Packet transmission in mobile telecommunications systems

Description: TECHNICAL FIELD [Detailed description of the invention]

Packet transmission in mobile communication systems Field of invention The present invention uses a base station and the same transmission channel in packet format. Pake in a wireless system with a large number of subscriber terminals that transmit data to a base station Regarding wireless services, it relates to a method of controlling packet transmission. That way The base station transmits the packet to the terminal, and the packet is directed to which terminal each packet is directed to. Data indicating whether or not it has been deleted, actual data, and transmission of the terminal on the transmission channel Includes control data to control the feed. Conventional technology Regarding wireless systems, packet wireless services are from a fixed network. A service that uses known packet switching technology. Usually used Commercial wireless systems are circuit switching. Circuit switching connects the specified capacity of the transmission capacity It is a method of making a connection between users by assigning to the continuation. Between connections Throughout the day, transmission capacity is exclusively allocated to the connection. Packet switching is a Users by transmitting data in packets containing dress and control data -This is a method of making a connection between them. Several connections use the same transmission connection at the same time can do. Use packet-switched wireless systems, especially when transmitting data That is the purpose of recent research. Because, the packet switching method is transmitted The data required in software where the data to be sent is generated in bursts This is because it is very suitable for data transmission. In such cases, data transmission connection Does not have to be secured all the time during connection, if it is secured only during packet transmission good. By doing this, when building a network and using the network Significant cost and capacity savings are realized both when in use. Considering that the GSM system has been further developed, the packet wireless network The network is currently particularly interesting. GPRS (General Packet Radio Service (General) Please refer to Packet Radio Service)). ETSI GSM specification proposal (ETSI GSM 03.64, version 1.2.0, March 3, 1997) is the network part Describes the GPRS air interface between the and the subscriber terminal. In a GSM system, one physical channel is one data in a TDMA frame. Im slot. The TDMA frame has eight time slots. ET According to the SI GSM 03.64 specification proposal, one or some physics The channel, actually the traffic channel PDCH (packet data channel) (Packet Data Channel) for establishing packet wireless connections and transmitting packets Is stipulated for. The counsel channel is the PCCCH channel (packet common system). Your channel (Packet Common Control Channel) and packet traffic Divided into Chanel. The packet traffic channel is the PDTCH channel ( Packet Data Traffic Channel and PACCH channel (Packet Associated Control Channel)) is included. The PCCH channel is PRACH (Packet Random Access) Seth Channel (Packet Random Access Channel) Channel, PPCH (Packet) Packet Paging Channel channel, PAGCH (Pa) Packet Access Grant Channel channel, P BCCH (Packet Broadcast Control) Channel)) Includes channels. This system asymmetrically secures resources from radio paths in different transmission directions. To. In other words, secure them independently of each other. Uplink direction, in other words terminal In the direction from to the base station, the radio path can be used simultaneously by one or more terminals, In such cases, the terminals compete to use the channel. This system , Use of wireless path in such a way that the base station transmits data packets to the terminal Control the use. In these packets, each packet is directed to which terminal Contains data indicating whether or not. In addition, the packet is transmitted by the terminal over the transmission channel. Contains control data to control. Since transmissions in different transmission directions are unrelated to each other, the terminal should also transmit something. However, the base station does not have any data to be transmitted to the terminal. The situation is easy to occur. However, in the prior art solution, the terminal has a wireless path. Since the data indicating the user is not received from the base station, the terminal can transmit. Can not. In such cases, the terminal will prevent the base station from transmitting data to the terminal. I have no choice but to wait. Therefore, in that case, the radio path resource is used very inefficiently. Will be done. Outline of the invention Therefore, an object of the present invention is that radio path resources can be used more efficiently than before. To provide a method. This is achieved by the type of method described in the preamble of the claim. The method is that if there is no actual data, the base station will control the transmission instead of the actual data. It is characterized by transmitting a packet containing the data to the terminal. The method of the present invention has several advantages. According to the present invention, the base station is transmitted to the terminal. Tigers in different transmission directions, whether or not they have data to be sent You can control the fix. Therefore, the capacity of the uplink is substantially increased. can do. A brief description of the drawing The present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 illustrates a system to which the methods of the invention can be applied. Figure 2 shows the general configuration of a GSM time division frame. FIG. 3 illustrates the configuration of a typical packet transmitted by a base station. Detailed description of the invention Consider FIG. 1 illustrating a wireless system to which the methods of the invention can be applied. Wireless system The system contains at least one base station 100, which is a subscription within the area. Communicating with personal terminals 102 to 106. Base station controllers, in order, 