JP5108683B2 - Communication slot allocation method for communication system, communication system, base station, and terminal - Google Patents

Description

  The present invention relates to a communication slot allocation method, a communication system, and a base for a communication system for performing communication by allocating downlink and uplink communication slots (bands) by base station centralized control between a base station and one or more terminals. Related to stations and terminals. In particular, the present invention is suitable for uplink communication slot allocation in a wireless system based on the WiMAX (Worldwide Interoperability for Microwave Access) standard, which is a wireless access standard using a microwave band.

  WiMAX, which has attracted attention as a wireless access system in a wide area in recent years, differs from IEEE802.11 standards (11b, 11a, 11g, 11n, etc.) that are wireless LANs in home / office environments and limited public areas. It is possible to realize a wide area service with a radius of several kilometers from the base station. As WiMAX standards, IEEE802.16-2004 standard called non-patent document 1 called FWA (Fixed Wireless Access) connected by fixed wireless, IEEE802.16e-2005 standard called mobile WiMAX that can communicate while moving, etc. Standardization with further evolution is ongoing.

  This WiMAX includes a plurality of physical / MAC layer specifications. In the orthogonal frequency division multiple access (OFDMA) standard adopted in the physical layer, the downlink and uplink are distributed by time division duplex (TDD), and the first half of a predetermined cycle. A downlink subframe is arranged, and an uplink subframe is arranged in the latter half.

  FIG. 5 shows a frame configuration in WiMAX. In the figure, the horizontal axis represents time and the vertical axis represents frequency. In OFDMA, the entire frequency band is divided into a number of subcarriers, and the time direction is engraved in OFDM symbol units of a predetermined time length. Each terminal is assigned a slot defined by a combination of a subcarrier (or subcarrier group (subchannel)) and an OFDM symbol number, and performs communication by accommodating signals in bursts in the slot.

  One frame includes a downlink subframe 11 and an uplink subframe 12. In the downlink subframe 11, a signal from the base station to each terminal is continuously transmitted, and a preamble signal 13 for performing channel estimation or the like is arranged at the head of the section. Further, following the preamble signal 13, a frame control header (FCH) 14, DL-MAP 15 which is downlink map information, and UL-MAP 16 which is uplink map information are arranged. Allocation of downlink bursts 17 containing data or control information is performed.

  In general, since a large number of burst allocations are performed in the downlink subframe 11 and the uplink subframe 12, information elements corresponding to the allocation are continuously arranged following the FCH. For example, the UL-MAP 16 includes slot map information corresponding to a number of uplink connections, and the map information corresponding to a certain connection is referred to as UL-MAP IE 16a. At this time, in order to compress the overhead of the control information and improve the efficiency, the map information is described in a display format called “Compressed MAP” in which a large number of pieces of map information are overlapped. In addition, within the WiMAX standard, apart from this compression MAP, a standard MAP that does not compress header information is also defined, but there is no specific usage, and the overhead actually increases. In general, compressed MAP is used.

  FIG. 6 shows an overview of uplink burst allocation by UL-MAP in WiMAX.

  In WiMAX, the allocation position of the uplink burst is indicated in the Allocation Start Time field in the UL-MAP 16 illustrated in FIG. In general, this allocation avoids the uplink subframe 12 of the same frame in which the UL-MAP 16 is accommodated, and points in the uplink frame 12 of the next frame in order to secure a delay time required for signal processing. For example, the DL-MAP 15-1 of the nth frame assigns the downlink burst 17-1 in the same frame, while the UL-MAP 16-1 of the nth frame is the uplink burst in the (n + 1) th frame. 12-2 is assigned.

FIG. 7 shows a conventional bandwidth allocation processing procedure in the base station.
In the figure, when the base station starts bandwidth allocation (scheduling) processing (S101), the base station searches for a connection with a transmission request or transmission reservation from the terminal side under a predetermined priority rule (S102), It is determined whether or not there is a connection (S103). If there is a connection to be allocated, the required bandwidth is calculated (S104), time and frequency resources (slots) corresponding to the calculated required bandwidth are allocated (S105), and a compressed UL-MAP is created (S106). . Next, the remaining bandwidth of the uplink frame is determined (S107). If there is a remaining bandwidth in the uplink frame, the process returns to step S102, and the processing up to step S106 is repeated.

