MXPA98002981A - Pack channel feedback - Google Patents

Abstract

The present invention relates to a method for improving the efficiency of the packet data channel by providing a means for interrupting transmissions to or from a first mobile station in order to allow a short message to be communicated between the communication system and the station. different mobile. The packet channel feedback information includes several flags: Busy / Reserved / Inactive (BRI), Received / Not Received (R / N), Partial Eco (PE), and Partial Eco Qualifier (PEQ). The PEQ allows the communication system to interrupt transmission to a mobile station to send a short message to another mobile station. By graduating the PEQ to different values, a mobile station can determine if the subchannel capacity has been temporarily interrupted and re-assigned to another station

Description

"PACKAGE CHANNEL FEEDBACK" BACKGROUND Applicants' invention relates to electrical telecommunication, and more particularly, to wireless communication systems such as cellular and satellite radio systems, for different modes of operation (analog, digital, dual mode, etc.), and access techniques such as frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), and hybrid FDMA / TDMA / CDMA. More specifically, this invention relates to slot formats for transmissions between a communication system and a mobile station in a packet data channel. In North America, digital communication and multiple access techniques such as TDMA are currently provided by a digital cellular radio telephone system called the advanced digital mobile phone service (D-AMPS), some of the features of which are specified in the interim standard TIA / EIA / IS-54-B. The "Dual-Compatibility Mobile Station Compatibility Standard for Base Station", published by the Association of Telecommunications Industry and Electronic Industries Association (TIA / EIA). The TIA / EIA / IS-54-B standard is incorporated in this application by reference. Because a large existing consumer equipment base operates only in the analog domain with frequency division multiple access (FDMA), TIA / EIA / IS-54-B is a dual mode (analogue and digital) standard, providing analog compatibility together with digital communication capability. For example, the TIA / EIA / IS-54-B standard provides both analog voice channels of FDMA (AVC) and digital traffic channels of TDMA (DTC). The AVC and DTC are implemented by radio frequency modulation carrier signals, which have frequencies of about 800 megahertz (MHz) in such a way that each radio channel has a spectral width of 30 kilohertz (KHz). In the TDMA cellular radiotelephone system, each radio channel is divided into a series of time slots, each of which contains a burst of information from a data source, e.g., a digitally coded portion of a voice conversation. The time slots are grouped into successive TDMA frames that have a predetermined duration. The number of time slots of each TDMA frame is related to the number of different users that can simultaneously share the radio channel. If each slot in a TDMA box is assigned to a different user, the duration of a TDMA box is the minimum amount of time between the successive time slots assigned to the same user. The successive time intervals assigned to the same user, which are usually not consecutive time intervals in the radio bearer, constitute the digital traffic channel of the user, which can be considered a logical channel assigned to the user. As described in more detail below, the digital control channels (DCC) can also be provided to communicate the control signals, and this DCC is a logical channel formed by a succession of time intervals usually not consecutive in the radio bearer. If only one of the many possible modalities of a TDMA system is as described above, the TIA / EIA / IS-54-B standard as long as each TDMA frame consists of six consecutive time intervals, and have a duration of 40 milliseconds (msec). Therefore, each radio channel can carry from three to six DTCs (eg, from three to six telephone conversations), depending on the source codes of the encoder / speech decoders (codees) used to digitally encode the conversation . These speech codes can work either full-time or half-time. A full-regime DTC requires twice as many time intervals in a given time period as the half-time DTC, and in TIA / EIA / IS-54-B, each full-regime DTC uses two intervals of each TDM box, that is, the first and fourth, the second and the fifth or the third and sixth of a table of TDMA of six intervals. Each half-interval DTC uses a time interval of each TDMA frame. During each DTC time slot, 324 bits are transmitted, of which the predominant portion, 260 bits, is due to the codec speech output, including bits due to error correction coding of the speech output, and Remaining bits are used for protection times and send signals for purposes such as synchronization. It could be seen that the cellular system of TDMA operates in a buffer and burst mode, or discontinuous transmission: each mobile station transmits (and receives) only during its assigned time intervals. At a full rate, for example, a mobile station could transmit during interval 1, receive during interval 2, be inactive during interval 3, transmit during interval 4, receive during interval 5 and be inactive during interval 6 and Then repeat the cycle during the successive TDMA frames.

Therefore, the mobile station can be battery powered, it can be disconnected or put to sleep to save energy during the time intervals when it is neither transmitting nor receiving. In addition to the voice and traffic channels, the cellular radio communication systems also provide radiolocation / access channels, or control to carry established messages per call between the base stations and the mobile stations. According to TIA / EIA / IS-54-B, for example, there are twenty one dedicated analog control channels (ACC), which have predetermined fixed frequencies for transmission and reception placed close to 800 MHz. Since these ACCs are always at the same frequencies can be easily located and monitored by mobile stations. For example, when in an inactivated state (ie, connected but not making or receiving a call), a mobile station in a TIA / EIA / IS-54-B system is tuned to and then regularly monitors the control channel more intense (generally, the control channel of the cell where the mobile station is placed at that moment) and can receive or initiate a call through the corresponding base station. When moving between the cells while in the inactive state, the mobile station will eventually "lose" the radio connection in the control channel of the "old" cell and will be tuned to the control channel of the "new" cell . The initial tuning and the subsequent re-tuning to control the channels both are achieved automatically by scanning all available control channels at their own frequencies to find the "best" control channel. When a control channel with good reception quality is found, the mobile station remains tuned to this channel until the quality deteriorates again. In this way, the mobile stations remain "in contact" with the system. While in the inactive state, a mobile station must monitor the control channel to radiolocate messages directed to it. For example, when a regular (land) telephone subscriber calls a mobile subscriber, the call is routed from a public switched telephone network (PSTN) to a mobile switching center (MSC) that analyzes the dialed number. If the desired number is validated, the MSC requests that some or all of the number of the radio base station radiolocate the called mobile station to transmit through its respective control channels the radiolocation messages containing the mobile identification number ( MIN) of the mobile station called.

Each inactive mobile station that receives a radiolocation message compares the received MIN with the stored MIN itself. The mobile station with the matching stored MIN transmits a radiolocation response through the specific control channel to the base station, which sends the radiolocation response to the MSC. Upon receiving the radiolocation response, the MSC selects an available AVC or DTC to the base station that received the radiolocation response, connects to a corresponding radio transceiver at that base station and causes the base station to send a message through the control channel to the mobile station that instructs the mobile station called to tune to the selected voice or traffic channel. A complete connection for the call establishes once the mobile station has tuned to the selected AVC or DTC. The performance of the ACC system that is specified by TIA / EIA / IS-54B has been improved in a system that has digital control channels (DCCH) that is specified in TIA / EIA / IS-136, which is expressly incorporated in the present by reference. An example of this system that has the DCC with new formats and processes is described in the North American Patent Application Number 07/956, 640 called "Digital Control Channel", which was presented on October 5, 1992, and which is incorporated in this application by reference. Using these DCCs, each TIA / EIA / IS-54 radio channel can carry only the DTCs, only the DCCs, or a mixture of both DTC and DCC. Within the framework of TIA / EIA / IS-136, each radio carrier frequency can have up to three DTC / DCC full regime, or six DTC / DCC half-speed or, any combination between them, for example, a DTC / Full-regime DCC and four medium-duty DTC / DCC. In general, however, the transmission regime of the DCC does not need to coincide with the half-speed and full regime specified in TIA / EIA / IS-54, and the length of the DCC intervals may not be uniform and may not coincide with the length of the DTC intervals. The DCC can be defined in a radio channel of TIA / EIA / IS-54 and can consist, for example, of each n-th interval in the stream of the consecutive TDMA intervals. In this case, the length of each DCC interval may or may not equal 6.67 milliseconds, which is the length of a DTC interval in accordance with TIA / EIA / IS-54. Alternatively, (and without limitation on other possible alternatives), these DCC ranges can be defined in other ways known to a person skilled in the art.

