WO2001001642A1 - Procede et dispositif de radiocommunications - Google Patents
Procede et dispositif de radiocommunications Download PDFInfo
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- WO2001001642A1 WO2001001642A1 PCT/JP2000/003874 JP0003874W WO0101642A1 WO 2001001642 A1 WO2001001642 A1 WO 2001001642A1 JP 0003874 W JP0003874 W JP 0003874W WO 0101642 A1 WO0101642 A1 WO 0101642A1
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- Prior art keywords
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- unit
- user
- downlink
- uplink
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5603—Access techniques
- H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
- H04L2012/5607—Radio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5629—Admission control
- H04L2012/5631—Resource management and allocation
- H04L2012/5632—Bandwidth allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5672—Multiplexing, e.g. coding, scrambling
- H04L2012/5675—Timeslot assignment, e.g. TDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
- H04L2012/5679—Arbitration or scheduling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
- H04L2012/5681—Buffer or queue management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
Definitions
- the present invention relates to a wireless communication device using an ATM (Asynchronous Transfer Mode).
- ATM Asynchronous Transfer Mode
- FIG. 1 is a schematic diagram showing a configuration of a frame used in a conventional wireless communication system.
- the configuration of one frame consists of an access channel (Ac h) 11 followed by a control channel (Cch) 12 and a user channel (Uch) 13 in the first half.
- the access channel (Ac h) 14 is followed by the control channel (C ch) 15 and the user channel (Uch) 16.
- Access channel 11 and access channel 14 include two time slots, a downlink time slot (A D ) and an uplink time slot (Au).
- the downlink of ACh is a broadcast channel for various control information and a channel used for instructing a mobile station to allocate Cch.
- the uplink of Ac h is a random access channel for acquiring C ch.
- the control channel (Cch) 12 is an uplink control channel
- the control channel (C ch) 15 is a downlink control channel.
- C ch is Uch Establish Z release Sends and receives Uch control information of Z switching and messages related to C ch switching control.
- the user channel (Uch) 13 and the user channel (Uch) 16 are used for downlink time slots for the base station to transmit ATM cells and the like to the mobile station, and for the mobile station to communicate with the base station. It includes upstream time slots for transmitting ATM cells and the like.
- the base station manages the time slots of all control channels (C ch) and user channels (U ch).
- the base station determines the time to be used by each mobile station from the user channel (Uch) 13 and the user channel (Uch) 16 according to the user's request. Allocate slots.
- the base station does not uniquely specify the Uch time slot for the uplink and downlink, but at the time of channel assignment, according to the user information transmission rate.
- the communication bandwidth requested by the user is set by specifying the number of Uch time slots for uplink / downlink independently of the radio channel control unit.
- the mobile station Immediately after power-on, the mobile station establishes AcH synchronization with the base station having the highest reception level, and then transmits a Cch establishment request message by random access using the uplink Ach.
- the base station that has received this notifies the base station of the Cch time slot number to be used by searching for an empty Cch and transmitting a Cch assignment message.
- Each base station is assigned upper and lower 1C ch.
- Each base station constantly transmits control information using this C ch. Based on the call control information, the base station notifies the mobile station of a Uch time slot corresponding to the communication speed requested by the user, using a Uch allocation instruction message.
- the base station manages the relationship between the Uch time slot number and the Cch or mobile station number, and manages the channels used for the Cch and Uch for each mobile station.
- a millimeter wave wireless ATM-LAN method uses the uplink based on the random access method in the reservation stage and the polling method in the subsequent information transmission stage.
- the polling in the above method includes periodic polling (polling for periodically transmitting a polling signal to each user) and aperiodic polling (polling for randomly transmitting a polling signal to each user). Rings are used according to the quality of service (QoS) of user information.
- QoS quality of service
- the base station sets information such as the polling cycle, priority, and polling time in the polling scheduler. Further, the base station calculates the polling time of each user based on the periodic polling, and updates the contents of the polling scheduler. Thereafter, the base station sends a polling signal to each user based on the updated polling scheduler. Each user transmits a transmission waiting data frame according to the polling signal transmitted from the base station as described above.
- the base station performs the aperiodic polling between the periodic polling.
- the first conventional scheme has a frame configuration in which the uplink time slot and the downlink time slot are randomly included in U ch.
- a guard time with a long time width is required as a countermeasure for interference between the uplink time slot and the downlink time slot. Therefore, in the first conventional method, it is necessary to provide a large number of guard times as a whole, and therefore, there is a problem that the frame utilization rate deteriorates and the system capacity decreases.
- the first conventional method channel assignment based on the traffic in the uplink and downlink is not performed. For this reason, the traffic (transmission At the time of asymmetric communication with different transmission speeds, when comparing a line with a high transmission speed and a line with a low transmission speed, the line utilization rate is lower on the line with the lower transmission speed. Therefore, the first conventional method has a problem that the system capacity cannot be improved.
- An object of the present invention is to provide a wireless communication device that faithfully copes with asymmetric traffic and QoS of a user and improves a frame utilization rate and a system capacity. This object is achieved by allocating a time slot to be used by each communication partner based on the status of the transmission waiting cell for the communication user for the uplink and for the downlink.
- FIG. 1 is a schematic diagram showing a configuration of a frame used in a conventional wireless communication system
- FIG. 2 is a schematic diagram showing a configuration of a communication system using a wireless communication device according to the first embodiment of the present invention
- FIG. 3 is a schematic diagram showing a frame format used in the wireless communication device according to the first embodiment
- FIG. 4 is a schematic diagram showing a configuration of a time slot in a user channel of a frame format used in the wireless communication device according to the first embodiment
- FIG. 5 is provided with the wireless communication device according to the first embodiment.