1 if Or control the operation of some base stations. In wireless systems, user voice and And data traffic uses traffic channels to base stations and subscriber terminals Is transmitted to and from. In addition, various control messages transmitted over the control channel And system data is required between the base station and the subscriber terminal. Solution of the present invention The case where the measure is applied to the GSM system will be described below. However, G It is not limited to SM systems. Figure 2 shows the general configuration of a GSM frame. GSM frames are 0 to 7 Eight time slots with numbers up to. In general, the base station goes Transmits several carrier frequencies, each containing 8 time slots during its use Has a frame. Of course, the corresponding frame is used in the opposite transmission direction ing. In this example, subscriber terminals 102 and 104 in FIG. 1 are packets to base station 100. Using circuit-switched connections, subscriber terminal 106 normally connects to base station 100 with circuit-switched connections 11 2 Suppose you are. Base station 100 sets a frame according to FIG. 2 at a predetermined frequency. To transmit. Circuit switching for terminal device 106, for example, for a normal telephone call Suppose you want to assign time slot 4 to the connection. In addition, time slot 1 is Suppose it is reserved for bucket-style traffic. In other words, this ta PDCH (Packet Data Ch annel)) Create a channel and use packet-switched connections on this channel. Suppose you are transmitting terminal packets. Therefore, terminals 102, 104 and base station 1 Traffic 108 and 110 to and from 00 are exchanged in this time slot To. Thus, terminals 102 and 104 use the same transmission channel, These data packets are transmitted to the base station 100. In such a case, of course, the system The same in the way your system is needed and controlled by its control system Channels can be split between several terminals that use the channel. Main departure In the clear method, this control controls the packets transmitted to the terminal by the base station. Depending on the control data, which contains the data, the terminal can be deleted at a specific time. A method that can detect whether it is the turn to transmit the data to the base station. It will be carried out at. FIG. 3 illustrates the configuration of a typical packet transmitted by a base station. Pake There are three main fields: MAC (Medium Acc). ess Control)) Header, data field, BCS (block check sea) Contains the Kens (Block Check Sequence) field. 3 MAC headers Includes elements. USF (Uplink State Flag) is a terminal Indicates the uplink status. In other words, which one uses a common transmission channel Indicates whether the terminal can then transmit data to the base station. T is a block type indicator Data and PC are data related to power regulations. These fields are from the main It's not important to Ming, so I won't go into detail here. Regarding the physical link layer The same applies to the BCS field. The data block now contains two elements. The first element is the so-called RLC The header (Radio Link Control header), So-called temporary frame identification (TFI) data is transmitted there. Based on that data, the terminal is directed to which terminal the packet data is directed to. Can be identified. The data is contained in the data field of the latter element To. The above configuration and different elements of the packet are incorporated herein by reference to ETSI. Explained in more detail in documentation GSM 03.64 version 1.20 It has been. In this application, the transmission unit is referred to as a packet. Packet wireless service The computer may be part of a larger packet transmission network. like this If not, the packets of this application are part of all packets of the packet transmission network. Minute packets, or sections, for transmissions that take place over radio lines , Divided into several subpackets, ie sections. Larger An example of a transmission network is the Internet. If the base station has data directed to the terminal, the base station will send the above packet. Use to transmit data. The TFI data of the packet is the packet to which terminal The USF field of the packet indicates if it is aimed at a particular time, Indicates which terminals are allowed to transmit in the uplink direction. In the solution of the present invention, if there is no actual data, the base station is not the actual data. A packet containing transmission control data is transmitted to the terminal. Therefore, these packages In the data field, the data field does not contain the data directed to the terminal, which contains the data. There is an arbitrary bit sequence or a predetermined bit sequence instead of the data. Package Contains the USF field, which terminal is in the uplink direction Contains data indicating whether transmission is permitted. To prevent the device from trying to identify data that does not contain important data , The packet of the solution of the present invention contains data for which the packet should be transmitted to a terminal. Contains data indicating that it is not. This is achieved with TFI data. TFI For the bit, select a combination that does not indicate the terminal that uses the connection. This way Each terminal receives a packet to be transmitted, and the USF fee is received from the packet. Identify information about the use of uplinks in the field and its fields and TF I Identify the data and based on that data, the actual packet destined for the terminal Recognize that it does not contain any data. Therefore, the methods of the invention apply with respect to GRPS packet radio services. Is preferable, but it depends on the data packet transmitted by the base station. It can also be applied to other services where plink control is implemented. Although the present invention has been described above for an example according to the accompanying drawings, the present invention is Not limited to this, but various within the scope of the ideas of the present invention disclosed in the appended claims. It should be understood that it can be changed by the method.