KR20010012697A - Method for data transmission on a common medium - Google Patents

Abstract

The present invention relates to a method for transmitting data on a common medium between a center 133 and a plurality of subscribers (130, 131, 132), the method of receiving data packets of the center 133 subscribers (130, 131) 132, or by transmitting (uplink) data packets of subscribers 130, 131, and 132 to the center 133. User signal data phases 3, 4; 41, 42, 44, 46; 51, 52, 54, 56, 58, as well as downlink and uplink signaling data phases 2, 5; 30, 31; 40, 43, 45, 50, 53, 55, 57 are provided in a signaling period 1 having a variable length. The signaling data is used to organize uplink data transmissions 10 and downlink 9 data transmissions by sending transmission requests and assigning transmission times and other optional information. Signaling data for the next data phases 42-46; 52-58 are included in the downlink signaling data phase 9. The next data phases described above start only after the intermediate data phases 41 and 51, whereby the intermediate data phases are organized into initial downlink signaling data phases, and the signaling data phases 30, 31, 5; 40, 43, 45 50, 53, 55, 57 are variably positioned within a signaling period, and are determined through one or more preceding downlink signaling data phases, and the user signal data phases 44, 56 are uplink signaling data phases; 43 and 55 and downlink data phases 45 and 57, thereby improving intermediate data phases with increased variability and dynamics.

Description

Method for data transmission on a common medium

Such methods are described, for example, at the IEEE Wireless Communication System Symposium. It is known from D. Petras's Conference Report, pp. 79-84 (1995). Here, the data packet delivered in the asynchronous transmission mode (ATM) is transmitted as a protocol, through which dynamic time division for data transmission is determined (dynamic slot assignment: DSA). According to this protocol, transmissions in the downlink signaling period are organized through the preceding downlink signaling phase, where the signaling period is interrupted through the user signal phase, which is organized through the preceding downlink signaling phase.

Known protocols suitable for control of data transmission through the center are provided such that the signaling data phase is transmitted within the signaling period at a determined time position. Although the known methods are set up to achieve high process dynamics, the prior art is difficult to ensure the improvement of process dynamics and high flexibility in the kind of methods mentioned at the outset.

The present invention relates to a data transmission method for transmitting data on a common medium between a center and a plurality of subscribers, the method transmitting (downlink) data packets from the center to the subscribers, Controlled by transmitting (uplink) data packets from the subscriber to the center, where downlink and uplink signaling data phases as well as user signal data phases are of variable length is provided for signaling periods having a variable length, whereby the signaling data is used to organize uplink data transmissions and downlink data transmissions by sending transmission requests and allocating transmission times and other optional information. The signaling data for the next data phase is included in the downlink signaling data phase. , The above-described first and then the data phase will begin only after the intermediate data phase, and wherein the intermediate phase data is organized in the initial downlink signaling data phase.

1 is a schematic illustration of a communication network capable of performing data transmission in accordance with the present invention;

2 is a diagram illustrating a signaling period in a conventional data transmission method of a time dual operation method.

3 shows a first embodiment of data transmission according to the invention;

4 shows a second embodiment of data transmission according to the invention;

FIG. 5 shows the preferred splitting of uplink and downlink transmissions in the embodiment according to FIG. 4. FIG.

6 shows another division between uplink and downlink transmissions in the embodiment according to FIG. 4;

7 shows another variant of uplink and downlink transmission in the embodiment according to FIG. 4;

8 shows a third embodiment of data transmission according to the invention;

9 shows schematically a preferred division of uplink and downlink transmissions in the embodiment according to FIG.

Based on this problem, the method according to the invention of the kind mentioned at the outset is characterized in that the signaling data phase is variably positioned within the signaling period and at least one preceding downlink signaling data phase is determined and the uplink signaling data phase is determined. And a user signal data phase is inserted between the downlink signaling data phases.

