RU2216100C2 - Method for planning readings of variable blocks with aid of status flag of ascending communication line in burst data transmission system - Google Patents

Abstract

FIELD: radio communication systems; dynamic allocation of transmission resources. SUBSTANCE: system uses status flag of ascending communication line transferred over descending line and is alternating with data for planning traffic over ascending communication line for one or more mobile users of same physical channel. Flag reading changes and is determined in signaling control system when establishing burst transmission. Flag informs mobile station that one or more sequential radio blocks are reserved for transmission over ascending communication line. Mobile station should not receive flag during remaining period determined by number of planned radio blocks. EFFECT: enhanced data transmission speed, flexibility, and efficiency of frequency band use through radio interface. 15 cl, 7 dwg

Description

State of the art
The invention relates generally to packet data transmission systems, and more particularly, to a method and apparatus for dynamically allocating a transmission resource.

 The rapid growth of commercial communication systems and, in particular, cellular radiotelephone systems is forcing system designers to look for ways to increase system capacity without compromising the quality of communication beyond acceptable limits for subscribers. At the same time, the use of mobile equipment for data transfer instead of speech is becoming extremely popular among users. The ability to send and receive e-mail and use a Web browser to access the World Wide Web is often discussed as services that will be increasingly used in wireless communication systems. In response to this, communication system developers are looking for ways to efficiently transfer data information to and from mobile users.

 The requirements for data transmission and, for example, for voice transmission have significant differences. For example, the delay requirements are higher for speech, which is a real-time service, and the error requirements are higher for data transmission, while the delay limits become lower. Using packet data protocols, which are more suitable for data transfer than channel switching protocols, is starting to find its own way in cellular communication systems. Currently, the integration of packet services in GSM cellular systems (global mobile communication system), as well as in DAMPS cellular systems (digital advanced mobile telephone service) is being standardized.

 Currently, GSM systems provide a circuit-switched data service that can be used for interconnection with external data networks. A circuit-switched data service is used for circuit switching as well as packet-switched data transmission. In order to make packet-switched data transmission more efficient, a new packet-switched data service is being introduced as part of GSM, which is called OOPR (General Packet Radio Service). OOPR will allow for packet-switched transmission, such as IP (Internet Protocol (IP)) or virtual circuit-switched transmission. OOPR will support connectionless transfer protocols (e.g. IP), as well as connection oriented (X.25) protocols. One of the advantages of a packet-switched data transfer protocol is that a number of users can share a single transmission resource. Thus, in the case of, for example, a GSM cellular system, a time interval on a radio frequency carrier can be used by several mobile users to receive and transmit data. The shared transmission resource is controlled by the cellular system network for transmissions on both downlink and uplink.

 OOPR is a GSM service and therefore parts of the GSM infrastructure will be involved. These parts of the GSM communications system are described in ETS 300 574 of the European Telecommunications Standards Institute (ETSI).

 An advantage of introducing a packet data protocol into cellular systems is the ability to maintain a high data rate and at the same time achieve flexibility and efficient use of the radio frequency band through the radio interface. The concept of RBM is designed for the so-called "multi-interval operations", in which one user can simultaneously occupy more than one transmission resource.

 Figure 1 shows the structure of the network OOP. The OOPR network enters information packets from external networks 122, 124 to the SHOW (gateway service node of OSS) 120. The packet is then routed from the SHOU through the backbone network 118 to the control system (UPRS support node) 116, which serves the zone in which the addressed mobile user OOPR. From the control system, the packets are routed to the correct SBS (base station system), which is in the state of dedicated OSS transmission. Register 115 OAPR will support all the data subscriber OPR. The SSR register may or may not be integrated with the ROME (home location register) 114 of the GSM system. Subscriber data can be exchanged between the control system and the mobile switching center (MSC) to provide service interaction, for example, such as limited roaming.

 In FIG. 2 illustrates a packet conversion stream for an SLR system. This is briefly described in the work of D. Turin and others, "Proposal for working at the level of multi-interval UDS for the packet data channel in GSM", ICUPC, 1996, v. 2, p. 572-576 (D. Turina et al., "A Proposal for Multi-Slot MAC Layer Operation for Packet Data in GSM"), which is incorporated herein by reference.