In cell phone systems, an air link protocol is required in order to allow a mobile station to communicate with the base stations and the MSC. The communications link protocol is used to initiate and receive cell phone calls. As described in U.S. Patent Application Number 08 / 477,574 called "Layer 2 Protocol for the Random Access Channel and the Access Response Channel", which was filed on June 7, 1995 and which was incorporated in this application by reference, the communication link protocol is commonly referred to as within the communications industry as a Layer 2 protocol, and its functionality includes the delimitation, or framed, of the Layer 3 messages. Layer 3 messages may be sent between the peer entities of Layer 3 communication remaining within the mobile stations and the cellular switching systems. The physical layer (Layer 1) defines the parameters of the physical communications channel, eg, radio frequency separation, modulation characteristics, etc. Layer 2 defines the techniques necessary for the exact transmission of information within the constraints of the physical channel, v.gr, correction and error detection, etc., Layer 3 defines the procedures for the reception and processing of transmitted information through the physical channel. The communications between the mobile stations and the cellular communication system (the base stations and the MSC) can be described generally with reference to Figures 1 and 2. Figure 1 schematically illustrates the pluralities of the messages 11 of Layer 3 , Layer 2 frames 13, Layer 1 channel bursts, or time slots 15. In Figure 1, each group of channel bursts corresponding to each Layer 3 message may constitute a logical channel , and as described above, channel bursts for a determined Layer 3 message will usually not be consecutive intervals in a TIA / EIA / 136 bearer. On the other hand, channel bursts could be consecutive; As soon as a time interval ends, the next time interval could begin. Each channel burst 15 of Layer 1 contains a complete Layer 2 box as well as other information such as, for example, error correction information and other information used for the operation of Layer 1. Four Layer 2 each contains at least a portion of a Layer 3 message as well as information used for the operation of Layer 2. Even if not indicated in Figure 1, Layer 3 message layer would include different elements of information that can be considered as the profitable message load, a header portion to identify the respective message type and possibly fill. Each burst of Layer 1 and each Layer box 2, it is divided into a plurality of different fields. In particular, a DATA field of limited length in each frame of Layer 2 contains message 11 of Layer 3. Since Layer 3 messages have varying lengths depending on the amount of information contained in the Layer message 3, a plurality of frames of Layer 2 may be required for transmission of a single Layer 3 message. As a result, a plurality of Layer 1 channel bursts may also be necessary to transmit the entire Layer 3 message since there is a one-to-one match between channel bursts and Layer 2 frames. As mentioned above, when more than one channel burst is required to send a Layer 3 message, the different bursts are usually consecutive bursts in the radio channel. Furthermore, the different bursts are not usually successive bursts dedicated to the specific logical channel used to carry the Layer 3 message. Since it takes time to receive, process and react each burst received, the bursts required for transmission of a message of Layer 3 are usually sent in a staggered format as illustrated schematically in Figure 2 (a) and as described above in relation to the TIA / EIA / IS-136 standard. Figure 2 (a) shows a general example of a Front (or downlink) DCC configured as a succession of time slots 1, 2, ..., N, ... included in the consecutive time slots 1, 2, ... sent on a carrier frequency. These DCC ranges can be defined in a radio channel such as that specified by TIA / EIA / IS-136, and may consist, as seen in Figure 2 (a) for example, of each n-th interval in a series of consecutive intervals. Each DCC interval has a duration that may or may not be 6.67 milliseconds which is the length of a DTC interval in accordance with the TIA / EIA / IS-136 standard. As shown in Figure 2 (a), the DCC intervals can be arranged in superframes (SF), and each superframe includes a number of logical channels that carry different kinds of information classes. One or more of the DCC intervals can be assigned to each logical channel in the superframe. The exemplary downlink superframe in Figure 2 (a) includes three logical channels: a broadcast control channel (BCCH) including six successive intervals for raised messages; a radiolocation channel (PCH) including an interval to radiolocate messages; and an access response channel (ARCH) including an interval for channel assignment and other messages. The remaining time intervals in the exemplary superframe of Figure 2 can be dedicated to other logical channels, such as the additional radiolocation PCH channels or other channels. Since the number of mobile stations is usually much greater than the number of slots in the superframe, each paging interval is used to radiolocate several mobile stations that share some unique features, eg, the last digit in the MIN. Figure 2 (b) illustrates a preferred information format for the intervals of a front DCC. Figure 2 (b) indicates the number of bits in each field above that field. The bits sent in the synchronization information (SYNC) are used in a conventional manner to help ensure accurate reception of the CSFP and DATA fields. The SYNC information carries a predetermined bit pattern used by the base stations to find the beginning of the interval. The SCF information is used to control the random access channel (RACH), which is used by the mobile station to request access to the system. The CSFP information transfers a coded superframe phase value that allows mobile stations to find the start of each superframe. This is just an example for the information format in the front DCC ranges. For purposes of efficient sleep mode operation and fast cell selection, the BCCH can be divided into a number of subchannels. US Patent Application Number 07/956, 640 discloses a BCCH structure that allows the mobile station to read a minimum amount read a minimum amount of information when it is connected (when looking at a DCC) before being able to access the system (place or receive a call). After connecting, an inactive mobile station needs to regularly monitor only its allocated PCH intervals (usually one in each superframe); the mobile station can rest during other intervals. The relation that the time of the mobile station requires to read the radiolocation messages and their time required for rest is controllable and represents a change between the delay to establish the call and the power consumption. Since each TDMA time slot has a certain fixed information bearer capability, each burst typically carries only a portion of a Layer 3 message as mentioned above. In the uplink direction, the multiple mobile stations try to communicate with the system on a containment basis, while the multiple mobile stations listen for the Layer 3 messages sent from the system in the downlink direction. In known systems, any given message from Layer 3 must be carried using as many TDMA channel bursts as required to send the entire Layer 3 message. Digital and traffic control channels are desirable due to these and other reasons described in the North American Patent Application Number 08 / 147,254, called "A Method for Communicating in a Wireless Communication System" that was filed on November 1, 1993, and which is incorporated in this application by reference. For example, they support longer periods of rest for mobile units, which results in prolonged battery life. The digital traffic channels and the digital control channels have expanded the functionality to optimize the capacity of the system and support hierarchical cell structures, that is, structures of macrocells, microcells, picocells, etc. The term "macrocell" usually refers to a cell having a size comparable to the cell sizes in a conventional cellular telephone system, (e.g., a radius of at least about 1 kilometer), and terms "microcell" and "picocell" usually refer to progressively smaller cells. For example, a microcell could cover an indoor or outdoor public area, v. gr., a convention center or a busy street, and a picocell could cover an office corridor or a floor of a high-rise building. From a radio coverage perspective, macrocells, microcells and picocells may be different from one another or may overlap one another to handle traffic patterns of different radio environments. Figure 3 is an exemplary hierarchical or multilayer cellular system. A parasol macrocell 10 represented by a hexagonal shape constitutes an overlying cellular structure. Each umbrella cell may contain an underlying microcell structure. The umbrella cell 10 includes microcell 20 represented by an area enclosed within a dotted line and microcell 30 represented by the area enclosed within the dashed line corresponding to the areas along any of the streets of the city, and the 40, 50 and 60 picocells, which cover individual floors of a building. The intersection of two city streets covered by microcells 20 and 30 can be an area of dense traffic concentration and therefore could represent a hot zone. Figure 4 depicts a functional diagram of an exemplary cellular mobile radiotelephone system, including an exemplary base station 110 and a mobile station 120. The base station includes a control and processing unit 130 which is connected to the MSC 140 which it is connected to the PSTN (not illustrated). The general aspects of these cellular radiotelephone systems are known in the art, as described by the aforementioned US Patent Applications and US Pat. No. 5,175,867 issued to Wejke et al., Entitled "Neighbor-assisted Delivery in a Communication System. Cellular ", and the North American Patent Application Number 07 / 967,027 called" Processing of Multiple Mode Signals "that was filed on October 27, 1992, both of which are incorporated in this application by reference. The base station 110 handles a plurality of voice channels through a voice channel transceiver 150 which is controlled by the control and processing unit 130. Likewise, each base station includes a - l control channel 160 transceiver that may be capable of handling more than one control channel. The control channel transceiver 160 is controlled by the control and processing unit 130. The control channel transceiver 160 broadcasts the control information through the control channel of the base station or cell to the mobile stations linked to that control channel. It will be understood that transceivers 150 and 160 can be implemented as a single device such as a voice and control transceiver 170, for use with DCCHs and DTCs share the same radio carrier frequency. The mobile station 120 receives the information broadcast on a control channel on its voice channel and control transceiver 170. Then, the processing unit 180 evaluates the received control channel information that includes the characteristics of the cells that are candidates for the mobile station to be linked and determines in which cell the mobile station should be linked. Advantageously, the information of the received control channel not only includes absolute information related to the cell with which it is associated but also contains relative information related to other cells next to the cell with which the control channel is associated as described in FIG. U.S. Patent No. 5,353,332 issued to Raith et al., Entitled "Method and Apparatus for Control of Communication in a Radiotelephone System", which is incorporated in this application by reference. To increase the "talk time" of the user, i.e. the battery life of the mobile station, US Patent Application Number 07 / 956,640 discloses a digital front control channel (base station and mobile station). ) it may be able to carry the specified message types for the current analogical front control channels (FOCC), but in a format that allows a mobile station to read the raised messages when it is blocked in the FOCC and then only when the information has changed; the mobile station rests at all other times. In this system, other types of messages are broadcast by base stations more frequently than other types, and mobile stations do not need to read each message broadcast. The systems specified by the TIA / EIA / IS-54 and TIA / EIA / IS-136 standards are circuit switched technology that is a "connection-oriented" type of communication that establishes a physical call connection and maintains that connection at all times. and when the final communication systems have data to exchange. The direct connection of a circuit switch serves as an open pipeline, allowing the end systems to use the circuit for what they deem appropriate. Even when circuit switched data communication may be appropriate for constant bandwidth application, it is relatively inefficient for low bandwidth and "burst" applications. Packet switched technology, which can be oriented by connection (eg, X.25) or "be free of connection" (eg, Internet Protocol, "IP"), does not require establishment and cancellation of a physical connection that is in remarkable contrast to circuit switched technology. This reduces the latency of the data and increases the efficiency of a channel to handle relatively short, bursty or interactive transactions. A packet-switched switched network distributes the routing functions to multiple routing sites, thus avoiding possible traffic jams that could occur when using a central switching plug. The data is "packaged" with the appropriate address of the final system and then transmitted in independent units along the data path. Intermediate systems, sometimes called "routers" stationed between the final communication systems, make decisions about the most appropriate route to acquire a base per package. Routing decisions are based on a number of features including: lowest cost route or metric cost; link capacity; number of packages awaiting transmission; security requirements for the link; and the current state of operation of the intermediate system (node). The transmission of the packet along a route that does not take into account the path metric, as opposed to a single established circuit, offers flexibility of application and communications. It is also the way in which most of the normal local area networks (LAN) and wide area networks (WAN) have developed in the social environment. Packet switching is appropriate for data communications because many of the applications and devices used, such as keyboard termials, are interactive and transmit the data in bursts. Instead of a channel being inactive while a user admits more data in a terminal or standby to think about a problem, the packet switching intersperses the multiple transmissions from several terminals to the channel. The packet data provides more network robustness due to path independence and the ability of routers to select alternative paths in case of network node failure. The switching of the packet therefore allows the most efficient use of the lines of the network. The package technology offers the option to bill the end user based on the amount of data transmitted instead of the connection time. If the end-user application is designed to make efficient use of the air link, then the number of packets transmitted will be minimal. If each individual user's traffic is kept to a minimum, then the service provider has effectively increased the capacity of the network. Packet networks are usually designed and are based on data standards across the industry such as the open system interface model (OSI) and the TCP / IP prototype stack. These standards have been developed, either formally or de facto, for many years and the applications that use these protocols can usually be obtained easily. The main purpose of standards-based networks is to achieve interconnectivity with other networks. The Internet is currently the most obvious example of the search for the network based on standards of this kind. Packet networks, like the Internet or social LAN, are integral parts of today's media and business environments. As the calculation of the mobile station becomes pervasive in these environments, wireless service providers such as those using TIA / EIA / IS-136 are better positioned to provide access to these networks. However, the data services provided by or proposed for cellular systems are generally based on circuit switched mode of operation, using a dedicated radio channel for each active mobile user. Figure 5 shows the representative architecture used to communicate through an air link comprising the protocols that provide connectivity between a mobile end system (M-ES), and a mobile data base station (MDBS), and a system intermediate mobile data (MD-IS). An exemplary description of the elements in Figure 5 and a recommended approach for each element when alternative radiofrequency technologies are taken into account is given below. The Internet Protocol / Connection Exempt Network Protocol (IP / CLNP) are network protocols that are connection-free and widely supported through the traditional data network community. These protocols are independent of the physical layer and preferably do not change as radio frequency technologies change. The Security Management Protocol (SMP) provides security service through the air link interface. The services provided include data link confidentiality. Authentication of M-ES, key management, access control and quality improvement / algorithm reset. The SMP must remain unchanged when alternative radiofrequency technologies are implemented. The Radio Resource Management Protocol (RRMP) provides administration and control through the use of the mobile unit of radio frequency resources. The RRMP and its associated procedures are specific to the AMPS radio frequency infrastructure and require change based on the radio frequency technology implemented. The Mobile Network Registration Protocol (MNRP) is used in tandem with a Mobile Network Location Protocol (MNLP = to allow the proper registration and autication of the mobile end system.) The MNRP must be unchanged walternative radiofrequency technologies are used The Mobile Data Link Protocol (MDLP provides efficient data transfer between MD-IS and M-ES The MDLP supports efficient movement of the mobile system, energy conservation of the mobile system, sharing the resources of the radiofrequency channel and efficient error recovery.The CDM must remain unchanged walternative radiofrequency technologies are used.