- FIG. 6 is a block diagram showing a configuration of a wireless channel control unit in the wireless communication device according to the first embodiment
- FIG. 7 is a block diagram showing a configuration of a user channel management unit in the wireless communication apparatus according to the first embodiment
- FIG. 8A is a schematic diagram showing a channel assignment method by a channel assignment unit in the wireless communication apparatus according to the first embodiment
- FIG. 8B is a schematic diagram showing a channel assignment result by a channel assignment unit in the wireless communication apparatus according to the first embodiment
- FIG. 9A is a schematic diagram showing a channel assignment method by a channel assignment unit in a wireless communication apparatus according to Embodiment 2 of the present invention.
- FIG. 9B is a schematic diagram showing a channel assignment result by the channel assignment unit in the wireless communication apparatus according to the second embodiment:
- FIG. 1OA is a schematic diagram showing a channel assignment method by a channel assignment unit in a wireless communication apparatus according to a third embodiment of the present invention
- FIG. 10B is a schematic diagram showing a channel assignment result by a channel assignment unit in the wireless communication apparatus according to the third embodiment
- FIG. 11 is a schematic diagram illustrating a frame configuration example according to a fourth embodiment of the present invention
- FIG. 12 is a schematic diagram illustrating a frame configuration example according to a fifth embodiment of the present invention.
- the wireless communication device performs communication using ATM. Do.
- FIG. 2 is a schematic diagram illustrating a configuration of a communication system using the wireless communication device according to the first embodiment of the present invention.
- Communication employing, for example, a TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) system is performed between the base station (BTS) 101 and the mobile station (MS) 102.
- BTS base station
- MS mobile station
- FIG. 3 is a schematic diagram illustrating a frame format used in the wireless communication device according to the first embodiment.
- the unit frame (one frame) consists of an access channel (Ac h) 201, an uplink control channel (C ch) 202, a downlink control channel (C ch) 203, and a downlink user channel. (UCh) 204 and an uplink user channel (UCh) 206.
- Ac h access channel
- C ch uplink control channel
- C ch downlink control channel
- UCh uplink user channel
- UCh uplink user channel
- the access channel 201 includes a down time slot (A D ) and an up time slot (Au).
- the downlink time slot is used to broadcast various control information to the base station 101 and each mobile station 102, and indicates the control channel allocated to each mobile station 102. It is used for On the other hand, the uplink time slot is used for acquiring each mobile station 102 control channel.
- the uplink control channel 202 and the downlink control channel 203 are used by the base station 101 and each mobile station 102 for controlling information on establishment, release and switching of each user channel, and switching control of each control channel. This is the channel used to communicate information about
- the uplink control channel 202 is a channel used to broadcast a broadcast signal for broadcasting the contents of the transmission buffer of each mobile station 102 to the base station 101 for each frame. is there.
- This broadcast signal includes the presence or absence of transmission data (such as ATM cells) in the transmission buffer of each mobile station 102, the status of transmission cell waiting (the number of waiting cells or the level expressing the number of waiting cells), and special information. It reflects high quality of service requirements. Thereby, base station 101 can grasp the transmission status of each mobile station 102.
- the downlink control channel 203 is a channel used to broadcast the position of the user channel allocated to each mobile station 102 in accordance with the base station 101 user channel allocation result described later. It is.
- the downlink user channel 204 is a channel used by the base station 101 to transmit an ATM cell or the like to each mobile station 102.
- the uplink user channel 206 is a channel used to transmit an ATM cell or the like to each mobile station 102 base station 101.
- the number of time slots included in each of the downlink user channel 204 and the upward user channel 206 is not fixed, and is determined based on the user channel allocation result described later. The position is determined.
- FIG. 4 shows an example of the configuration of each time slot in such a user channel.
- FIG. 4 is a schematic diagram showing a configuration of a time slot in a frame format user channel used in the wireless communication device according to the present embodiment.
- Each time slot is configured to include a guard time (GT) 301 for protection, a bit timing reproduction code (BTR) 302, a unique word (UW) 303, and eight cells 304.
- GT guard time
- BTR bit timing reproduction code
- UW unique word
- the configuration of the time slot in the above-mentioned user channel is an example, and can be changed as appropriate according to the communication status, the application, and the like.
- FIG. 5 is a block diagram showing a configuration of a base station including the wireless communication device according to the present embodiment.
- the antenna section 401 receives a signal transmitted from each mobile station 102 and sends it to the RF section 402.
- the length section 402 performs frequency conversion on the signal transmitted from the antenna section 401, and sends the frequency-converted signal to the modulation / demodulation section 403.
- the modulation / demodulation unit 4003 converts the signal sent from the RF unit 402 Then, demodulation such as ⁇ 4 ⁇ 3 ⁇ SK method is performed, and the demodulated signal is sent to TDMA section 404.
- TDMA section 404 performs normal TDMA processing on the signal sent from modem section 403. That is, first, the TDMA unit 404 extracts data for an instant slot at a predetermined timing from the signal transmitted from the modulation / demodulation unit 403, extracts a unique word from the extracted data, and establishes synchronization.
- the TDMA unit 404 extracts various information from the data for the one time slot, and sends the extracted information to the IF unit 405 or the wireless channel control unit 406 according to the content of the information. . Specifically, if the information extracted as described above is the various types of control information as described above transmitted by the access channel 201 and the control channel 202, the TDMA unit 404 extracts the information as described above. The transmitted information is sent to the wireless channel control unit 406. On the other hand, when the information extracted as described above is audio information transmitted by the user channel 206, the TDMA unit 404 sends the information extracted as described above to the IF unit 405.
