step S202). Upon receiving this 'MS#1, a DSA-RSP (Response) message is transmitted to the BS as a response to the DSA-REQ message (step S203). Further, when MS#1 wants to change the additional information specified by the BS, the additional information of the change is included in the DSA-RSP message and the BS is replied to, and when the additional information is not changed, only the BDSSA-RSP message body is replied. Thereafter, the BS transmits a DSA-ACK (Acknowledgement) message intended to receive the end of the DSA-RSP message to the MS #1 (step S204). The above service process generation process ends. [Adaptation adjustment action accompanying Admission Control] 201101907 For a long time, "A" and Figure 6 are about the adaptability of the accompanying Admission Control. In addition, in FIG. 6, the positional relationship of the following figure is the same as FIG. 2 and FIG. Referring to Fig. 6, it is understood that 'MS#1 to MS#3 are located at 16 (3 ΑΜ area (state 1) in the initial state. At this time, the BS generates the above-mentioned service flow generation processing with each of MS#1 to MS#3. Here, at the time when the service flow generation processing ends, the lowest physical rate determination unit 13 of the BS compares the minimum guaranteed rate with the preset threshold value for each of the MS#1 to #3', and determines the lowest physics based on the comparison result. rate.

Further, the threshold value of the low physical rate determining unit 13 is set for each combination of the corresponding modulation method and the coding rate or the lowest physical rate of the QoS class. For example, if the threshold of QPSK 3/4 is 2MbpS and the threshold of 16QAM 1/2 is 6Mbps, if the minimum guaranteed rate of an MS exceeds 2Mbps, the physical rate of the lowest physical rate is QPSK 3/4, and the minimum guaranteed rate is More than 6 Mbps, which determines the lowest physical rate is 16QAM 1/2 physical rate. Therefore, for each MS#1~MS#3, Admissi〇n occurs.

In the case of Control, the bandwidth can be estimated in advance by the maximum value determined by the most meticulous rate determining unit 13, as shown in Fig. 6. Next, MS#1 moves from the 16QAM area toward the qpSK area (state 2). Thus, in the case of MS #1, the Admission Control unit 14 of bs performs the Admission Control by performing adaptive modulation as 刖 k ' by the lowest physical rate determined by the event rate determining unit 13. = The minimum physical rate for the premise is not the physical rate of QpsK ^ The lowest fresh physical rate of the most healthy material of the soil. Therefore, the bandwidth of the low physical rate is guaranteed, and the minimum color can be allowed to proceed.

The rate is the service of W. If the physical rate of the boat officer's second farm is higher than the physical rate of QPSK 1/2, MS 2 is guaranteed. * The number of slots is not more than the number of slots in the system and QPSK1/2. The port can be accommodated even if it is suitable for Ms#1. It can also be stored in MS#1. Occupy bandwidth. 11 201101907 Next, MS#2 moves from the 16QAM area to the QPSK area (state 3). In the case of the MS#2, the Admission Control Unit 14 of the BS performs the Admission Control by performing the adaptive adjustment as the lowest physical rate determined by the object rate determining unit 13. The minimum physical rate premised at this time is also the same as that of MS#1. It is not the same as the county, and the lowest standard of the most healthy card for the ride should be allowed, and the service with the minimum physical rate as the premise. If you see that the minimum physical rate is higher than the physical rate of QpsK 1/2, and the number of slots required to ensure the MS#2 bandwidth is the same as the qPSK 1/2. No more than that. In the state 2, the bandwidth is not occupied: P, adaptive adjustment for MS#2 can also be stored as 2, in the case of the i disk] = no unfair phenomenon. It can also avoid the application of #1 and the hall, so it can also be allocated to Ms#3. (4) See the less trt, in the actual _ state + ' is the control ratio of AdmissiGn CGntlOl (4) according to the minimum guaranteed rate of the Ms and the preset threshold compared to the minimum physical rate, the lowest physics determined The rate of real-time quotient-to-sex modulation is considered as the premise to implement Admission Contrd. " Law A^miSSiGn CG coffee 1 is the minimum physical rate non-certificate rate of the premise, and the minimum guarantee service of the riding system is controlled by the lowest physical rate. The physical rate of the dance image 1/2, the guarantee system control can not be more than 兮i it is compared with the number of slots when the system qpsk 1/2 is changed - ΐϊ 系 system = object - to adapt to the need for high physical t frequency ^ There is a possibility that it can also reduce the amount of hairpins ^ 12 201101907, and exclude unfair phenomena such as registration. And because of the production ^ can also be allocated to the bandwidth without the need for bandwidth guarantee, belong to the time ^