 Packets that arrive from the network 210 are converted into one or more logical link control (LLS) frames containing an information field, a frame header (SC), and a frame check sequence (ACL). The LULS frame is converted into a plurality of data blocks of the radio link (LRS 214 data blocks, each of which includes a block header (ST)), an information field and a sequence for block checking (PPB), which can be used in the receiver to check errors in the information field . A unit, as is known to those skilled in the art, is the smallest part of a packet that can be relayed through a radio interface. LRS blocks are additionally converted to radio blocks of the physical layer. In the OAPR system, one radio block is converted into four normal packets, which are sent sequentially over one physical GSM channel.

 The block header includes an uplink status flag (FSWL) field to support a dynamic uplink medium access method. FSWLS is used in the packet data channel to enable the multiplexing of radio blocks from a number of mobile users, that is, the dynamic allocation of shared transmission resources in the uplink. The FSWL contains 3 information bits that allow you to encode eight different FSWLS states used to multiplex the uplink graph. FSWLS is included at the beginning of each radio block that is transmitted in a downlink, that is, alternates with a downlink graph for a specific mobile user. Since the FSWLS is transmitted in each radio block in the downlink, all mobile stations that use the dynamic allocation method and share a certain transmission resource should therefore always listen to the downlink communication channel to determine whether the FSWLS shows free uplink transmission for any mobile station. If a mobile user is detected by the FSWL, uplink transmission is permitted in the next uplink radio block. This method is depicted in figure 3, in which FSWL = R1 shows that the mobile station 1 (MS) can use the following four packets for transmission in the uplink. In the case of multi-interval assignment, when the mobile station assigns more than one time slot in each TDMA frame (time division multiple access), more than one LRS unit can be transmitted during four TDMA frames, however, each one LRS block always alternates through four packets in one physical channel, i.e. a time interval. Then, in accordance with FIG. 3, it is shown that if FSWLD = R2, then mobile station 2 (MS2) can use the following four packets for uplink transmission. A value of "F" denotes a random packet access channel (FAC), which is used by mobile users to initiate uplink transmissions.

 The disadvantage of the above protocol becomes apparent when considering the use of adaptive antenna arrays, which increase the throughput of the cellular system and the efficiency of the use of limited radio resources. The implementation of antenna arrays can provide more efficient transmission and reception of radio signals, since the transmitted energy can be directed towards a specific receiver in the side lobes of the antenna radiation. This allows you to significantly limit the overall level of interference in cellular systems and reduce and limit the transmitted output power in certain directions, for example, from the transmitter of the base station.

 This is of great importance for increasing the capacity of promising cellular systems that will use such adaptive antennas effectively. However, there are limitations on the gain characteristics that arise when implementing adaptive antennas if, for example, a downlink graph directed towards a specific mobile user alternates in the same packets that the downlink signaling control system intended for other users . One example is the aforementioned FSWL flag, which is included in downlink transmissions for a specific user. Different mobile stations can have different geographical locations and therefore it is impossible to concentrate the energy of the transmitted signal in only one or several directions. Similarly, it is difficult to obtain an effective power control algorithm for transmissions directed to more than one mobile user.

 Another disadvantage of the described protocol is the impossibility of introducing new modulation for certain downlink radio blocks. Namely, the latest development in the GSM standard offers the use of a new modulation of a higher level for users who have good radio conditions, which allow users to increase the data transfer speed and overall system throughput. An advantage is the ability to freely multiplex radio blocks using existing or new downlink modulation, thereby obtaining trunk gain. This protocol excludes situations in which one mobile station of the OOF monitors the FSWL, which should enter the radio block using the existing modulation.

 To eliminate this drawback allows the method of fixed access to a distributed medium for the transmission of information, in which the alarm system with the initial installation will accurately determine when users transmit on the uplink. In addition, the method has the advantages associated with dynamic multiplexing in the uplink, for example, due to the increased flexibility in the allocation of transmission resources.

SUMMARY OF THE INVENTION
An object of the present invention is to increase efficiency in a packet data transmission system using a dynamic resource allocation method by introducing additional flexibility in multiplexing uplink transmission resources. Using the downlink FSWL to show that the mobile station plans to transmit an arbitrary number of consecutive radio blocks over the physical channel, the mobile station should not listen to the FSWL during a series of the following downlink blocks, a series based on the indication given in the message about the channel assignment of this particular mobile station.