  Applicable if the uplink allocation for the connection to be allocated is completed by the above processing, and it is determined in step S103 that there is no connection to be allocated, or if there is no remaining uplink bandwidth in step S107. The remaining bandwidth excluding the bandwidth such as FCH and compressed UL-MAP is calculated (S108), and the bandwidth allocation of the downlink frame is performed in the remaining bandwidth (S109). Then, a compressed DL-MAP is created (S110), the bandwidth allocation process is terminated, and the process waits until the bandwidth allocation process for the next frame (S111).

  The above is the outline of the uplink and downlink bandwidth allocation processing procedure in WiMAX. The internal processing of a terminal that has received this UL-MAP is basically not subject to standardization and therefore differs depending on the terminal manufacturer. However, the processing is very complicated compared to wireless LAN standards such as IEEE802.11b / a / g. Therefore, it is practical to process software of a relatively low layer such as a physical layer in real time, and then temporarily accumulate and perform software processing.

FIG. 8 shows an example of a conventional uplink burst transmission processing procedure in the terminal.
In the figure, when receiving the UL-MAP (S121), the terminal analyzes the contents of the UL-MAP (S122), determines whether or not the terminal has bandwidth allocation (S123), and if there is bandwidth allocation. Preparation for uplink transmission is started (S124). First, it is determined whether or not there is data that can be transmitted for the corresponding connection in the transmission buffer (S125). If there is transmission data that can be transmitted, the transmission data is read (S126), and predetermined MAC layer processing (for example, Various header information assignment, bit string and OFDM symbol correspondence management, etc.) are performed (S127), and physical layer processing (for example, error correction coding, interleaving, modulation processing, IFFT processing, guard interval addition, etc.) is performed (S128). . Thereafter, it waits until the final transmission timing (S129), performs transmission processing when the transmission time comes (S130), ends the processing, and waits for the next frame (S131).

FIG. 9 shows an example of a conventional downlink burst reception processing procedure in the terminal.
In the figure, when receiving the DL-MAP (S141), the terminal analyzes the contents of the DL-MAP (S142), determines whether or not the terminal has bandwidth allocation (S143), and if there is bandwidth allocation. Downlink reception processing is started (S144). Error detection is performed on the received data (S145). If an error is detected, the data is discarded (S146), the process is terminated, and the process waits until the next frame is received (S150). On the other hand, if no error is detected in the received data, it is determined whether or not it is control information with reference to the header of the received data (S147). If the received data is control information, the control information is processed (S148). If the received data is user data other than the control information, the data is output (S149). Wait until processing (S150).

WiMAX is a system suitable for providing a wireless access service in a wide area, and has attracted attention as an effective technique for eliminating a digital divide (information gap) in a depopulated area. When providing broadband services in such a sparsely populated area, voice-based services are also possible using the wireless access line. It can be considered to be accommodated in a radio access line. Here, telephone numbers such as “03-****-****” and “045-***-****” (commonly called “0AB-J number”) The fixed-line telephone service using the "" is called "090-****-****" and "050-****-****" are different from mobile systems and IP phones. As shown in Non-Patent Document 2, usage conditions are specified such that, for example, a transmission place can be specified or an emergency call can be handled.
IEEE Std 802.16-2004, "IEEE Standard for Local and metropolitan area networks, Part 16: Air Interface for Fixed Broadband Wireless Access Systems", chapters 6.3.7.2 to 6.3.7.5, 2004 http://itpro.nikkeibp.co.jp/free/NCC/denwa/20040521/1/

  The call quality equivalent to that of a fixed telephone defined as the usage condition of the 0AB-J number includes a delay time, and generally it is necessary to satisfy a delay of 20 milliseconds or less in the access system. However, WiMAX performs transmission in frame units with a period of 5 ms, and the processing is also complicated. Therefore, unlike wireless LANs that use CSMA (Carrier Sense Multiple Access) and are simple in processing, the delay time is 20 ms. The hurdles were very tough.