The Medium Access Control (MAC) protocol and associated procedures control the use of the M-ES methodology to manage shared access with the radio frequency channel. This protocol and its functionality must be provided by alternative radiofrequency technologies. Modulation and coding projects are used in the physical layer. These projects are specific to the radio frequency technology used, and therefore must be replaced with appropriate projects for alternative radiofrequency technology. The adoption of alternative radiofrequency technology can be implemented with a minimum amount of change with respect to the architecture of the CDPD system. The required changes are limited to the radio resource management protocol, the MAC, and the physical layers; all other network services and support services remain unchanged. The following documents describe a few exceptions to data services for cellular systems based on circuit switched mode of operation, which include the concepts of packet data. U.S. Patent Number 4,887,265, and "Packet Switching in Digital Cellular Systems", Proc. 38th IEEE Vehicular Technology Conf., Pages 414 to 418 (June 1988) describe a cellular system that provides shared packet data radio channels each being capable of accommodating multiple data calls. A mobile station requesting packet data service is assigned to a specific packet data channel using essentially sending regular cellular signals. The system can include packet access points (PAPS) to interconnect with the packet data networks. Each packet data radio channel is connected to a specific PAP and is therefore capable of multiplexing the data calls associated with PAP. Deliveries are initiated by the system in a way that is greatly similar to the delivery used in the same system for voice calls. A new delivery type is added for those situations where the capacity of a packet channel is insufficient. These documents are all oriented in the data call and are based on delivery initiated by the system in a similar manner as for regular voice calls. Applying these principles to provide packet data services for general purposes in a cellular TDMA system would result in spectrum efficiency and performance disadvantages. U.S. Patent No. 4,916,691 discloses a new cellular radiosystem structure of packet mode and a new method for routing packets (voice and data) to a mobile station. The base stations, the public switches through the trunk interface units, and the cellular control unit are linked together through the WAN. The routing procedure is based on deliveries initiated by the mobile station and adding to the head of any packet transmitted from a mobile station (during a call) an identifier of the base station through which the packet passes. In case of a prolonged period of time between the packets of subsequent user information from a mobile station, the mobile station may transmit extra control packets in order to transport the cell location information. The cell control unit is mainly involved in a call establishment, when a call control number is assigned to the call. It then notifies the mobile station of the call control number and the trunk control number unit of the call control number and the identifier of the initial base station. During a call, the packets are then routed directly between the trunk interface unit, and the base station that currently serves. The system described in U.S. Patent Number 4,916,691 does not directly relate to the specific problems of providing packet data services in TDMA cellular systems. The "Radio Package in GSM", European Telecommunications Standards Institute (ETSI) T Doc SMG 4 58/93 (February 12, 1993) and "A Proposed General Package Radio Service for GSM" presented during a seminar called "GSM in a Competitive Future Environment ", from Helsinki, Finland (October 13, 1993) indicates a possible packet access protocol for voice and data in GSM. These documents are directly related to the TDMA cellular systems, ie, GSM, and even when they point out a possible organization of shared packet data channel carried to the optimum they do not deal with the aspects of the integration packet data channels in a total system solution. The "Data packet through the GSM network", T Doc SMG 1 238/93, ETSI (September 28, 1993) describes a concept of providing packet data services in GSM based on regular GSM using first sending signals and authentication to establish a virtual channel between a mobile packet station and an "agent" that handles access to packet data services. With regular modified signal sending for fast channel establishment and release, regular traffic channels are then used for packet transfer. This document is directly related to TDMA cellular systems, but since the concept is based on using a "fast switching" version of existing GSM traffic channels, it has disadvantages in terms of spectrum efficiency and transfer delays. package (especially for short messages) compared to a concept based on the optimized shared packet data channels. The Cellular Digital Package Data System (CDPD) Release 1.0 Specification (July 1993), describes a concept for providing packet data services using radio channels available in current Advanced Mobile Phone Service systems (AMPS), that is, the analog cellular system of North America. The CDPD is a comprehensive open specification endorsed by a group of cell phone operators in the United States. Covered articles include external interfaces, air link interfaces, services, network architecture, network administration and administration. The CDPD system specified is based to a considerable degree on an infrastructure that is independent of the existing AMPS infrastructure. Things common with AMPS systems are limited to the use of the same type of radio frequency channels and the same base station sites (the base station used by CDPD may be new and specific CDPD) and the use of a radio interface. sending signals to coordinate the channel assignments between the two systems. The routing of a packet to a mobile station is based on first routing the packet to a base network node (Base Mobile Data Intermediate System, MD-IS) equipped with a base location register (HLR) based on the address of the mobile station; then, when necessary, route the packet to a visited service MD-IS, based on the HLR information; and finally transferring the packet from the serving MD-IS through the current base station based on the mobile station disclosing its cell location to the service MD-IS. Even though the CDPD System Specification does not directly relate to the specific problems of providing packet data services in the TDMA cellular systems that are addressed by this application, the network aspects and concepts described in the CDPD System Specification may used as a basis for the network aspects necessary for an air link protocol in accordance with this invention. The CDPD network is designed to make an extension of the existing data communications networks and the AMPS cellular network. Existing connection-free network protocols can be used to provide access to the CDPD network. Since the network is always considered as developing, it uses an open network design that allows the addition of new network layer protocols when appropriate. The services and protocols of the CDPD network are limited to the Network Layer of the OSI model and below. Doing so allows the protocols of the upper layer and application development without changing the underlying CDPD network. From the perspective of the mobile subscriber, the CDPD network is a wireless mobile extension of traditional data and voice networks. Using a CDPD service provider network service, the subscriber is able to provide access to data applications, many of which can be left in traditional data networks. The CDPD system can be seen as two interrelated service sets: the support services of the CDPD network and the services of the CDPD network. The CDPD network supports the services carried out necessary to maintain and administer the CDPD network. These services are: account servers; network management system; message transfer server; authentication server. These services are defined to allow interoperability between service providers. Since the CDPD network is technically developed beyond its original AMPS infrastructure, it is anticipated that the support services will remain unchanged. The functions of network support services are necessary for many mobile networks that are independent of radio frequency (RF) technology. The CDPD network services are data transfer services that allow subscribers to communicate with data applications. In addition, one or both ends of the data communication can be mobile. To summarize, there is a need for a system that provides packet data services for general purposes in D-AMPS cellular systems, based on providing shared packet data channels optimized for the package data. This application is directed to systems and methods that provide the combined advantages of a connection-oriented network similar to that specified by the TIA / EIA / IS-136 standard and a connection-free packet data network. In addition, the invention is directed to improve the synchronization, decoding and coding of aspects of electrical communication in wireless communication systems.