The method according to the invention enables high variability and dynamics for different operating states of communication. In particular, it can be realized through the variable arrangement of the downlink signaling data phase and also through the variable arrangement of the signaling data phase in a short period of time in a new situation, transmission amount, and the like. In addition, a user signal data phase is provided to be inserted in accordance with the present invention between the uplink signaling data phase and the downlink signaling data phase for improved dynamics in the short term adaptation of the system to new situations. By considering the low cost process time for capacity requests through the uplink signaling data phase, the method according to the present invention may prepare for the uplink signaling data phase in the next downlink signaling data phase. For the quickest possible response, the embedded user signal data phase for high dynamics is preferably as short as possible, but the process of uplink signaling data phase for downlink signaling data is preferably transmitted as long as necessary.

As provided in accordance with the present invention, based on the variable position of the signaling data phase within the signaling period, in particular the downlink signaling data phase may be divided within the signaling period over different times.

Through variable division of the signaling period according to the present invention, mainly through variable division of the downlink signaling data phase, the data transmission length in the uplink or downlink may be determined as needed during the user signal data phase. Thus, for example, harmonization for an asymmetric communication phase may be implemented, in which the communication phase may be delivered substantially on the uplink or substantially on the downlink for a predetermined time.

In particular, for asymmetric requests, the signaling period may be meaningful when it has an uplink signaling data phase and more downlink signaling periods. In this way, organization over time can be performed beyond the amount of user signal transmission, with the requirement for uplink signaling being relatively low. To this end, the split use delivered to individual subscribers by "Video On Demand" is exemplified.

According to the present invention, signaling data in an appropriate time division may be transmitted, but may also be transmitted with user data (in a piggyback method).

The method according to the invention is useful in the transmission of ATM data signals used in wireless communication. However, it is preferably also used in a manual selection network (PON).

The present invention will be described in detail below according to the embodiment shown in the drawings.

1 schematically illustrates a broadband-band network capable of transmitting ATM-cells as data signals. The transport network consists of three network junctions (134), which are connected to the network line (136). The network relay line 134 is coupled to the contact 137 of the fixed unit 133 via one network connection line 135.

Also shown are three mobile subscribers 130, 131, 132. Usually, the stationary unit 133 performs transmission and reception with the mobile units 130, 131, and 132, thereby acting as a center. At this time, the signal (downlink) transmitted from the fixed unit 133 to the subscribers 130, 131, and 132 is by the network relay line 134. To this end, a transport protocol is provided to identify the data transmitter and the data receiver, for example in the head field of the signal packet (ATM-cell).

In the use of the method according to the invention, the fixing unit 133 is not limited only to the center role. The method selects one of the mobile subscribers 130, 131, 132 so that the selected subscriber may perform the control of the center, where the network signal data may be transmitted directly between the subscribers.

2 shows a conventional data transmission procedure in which the signaling period 1 is in contact with each other. The signaling periods each consist of one downlink period 9 and one uplink period 10.

In the downlink period 9, one downlink signaling data phase is first transmitted, which includes an announcement signal 6 for successive user data time divisions 3 in this downlink period 9. In addition, user data time divisions 4 are assigned 7, and signaling data partitioning 5 is made to subscribers 130, 131, 132 for uplink operation 10. Another received signal 8 for the signal from the user data time division 4 and the signaling data time division 5 received within a predetermined uplink period 10 is transmitted.

In the embodiment of FIG. 3, a departure from the conventional format, for example, in the downlink period 9, the downlink signaling data phases 30, 31 are transmitted in divided form, and within the downlink period 9 Can be sent to different locations. The position can be set freely. In this embodiment, allocations for uplink user data time division 4 and uplink signaling data time division 5 are transmitted in the first downlink signaling data phase 30. Through the second downlink signaling data phase 31, an announcement signal 6 for the next downlink period 9 and a receipt signal 8 for the preceding uplink period 10 are created.

Based on the time difference between the uplink signaling data phase 5 and the second downlink signaling data phase 31, all information from the preceding uplink signaling data phase 5, ie the communication and transmission request, is processed. It is considered for the next assignment.