  Further, regarding the uplink, as described in FIG. 6, “Allocation Start Time” in the UL-MAP 16 indicates the next frame, and as a result, from step S124 to step S130 in the process of FIG. The time is very long. This is because a wasteful waiting time is generated in step S129, but existing terminals are mainly best-effort data communication, and there is no need to reduce such a delay.

  Therefore, in order to provide 0AB-J quality telephone service using WiMAX, it is essential to reduce the delay time, and it is not necessary to make a major improvement on the terminal side. Therefore, a device for reducing the delay generated in step S129 is required.

  The present invention provides a communication slot allocation method, a communication system, a base station, and a terminal of a communication system capable of reducing transmission processing delay on the terminal side in the uplink and realizing high-quality communication with low delay. Objective.

In the communication slot allocation method of the communication system of the present invention, a base station and a plurality of terminals are connected via a communication line, a downlink region used for downlink communication from the base station to the terminal, and a terminal to the base station The base station divides a frame into uplink regions used for uplink communication, and the base station assigns a communication slot used for downlink transmission and a communication slot used for uplink reception. In a communication system that transmits to a terminal as map information, the terminal receives downlink map information and uplink map information, and performs downlink reception and uplink transmission using a communication slot indicated by each map information The base station assigns an allocation to the connection established with the terminal. The Uplink map information accommodates encapsulates the communication slot of the downlink assigned by the downlink map information, an uplink map information is the end time position of the communication slots in downlink that accommodates encapsulated downlink map information It is characterized in that it is arranged at a time position delayed by a predetermined time from the time position at which is arranged .

  A communication slot allocation method for a communication system according to the present invention is applied to a selected terminal among a plurality of terminals or to a selected connection among connections set between a base station and a terminal. The communication slot allocation method of the invention is applied.

  In the communication slot allocation method of the communication system according to the present invention, the downlink map information and the uplink map information use the bandwidth allocation control information composed of one or more combinations of frequency information, time information, and code information. The information uses compressed map information obtained by compressing the header information of a number of downlink map information, and the uplink map information encapsulated in the downlink communication slot uses standard map information that does not compress the header information. It is characterized by that. The compressed map information may be in a compressed DL-MAP format, and the standard map information may be in a standard UL-MAP format.

In the communication system of the present invention, a base station and a plurality of terminals are connected via a communication line, and a downlink region used for downlink communication from the base station to the terminal and uplink communication from the terminal to the base station are used. The base station divides the frame into the uplink areas to be used, and the base station allocates a communication slot used for downlink transmission and a communication slot used for uplink reception, and transmits them to the terminal as downlink map information and uplink map information, respectively. A communication system in which a terminal receives downlink map information and uplink map information, and receives a downlink and transmits an uplink using a communication slot indicated by each map information. In this case, the base station assigns an allocation to the connection set up with the terminal. The Uplink Map information comprises an uplink map information processing means for receiving encapsulated in the communication slot of the downlink assigned by the downlink map information, uplink map information processing unit encapsulates an uplink map information contained The end time position of the downlink communication slot is arranged at a time position delayed by a predetermined time from the time position where the downlink map information is arranged.

  The uplink map information processing means in the base station of the communication system of the present invention is selected for a selected terminal among a plurality of terminals or in a connection set between the base station and the terminal. Applied to the connection.

  The uplink map information processing means in the base station of the communication system according to the present invention is configured such that the downlink map information and the uplink map information include bandwidth allocation control information including one or more combinations of frequency information, time information, and code information. Used, the downlink map information uses compressed map information obtained by compressing the header information of a number of downlink map information, and the uplink map information encapsulated in the downlink communication slot does not compress the header information. The standard map information is used. The compressed map information may be in a compressed DL-MAP format, and the standard map information may be in a standard UL-MAP format.