- the IF unit 405 sends the information sent from the TDMA unit 404 to PSTN (Public Telephone Network) or ISDN (Integrated Services Digital Network).
- PSTN Public Telephone Network
- ISDN Integrated Services Digital Network
- IF section 405 sends a signal transmitted from the PSTN (Public Telephone Network) or ISDN (Integrated Services Digital Network) to TDMA section 404.
- PSTN Public Telephone Network
- ISDN Integrated Services Digital Network
- the TDMA unit 404 performs a normal TDMA process on a signal including various control information transmitted from the wireless channel control unit 406 or a signal transmitted from the IF unit 405 according to the above-described frame format content (FIG. 3). I do. That is, the TDMA unit 404 adds a control signal such as a unique code to a signal including various control information transmitted from the wireless line control unit 406 or a signal transmitted from the IF unit 405 in accordance with the frame format. 1 Times mouth After creating the data for one time slot, the created data for one time slot is inserted into a predetermined slot at a predetermined timing and sent to the modem 403.
- Modulation / demodulation section 403 modulates the signal sent from TDMA section 404 according to the ⁇ -4QPSK method or the like, and sends the modulated signal to RF section 402.
- RF section 402 performs frequency conversion on the signal transmitted from modulation / demodulation section 403, and transmits the frequency-converted signal to each mobile station 102 through antenna section 401.
- the call control unit 407 performs call connection control and user management such as user (mobile station) authentication.
- the wireless channel control unit 406 controls the above-described antenna unit 401, RF unit 402, modem unit 403, octave unit 404, IF unit 405, and call control unit 407.
- the internal configuration of the wireless channel control unit 406 will be described with reference to FIG.
- FIG. 6 is a block diagram showing an internal configuration of radio channel control section 406 provided in base station 101 including the radio communication device according to the present embodiment.
- Radio line control section 406 mainly includes communication quality monitoring section 501, mobile station management section 502, and radio resource management section 503.
- the communication quality monitoring unit 501 constantly monitors the communication quality of each channel, and performs switching or release processing of a channel whose communication quality has deteriorated.
- the mobile station management unit 502 manages the telephone number of each mobile station 102 and the channel used by each mobile station 102.
- the radio resource management unit 503 manages allocation of radio resources. That is, the radio resource management unit 503 uses the various types of control information sent from the TDMA unit 404 to assign channels to each mobile station 102, and sends the channel assignment result to the TDMA unit 404. More specifically, the radio resource management unit 503 includes an access channel (Ac h) management unit 504, a control channel (C ch) management unit 505, and a user channel (Uch) management. Unit 506.
- Ac h access channel
- C ch control channel
- Uch user channel
- the access channel management unit 504 manages the access channel 201. In particular, when the access channel management unit 504 receives a signal for requesting acquisition of a control channel transmitted from each mobile station 102 through the TDMA unit 404, the control channel management unit 504 A request is made to 05 to assign a control channel to each mobile station 102. Thereafter, the access channel management unit 504 receives the control channel allocation result for each mobile station 102 from the control channel management unit 505, and transmits this result through the TDMA unit 404. Send to mobile station 102.
- the control channel management unit 505 manages the uplink control channel 202 and the downlink control channel 203. That is, when receiving a request from the access channel management section 504 to allocate a control channel to each mobile station 102, the control channel management section 505 selects each mobile channel from the time slots in each control channel. Determine the time slot to be assigned to station 102. Thereafter, the control channel management section 505 sends the above allocation result to the access channel management section 504.
- control channel management unit 505 When the control channel management unit 505 receives a broadcast signal, which is transmitted from each mobile station 102 for each frame and broadcasts the contents of the transmission buffer through the TDMA unit 404, Then, a signal requesting the assignment of the time slot in is transmitted to the user channel management unit 506 together with the broadcast signal. Thereafter, when receiving the above allocation result from the user channel management section 506, the control channel management section 505 sends the allocation result to each mobile station 102 through the TDMA section 404.
- the user channel management unit 506 manages the uplink user channel 206 and the downlink user channel 204. In particular, the user channel management unit 506 allocates a time slot to be used by each mobile station 102 in the uplink user channel 206 and the downlink user channel. Sa More specifically, the user channel management unit 506 determines the number of cells waiting for transmission of each mobile station 102 (hereinafter referred to as “uplink transmission status”), the number of cells waiting for transmission of the base station 101. Requests a special QoS for the number of cells (hereinafter referred to as “downlink transmission status”) and for the transmission waiting cells of each of the mobile station 102 and the base station 101. A time slot to be used by each mobile station 102 is assigned based on the situation indicating how many cells waiting to be transmitted are included.
- the user channel management unit 506 manages each user channel, so that it can be always grasped.
- FIG. 7 is a block diagram showing a configuration of a user channel management unit 506 provided in a base station 101 provided with the wireless communication device according to the present embodiment.
- the user channel management section 506 mainly includes a downlink transmission status buffer 601, a channel allocation section 602, and an uplink transmission status buffer 603.
- the downlink transmission status buffer 6001 stores information on the downlink transmission status and the QoS request status of the base station, and sends the information to the channel allocation unit 602.
- the uplink transmission status buffer 603 stores information on the uplink transmission status and the mobile station's QoS request status, and allocates the above information to the channel. Send to part 6 02. As described above, the uplink transmission status and the QoS request status of the mobile station are based on information transmitted to the base station 101 using the uplink control channel 202 of each mobile station 102. Yes, it is sent to the upstream transmission status buffer 603 via the control channel management unit 505.