COMPENDIUM In accordance with one embodiment of this invention, a communication system provides packet channel feedback information to the mobile stations communicating with the system. An object of one embodiment of this invention is to provide maximum efficiency of the packet data channel by providing a means to interrupt transmissions in order to allow transmissions from other mobile stations that are either trying to access the system or have already had access to the system. system and are in the process of sending package information information. In accordance with the present invention, the feedback information of the packet channel includes several flags: from Occupied-Reserved / Inactive (BRI); Received / Not Received (R / N); Eco Partial (PE); and Partial Eco Qualifier (PEQ). The PEQ allows the communication system to interrupt transmission from a mobile station to allow transmissions from another mobile station. By graduating the PEQ to different values, the communication system can dynamically assign the property of the RACH subchannels and thus indicate to the mobile stations whether their subchannel property has been temporarily interrupted or reassigned to another mobile station.

In accordance with another aspect of the invention, the full-rate packet data channel consists of three sub-channels that have been allocated in order to provide sufficient processing time for both a mobile station and a base station, together with an event of random access, in the RACH.

BRIEF DESCRIPTION OF THE DRAWINGS The particularities and advantages of the Applicants' invention will be understood by reading this description together with the drawings, in which: Figure 1 schematically illustrates the plurality of Layer 3 messages, the Layer 2 frames and the channel bursts of Layer 1, or time intervals; Figure 2 (a) shows a front DCC configured as a succession of time slots included in the consecutive time slots sent to a carrier frequency; Figure 2 (b) shows an example of a DCCH field interval format of IS-136; Figure 3 illustrates an exemplary jeriarchic, or multilayer, cellular system; Figure 4 is a functional diagram of an exemplary cellular mobile radiotelephone system including an exemplary base station and mobile station; Figure 5 shows a protocol architecture for communicating through an air link; Figure 6 illustrates the logical channels in D-AMPS; Figure 7 illustrates an example of a possible map trace sequence; Figure 8 illustrates an example of an interval format for BMI? MS in the PDCH; Figure 9 illustrates a series of sub-states associated with mobile station processing in an access attempt in layer 2; Figure 10 illustrates the PRACH subchannels that are used in a full-regime PDCH; Figure 11 illustrates an example of a dialogue between a mobile station and a communication system; Figure 12 illustrates the communication of a mobile station of a full-regime PDCH; Figure 13 illustrates three mobile stations communicating in a full-regime PDCH; Figure 14 illustrates a mobile station communicating in a triple-rate PDCH; and Figure 15 illustrates the DCCH subchannels for full-scale DCCH in accordance with IS-136.

DETAILED DESCRIPTION The present invention relates to interval formats for transmissions between a communication system and a mobile station in a packet data channel. To aid in the understanding of the present invention the structure of the D-AMPS logical channel game is illustrated in Figure 6. As illustrated, the digital control channel (DCCH) has a reverse access channel (RACH) in the reverse address and a broadcast control channel (BCCH), an SPACH channel (radiolocation channel, short message service, access request channel, shared channel feedback) (SCF) and a reserved channel (RSVD) in the forward direction. The packet data channel (PDCH) has a packet random access channel (PRACH) in the reverse direction and a packet broadcast control channel (PBCCH), a PSPACH channel (packet radiolocation PPCH channel and a packet access response PARCH channel), a packet channel feedback (PCF) and a reserved channel in the forward direction.

Figure 7 shows an example of a dedicated PDCH in the manner in which a layer 3 message is mapped in several frames of layer 2, an example of a map stroke of the layer 2 box in a time slot and an example of a map stroke of the time interval to a PDCH channel. The length of the FPDCH time slots and the PRACH bursts are fixed. There are three possible ways of PRACH bursts (normal, abbreviated and auxiliary) that have different fixed lengths. The FPDCH ranges in a full-regime PDCH are assumed to be in the physical layer in Figure 8. In the present invention, the structure of the TDMA frame is the same as for the DCCH of IS-136 and DTC. In the interest of maximum performance when using a multi-rate channel (double-rate PDCH and triple-rate PDCH), an additional FDPCH integer format is specified. Figure 8 illustrates the additional interval format that is provided by this invention. Figure 8 illustrates an interval format for transmissions between the communication system and a mobile station in a packet data channel. In this mode, the interval format is divided into seven fields; a synchronization field (SYNC) for providing synchronization information in the mobile station, a packet channel feedback field (PCF), a first data field (DATA), a coded superframe phase feedback field / channel packet (CSFP / PCF), a second data field, a second packet channel feedback field (PCF), and a reserved field (RSVD). The packet channel field is used to control the accesses in the PRACH and is comprised of several flags: Busy / Reserved / Inactive (BRI); Received / Not Received (R / N); Eco Partial (PE) as described in IS-136. However, in this invention, the packet channel feedback field also contains a flag of the Partial Eco Qualifier (PEQ). The BRI flag is used to indicate whether the PRACH channel is busy, reserved, or inactive. The flag can be a total of six bits in length and is interspersed with the other PCF flags. The R / N flag is used to transmit the current status of received / not received of the individual bits sent to the base station in the PRACH. The partial echo flag is used to indicate which mobile station is attempting an access to containment base has had its corrected burst received by the communication system. For this purpose, the communication system can set PE equal to the seven least significant bits of the identity of the mobile station sent as part of the access attempt to the mobile station. The partial echo flag is also used to request or request a response from a mobile station while it is in the process of receiving an automatic retransmission request mode transmission. For this purpose, the communication system can grade PE equal to assigned PE (PEA) to the mobile station in the first interval sent to the mobile station within the context of a particular automatic retransmission request transmission (ARQ) mode. The partial echo flag is also used to indicate when a mobile station is trying to access a non-ARQ-related reservation base, it must begin transmitting the message. For this purpose, the communication system graduates the PE equal to the seven least significant bits of the identity of the mobile station used by the communication system to send a mobile station message. In accordance with one embodiment of the invention, the CSFP / PCF field is used to transmit the information related to the superframe phase (so that the mobile stations can find the beginning of the superframe) and to provide the partial echo qualifier information. In one mode, the CSFP / PCF field contains 12 bits (D0-D11). The PEQ flag is used by the communication system to dynamically assign the PRACH sub-channels in order to provide an efficient means to interrupt the transmission of a first mobile station and thus allow the transmission of the other mobile stations that are either trying to have access to the system or have already had access to the system and are in the process of sending the packet data information. The PEQ flag can be assigned two bits within a CSFP / 12-bit PCF field. For example, the PEQ flag may be assigned bits D6 and D5, however, the present invention is not limited to this. The coding rules for the PEQ flag will now be described and illustrated in Table 1. When bits D6 and D5 are set to zero, no sub-channel management activity is defined and the PE flag is not associated . When bits D6 and D5 are graded to zero and a subchannel property respectively is interrupted after the first burst of an access attempt and reassigned to the owner of a previous sub-channel. In this case, the PE flag is associated with the R / N flag. When the bits D6 and D5 are graded to one and zero, respectively, the property of the sub-channel is interrupted after the second attempt or a subsequent burst of an access attempt and is reassigned to a mobile station with a matching PE. In this case, the PE flag is associated with the BRI flag. Finally, when both bits D6 and D5 are graded to one, the property of the subchannel is not interrupted after the first attempt of a subsequent burst of an access attempt and therefore remains assigned to the owner of the current subchannel. In this case, the PE flag is associated with both the R / N flag and the BRI flag. It will be appreciated by a person skilled in the art that other bit pairs can be used and that this invention is not limited to the bit pair (D6 and D5) described above.