In the base station of the present invention, a base station and a plurality of terminals are connected via a communication line, and a downlink region used for downlink communication from the base station to the terminal and an uplink communication from the terminal to the base station are used. The base station divides the frame into the uplink areas to be used, and the base station allocates a communication slot used for downlink transmission and a communication slot used for uplink reception, and transmits them to the terminal as downlink map information and uplink map information, respectively. A communication system in which a terminal receives downlink map information and uplink map information, and receives a downlink and transmits an uplink using a communication slot indicated by each map information. , Uplink map assigned to the connection set up with the terminal The broadcast includes an uplink map information processing means for receiving encapsulated in the communication slot of the downlink assigned by the downlink map information, uplink map information processing unit accommodates encapsulates uplink map information down The end time position of the communication slot of the link is arranged at a time position delayed by a predetermined time from the time position at which the downlink map information is arranged.

  The uplink map information processing means in the base station of the present invention is for a selected terminal among a plurality of terminals, or for a selected connection among connections set between the base station and the terminal. Applied.

  The uplink map information processing means in the base station of the present invention uses the bandwidth allocation control information consisting of one or more combinations of frequency information, time information, and code information as the downlink map information and uplink map information, The link map information uses compressed map information obtained by compressing the header information of a large number of downlink map information, and the uplink map information encapsulated and accommodated in the downlink communication slot does not compress the header information. It is the structure using. The compressed map information is in a compressed DL-MAP format, and the standard map information is in a standard UL-MAP format.

  When the terminal connected to the base station of the present invention receives the downlink communication slot assigned by the downlink map information and detects the encapsulated uplink map information, the uplink Means for transmitting data using an uplink communication slot assigned by the map information.

The present invention encapsulates the uplink map information assigned to the connection established between the base station and the terminal in the downlink communication slot assigned by the downlink map information, thereby accommodating the terminal. When the uplink map information accommodated in the downlink communication slot is grasped, the assignment of the uplink communication slot can be recognized.
Since the original uplink map information is arranged in front of the frame, the timing at which the terminal grasps the contents of the uplink map information has been advanced. However, in practice, the transmission process is not necessary even if the transmission process is started as early as possible, so that an unnecessary processing wait time is required. Therefore, by accommodating the uplink map information in the downlink communication slot allocated by the downlink map information as in the present invention, the uplink processing delay is reduced by the time difference that the terminal will know the allocation. Shortening can be achieved.
Also, the terminal can recognize the uplink map information accommodated in the downlink communication slot and recognize the assignment of the uplink communication slot. Therefore, the uplink processing delay can be shortened by the above-described processing on the base station side without adding any special improvement to the terminal.

  Further, the present invention is applied to a selected terminal among a plurality of terminals or a selected connection among connections set between a base station and a terminal, and an uplink processing delay is applied. Limit to terminals or connections that need to be shortened. Thereby, the downlink map information for assigning the uplink map information to the downlink communication slot can be minimized.

FIG. 1 shows a frame configuration in an embodiment of the present invention.
The frame configuration of the present embodiment is based on the WiMAX frame configuration shown in FIG. 5, and includes a downlink subframe 11, an uplink subframe 12, a preamble signal 13, a frame control header (FCH) 14, a DL-MAP 15, and a UL. -MAP 16 and downlink burst 17 are the same as in the description of FIG. 5. For example, DL-MAP IE 15a and DL-MAP IE 15b corresponding to the map information of each connection are arranged in DL-MAP 15.

  The feature of this embodiment is that the uplink map information of the next frame is not allocated by the UL-MAP 16, but the MAP information is encapsulated and accommodated in the downlink bursts 17a and 17b in the downlink burst 17. The link bursts 17a and 17b are allocated by the DL-MAP IEs 15a and 15b of the DL-MAP 15.

  The uplink MAP information accommodated in the downlink bursts 17a and 17b indicates the uplink burst of the next frame as shown in FIG. That is, the DL-MAP 15-1 of the nth frame assigns the downlink burst 17a-1 in the same frame, and the uplink map information encapsulated in the downlink burst 17a-1 is n + 1) The uplink burst 12-2 in the frame is allocated. Conventionally, as shown in FIG. 6, the UL-MAP 16-1 in the nth frame assigns the uplink burst 12-2 in the (n + 1) th frame, whereas in this embodiment, the uplink is uplinked. Map information from the UL-MAP 16-1 retreats to the downlink burst 17a-1, and the time difference has the effect described below.