- the channel allocating unit 602 receives information on the downlink transmission status and the base station QoS request status from the downlink transmission status buffer 601, and the uplink transmission status buffer 603 from the uplink transmission status buffer 603. Receive information on the transmission status and the mobile station's QoS request status. Further, the channel allocating section 602 allocates channels in the downlink user channel 204 and the uplink user channel 206 based on the received information.
- a specific channel assignment method by the channel assignment unit 62 will be described with reference to FIG. 8A.
- FIG. 8A is a schematic diagram showing a channel assignment method by a channel assignment unit 622 provided in base station 101 having the radio communication apparatus according to the present embodiment.
- the channel allocating unit 602 as a channel allocation method, fairly allocates a channel without distinguishing between the uplink and the downlink according to the transmission status of both the uplink transmission status and the downlink transmission status; Channel allocation is performed in consideration of the mobile station's QoS requirement and the base station's QoS requirement, and a method that achieves is adopted. This will be described with reference to FIG. 8A.
- the upper row shows the uplink transmission status and the mobile station's QoS request status stored in the downlink transmission status buffer 6001
- the lower row shows the uplink transmission status buffer 6
- the uplink transmission status and the QoS request status of the base station stored in 03 are shown. That is, in the upper row, the buffer contents indicating the status of cells waiting to be transmitted to users (mobile stations) 1 to user m of the base station 101 are: ⁇ , And the lower row shows a buffer indicating the status of cells waiting to be transmitted to base station 101 owned by user 1 to user m.
- the key contents are shown in ⁇ ⁇ ,, ⁇ ⁇ ⁇ .
- the sofa A D 1 includes three cells waiting to be transmitted by the base station 101 to the user 1
- the buffer U m includes the user m in the base station 1.
- the figure shows that no transmission waiting cell for transmission to 01 is included.
- the double intersection ring 7001 is a ring that allocates channels fairly to all users (hereinafter referred to as “normal ring”) and a special user who needs to perform real-time and high-speed communication such as images. And a ring to which channels are assigned preferentially (hereinafter referred to as “high-speed ring”), and the above two rings alternately circulate.
- the normal ring is a ring located outside
- the high-speed ring is a ring located inside the normal ring.
- Channel allocating section 602 allocates channels according to a certain rule, as described below. First, the channel allocating unit 602 determines whether each user is a user to be allocated (loop check) in the order along the double intersection ring 701. The users to be assigned are all users having cells waiting to be transmitted during the normal ring, and only special users having cells waiting to be transmitted during the high-speed ring.
- channel allocating section 602 allocates a unit subslot, ie, one subslot (for one cell), to the user to be allocated, and reduces the number of cells waiting to be transmitted in the buffer of this user by one.
- the channel allocating section 602 determines each user while circulating along the double crossing ring 701 until the maximum number of channels accommodated in one frame, that is, the maximum number of subslots that can be accommodated in a frame. Allocate to subslots.
- the above channel assignment is performed for each frame.
- the loop check is started from the position at the end of the previous frame in the double intersection ring 701. If there are no cells waiting to be sent, Terminates the allocation in that frame.
- channel allocating section 602 separates all the sub-slots allocated to each user into two sub-slots: an upstream sub-slot group and a downstream sub-slot group. After that, the channel allocating section 602 groups the subslots allocated to each user into one, and forms a unit time slot, that is, one time slot (variable length slot).
- the service priority of a special user can be changed by changing the frequency of switching between the normal ring and the high-speed ring.
- FIG. 8B is a schematic diagram showing a channel assignment result by channel assignment section 62 provided in base station 101 having the wireless communication apparatus according to the present embodiment.
- the i-th user in the uplink and the j-th user in the downlink are special users, and the loop check is started from the first user in the downlink in normal ring circulation.
- the channel allocating section 602 determines whether the first user in the downlink direction is a user to be allocated. Since the first user in the downlink has a cell waiting to be transmitted, the channel allocating unit 62 determines that the first user in the downlink is the user to be allocated. Therefore, channel allocating section 602 allocates one subslot (UCD 1 ) to the first user in the downlink direction and reduces the number of cells waiting for transmission in the buffer of this user by one. Similarly, the channel allocating unit 602 selects the j-th user in the downlink and the downlink
- UCD 1 subslot
- the channel allocator 6 02 circulates along the double intersection ring 7 01, The m-th user in the up direction is determined. Since the m-th user in the uplink does not have a cell waiting to be transmitted, the channel assignment unit 622 does not assign the m-th user as an assignment target and determines the next user.
- channel allocating section 6002 determines the ith user in the uplink and the first user in the uplink as users to be allocated, and assigns each of these users one subslot (U Cu.i ) And one subslot (uc LT 1 ), and reduce the number of cells waiting to be transmitted in these users' buffers by one.
- the loop check cycles through the high-speed ring (the first lap). That is, the channel allocating section 602 determines only the j-th user in the downlink direction and the ith user in the uplink direction as users to be allocated, and assigns one sub-slot (UC DJ ) and one sub-slot to each of these users. Allocate slots (UC UJ) and reduce the number of cells waiting to be sent in the buffers of these users by one. At this point, there are still cells waiting to be sent, so the loop check cycles through the normal ring (the second lap). Similarly, the channel assignment section 6 0 2 allocates downlink first user and downlink j th user, respectively 1 subslot (UC D 1) and single subslot (UC D, j) . Thereafter, since the user in the up direction does not have a cell waiting for transmission, the loop check circulates on the high-speed ring (second lap).