TABLE 1 - PEQ CODING RULES Assignment of Sub-channel and Association of PE PEQ dg d ^ No RSVD 0 0 sub-channel management activity is currently defined for this PEQ value. The PE is not associated.

The subchannel property INT] _ 0 1 is interrupted after the first burst of access attempt and is reassigned to the owner of the previous subchannel. PE is associated with the R / N flag The property of the sub-channel INT-INT2 1 0 is interrupted after the second or last burst of access attempt and is re-assigned to the mobile station with the matching PE. The PE is associated with the BRI flag The sub-property of the sub-channel is not NO_INT 1 0 interrupted after the first burst of access attempt and therefore remains assigned to the owner of the current sub-channel. PE is associated with R / N and BRI.

The PCF flags are carried in the FPDCH time slots and serve to indicate the current status of the communication system reception of the bursts previously transmitted in the RDCCH. PCF flags are also used to indicate the current status of availability, that is, occupied / reserved / inactive, or its corresponding PRACH bursts. A mobile station that has a pending access reads the PCF flags to determine when to begin its access attempt. When the layer 3 in the mobile station sends a primitive PRACH Request to layer 2 or a Current Status of ARQ is requested by the communication system during an ARQ Mode transaction, the mobile station initiates an access attempt in the PRACH. The sub-state seri with a mobile station processing an access attempt in layer 2 is shown in Figure 9. A mobile station is considered as being in an inactive state when it is not in the process of making an access attempt in the PRACH. From the inactive state, a mobile station can either start a reserved access or a random access. A mobile station supports the status of Start Random Access when any of the following conditions occur: the mobile station decides to perform an access on the unsolicited system; the mobile station is required to perform a requested system access as a result of successfully receiving a complete FPDCH message with SRM = 0; the mobile station is required to effect a requested system access as a result of the ARQ mode transaction when the mobile station receives an ARQ frame with Pl = 1 and ARM = 0; or the mobile station is required to make a requested system access as a result of receiving an R / N = Not Received flag after sending the first burst of an access attempt based on a reservation. A mobile station supports the state of Starting a Reserved Access when any of the following conditions occur. 100 milliseconds after a mobile station successfully receives the last frame L2 of a PSPACH message where SRM = 1 and all the L2 frames used to send the PSPACH message and where the received PSPACH message requests a response from the mobile station in the PRACH; or immediately after a mobile station successfully receives an ARQ Mode START Box or a CONTINUE Mode of the ARQ Mode having Pd 1 and ARM = 1. A mobile station supports the status of More Bursts and, after successfully transmitting the first burst of your access attempt there is one or more additional bursts that still require transmission. A mobile station remains in the Most Bursts state until it has transmitted all bursts of its access attempt but is still waiting for PCF feedback for at least its burst transmitted to the latter. The mobile station may, however, be waiting for the PCF feedback for more than its last burst transmitted due to the dynamic PRACH subchannel allocation. If dynamic RPDCH subchannel assignments are made during an access attempt, then this may result in bursts that are received out of order in the communication system. The last burst transmitted therefore is not necessarily the burst that contains the last frame of layer 2 initially prepared in format as a result of layer 2 receiving information from layer 3 within the primitive PRACH Request. The following procedures are used to make a containment or reservation based on the access attempts in the PRACH. These procedures are subject to the Random Access parameters included in the Access Parameters message sent in the F-PBCCH, and are summarized in Table 2. TABLE 2 - RANDOM ACCESS PARAMETERS BCCH Parameter Names Parameter Scale Busy / Reserved Max 0, 1 Re-entries Max. 0 - 7 Reps Max. 0 - 3 Detention Counter Max. 0, 1 As noted above, a mobile station may attempt to access in either a containment or reservation base. An access is attempted only after a mobile station has read the message of the Access Parameters in the F-PBCCH. For any given access, a mobile station is allowed a maximum of access attempts of Re-entries Max + 1, before declaring that access has failed. A given access attempt is considered to have failed if the mobile station does not decode BRI as Inactive after an attempt (Busy / Reserved Max = 0) or 10 attempts (Busy / Reserved Max = 1) or a mobile station does not find a PE match together with R / N = Received after sending the first burst of an attempt to access containment base. In addition, an access attempt is considered to have failed if the mobile station does not successfully send any determined burst after more than the Repeated Max Rept transmission in that burst, or the mobile station detects a total of consecutive Detention Counter events Max + 1 of any of the PCF conditions of the result in Stop_ctr is increased. After failing its initial access attempt, a mobile station proceeds in the following manner. If Max Re-Entries = 0, the mobile station considers access as having failed. If Max Re-Inputs = 1, the mobile station applies a first random delay evenly distributed with a granularity of 1 TDMA block before making its next access attempt. If Max Re-Entries > 1, the mobile station applies a second random delay evenly distributed with a granularity of 1 TDMA block before making its second access attempt. If Max Re-Entries > 1, the mobile station applies a third random delay evenly distributed with a granularity of 1 TDMA block before making its third or last access attempt. If a mobile station attempts random access in order to send a Radiolocation Response as a result of receiving a Triple Page Table or a Variable Page Table with a matching MSID, the mobile station first applies a uniformly distributed random delay, which depends on the PDCH channel regime (e.g., full-regime PDCH), with a granularity of 1 TDMA block before searching BRI = Inactive. If a mobile station attempts random access for any other reason and the communication system has enabled some form of access overload control, the mobile station first applies a uniformly distributed random delay with a granularity of 1 TDMA block before searching for BRI. = Inactive. A mobile station then searches for a BRI = Inactive in all FPDCH ranges of its current PDCH that it decides to read according to its bandwidth preference. After failing to read BRI = Inactive during any given access attempt, a mobile station determines whether or not its current access attempt continues based on Occupied / Reserved Max. If the mobile station continues its current access attempt, it applies a uniformly distributed random delay with a granularity of 1 TDMA block before looking again for the BRI = Inactive. When finding an interval of FPDCH with BRI = Inactive, a mobile station sends the first burst of its access attempt using the corresponding sub-channel of PRACH. The mobile station then reads the PCF corresponding to its first transmitted burst and responds to the received PE value in the following manner. If a PE match does not occur, the mobile station considers the access attempt as having failed, increments a retest counter and then determines whether or not to make another access attempt based on the Max Retests. If a PE match occurs and there are no more bursts to send, the mobile station proceeds according to Table 3. If a PE match occurs and there are no more bursts to send, the mobile station proceeds according to Table 4.

TABLE 3- RANDOM ACCESS - NO MORE BURST BRI R / N PEQ Mobile Station Response _% _.

X R X Declares a successful access and supports the Inactive state.

X N X Declares a failure of the access attempt and then increments the retry test counter Rtr_ctr to determine whether or not to declare an access failure QUARTER 4 - RANDOM ACCESS - MORE BURST BRI R / N PEQ Mobile Station Response BR RSVD Declares an access attempt failure and then increments the retry counter 2 Rtr_ctr test to determine whether or not an access fault is declared BR INT_1 Renunciation of the property of the PRACH subchannel corresponding to the current PCF, increments the counter of burst_ctr burst, set the repetition counter Rep_ctr = 0 and stop the stop count Stop_ctr = 0, admit the state of More Burst and invoke the More Burst procedure.

B NO_INT Holds the property of the PRACH sub-channel that corresponds to the current PCI, programs the next burst transmission, increases Burst_ctr, graduates Rep_ctr = 0 and Stop_ctr = 0, supports the More Bursts state and invokes the More Bursts pro- cedure. .