  The arrangement of the downlink bursts (FIG. 1: 17a, 17b, FIG. 2: 17a-1,...) Encapsulating the uplink map information is stored in the downlink subframe 11 at the end of the burst (last bit position). The time difference between the DL-MAP 15 and the UL-MAP 16 is set to be a predetermined time. For example, even if the slot is at the end of the downlink subframe 11 as in the downlink burst 17b of FIG. 1 or is a slot that is long in the time axis direction as in the downlink burst 17a, the end thereof is predetermined from the UL-MAP 16. It only needs to be delayed by time. The timing at the end may be managed in absolute time, and for example, the end may be set to be a predetermined section in the frame (for example, between 2.5 and 3 msec from the head of the frame).

  As described above, the terminal recognizes the uplink map information based on the time difference between the UL-MAP 16 and the downlink bursts 17a and 17b that encapsulate and accommodate the uplink map information, and prepares for uplink transmission (FIG. 8). : The time at which S124) is started is later than before. In other words, conventionally, uplink transmission preparation is started at the reception timing of the UL-MAP 16, data stored in the transmission buffer at that time is targeted, and processing waits until the transmission timing of the next frame (FIG. 8: S129). ) On the other hand, in this embodiment, preparation for uplink transmission is started from the end timing of the downlink bursts 17a and 17b, so that the processing waiting time is shortened until the transmission timing of the next frame, and reception of the downlink bursts 17a and 17b is performed. Data stored in the transmission buffer at the time becomes the transmission target. That is, conventionally, data after the reception timing of the UL-MAP 16 is transmitted in the next frame, whereas in the present embodiment, a transmission buffer is provided between the UL-MAP 16 and the downlink bursts 17a and 17b. The data stored in can be transmitted in the next frame, and the processing delay (standby time) of the data is shortened.

FIG. 3 shows the bandwidth allocation processing procedure of the embodiment of the present invention in the base station.
In the figure, when the base station starts the bandwidth allocation (scheduling) process (S1), the base station searches for a connection with a transmission request or transmission reservation from the terminal side under a predetermined priority rule (S2). It is determined whether or not there is a connection (S3). Then, if there is a connection to be allocated, the required bandwidth is calculated (S4), time and frequency resources (slots) corresponding to the calculated bandwidth are allocated (S5), and a connection requiring low delay for the connection is calculated. It is determined whether or not there is (S6). Then, if it is a low-latency connection, an uncompressed standard UL-MAP for encapsulating and accommodating in a downlink burst (FIG. 1: 17a, etc.) is created (S7), and this standard UL-MAP is further encapsulated. A compressed DL-MAP is created to allocate the downlink burst accommodated in step S8. Next, the remaining bandwidth of the uplink frame is determined (S10). If there is a remaining bandwidth in the uplink frame, the process returns to step S2, and the processing up to step S8 is repeated.

  If it is determined in step S6 that the connection is not a low-latency connection, a compressed UL-MAP is created as in the conventional case (S9), and the remaining bandwidth of the uplink frame is determined (S10). If there is a remaining bandwidth, the process returns to step S2, and the processing up to step S9 is repeated. The processing so far is executed by the uplink map information processing means of the base station.

  If the allocation for the connection to be allocated is completed by the above processing and it is determined in step S3 that there is no connection to be allocated, or if it is determined in step S10 that there is no remaining uplink bandwidth, the corresponding frame The bandwidth remaining in the downlink frame, that is, the remaining bandwidth excluding the bandwidth such as FCH and compressed UL-MAP is calculated (S11), and the bandwidth allocation of the downlink frame is performed in the remaining bandwidth (S12), and the compression is performed. DL-MAP is created (S13), the bandwidth allocation process is terminated, and the process waits for the bandwidth allocation process of the next frame (S14).

  Note that the compressed DL-MAP in step S8 and the compressed DL-MAP in step S13 are merged and accommodated in the DL-MAP (FIG. 1:15).