- the special user that is, the j-th user in the down direction and the i-th user in the up direction do not have a cell waiting for transmission, so the loop check circulates through a normal ring (third lap). .
- channel allocating section 602 allocates one subslot (UCD 1 ) to the first user in the downlink direction.
- the channel allocating unit 602 ends the allocation in this frame. Note that the allocation in this frame has been completed by the first user in the downlink direction. So the allocation in the next frame starts with this user.
- channel allocating section 602 separates all sub-slots allocated to each user into an uplink sub-slot group and a downlink sub-slot group. After that, in each subslot group, the subslots allocated to each user are grouped into one time slot (variable length slot) for each user. Further, the channel allocating section 602 stores the uplink time slot and the downlink time slot summarized as described above in the downlink user channel 204 and the uplink direction in the frame shown in FIG. 3, respectively. Insert into user channel 206. As a result, in the user channel, the uplink time slot and the downlink time slot are separated by the boundary line 205, so that the required guard time is suppressed. As a result, the frame is used effectively.
- the channel allocating section 602 allocates the channel fairly without distinguishing between the uplink and the downlink according to the respective transmission statuses of the uplink transmission status and the downlink transmission status. I have. Further, channel allocating section 602 allocates a channel in consideration of the respective QoS requirements of the mobile station and the base station. The above is a specific channel assignment method by the channel assignment unit 602.
- the signal transmitted by each mobile station 102 is transmitted to the base station 10
- the signal received by the antenna section 401 is frequency-converted and sent to the modulation / demodulation section 403.
- the modulation / demodulation section 4003 the signal whose frequency has been converted by the RF section 402 is subjected to demodulation such as the TZ4QPSK method and the like, and the TDMA section
- the TDMA unit 404 extracts data from the signal demodulated by the modulation / demodulation unit 403 every predetermined time slot at a predetermined timing, and then extracts various information from the extracted data.
- the information thus extracted is sent to the radio channel control unit 406 or the IF unit 405 according to the information content.
- the information extracted as described above is sent to the IF unit 405 when the content is information such as voice transmitted by the uplink user channel 206, and the content is Are the above-mentioned various control signals transmitted by the access channel 201 and the uplink control channel 202, the control signals are transmitted to the radio channel control unit 406.
- the IF unit 405 information such as voice transmitted from the TDMA unit 404 is sent to PSTN (Public Telephone Network) or ISDN (Integrated Services Digital Network).
- PSTN Public Telephone Network
- ISDN Integrated Services Digital Network
- a signal transmitted from the PSTN (Public Telephone Network) or ISDN (Integrated Services Digital Network) is transmitted to the TDMA section 404 via the IF section 405. Further, various control signals output by the wireless channel control unit 406 are sent to the TDMA unit 404 according to the above-described frame format.
- PSTN Public Telephone Network
- ISDN Integrated Services Digital Network
- the signal transmitted from the IF section 405 or the signal transmitted from the wireless channel control section 406 undergoes normal TDMA processing in accordance with the above-described frame contents. That is, various control signals transmitted from the IF unit 405 or signals such as audio transmitted from the wireless channel control unit 406 are added with control signals such as unique codes according to the above-described frame contents, and are transmitted over an instant slot. After that, the data is sent to the modem unit 403 inserted in a predetermined slot.
- the signal transmitted from the TDMA section 404 is subjected to modulation such as the 7TZ4QP SK method and transmitted to the RF section 402.
- modulation such as the 7TZ4QP SK method
- RF unit 402 The signal modulated by the modulation / demodulation unit 403 is subjected to frequency conversion and transmitted to each mobile station 102 via the antenna unit 401.
- radio channel control unit 406 will be described according to the frame contents shown in FIG.
- a control signal for acquiring a control channel from each mobile station 102 is sent to the access channel management unit 504 shown in FIG. 6.
- a signal to allocate a control channel to each mobile station 102 is sent to the control channel management unit 505.
- the control channel management unit 505 After a control channel is allocated to each mobile station 102, the result of this allocation is sent to access channel management section 504.
- the access channel management unit 504 sends the control channel allocation result (in the previous frame) to each mobile station 102 and various control information to each mobile station. Sent to 102.
- the control channel management unit 505 receives a notification signal for notifying the contents of the transmission buffer from each mobile station 102. In response to this, the control channel management unit 505 sends, to the user channel management unit 506, a signal requesting allocation of a time slot in each user channel, together with the broadcast signal.
- the broadcast signal that is, the uplink transmission status and the mobile station Q 0 S request status are stored in the uplink transmission status buffer 603 shown in FIG. 7, and the time slot allocation is performed. Is transmitted to the channel allocating section 602 shown in FIG. At the same time, the downlink transmission status buffer 601 stores the downlink transmission status and the QoS request status of the base station.
- the channel allocating unit 602 determines the uplink user channel 206 and the uplink user channel 206 based on the uplink transmission status and the mobile station's QoS request status, and the downlink transmission status and the base station's QoS request status.
- a time slot to be used by each mobile station 102 is allocated. The specific assignment method is as described above.
- the channel assignment result is sent from the channel assignment unit 602 to the control channel management unit 505.
- the control channel manager 505 that is, the channel allocator 602 transmits the channel allocation result for each user channel to each mobile station 102.
- the downlink user channel 204 information such as voice transmitted from the IF unit 405 is transmitted to each mobile station 102 based on the frame content, that is, the above-described channel allocation result.
- each mobile station 102 communicates with the base station 101 based on the allocation result in each user channel broadcast on the downlink control channel 203. Transmit information such as voice.