B N X Declares a failure of the access attempt and then increments Rtr_ctr to determine whether or not to declare an access failure. R, IXX Declares an access attempt failure and then increments the Rtr_ctr to determine whether or not to declare an access failure When a reservation-based access is requested, the specific FPDCH interval selected by the communication system to send the access CPE and BRI information is completely independent of which PRACH subchannel the mobile station has previously used. A mobile station in the state of Starting Reserved Access as a result of receiving a frame from START ARQ Mode or CONTINUE ARQ Mode with Pl = 1, ARM = 1, at the beginning with the FPDCH interval where it received the frame of ARQ, starts looking for the FPDCH intervals of all PRACH subchannels in an effort to find a matching PE. A mobile station in this state as a result of responding to SRM = 1 will immediately begin to look for FPDCH intervals on all PRACH subchannels in an effort to find a matching PE. In any case, the mobile station will then start as follows. If the mobile station does not find a matching PE together with BRI = Reserved within 8 blocks of TDMA when it comes to sending a CURRENT ARQ STATUS box on a standby basis, the mobile station supports the status of Start Random Access and invokes the Start Random Access procedure. If the mobile station does not find a matching PE together with BRI = Reserved within 32 TDMA blocks when it tries to start sending a layer 3 message on a standby basis, the mobile station supports the Start Random Access state and invokes the Start Random Access procedure. If the mobile station finds a matching PE together with BRI = Reserved within the expected time frame, the mobile station sends the first burst of its access attempt (if an access attempt begins) or the next burst of its access attempt ( if it resumes an interrupted access attempt), using the next event of the PRACH subchannel that corresponds to the FPDCH interval where the coincident PE and the BRI = Reserved were detected. The mobile station then reads the PCF corresponding to its first transmitted burst. If there are no more bursts to send, the mobile station proceeds according to Table 5 based on the specific PCF information. If there are no more bursts to send, the mobile station proceeds according to Table 6 based on the specific PCF information.

TABLE 5 - RESERVED ACCESS - NO MORE BURST BRI R / N PEQ Mobile Station Response X R X Declares an access success and supports the Inactive state B N X Increments Rep_ctr and determines whether or not to continue the current access attempt based on Max Replications If Rep_ctr < Repetitions Max, the mobile station will maintain the property of the PRACH subchannel corresponding to the current PCF, re-program the transmission of its current burst accordingly and graduate Stop_ctr = 0. Yes Rep_ctr > Repetitions Max, the mobile station declares an access attempt failure and increases Rtr_ctr to determine whether or not to declare an access failure.

R, I N X Declares an access attempt failure and then increments Rtr_ctr to determine whether or not to declare an access failure.

TABLE 6 - RESERVED ACCESS - MORE BURST BRI R / N PEQ Mobile Station Response B R X Maintains the property of the PRACH subchannel corresponding to the current PCF, programs the transmission of its next burst correspondingly, increases Burst_ctr, graduates Rep_ctr = 0 and Stop_ctr = 0, supports the status of More Bursts and invokes the More Bursts procedure.

R R INT_2 Waives the PRACH subchannel property that corresponds to the current PCF, increases Burst_ctr, supports the More Bursts state, and invokes the More Bursts procedure.

R R RSVD Declares an access attempt failure INT_1 and increments Rtr_ctr to determine whether or not to declare an access failure NO INT B B X Increments Rep_ctr and determines whether or not to continue the current access attempt based on the Max Reps. If Rep_ctr < Repetitions Max, the mobile station will maintain the property of the PRACH subchannel corresponding to the current PCF, reprogram the transmission of its current burst correspondingly, graduate Stop_ctr = 0, admit the state of More Bursts and invoke the procedure of More Bursts. If Rep_ctr. Repetitions Max, the mobile station declares an access attempt failure and increases Rtr_ctr to determine whether or not to declare the access failure.

R N INT_2 Increments Rep_ctr and determines whether or not the current access attempt continues based on the Max Reps. If Rep-ctr < Reptitions Max, the mobile station will relinquish the PRACH subchannel property corresponding to the current PCF, graduate Stop ctr = 0, admit the More Bursts state and invoke the More Bursts procedure. Yes Rep_ctr > Repetitions Max the mobile station declares an access attempt failure and increases Rtr_ctr to determine whether or not to declare an access failure.

R N RSVD Declares an access attempt failure INT_1 and increments Rtr_ctr to determine whether or not to declare an access failure. NO INT I X X Declares an access failure attempt and increments Rtr_ctr to determine whether or not to declare an access failure After transmitting the first burst of its access attempt and responding to its associated PCF according to Table 4 or Table 6, and no further bursts need to be sent, the mobile station supports a "More Bursts" mode in the procedure of More bursts, a mobile station begins to examine the FPDCH intervals for all PRACH subchannels in the PDCH and is able to operate on them. The mobile station begins to examine the PCF of these additional FPDCH slots immediately after reading the range of FPDCH that contains the PCF corresponding to its first transmitted burst. The mobile station responds to the PCT information in these additional FPDCH ranges in the following manner: By reading an FPDCH interval for a currently associated PRACH sub-channel carrying the PCF information for a previously transmitted burst, a mobile station responds as is indicated in Table 7, based on the specific PCF information. When reading an interval of FPDCH for a PRACH subchannel not currently assigned, a mobile station responds as indicated in Table 8 based on the specific PCF information. A mobile station has one or more bursts that require transmission and that currently do not have assigned PRACH subchannels, considers its current access attempt as having failed if it does not receive an assignment of the PRACH sub-channel within 32 TDMA blocks of the PCF exam.

TABLE 7 - MORE BURSTAS - PCT FOR ASSIGNED SUBCANAL BRI R / N PEQ Mobile Station Response B R X Increase Burst_ctr and send the next burst of your current access attempt using the PRACH sub-channel that corresponds to your current PCF. When sending the last burst of your access attempt, a mobile station supports the status of After the Last Burst and invokes the After the Last Burst procedure.

R R INT2 Increase Burst_ctr and consider the PRACH subchannel that corresponds to your current unassigned PCF.

R R RSVD Increases Stop_ctr and Rep_ctr, and then INTi determines whether or not its current access attempt 0 continues on the basis of the Max Stop Stored I / O. If the mobile station continues its access attempt, it resends its current burst using the PRACH sub-channel corresponding to the current PCF. Otherwise, the mobile station increases PRACH and considers that its access attempt has failed. 1 R RSVD Burst_ctr increment and considers the PRACH sub-channel corresponding to its current unassigned PCF.

I R INTi Increment Stop_ctr and Rep_ctr, and then INT2 determines whether or not to continue its current attempt or access based on the NO_INT Max Detention Counter. If the mobile station continues its current access attempt, it resends its current ramp using the RPDCH sub-channel corresponding to the current PCF. Otherwise, the mobile station increases the Rtr_ctr and considers that its access attempt has failed.

B N X Increase Rep-ctr and determine whether or not to continue your current access attempt based on the Max Reps. If the mobile station continues its current access attempt, it resends its current burst using the PRACH sub-channel corresponding to its current PCF. Otherwise, the mobile station increases Rtr_ctr and considers that its access attempt has failed.

R N INT2 Consider the PRACH subchannel that corresponds to your current unassigned PCF R N RSVD, Stop_ctr increment and Rep__ctr, and INT] _ then determines whether or not they continue their current access attempt based on NO_INT the Max Stop Counter. If the mobile station continues its current access attempt, it resends its current burst using the PRACH sub-channel corresponding to its current PCF, otherwise the mobile station increments Rtr_ctr and considers that its access attempt has failed.

N RSVD Consider the PRACH subchannel that corresponds to your PCF as unallocated, I N INT] _ Increase Stop_ctr and Rep_ctr, and then INT2 determines whether or not to continue the current access or attempt based on the Max_Detention_NO_INT. If the mobile station continues its current access attempt, it resends its current burst using the RPDCH sub-channel that corresponds to its current PCF. Otherwise, the mobile station increases the Rtr_ctr and considers that its access attempt has failed.

TABLE 8 - MORE BUTTONS - PCF FOR UNCHANGED SUBCANAL BRI R / N PEQ Mobile Station Response B X INT} If the mobile station receives these PCF values in the first FPDCH interval (master or subaltern) after the FPDCH interval used to carry the PCF for the first burst of its current access attempt, the mobile station considers the associated PRACH sub-channel as assigned to it. The mobile station then increments Burst_ctr and sends the next burst of its access attempt using this subchannel PRACH. When sending the last burst of your access attempt, a mobile station supports the status of After the Last Burst and invokes the After the Last Burst procedure.