4 to 7 illustrate the data phases 40 to 46, and the variable division of the signaling period 1 will be described.

To the signaling data phase 40 in the downlink, a user signal data phase 41 is connected, but this user signal data phase is not controlled by the signaling data phase 40, but rather determined through a preceding downlink signaling data phase. do. At the point of contact of the user signal data phase 41, the signaling period 1 is performed before the new downlink signaling data phase 45 in accordance with the functionality of the downlink signaling data phase 40 is generated. ), Uplink signaling data phase 43 and other user signal data phase 44 begin to be connected. The user signal data phase 46 connecting the signaling period 1 depends on the function of the user signal data phase 41.

In the downlink signaling data phase 40, a transfer time / delivery type for the mobile subscribers 130, 131, and 132 is assigned (7), for data or other management information received in the preceding uplink (10). Receipt is sent. By this, the position and length of the data phases 42 to 46 are determined. In the uplink signaling data phase 43, the mobile subscribers 130, 131, 132 deliver management data to the center 133. To this end, for example, a capacity request is issued for uplinks, records, communication requests and delivery requests. The next user signal data phase 44 is substantially used for the processing of the uplink signaling data of the center 133 to be connected, whereby the uplink signaling data transmitted to the uplink signaling data phase 43 is also May be considered for the next downlink signaling data phase 45.

Although new downlink signaling data is transmitted in downlink signaling data phase 45 hereinafter, user signal data transmission in user signal data phase 46 is performed based on control from downlink signaling data phase 40. As a result, the downlink signaling data transmitted from the downlink signaling data phase 45 to the center 133 and the subscribers 130, 131, and 132 may be processed without being affected by data transmission traffic.

5 allows the assignment of user signal data phases 41, 42, 44, 46 for downlink operation 9 as well as uplink operation 10, and also within user signal data phase 41. One embodiment that may be shown is shown.

According to FIG. 5, the downlink phase 9 extends from the beginning of the downlink signaling data phase 40 to the beginning of the user signal data phase 42 through the entire user signal data phase 41. The next uplink period 10 extends over the remainder of the user signal data phase 42, the uplink signaling data phase 43, and the portion of the user signal data phase 44. In addition, for the downlink operation, the remainder of the user signal data phase 44 and the data phases 45, 46 are provided.

6 shows a completely different allocation of the signal data phases 40 to 46, where downlink operation 9 is performed with all user signal data phases 41, 42, 44, 46 and uplink operation 10. While the uplink signaling data phase 43 for spontaneously is used, it is limited to only the downlink signaling data phases 40, 45.

FIG. 7 illustrates the opposite embodiment in which only uplink signaling data phase 43 is operated in uplink operation 10, and only other data phases 40 to 42, 44 to 46 are operated in downlink operation 9. Illustrated.

Here, it is clear that the method according to the invention can meet the fully asymmetric data transmission state in a very good way, in which the user signal data of the method is actually transmitted only in the downlink 9 and uplink 10.

FIG. 8 shows an embodiment for the assignment of a signaling period similar to the embodiment according to FIG. 3. Also shown is a downlink signaling data phase 50 that is coupled with the user signal data phase 51 determined by the initial downlink signaling data. Thus, the signaling period 1, which is partially controlled by the downlink signaling data phase 50 and begins with the user signal data phase 52, is connected. A second downlink signaling data phase 53 is connected thereto, which controls the next data signal phases 55, 56, 57, 58, 50. As a result, the first downlink signaling data phase 50 determines only the signal data phases 52, 53, 54. A user signal data phase 56 is inserted between the uplink signaling data phase 55 and the other downlink signaling data phase 57, which user signal data phase is downlink signaling in the downlink signaling data phase 57. To set up the data, it is possible to process the uplink signaling data from the uplink signaling data phase 55. In addition, the downlink signaling data phase 57 is functionally equivalent to the first downlink signaling data phase 50 and the next user signal data phase 58 of the user signal data phase 51 described above.