- the number of uplink time slots and the number of downlink time slots in a user channel are determined by the number of cells waiting for transmission (communication amount in the uplink) of each mobile station and the base station It is determined based on the number of cells waiting to be transmitted (downward communication volume) and the QoS of each mobile station and base station. A corresponding channel assignment is performed. Therefore, communication corresponding to asymmetric traffic and QoS of the user can be realized without affecting the frame utilization rate and the system capacity. (Embodiment 2)
- the first embodiment guarantees the user's QoS requirement to the maximum.
- the configuration of the wireless communication apparatus according to the second embodiment is the same as that of the first embodiment except for the channel allocating unit, and a detailed description thereof will be omitted.
- differences between the channel assignment unit of the wireless communication apparatus according to the present embodiment and the channel assignment unit according to the first embodiment will be described with reference to FIG. 9A. The description of the same parts as in the first embodiment is omitted.
- FIG. 9A is a schematic diagram illustrating a channel assignment method by a channel assignment unit in a base station including the wireless communication device according to the second embodiment of the present invention.
- the channel allocator determines, for each special user, a threshold Q th 801 for the number of cells waiting to be transmitted, and the number of cells waiting for transmission and the threshold Q th
- the channel allocating unit sets the flag of a special user having a number of cells waiting for transmission greater than the threshold Q th 801 among the above special users to “1”, and sets the threshold Q th 8
- the channel allocating unit performs the above-described loop check along the high-speed ring until the flag content of the special user becomes “0”. Execute.
- the loop check when the flag contents of the special user are all “0” is the same as in the first embodiment.
- FIG. 9B is a schematic diagram showing a channel assignment result by the channel assignment unit in the base station provided with the radio communication device according to the present embodiment.
- the i-th user in the up direction and the j-th user in the down direction are special users.
- the threshold Q th 801 is set to “2”. It should be noted that the content of the threshold value Q th 801 can be changed as appropriate according to the communication state, application, and the like.
- the channel assignment unit sets the flag of the i-th user in the upstream direction to “0” and sets the flag of the j-th user in the downstream direction to “1”. And At this point, since there is a user whose flag content is “1”, the channel assignment unit performs a loop check along the high-speed ring.
- the channel allocation unit downlink j th user, allocates Sabusu port Tsu Bok the (UC DJ), reduce the number of transmission waiting cells in the buffer for this user by one.
- the number of cells waiting to be transmitted by the j-th user in the downlink direction is equal to or smaller than the threshold Q th801 , and the channel assignment unit sets the flag of this user to “0”.
- the channel assignment unit ends the priority assignment for the special user as described above. Thereafter, the channel allocating unit performs the same normal allocation as in the first embodiment. As a result, subslots are allocated to each user in the order shown in FIG. 9B. As shown, a transmission waiting cell Le threshold Q th 8 0 1 greater than the number for the downlink of the j-th (special) user, service Busuro' allocated preferentially It is clear that
- a channel is preferentially assigned to a special user in consideration of the number of cells waiting for transmission of the special user, so that real-time and high-speed communication of images and the like is performed. Reliable communication can be guaranteed for special users who need it. At the same time, it is possible to realize asymmetric traffic and communication corresponding to the QoS of the user without affecting the frame utilization and system capacity. (Embodiment 3)
- the QoS requirement of the user is guaranteed to the maximum.
- the configuration of the wireless communication apparatus according to the third embodiment is the same as that of the second embodiment except for the channel allocating unit, and a detailed description thereof will be omitted.
- differences between the channel allocating unit of the wireless communication apparatus according to the present embodiment and the channel allocating unit according to the second embodiment will be described with reference to FIG. 1OA. The description of the same parts as in the second embodiment is omitted.
- Channel allocation unit for each of the special user, the threshold W th 9 0 1 for transmit latency transmission waiting cells, and a transmission wait time waiting for transmission cell and the threshold W th 9 0 1 A flag indicating the result of the comparison is set. More specifically, the channel allocating unit sets the flag of a special user whose transmission waiting time of the cell waiting for transmission is longer than the threshold W th 901 among the special users to “1”, and sets the flag of the cell waiting for transmission to “1”. transmission waiting time is the flag of the threshold W th 9 0 1 the following special user is set to "0".
- the transmission waiting time of the transmission waiting cell refers to the information on the transmission waiting cell possessed by a particular user at the time of starting the channel allocation, as shown in FIG.
- the time from the time when the data is stored in the buffer 601 to the time when the channel allocation unit starts the channel allocation corresponds to the total time of all the cells waiting for transmission.
- the channel allocating unit records the transmission waiting time for all the transmission waiting cells belonging to the special user.
- the time is defined as the time from when a special user sends information about a cell waiting to be sent to when the base station receives this information. It can be changed as appropriate.
- FIG. 10B is a schematic diagram showing the result of channel assignment by the channel assignment unit in the base station provided with the radio communication apparatus according to the present embodiment.
- the transmission waiting time for one transmission waiting cell of each user is assumed to be uniform.
- the i-th user in the up direction and the j-th user in the down direction are special users. Further, the threshold value W th901 is set as the transmission waiting time for two transmission waiting cells.
- the channel allocating unit checks the transmission waiting time of the transmission waiting cell of the special user, sets the flag of the i-th user in the upward direction to “0”, and sets the flag of the j-th user in the downward direction to “0”. 1 ”. At this point, since there is a user whose flag content is “1”, the channel assignment unit performs a loop check along the high-speed ring.