B and RSVD Ignore the current FPDCH interval. INT2 or NO_INT R x INT A mobile station reads the PE also received in the current FPDCH interval. If a coincident PE does not occur, the mobile station ignores the current FPDCH interval. If a coincident PE does not occur, the mobile station considers the PRACH sub-channel associated with the current PCF assigned to it, increases Burst ctr and sends the next burst to its access attempt using this PRACH sub-channel. When you send the last burst of your access attempt, a mobile station supports the status of After the Last Burst and invokes the procedure of After the Last Burst.

R X RSVD Ignores the current FPDCH interval INT or NO_INT I X X Ignores the current FPDCH interval.

After sending or resending the last burst of its access attempt, a mobile station expects the PCF feedback for its outstanding burst transmissions on all subchannels PRACH is currently considered as assigned to it. Upon receiving the PCF feedback in any of its assigned subchannels, the mobile station responds in accordance with Table 9.

TABLE 9 - AFTER THE LAST BURST - PCF FOR ASSIGNED SUBCANAL BRI R / N PEQ Mobile Station Response X If all the outstanding burst transmission has been confirmed as received in accordance with the PCF feedback, the mobile station considers its current access attempt as having successfully completed and immediately begins looking for an answer for its access in the PARCH. Otherwise, the station remains in the state of After the Last Burst.

B N X Increments Rep__ctr and determines whether or not to continue your current access attempt based on the Max Reps. If the mobile station continues its current access attempt, it resends its current burst using the PRACH sub-channel corresponding to the current PCF. Otherwise, the mobile station increases Rtr_ctr and considers that its access attempt has failed.

R N INT2 Considers the PRACH subchannel that corresponds to your current PCF as unallocated, supports the status of More Bursts, and invokes the More Bursts procedure.

R N RSVD Increase Stop_ctr and Rep_ctr, and then INT] _ determines whether or not to continue your current access attempt OR based on the Conta¬ DO NOT INTENT Detention Max. If the mobile station continues its current access attempt, it resends its current burst using the PRACH sub-channel that corresponds to its current PCF. Otherwise, the mobile station increases the Rtr_ctr and considers that its access attempt has failed.

N RSVD Consider the PRACH subchannel that corresponds to your current PCF as unallocated, supports the More Bursts state, and invokes the More Bursts procedure.

I N INTi Incremanta Stop_ctr, and Rep_ctr, and lue- INT2 go determines whether or not to continue its current access attempt based on NO_INT the Max Detention Counter. If the mobile station continues its current access attempt, it resends its current burst using the PRACH sub-channel that corresponds to its current PCF. Otherwise, the mobile station increases Rtr_ctr and is considered as having failed its access attempt.