 What FSWLS reception is indicated for a mobile station using uplink assignment is precisely determined in the original signaling system when assigning a transmission resource, that is, a physical channel. In a TDMA system, the physical channel may be a time interval. In multi-interval systems, several time intervals can be distinguished, but different FSWLS values will be assigned for each allocated time interval, which may or may not show the same number of consecutive radio block transmissions in the uplink. In addition, one FSWL appearance can show a different number of uplink radio block transmissions for different users depending on the assignments of individual channels. By planning to transmit an arbitrary number of consecutive radio blocks for uplink transmission on a physical channel, there is no need for the mobile user to listen to the FSWL during this transmission before the last radio block on the uplink is scheduled. As a result, downlink transmission can be performed more efficiently and generally reduce interference, for example, by means of adaptive antennas and power control algorithms.

Brief Description of the Drawings
The above objectives and features of the present invention will become more apparent from the following description of preferred embodiments with reference to the accompanying drawings, in which:
figure 1 depicts the structure of OAP;
FIG. 2 shows a packet transmission stream and information conversion in an exemplary packet data transmission system;
FIG. 3 depicts an FSWL flag showing uplink transmission multiplexing;
FIG. 4 depicts uplink transmission multiplexing performed by an FSWL showing transmission of an uplink radio block;
FIG. 5 shows uplink transmission multiplexing performed by an FSWL showing transmission of more than one uplink radio block, and
6 depicts an exemplary graph situation in a packet data system according to the present invention.

Detailed description
The following is a description of the invention with reference to an SLR system in which a dynamic resource allocation method is implemented for multiplexing mobile users by transmitting an FSNL in a downlink. Mobile users sharing the transmission resource listen on the downlink transmission of the FSWL in order to determine when uplink transmissions are allowed.

 The dynamic uplink allocation method corresponding to known systems is based on partitioning the FSWL of one radio block, that is, one FSWL appearance in the downlink radio block determines uplink reservation for only one block. This is depicted in FIG. 4, in which each downlink radio block includes an FSWL allocating to the mobile user the next uplink block.

 The present invention recognizes that the FSWLS granularity can vary over the period of allocation of one channel from one to several consecutive blocks, which means that the appearance of the selected FSWLS is interpreted by the mobile station as the distribution of several consecutive radio blocks for transmission on the uplink. This method slightly reduces the flexibility of the dynamic allocation method, but provides an advantage for other applications.

 Since reserving multiple blocks on the uplink can start everywhere, this is an advantage for broadcasting the correct FSNLS only in the first block in the sequence, although in the remaining radio blocks the unused value for the FSNL is transmitted in order to prevent other users from transmitting on the uplink . A mobile station that has previously received an indication for the distribution of a number of consecutive radio blocks, after receiving such an unused FSVL, will ignore it for the period determined by the uplink allocation. The unused FSVL value should be available in the packet data channel for other purposes as well, for example, in order to be able to prevent transmission of MS over the uplink in certain cases, for example during certain control information transmissions.

 By distributing, for example, four consecutive radio blocks in the same time interval of the uplink over the same FSWL appearance, three other radio blocks in the downlink can be used more freely. This greatly simplifies the use of adaptive antenna arrays in which at least three of the four radio blocks in the downlink can be sent in side lobes directed towards the mobile station (PS), receiving at the current time the radio blocks of the downlink. This distribution example is shown in FIG. Figure 5 shows the FSWL in order to show that four consecutive radio blocks are distributed in the mobile station 1. The distribution is shown only in the first radio block and it is envisaged that three consecutive radio blocks are available for transmission on the uplink. Three consecutive downlink blocks following the radio block showing the distribution for mobile station 1 include an unused FSVL (Un) value, which indicates that the MSs receiving this should not transmit on the uplink. During this period of time, the downlink transmission should not reach the mobile station 1 in order to multiplex the transmission on the uplink and can instead be directed via the transmitting side lobes of the antenna array to the mobile station receiving on the downlink. Of course, this can sometimes happen in the same way, since the mobile station is scheduled for transmission in the uplink.