- the channel allocation unit downlink j th user, allocates an substream opening Tsu preparative (UC DJ), reduce the number of transmission waiting cells in the buffer for this user by one.
- the transmission waiting time of the transmission waiting cell at the j-th user in the downlink direction becomes equal to or less than the threshold value W th901 , and the channel assignment unit sets the flag of this user to “0”.
- Subsequent operations are the same as in the second embodiment, and a description thereof will not be repeated.
- subslots are allocated to each user in the order shown in FIG. 10B.
- the sub-slot is preferentially assigned to the j-th (special) user in the downlink direction where the transmission waiting time of the transmission waiting cell is longer than the threshold value W th9101 . It is clear that.
- the special user has Channels are given priority in consideration of the transmission waiting time of the transmission waiting cell, so reliable communication can be guaranteed for special users who need to perform real-time and high-speed communication such as images. .
- a temporary dedicated access channel is provided to a transmission notification signal reflecting the transmission waiting state of the transmission buffer of each wireless terminal for each frame using CDMA technology.
- 100 1 is one frame
- 1002 is a multi-control channel using CDMA technology
- 1003 is a user and user-assigned channel using TDMAZCDMAZOFDM and other technologies
- 1004 is a dedicated control channel for uplink and downlink.
- 1005 is an uplink Z downlink random access channel (only used when the mobile station is powered on)
- 1006 is an uplink Z downlink access and control channel
- 1007 is a downlink user channel
- 1008 is an uplink user channel
- 1009 is a variable uplink Z downlink user channel boundary.
- the frame configuration of the present embodiment includes an access channel (Ach) 1005, a control channel (Cch) 1004, and a user channel (Uch) 1007Z 1008, as in the conventional TDD scheme.
- Ac h and C ch are transmitted and received using the CDMA method. As a result, effective use of channels is achieved.
- the frame is divided into two parts, a terminal transmission waiting status notification signal 1002 and a user information 1003.
- the former uses the CDMA system and provides a temporary dedicated multi-control channel to the transmission waiting state notification signal reflecting the transmission waiting state of the transmission buffer of each wireless terminal, and notifies the base station without collision.
- This temporary control channel does not interfere with other channels in the absence of signal due to the soft capacity of the CDMA. This makes it possible to use channels effectively.
- Assignment of the multi-control channel 1004 is performed as follows.
- the base station provides a power-on access channel and a channel code broadcast channel 1005, and obtains an access channel code of each mobile station at the time of calling, receiving, and handover.
- the base station establishes a correspondence table between the address (or user ID) of each mobile station and the multi-control channel code as shown in Table 1 below, and manages the assignment, search, and use of the multi-control channel.
- the mobile station uses the power-on access channel 1005 to transmit the user address or channel ID to the base station using a random access protocol only when the mobile station is powered on.
- the base station requests a dedicated multi-control channel code. Note that the symbol A in Table 1 indicates the identification address of the terminal being accessed, and similarly, X indicates an unaccessed terminal, C indicates a used multi-control channel code, and C X indicates an unused channel code.
- the base station uses the channel code broadcast channel to notify the terminal of the idle channel code.
- the base station notifies the mobile station of the code of the directly available multi-control channel using the channel code broadcast channel 1002.
- the handover destination base station searches for a vacant multi-control channel, sends the code of the assigned multi-control channel to the serving base station, and the serving base station uses the channel code broadcast channel. Notify the mobile station.
- the base station notifies the base station of the transmission waiting notification signal of the wireless terminal in a collision-free manner using the temporary dedicated control channel, so that the base station can wait for the transmission of the wireless terminal.
- the status can be grasped instantaneously, and the user channel is allocated according to the transmission / reception volume and QoS of each channel, taking into account the downlink channel arrival status of each user and the uplink transmission waiting status of each uplink channel comprehensively. be able to.
- useless channel occupation, collision of the terminal transmission packet and the transmission wait state notification signal are eliminated, and highly efficient wireless communication is enabled.
- control channel is divided into a dedicated control channel and a shared control channel in the fourth embodiment, so that the control channel is effectively used.
- 1101 is one frame
- 1102 is a multi-control channel using CDMA technology
- 1103 is a user and a user using TDMA / CD MAZO FDM and other technologies.
- User assigned channel 1 104 is for uplink Z downlink special user
- the dedicated control channel 1105 is an uplink and downlink normal user control channel (channel for random access to data etc.)
- 1106 is an uplink Z downlink random access channel
- 1107 is an uplink / downlink access channel.
- a control channel, 1108 indicates a downlink user channel
- 1109 indicates an uplink user channel
- 11010 indicates a variable uplink Z downlink user channel boundary.
- the frame according to the present embodiment includes A ch, C ch, and U ch.
- the C ch according to the present embodiment is divided into a dedicated control channel (C nD ) 1104 for moving images and a shared control channel (C SD ) 110 5 for data.
- the dedicated control channel 1104 is used in the same manner as the control channel in the above-described embodiment, but the shared control channel 1105 is used for data and other users who are not strict about delay characteristics.
- the uplink control signal is transmitted using a random access protocol.
- control channels since two types of control channels are provided according to delay characteristic requirements, it is possible to compensate for the quality requirements of the user and to effectively use the control channels.
- a power-on access channel and a channel code notification channel are provided in the multi-control channel, and each call is made when calling, receiving, and handing over.
- the access channel code of the mobile station can be obtained.
- the power-on access channel and the channel code broadcast channel are not set, the control channel code of each wireless terminal is determined in advance, and the terminal waits for transmission using the corresponding multi-control channel during transmission. The situation can be notified to the base station.