If a mobile station considers resending the last burst of its current access attempt, the mobile station immediately begins to look for its expected PARCH response beginning with the next FPDCH interval, i.e., the FPDCH interval after the FPDCH interval. from which you read the PCF information that resulted in your decision to resend the last burst. If the mobile station receives the expected PARCH response before successfully resending its last burst, the mobile station considers the access attempt as having successfully completed. A mobile station that considers its attempt its access attempt as having failed, after attempting to resend to the last burst) immediately stops searching for its expected PARCH response. In a full-regime PDCH, the burst of PRACH and the FPDCH intervals are multiplexed in order to create three different access paths as illustrated in Figure 10. Assuming that path 1 (Pl) in FPDCH indicates that the next burst of Pl in PRACH is available, ie inactive , and is selected for access attempt, a mobile station sends the first burst of its access during that time (after receiving the full PI interval in the FPDCH). The mobile station then begins reading the PCF flags in the next Pl FPDCH interval after completing the transmission of its access burst to determine whether or not the communication system received the initial burst from the mobile station. Figure 11 illustrates the relationship between FPDCH PCF flags and PRACH bursts, where a mobile station performs a containment base access and transmits a total of two bursts. The arrows show the order or events associated with the access attempt. From this mañerea after the arrows from left to right in the PRACH subchannel Pl, the BRI portion of the PCF flag first indicates the availability of the next Pl burst in the PRACH. If a burst is transmitted in the PRACH burst, then the mobile station reads the R / N portion of the PCF flags in the next FP FPCH interval, to determine whether the communication system successfully received the burst transmitted from the PLC. mobile station. For the first burst of a random access, the mobile station also reads the PE portion of the PCF flags to determine if the specific access of the mobile station was captured. The communication system graduates the value of the PE flag and reflects the captured access of the mobile station, for example, the value of the PE flag can be graduated to reflect the least significant bits in the identification of the mobile station. If the mobile station determines that its access was captured based on the PE flag and the R / N flag indicates that the burst was received, the mobile station proceeds to send any additional bursts it has pending beginning with the next burst of Pl in the PRACH. As noted above, the PCF flags provide information to a mobile station with respect to when the mobile station is allowed to transmit, when the mobile station is requested to transmit, the current state of the communication, of a previously transmitted burst, and the partial echo association. Since the PDCH channel can be a multiple rate channel (full rate, dual rate and triple rate), many mobile stations can be operating in the channel using different rates. The operation of PCF is the same for all mobile transmission regimes. Therefore, the multiple-regime PDCH is not divided into dedicated bandwidth for full-regime, dual-regime, and triple-regime transmissions. Figures 12 to 14 provide several graphic illustrations of the functionality of the PEQ flag. It will be apparent to a person skilled in the art that these illustrations are examples of this invention and that this invention is not limited to just these illustrations. In Figures 12 to 14, a PEQ marker is used to illustrate the association or non-association of the PE flag with the BRI flag, and / or the R / N flag as determined by the PEQ flag. Then, the Occupied conditions are defined as 1) Occupied after random access, and 2) "Continuous Occupied". In the Occupied state after the random access case where the first random access burst has been successfully received, the communication system indicates that the BRI flag is graduated to Busy, the R / N flag is graduated as received and the PEQ flag indicates PE associated with both R / N and BRI. In addition, the next uplink interval in the same access path is reserved for the mobile station to send the second burst. In the Occupied Continuous condition, the BRI flag is graduated to Employed with PE association (PEQ = NO_INT) in order to allow a mobile station to send additional bursts on the same access path in which an indication of Busy was received. for the first burst of your access attempt. An Occupied Continuous condition can also occur as a result of a successful transmission of an intermediate burst where BRI graduates to Busy and R / N = Received. The PE association is not required in this case since the Occupied Continuous condition implicitly refers to the mobile station that received the indication of Occupied first, after a random access in this interval. Figure 12 illustrates an example of communications from a mobile station in a full-regime PDCH. At time n, downlink, the mobile MSI station detects an inactivated condition where the BRI flag is graded to inactivated. During a downlink time n + 1, the base station sets the channel to inactivated and none of the mobile stations are in the process of acquiring the channel. During the uplink n + 1 time, the mobile MSI station sends its first burst Dl] _. At the downlink n + 2 time, the base station sets the channel to inactivated. During the downlink n + 3 time, the base station having received the first burst Dl] _ correctly, determines by a length indicator within the burst that the full data transfer comprises four bursts. As a result, the base station graduates the flag from BRI to occupied and the flag from N / R as received. In addition, the base station graduates the PEQ flag to 1.1 so that PE is associated with the R / N and BRI flags. At the uplink n + 4 time, the condition that continues to be occupied is detected by the mobile station MSI. The mobile station MSI then begins to examine the FPDCH intervals for all the sub-channels of the RPDCH that the mobile station is capable of operating and sends its remaining bursts DI2, DI3 and DI4 in the intervals having BRI = occupied. During the n + 4 and n + 5 downlink time, the base station indicates that the channel is busy. During the time n + 6 of the falling interval, the base station indicates that the burst DI2 has been received. No association of PE is required since the interval was reserved for the mobile station MSI. During the time n + 7 of the downlink, the base station indicates that the burst DI3 has been received, and again PE association is not needed since the interval was reserved for the mobile station MSI. Finally, during the downlink n + 8 time, the base station indicates that the burst DI4 has been received again, no association of PE is needed since the interval was reserved for the mobile station MSI. Therefore, all four bursts have been successfully received by the base station. Figure 13 illustrates an example of three mobile stations communicating in a full-regime PDCH. During the downlink n time, the base station sends a first burst D3 to a third mobile station MS3. In addition, a first mobile station MSI detects an inactive condition while during the downlink time n + 1, a second mobile station MS2 detects the inactive condition. In addition, during the downlink n + 1 time, the base station sends a second burst D32 to the third mobile station MS3. During the uplink n + 1 time, the first mobile station MSI sends its first burst Dl ^ to the base station. During the downlink n + 2 time, the base station sends a third burst in the third mobile station MS3 and sets the channel to inactive. During the downlink n + 3 time the base station sends a fourth burst to the third mobile station MSI. In addition, the base station having received the first burst correctly from MSI determines by the length indicator within the burst that the complete transfer comprises four bursts. As a result, the base station responds by graduating the flag from BRI to busy and the flag received / not received to received. In addition, the base station graduates the PEQ 1.1 flag indicating that the PE association is both with both the BRI and R / N flags. During the n + 2 time of the uplink, the second mobile station MS2 sends its first burst of D2] _. During the time m + 4 of the downlink, the base station sends a fifth burst in the third mobile station in MS3. In addition, the base station places the second mobile station MS2 in a hold state by graduating the R / N flag as received, the PE flag is graduated to the assigned PE of the second mobile station, and the BRI flag is graded as busy In addition, the PEQ flag is graduated to 0, 1 indicating that PE is associated with the R / N flag. This PCF gradation also indicates that the first mobile station MSI must transmit. During times n + 4, n + 5 and n + 6 of the uplink, the busy continuous condition is detected by the first mobile station. As a result, the mobile station sends its remaining bursts Dl, DI3 and DI4 in the intervals that have the flag of BRI graduated to occupied. During the downlink n + 5 time, the base station indicating BRI = occupied for the last burst DI4 from MSI. During the downlink time n + 6, the base station indicates that the burst Dl was not received by grading the R / N flag to not received. No association of PE is needed since the interval was reserved for the first mobile station. In addition, the base station reserves an interval by sending the BRI flag for reservation for a third mobile station MS3 so as to recognize a forward link transfer of the bursts D3] _, D32, ... D33. During the time n + 7 of the downlink, the base station indicates that the burst DI3 was received by graduating the R / N flag as received. In addition, the base station reserves an interval by graduating the BRI flag to reserved for the second mobile station MS2 in order to send its next burst. During the downlink n + 8 time, the base station indicates that the burst DI4 was received by grading the received R / N flag. In addition, the continuous transfer from the second mobile station is interrupted by grading the reserved BRI flag and PE to the PEA of the first mobile station to allow the first mobile station to retransmit the unseen, received DI2 burst. During the n + 7 time of the uplink, the third mobile station MS3 sends a burst as a result of a reserved access request during time m + 6 of the downlink. During the downlink n + 9 time, the base station initiates the continuous transfer from the second mobile station MS2 by graduating the BRI flag to reserved, PEQ flag to 1.0, to indicate that PE is associated with the BRI flag and that PE is graduated to PEA from the second mobile station. The base station also indicates the correct reception of the bursts transmitted by the third mobile station MS3 by graduating the received R / N flag. A matching PE is not required since it was reserved and is not a random access. During the uplink n + 8 time in the second mobile station MS2 sends its second burst D22- During the uplink time n + 9 the first mobile station sends again its second burst DI2. Finally, during the uplink n + 10 time, the second mobile station sends its third burst D23. Figure 14 illustrates an example of a mobile station communicating in a triple-rate PDCH. In this example, the base station grants access to the channel by scaling the current channel status to BRI = reserved. During the time n of the previous link, the mobile station MSI detects an inactive condition. During the downlink n + 1 time, the base station sets the channel to inactive. During the uplink n + 1 time, the mobile station MSI sends its first burst D ^. During the uplink n + 3 time for interval 1, the base station having received the first burst correctly determines through a length indicator within the burst, that the complete transfer unit comprises four bursts. In response, the base station graduates the flag from BRI to occupied and the flag from R / N to received. In addition, the PEQ flag is graduated to 1.1 indicating that PE is associated with both BRI and R / N. At intervals 2 and 3 of time, the base station graduates the channel to BRI = reserved and PEQ to 1.0 indicating that PE is associated with the BRI flag. During the uplink n + 4 time, the mobile station MSI sends the remaining bursts DI2, DI3 and DI4 in the intervals that have the BRI to reserved and PE equal to PEA. During the n + 6 downlink time in intervals 1-3, the base station indicates that DI2, DI3 and DI4 have been received by graduating the flag from R / N to R. In accordance with one embodiment of the present invention, a Random Packet Access Channel (PRACH) is divided into subchannels. Each subchannel adds a delay between the communications thus allowing sufficient processing time in both the mobile station and the base station together with a random access event. As a result, the more sub-channels into which the longer PRACH is divided will be the delay. For the data package it is very important for the transmission to happen very quickly. As a result, the PDCH has been defined as consisting of three PRACH sub-channels as opposed to six DCCH sub-channels according to IS-136. The PCF flags are carried in the FDCCH time slots and serve to indicate the current state of reception of the bursts previously sent in RDCCH. PCF flags are also used to indicate the current status of availability (ie, Busy / Reserved / Inactive) of their corresponding RDCCH bursts. A mobile station that has a pending access reads one of the PCF flags to determine when its access attempt begins. If a full-regime PDCH exists, then its RDCCH bursts and FDCCH intervals are multiplexed to create 3 different access paths as shown in Figure 10. Assuming path 1 (Pl) in FDCCH indicates that the next burst of Pl in RDCCH is available (ie Inactive) and selected for access attempt, a mobile station will start sending the first burst of its access during that time (24.8 milliseconds) after receiving the full Pl interval in the FDCCH ). The mobile station will then be reading the PCF flags in the next FDCCH range of Pl (21.8 milliseconds) after completing the transmission of its access burst) to determine the current BMI reception status of its initial access burst. In contrast to Figure 10, Figure 15 illustrates the sub-channels used by full-scale DCCH in accordance with IS-136. As will be evident when comparing Figures 10 and 15, double the time in IS-136 is required to transmit the 3 bursts represented by the arrows. Similar advantages are obtained for double-regime and triple-regime PDCHs. It should be noted that the PCF information carried by any given FDCCH interval is completely independent of the layer 3 information carried therein since the PCF flags completely occupy the bandwidth separated from that allocated for PBCCH purposes, PPCH or PARCH. Figure 11 shows the relationship between FDCCH PCF flags and RDCCH bursts. The arrows show the order of associated events in an access attempt. In this way after the arrows from left to right in the PRACH subchannel Pl, the BRI portion of the PCF flags first indicates the availability of the next burst Pl in the RDCCH. If a burst is transmitted in that burst of RDCCH, then the mobile station reads the R / N portion of the SCF flags in the next FDCCH interval of MBl to determine the current state of BMI reception of its burst transmitted. For the case of the first burst of a random access, the mobile station also reads the PE portion of the PCF flags to determine whether or not the specific access was captured. BMI graduates the PE value to reflect the access of the captured mobile station. If the mobile station determines that its access was captured based on PE and that the R / N flag indicates as having been received, it proceeds to send any additional bursts it has pending starting with the next burst of Pl in RDCCH. It will be appreciated by those skilled in the art that the present invention may be encompassed in other specific forms without deviating from the spirit or essential character thereof. The modalities disclosed at present are therefore considered in all respects as being illustrative and not restrictive. The scope of the invention is indicated by the appended claims instead of the foregoing description and all changes that fall within the meaning and scale of equivalencies thereof are indicated as being covered herein.

Claims (14)

CLAIMS;

1. A method for transmitting information through a channel in a communication system, comprising the steps of: granting access of the channel to a first communication device, in such a way that the first communication device transmits the information in the channel; interrupting the transmission of the first communication device during a period of interruption in response to a control message of the communication system; considers channel access to a second communication device in such a way that the second communication device transmits the information during the interruption period.

2. The method of claim 1, wherein the channel is a packet data channel.

3. The method of claim 2, wherein the control message is contained in the packet channel feedback information.

4. The method of claim 3, wherein the message is contained in a partial echo qualifier field within the packet channel feedback information.

5. The method of claim 1, wherein the communication system is a mobile communication system and the first and second communication devices are mobile terminals.

The method of claim 2, wherein the packet data channel is a full rate packet data channel subdivided into a plurality of subchannels, each subchannel causing a corresponding delay period to occur between the transmissions of the packet. information.

The method of claim 6, wherein the full rate packet data channel is subdivided into three subchannels.

A method for temporarily interrupting the transmission of a communication device in a communication system, comprising the steps of: inserting the control information into a control message generated by the system, transmitting the control message to the communication system; and interrupting the transmission of the communication device in response to receipt of the control information.

The method of claim 8, wherein a second communication device transmits a message while the first communication device is interrupted.

10. The method of claim 7, wherein the control information is a flag in a packet channel feedback field and the control message is transmitted through a packet data channel. The method of claim 10, wherein the flag is a partial echo qualifying flag. The method of claim 8, wherein the communication system, and the first and second communication devices are mobile terminals. The method of claim 10, wherein the packet data channel is a full-rate packet data channel and subdivided into a plurality of sub-channels, each sub-channel causing a corresponding delay period between the transmission of the data to occur. information. The method of claim 13, wherein the full rate packet data channel is subdivided into three channels.