 It will be clear to those skilled in the art that the number of consecutive radio units depicted in FIG. 5 is selected by way of example only. Indeed, any number of consecutive uplink radio blocks can be scheduled. The value of FSWLS is determined in the original signaling system when the physical channel is allocated to the mobile user. In an alternative embodiment of the present invention, in which the FSVL value is the same for all mobile stations, for example in a specific cell, it is also possible to broadcast a number of blocks that a mobile user can transmit. You can also use the FSVLS itself to accurately determine the number of consecutive radio blocks intended for transmission. In this case, the FSWL may require additional information symbols in order to transmit the corresponding number of blocks to the mobile user.

 In FIG. 6 depicts an exemplary graph situation according to the present invention in which a physical channel is shared by three mobile stations. It should be noted that the control alarm system is omitted in the figure, since it is not necessary for a correct understanding of the invention.

 As shown in the TDMA frame diagram (FIG. 6), the mobile station 1 receives the FSWL (R1) at the designated physical carrier frequency, for example, a time slot indicating that uplink transmission is allowed for the next four consecutive radio block periods. In OAP, this corresponds to the next 16 mdvr frames. The FSWL shown to mobile station 1 is included in downlink transmissions to mobile station 3. This downlink radio block is transmitted to all mobile stations sharing the same physical channel. Mobile station 2 may also receive downlink transmission, and an FSWL, which will indicate to mobile station 2 that resources are not allocated for uplink transmission. In the next radio block, frames 8-11 TDMA, there is an uplink transmission from the mobile station 1, although the downlink transmission to the mobile station 3 continues. In this downlink radio block, it is only possible to transmit to the mobile station 3, since the mobile station 1 already knows that four consecutive blocks are distributed in the uplink. The unused FSVL (Un) value is then alternated in the downlink to prevent transmission from other mobile stations in the uplink. During the last scheduled uplink radio block, TDMA frames 19-22, the downlink transmission should again be broadcast to all users, ensuring that mobile station 2, which is shown in the FSWL (R2), as well as other users receive uplink distribution of yet another number of consecutive blocks. Then the above-described course of events takes place again.

 It should be noted that the mobile user may have additional physical channels, for example, time intervals distributed at the same or different frequencies, at which the FSWL readings are applied similarly, but not necessarily. Any number of consecutive radio blocks can be shown using FSVLS, and the number is determined based on the mobile users in the original signaling system.

 6 shows two directions of radiation from the antenna or side lobes 610 and 612. These side lobes show that the downlink transmission including the unused FSVL value can be directed towards a mobile station receiving data only in the downlink, that is, towards the mobile station 3 described in the above example. This is possible in a system that uses adaptive antenna arrays. By limiting the transmission of signal energy at certain angular intervals and possibly also controlling the power with respect to only one (or several) mobile stations, a significant reduction in the level of interference can be achieved.

 Although the invention has been described with respect to an SLR system, it will be understood by those skilled in the art that similar modifications for multiplexing uplink transmissions can also be performed in other packet data transmission systems, and similar advantages mentioned above can be achieved. Accordingly, the invention should not be construed as limited by the above-described embodiments, it is defined only by the following claims, which is intended to cover all its equivalents.

Claims (25)