Semce, try to deliver the service) and other (10) level halls. Although the above is already involved in the fine-grained n said that the Japanese forest (four), 形态 form limited. Cooked _ technologists can make various changes that can be understood in this essay or in detail. For example, in the present embodiment, the method of the present invention is described as an example, but the method of the present invention can also be applied to the UL. Moreover, the method performed in the BS of the present invention can also be applied to a program for causing a computer to execute. The program can be stored in a memory medium or externally via a network. The application is based on the priority of the present application, which is hereby incorporated by reference in its entirety in the entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all all [Simple Description of the Drawings] Fig. 1 is a diagram showing the structure of a frame of WiMAX. 2 is a diagram showing an example of an adaptive modulation operation in a related wireless communication system. Figure 3 is a diagram showing another example of an adaptive modulation action in an associated wireless communication system. Figure 4 is a block diagram showing the configuration of a wireless communication system according to an embodiment of the present invention. Fig. 5 is a flow chart showing an example of an operation from the network registration processing to the monthly flow generation processing in the wireless communication system shown in Fig. 4. Fig. 6 is a view showing an example of an adaptive modulation operation in the wireless communication system shown in Fig. 4. [Description of main component symbols] 11: Wireless communication unit 12: Base station operation unit 13: Minimum physical rate determination unit 14: Admission control unit 13 201101907 21: Wireless communication unit 22: Terminal operation unit S201 to 204: Procedure

Claims (1)

201101907 VII, the scope of application for patents: base station, for the implementation of adaptive change of the modulation mode, the total number of 入4 ==: ίί) end of the machine modulation; = no can be stored in its own base = system 'execution _ The line pass, the system is characterized in that the base station comprises: Ο ο 3. If the terminal of the helmet-wound image of claim 1 or 2 is applied, the corresponding pair of the line can be correspondingly Widely allocated, the control department (four) f health rate rate 4. If you apply for full-time! To 3 shots _:, . . . Taiwan. The decision department sets the threshold for each minimum physical rate. ... line pass ^糸, system 'where, the 5 · kind of base station, for the implementation of adaptive change of the terminal shot, belongs to the ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί ί = fixed terminal, the minimum guaranteed speed of the terminal: ί; = inter-value comparison 'determine the bandwidth guarantee 4 control unit according to the comparison result' to perform adaptive adjustment on the lowest physical rate of the terminal of the control object 15 201101907 6. For the base station of Patent Application No. 5, where ^ value, sand pre-mosquito & 合 =: 3⁄4 rate · set for each - minimum material it rate H is the base station of the project. Among them, the decision-making department, the base station is designed to implement the minimum required physical bandwidth, === change, and the minimum physical rate of the base correction in the machine; and the comparison of σ海... If you decide the bandwidth guarantee rate, 执^Ιίί^. Determining the pre-cut group by the lowest physical speed of the decision ' Μ ' at the determination of the physical rate of the decision step. 11. In the helmet line step of claim 9 or 1 of the patent, the control The object's terminal and ^ ° will be ^' shore, controlled by $= low physical rate bandwidth plus '==: 12. For example, the application of the patent circumference of the 9th to 11th right - ε. Physical scale method, , 中, belongs to modest (2) 16 201101907 Whether it can be stored in the control of its own base station; the terminal speed fixing terminal, the minimum guarantee of the terminal is ϊ 物, __ fruit _ wide guarantee to robbery = The terminal of the _ object is controlled by the minimum tilt premise of the decision.最低 The minimum guarantee word 'the towel' is in the mosquito office, whether the health rate is the low value of the low value _ speed % value of the secret money of the first mosquito: in the miscellaneous procedure, 0 frequency 'is assigned, judge ; put it 'in its own' base, the needle, in the eight-pattern: 〇17