  Further, in step S6, the uplink map information processing means determines whether or not the connection is a low-latency connection. However, the uplink map information processing means may perform processing in which all connections are regarded as low-delay. In this case, the UL-MAP (FIG. 1:16) is not created in step S9, and the processing in steps S7 and S8 can be performed for all connections to shorten the uplink processing delay.

  Further, in step S6, the uplink map information processing means may determine whether or not the terminal is a terminal for low delay without managing the required delay quality for each connection. In this case, the processing of steps S7 and S8 can be performed only for the terminal selected as the low-delay terminal, and the uplink processing delay can be shortened.

  FIG. 4 shows a part of the downlink burst reception processing procedure of the embodiment of the present invention at the terminal. Here, the process of step S148 shown in FIG. 9 is extracted and shown.

  The downlink burst reception processing procedure at the terminal is basically the same as that shown in FIG. 9, but when the downlink burst is determined to be control information at step S147 in FIG. It is determined whether it is UL-MAP (S148-1). And if a downlink burst is UL-MAP, it will transfer to the process (S121) at the time of UL-MAP reception of FIG. 8 (S148-2). On the other hand, if it is not UL-MAP, normal control information processing is performed (S148-3), and the processing ends and waits until processing of the next frame (S150). As described above, when the terminal performs step S148-1 with respect to step S148 of the downlink burst reception processing procedure and detects the UL-MAP encapsulated in the downlink burst, the conventional UL-MAP is detected. The process proceeds to reception processing (S121).

  In this embodiment, the application to a wireless system compliant with the WiMAX standard of TDD in which uplink and downlink are serviced by the same frequency channel has been described as an example. However, FDD with different frequency channels for uplink and downlink is used. Even in the case of a (Frequency Division Multiplexing) wireless system, the present invention can be similarly applied as long as the wireless system is managed at a predetermined frame period. Furthermore, although the present embodiment is premised on a wireless system, it is a wired system that performs uplink and downlink bandwidth allocation in accordance with an instruction from a base station or a control station in a wired system, and is managed at a predetermined frame period. The present invention can be similarly applied to any wired system.

The figure which shows the flame | frame structure in embodiment of this invention. The time chart which shows the outline | summary of allocation of the uplink burst in embodiment of this invention. The flowchart which shows the band allocation processing procedure of embodiment of this invention in a base station. The flowchart which shows a part of reception process procedure of the downlink burst of embodiment of this invention in a terminal. The figure which shows the flame | frame structure in WiMAX. The time chart which shows the outline | summary of allocation of the uplink burst by UL-MAP in WiMAX. The flowchart which shows the conventional band allocation processing procedure in a base station. The flowchart which shows an example of the transmission processing procedure of the conventional uplink burst in a terminal. The flowchart which shows an example of the reception process procedure of the conventional downlink burst in a terminal.

Explanation of symbols

11 Downlink subframe 12 Uplink subframe 13 Preamble signal 14 Frame control header (FCH)
15 DL-MAP
16 UL-MAP
17 Downlink burst

Claims (13)