 1. A method of transmitting information in a packet-switched transmission system in which uplink and downlink transmissions are segmented into radio blocks and a number of mobile stations share one transmission resource, which comprises informing the mobile station of an arbitrary number of radio blocks that can be sequentially transmitted after receiving the uplink status flag (FSWL), transmit the FSWL in downlink transmission to the mobile station in order to initiate the transmission on an uplink of an arbitrary number of radio blocks, and a series of blocks are transmitted sequentially using a mobile station when transmitting on an uplink.  2. The method according to p. 1, characterized in that at least one unused FSVLS is additionally transmitted during the sequential transmission of an arbitrary number of radio blocks, if an arbitrary number is greater than one, in order to show that uplink transmission of a transmission resource from other mobile stations.  3. The method according to p. 1, characterized in that when informing additionally broadcast the value of an arbitrary number of blocks in the mobile station.  4. The method according to p. 1, characterized in that when informing additionally accurately determine the value of an arbitrary number of blocks if the transmission resources are distributed between the mobile station and the system.  5. A method of dynamically allocating resources in a transmission system in which uplink and downlink transmissions are segmented into radio blocks and a number of mobile stations share a single transmission resource, which consists in transmitting a pointer during downlink transmission to a mobile station during the establishment of a radio connection between the mobile station and the base station, the indicator showing the number of radio units that the mobile station can transmit sequentially over the resource the transmission after receiving the flag directed to the mobile station.  6. The method according to p. 5, characterized in that the transmission system is a transmission system of radio packets.  7. The method according to p. 5, characterized in that the transmission system is a time division multiple access system (TDMA).  8. A system for transmitting information in a packet-switched transmission system in which uplink and downlink transmissions are segmented into radio blocks and a number of mobile stations share a single transmission resource comprising means for informing the mobile station of an arbitrary number of radio blocks that can to be sequentially transmitted after receiving the uplink status flag (FSWL), means for transmitting the FSWL in downlink transmission to the mobile station so that to initiate uplink transmission of an arbitrary number of radio blocks, means for sequentially transmitting, using a mobile station, the number of blocks in uplink transmission.  9. The system according to claim 8, characterized in that it further comprises means for transmitting at least one unused FLRS during sequential transmission of an arbitrary number of radio blocks, if an arbitrary number is greater than one, in order to show that uplink transmission is prevented transmission resource from other mobile stations.  10. The system of claim 8, wherein the means for informing further comprises means for broadcasting the value of an arbitrary number of blocks to mobile stations.  11. The system of claim 8, wherein the means for informing further comprises means for accurately determining the value of an arbitrary number of blocks if transmission resources are distributed between the mobile station and the system.  12. A base station for transmitting data packets, comprising an antenna array for transmitting data packets in at least one of a plurality of antenna side lobes and means for broadcasting packets including an uplink status flag (FSWL) in a first set of a plurality of side lobes , and for transmitting packets in a second set of a plurality of side lobes directed toward a particular mobile station.  13. The base station according to claim 12, wherein the FSWL identifies which mobile station can transmit, on the uplink, a predetermined sequential number of blocks.  14. A method of dynamically allocating resources in a transmission system in which uplink and downlink transmissions are segmented into radio blocks and a number of mobile stations share a single transmission resource, which consists in transmitting an uplink status flag (FSVL) during transmission on the downlink to the mobile station during the establishment of radio communication between the mobile station and the base station, and FSLS shows the number of radio units that the mobile station can transmit after ovatelno of transmission resources.  15. The method according to p. 14, characterized in that at least one unused FSWL is additionally transmitted during the transmission of the said number of radio blocks, if the number of blocks is more than one, in order to show that the transmission of the transmission resource on the uplink is not allowed.  16. The method according to p. 14, characterized in that the transmission system is a transmission system of radio packets.  17. Able p. 14, characterized in that the transmission system is a multiple access system with time division multiplexing (TDMA).  18. The method according to p. 14, characterized in that the base station contains an adaptive antenna array.  19. A system for dynamically allocating resources in a transmission system in which uplink and downlink transmissions are segmented into radio blocks containing one transmission resource that is shared by a number of mobile stations, and means for transmitting an uplink status flag (FSWL) when transmitting on a downlink to a mobile station while establishing a connection between the mobile station and the base station, the FSWL shows the number of radio units that the mobile station can Transmit sequentially on a transmission resource.  20. The system according to p. 19, characterized in that it further comprises means for transmitting at least one unused FSVL during the transmission of the aforementioned number of radio blocks, if the number of radio blocks is more than one, in order to show that the resource is prevented from being transmitted on the uplink Transmissions from other mobile stations.  21. The system of claim 19, wherein the transmission system is a radio packet transmission system.  22. The system of claim 19, wherein the transmission system is a time division multiple access (TDMA) system.  23. The system of claim 19, wherein the base station comprises an adaptive antenna array.  24. A method of transmitting data packets, which consists in broadcasting data packets containing an uplink status flag (FSWL) in a first set of a plurality of antenna side lobes, and transmitting data packets in a second set of a plurality of antenna side lobes facing specific station.  25. The method according to p. 24, characterized in that using FSVLS identify which mobile station can transmit on the uplink a predetermined, sequential number of blocks.

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