In FIG. 9, again, the assignment of signal data phases 50 to 58 for the downlink operation 9 and the uplink operation 10 with respect to the user signal data phases 51, 52, 54, 56, 58 is arbitrary. It is also clearly seen that it may change during the user signal data phases 54, 56. Only the downlink operation 9 must be substantially adjusted for the downlink signaling data phases 50, 53, 57 and the uplink operation 10 must be reliably adjusted for the uplink signaling data phase 55.

9, it can be seen mainly that the signaling period 1 is integrated into two signaling periods 1 according to FIG. 7, where the uplink signaling data phase is omitted and the two user signal data phases are integrated. . Under the reduction of the uplink signaling data phase, this integration utilizes a matching asymmetric control amount, depending on the requirements in the assignment of video on demand, for example.

The method according to the invention is also particularly suitable for a time dual operation scheme, as also shown in the examples, in which "send" and "receive" are carried out intricately intertwined over a time determined phase. However, it can also be set up in a frequency dual operation based on the method according to the invention, where "transmit" and "receive" are performed at different frequencies.

In such an embodiment, it can be seen that the signaling period 1, which may have a variable length, can be determined more precisely. The signaling period 1 includes in each case downlink signaling and uplink signaling, where the uplink signaling phase can be included in the reverse order in more downlink signaling phases. As such, the assignment of the user signal phases 41, 42 or 51, 52 shown in FIGS. 7, 8, 9 can be modified, so that, for example, the user data phases 42, 52 are also very short or omitted. It can be obvious.

Claims (10)

Data is transmitted on a common medium between the center 133 and the plurality of subscribers 130, 131, and 132, and the control at this time sends the data packet of the center 133 to the subscribers 130, 131, and 132. By transmitting (downlink) or transmitting (uplinking) data packets of subscribers 130, 131, and 132 to the center 133, and the user signal data phases 3, 4 during the signaling period 1 having a variable length. 41, 42, 44, 46; 51, 52, 54, 56, 58, as well as downlink and uplink signaling data phases (2, 5; 30, 31; 40, 43, 45; 50, 53, 55, 57) are provided, the signaling data is used to organize the uplink data transmission 10 and downlink 9 data transmission by sending a transmission request and assigning a transmission time and other optional information, the next data phase Signaling data for (42-46; 52-58) is included in the downlink signaling data phase 9 , The following data phase, data phase are medium (41; 51) starts only after, and thus the data transfer method which is organized in the initial downlink signaling data phase is medium in the data phase, The signaling data phases 30, 31, 5; 40, 43, 45; 50, 53, 55, 57 are variably positioned within the signaling period and are determined through one or more preceding downlink signaling data phases, The user signal data phase (44, 56) is operated between an uplink signaling data phase (43, 55) and a downlink data phase (45, 57). The method of claim 1, wherein the intermediate data phase (41, 51) is configured through a user signal data phase. The method according to claim 1 or 2, wherein the user data phases 44 and 56 are formed as short as possible, so that processing of uplink signaling data within the user data phase is interrupted to form downlink signaling data. A data transmission method characterized by the above. 4. The method according to any one of claims 1 to 3, wherein during the user signal data phases 41, 42, 44, 46; 51, 54, 56, 58, uplink 10 or downlink 9 The data transmission period of the data transmission method characterized in that it is determined as necessary. 5. An uplink signaling data phase (55) and more downlink signaling data phases (53, 57) are provided during any one of the preceding claims. Data transmission method. The data transmission method according to any one of claims 1 to 5, wherein the signaling data is given a unique time interval. The data transmission method according to any one of claims 1 to 5, wherein the signaling data is transmitted together with user signal data. 8. Method according to any of the preceding claims, characterized in that the downlink (9) and uplink (10) data transmissions are carried out in a time-duplex-drive manner. 9. A data transmission method according to any one of claims 1 to 8, wherein the transmission of the ATM-data signal is by wireless communication. 9. A method according to any one of the preceding claims, wherein said data transmission is formed in a passive optional network.