A base station and a plurality of terminals are connected via a communication line, and are divided into a downlink area used for downlink communication from the base station to the terminal and an uplink area used for uplink communication from the terminal to the base station. Compose the frame,
The base station allocates a communication slot used for transmission of the downlink and a communication slot used for reception of the uplink, and transmits to the terminal as downlink map information and uplink map information, respectively.
In the communication system in which the terminal receives the downlink map information and the uplink map information and performs downlink reception and uplink transmission using a communication slot indicated by each map information.
The base station encapsulates and accommodates uplink map information assigned to a connection set up with the terminal in a downlink communication slot assigned by the downlink map information ,
An end time position of a downlink communication slot that encapsulates and accommodates the uplink map information is arranged at a time position delayed by a predetermined time from a time position at which the downlink map information is arranged. Communication slot allocation method for a communication system. The communication slot allocation method according to claim 1, for a selected terminal of the plurality of terminals or for a selected connection among connections set between the base station and the terminal. A communication slot allocation method for a communication system, characterized in that In the communication slot allocation method of the communication system according to claim 1,
The downlink map information and the uplink map information use band allocation control information composed of one or more combinations of frequency information, time information, and code information,
The downlink map information uses compressed map information obtained by compressing header information of many downlink map information, and the uplink map information encapsulated and accommodated in the downlink communication slot compresses header information. A communication slot allocation method for a communication system, characterized by using non-standard map information. In the communication slot allocation method of the communication system according to claim 3 ,
A communication slot allocation method for a communication system, wherein the compressed map information is in a compressed DL-MAP format, and the standard map information is in a standard UL-MAP format. A base station and a plurality of terminals are connected via a communication line, and are divided into a downlink area used for downlink communication from the base station to the terminal and an uplink area used for uplink communication from the terminal to the base station. Compose the frame,
The base station is configured to allocate a communication slot used for transmission of the downlink and a communication slot used for reception of the uplink, and transmit to the terminal as downlink map information and uplink map information, respectively.
In the communication system that is configured to receive the downlink map information and the uplink map information, and to perform downlink reception and uplink transmission using a communication slot indicated by each map information,
The base station encapsulates and stores uplink map information assigned to a connection set up with the terminal in a downlink communication slot assigned by the downlink map information. With means ,
The uplink map information processing means is a time in which an end time position of a downlink communication slot that encapsulates and accommodates the uplink map information is delayed by a predetermined time from a time position where the downlink map information is arranged. A communication system characterized by being arranged at a position . The communication system according to claim 5 , wherein
The uplink map information processing means is applied to a selected terminal among the plurality of terminals or a selected connection among connections set between the base station and the terminal. A communication system characterized by being provided. The communication system according to claim 5 , wherein
The uplink map information processing means uses, as the downlink map information and the uplink map information, band allocation control information composed of one or more combinations of frequency information, time information, and code information, and the downlink map information. Information is compressed map information obtained by compressing header information of a number of downlink map information, and the uplink map information encapsulated and accommodated in the downlink communication slot does not compress header information. A communication system characterized by having a configuration using the above. The communication system according to claim 7 ,
The communication system characterized in that the compressed map information is in a compressed DL-MAP format, and the standard map information is in a standard UL-MAP format. A base station and a plurality of terminals are connected via a communication line, and are divided into a downlink area used for downlink communication from the base station to the terminal and an uplink area used for uplink communication from the terminal to the base station. Compose the frame,
The base station is configured to allocate a communication slot used for transmission of the downlink and a communication slot used for reception of the uplink, and transmit to the terminal as downlink map information and uplink map information, respectively.
In the communication system that is configured to receive the downlink map information and the uplink map information, and to perform downlink reception and uplink transmission using a communication slot indicated by each map information,
Uplink map information processing means for encapsulating and storing uplink map information assigned to a connection set between the terminal and a downlink communication slot assigned by the downlink map information ;
The uplink map information processing means is a time in which an end time position of a downlink communication slot that encapsulates and accommodates the uplink map information is delayed by a predetermined time from a time position where the downlink map information is arranged. A base station characterized by being arranged at a position . In the base station according to claim 9 ,
The uplink map information processing means is applied to a selected terminal among the plurality of terminals or a selected connection among connections set between the base station and the terminal. A base station characterized by being. In the base station according to claim 9 ,
The uplink map information processing means uses, as the downlink map information and the uplink map information, band allocation control information composed of one or more combinations of frequency information, time information, and code information, and the downlink map information. Information is compressed map information obtained by compressing header information of a number of downlink map information, and the uplink map information encapsulated and accommodated in the downlink communication slot does not compress header information. A base station characterized by being configured to use. The base station according to claim 11 ,
The base station characterized in that the compressed map information is in a compressed DL-MAP format, and the standard map information is in a standard UL-MAP format. In a terminal connected to the base station according to claim 9 ,
When the downlink communication slot assigned by the downlink map information is received and the encapsulated uplink map information is detected, the uplink communication slot assigned by the uplink map information is used. A terminal comprising means for transmitting data.

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