- the user address or channel ID is transmitted to the base station using a random access protocol using the power-on access channel only when the mobile station is powered on.
- a dedicated multi-control channel code can be obtained.
- the base station can notify the mobile station of the code of the vacant multi-control channel directly by using the channel code broadcast channel.
- the handover destination base station searches for a vacant multi-control channel, sends the assigned multi-control channel code to the local base station, and the local base station transmits the channel code broadcast channel. It can be used to notify the mobile station.
- Embodiments 4 and 5 above if control channels can be assigned to each terminal, communication systems other than the CDMA system can be adopted. Therefore, it is preferable to adopt the CDMA method.
- the present invention it is possible to provide a wireless communication apparatus that can faithfully cope with asymmetric traffic and QoS of a user, and that improves a frame utilization rate and a system capacity.
- the transmission notification signal reflecting the transmission wait state of the uplink transmission buffer of each wireless terminal is made collision-free using a temporary dedicated control channel for each frame.
- the base station can instantly grasp the transmission waiting state of the wireless terminal.
- user channels are allocated according to the transmission / reception volume and QoS of each channel without distinguishing between uplink and downlink. . Therefore, it is possible to provide a highly efficient wireless communication device by preventing useless use of a channel and collision of a terminal transmission packet and a transmission request signal.
- the present specification is based on Japanese Patent Application No.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU52476/00A AU5247600A (en) | 1999-06-24 | 2000-06-15 | Radio communication device and radio communication method |
EP00937231A EP1109365A1 (en) | 1999-06-24 | 2000-06-15 | Radio communication device and radio communication method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP11/178737 | 1999-06-24 | ||
JP17873799A JP2000236343A (ja) | 1998-12-15 | 1999-06-24 | 無線通信装置及び無線通信方法 |
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WO2001001642A1 true WO2001001642A1 (fr) | 2001-01-04 |
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PCT/JP2000/003874 WO2001001642A1 (fr) | 1999-06-24 | 2000-06-15 | Procede et dispositif de radiocommunications |
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EP (1) | EP1109365A1 (ja) |
CN (1) | CN1245000C (ja) |
AU (1) | AU5247600A (ja) |
WO (1) | WO2001001642A1 (ja) |
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US6940827B2 (en) | 2001-03-09 | 2005-09-06 | Adaptix, Inc. | Communication system using OFDM for one direction and DSSS for another direction |
US8089855B2 (en) | 2004-06-04 | 2012-01-03 | Qualcomm Incorporated | Transmission of overhead information for broadcast and multicast services in a wireless communication system |
KR20060057459A (ko) * | 2004-11-23 | 2006-05-26 | 삼성전자주식회사 | 폴링 기반무선 랜 시스템의 패킷 처리 방법 및 수퍼프레임의 스케줄링 방법 |
WO2008084445A2 (en) * | 2007-01-09 | 2008-07-17 | Nokia Corporation | Apparatus, method and computer program product providing dynamic sharing of resources between uplink and downlink allocations for separately coded users |
US8537789B2 (en) | 2007-08-01 | 2013-09-17 | Harris Corporation | Mobile ad-hoc network providing communication latency reduction features and related methods |
US8155093B2 (en) | 2007-08-01 | 2012-04-10 | Harris Corporation | Mobile ad-hoc network providing desired link delay offset without guard times and related methods |
Citations (4)
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JPH07107546A (ja) * | 1993-09-30 | 1995-04-21 | Matsushita Electric Ind Co Ltd | 無線通信システム |
JPH07162391A (ja) * | 1993-12-13 | 1995-06-23 | Nippon Motorola Ltd | Tdmaシステム |
JPH10242981A (ja) * | 1997-02-27 | 1998-09-11 | Fujitsu Ltd | ダイナミックタイムスロット割り当てシステム |
JP2000236343A (ja) * | 1998-12-15 | 2000-08-29 | Matsushita Electric Ind Co Ltd | 無線通信装置及び無線通信方法 |
-
2000
- 2000-06-15 WO PCT/JP2000/003874 patent/WO2001001642A1/ja not_active Application Discontinuation
- 2000-06-15 AU AU52476/00A patent/AU5247600A/en not_active Abandoned
- 2000-06-15 EP EP00937231A patent/EP1109365A1/en not_active Withdrawn
- 2000-06-15 CN CN00801385.3A patent/CN1245000C/zh not_active Expired - Fee Related
Patent Citations (4)
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JPH07107546A (ja) * | 1993-09-30 | 1995-04-21 | Matsushita Electric Ind Co Ltd | 無線通信システム |
JPH07162391A (ja) * | 1993-12-13 | 1995-06-23 | Nippon Motorola Ltd | Tdmaシステム |
JPH10242981A (ja) * | 1997-02-27 | 1998-09-11 | Fujitsu Ltd | ダイナミックタイムスロット割り当てシステム |
JP2000236343A (ja) * | 1998-12-15 | 2000-08-29 | Matsushita Electric Ind Co Ltd | 無線通信装置及び無線通信方法 |
Non-Patent Citations (1)
Title |
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MASARU ISHIKI ET AL.: "Hitaishou traffic wo kouryo shita musen resource wariate houhou", TECHNICAL RESEARCH REPORT OF THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, CS99-54, vol. 99, no. 140, 25 June 1999 (1999-06-25), pages 37 - 42, XP002946536 * |
Also Published As
Publication number | Publication date |
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CN1245000C (zh) | 2006-03-08 |
AU5247600A (en) | 2001-01-31 |
EP1109365A1 (en) | 2001-06-20 |
CN1318240A (zh) | 2001-10-17 |
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