MXPA98003045A - Control of register of mobile stations in a communication system inalambr - Google Patents

Abstract

The present invention relates to a method and a device for storing and maintaining parameters associated with activities that relate to a first channel while a mobile station is in a second channel or employs a second channel. More specifically, when a parameter indicates that activities must be executed, the mobile station returns to the first channel to perform the actions associated with the parameter. For example, parameters associated with a DCCH may be stored when the mobile station moves from the DCCH to a packet data channel (PDCH). When a parameter indicates that activities must be executed, the mobile station can then return to the DCCH from the PDCH and execute the actions associated with the parameter. Since the mobile station returns to the DCCH for the actions instead of staying in the PDCH, the mobile station is activated from the system perspective, in both channels

Description

CONTROL OF REGISTER OF MOBILE STATIONS IN A WIRELESS COMMUNICATION SYSTEM BACKGROUND OF THE INVENTION The invention of the applicants refers to electrical telecommunication, and more particularly to wireless communication systems such as, for example, cellular and satellite radio systems, for several modes of operation (analog, digital, dual mode, etc.) and access techniques such as multiple frequency division access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA) , and hybrid FDMA / TDMA / CDMA. The specific aspects of this invention focus on techniques to improve procedures for receiving and transmitting information. Follow a description focused on environments in which this invention can be applied. This general description is intended to provide a general presentation of known systems and the associated terminology in such a way that a better understanding of the invention can be obtained. In North America, digital access and multiple access techniques such as TDMA are currently provided by a digital cellular telephony system called the advanced digital mobile telephony service (D-AMPS). Some of its characteristics are specified in the interim standard TIA / EIA / IS-54-B, "Dual-Mode Mobile Station-Base Station Copad ibi 1 i ty and Standard" (Standard for Mobile Station Compliant-Base Station) of Mobile Mode), published by the Telecommunications Industry Associations and the Electronic Industry Association (TIA / ESA). The TIA / EIA / IS-54-B standard is incorporated by reference in this application. Due to a large existing consumer base operating only in the analog domain with sequence division multiple access (FDMA), TIA / EIA / IS-54-B is a dual mode (analogue and digital) standard that provides analog compatibility along with digital communication capability. For example, the TIA / EIA / IS-54-B standard provides both analog voice channels (AVC) of FDMA and digital traffic (DTC) channels of TDMA. AVCs and DTCs are supplemented by radio frequency modulation carrier signals that have frequencies close to 800 megahertz (MHz) in such a way that each radio channel has a spectrum width of 30 kilohertz (KHz).

In a TDMA cellular radiotelephone system, each radio channel is divided into a series of time slots, each of which contains a sudden increase in information from a data source, for example, a digitally coded portion of a voice conversation. The time segments are grouped into successive TDMA frames that have a predetermined duration. The number of time slots in each TDMA frame is related to the number of different users that can simultaneously share the radio channel. If each segment in a TDMA frame is assigned a different user, the duration of a TDMA frame is the minimum amount of time between two successive time segments assigned to the same user. The successive time segments assigned to the same user, which are usually not consecutive segments of time in the radio carrier, constitute the digital traffic channel of the user, which can be considered as a logical channel assigned to the user. In accordance with what is described in more detail below, digital control channels (DCCHs) can also be provided to communicate control signals and such DCCH is a logical channel formed by a succession of usually non-consecutive time segments in the radio carrier . In only one of the many possible modalities of a TDMA system as described above, the TIA-EIA-IS-54-B standard indicated that each TDMA frame consists of six consecutive segments of time and has a hard ion of 40 milliseconds ( msec). A) Yes, each radio channel can carry from 3 to or DTCs (for example, from 3 to 6 telephone conversations), according to the source speeds of the voice codecs / decoders used to digitally code the conversations. Such voice coders / decoders can operate either at full speed or at half speed. Full-speed DTC requires twice as many time segments in a given period of time as a medium-speed DTC, and in TIA / EIA / IS-54-B, each full-speed DTC uses two segments of each TDMA frame of Full speed uses two segments of each TDMA frame, that is, the first and fourth, the second and the fifth or the third and the sixth of the six segments of a TDMA frame. Each half-speed DTC uses a time segment of each TDMA frame. During each DTC time segment, 324 bits are transmitted, of which most, 2/0 bits, are due to the decoder encoder's speech output, including bits due to output error correction coding. of voice, and the remaining bits are used for security times and general signaling for purposes such as synchronization. It can be seen that the TDMA similar system operates in a discontinuous transmission mode or a separator and sudden increments mode: each mobile station transmits (and receives) only during its assigned time segments. At full speed, for example, a mobile station can transmit during segment one, receive during segment two, be at rest during segment 3, transmit during segment 4, receive during segment 5, and be at rest during the segment 6, and then repeat the cycle during the subsequent TDMA frames. Accordingly, the mobile station, which can be activated by means of a battery, can be disconnected, to save energy during the time segments when they are not receiving or transmitting. In addition to voice or traffic channels, cellular radio communication systems also provide paging / access channels, or control, to carry call setting messages between base stations and mobile stations. In accordance with TIA / EIA / IS-54-B, for example, there are 21 dedicated analog control channels (ACCß), which have predetermined fixed frequencies for transmission and reception located near 800 MHz. Since these ACCs are always in The same frequencies can be easily located and monitored by mobile stations. For example, when it is in a quiescent state (ie, connected but not making or receiving a call), a mobile station in a TIA / EIA / IS-54-B system is tuned to the strongest control channel and then regularly monitors said channel (generally, the control channel of the cell in which the mobile station is located at this time), and may receive or initiate a call through the corresponding base station. When moving between cells while in idle state, the mobile station will eventually "lose" the radio connection in the control channel of the "old" cell and will tune to the control channel of the "new" cell. The initial tuning and subsequent retune to control channels are both achieved automatically by scanning all available control channels at their known 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, mobile stations remain "in contact" with the system. While in the idle state, a mobile station must monitor the control channel to voice messages addressed to it. For example, when an ordinary telephone subscriber (landline) calls a mobile subscriber, the call is directed from the public switching telephony network (PSTN) to a mobile switching center (MSC) that analyzes the dialed number. If the dialed number is validated, the MSC requires part or all or part of the radio base stations to call the mobile station called by transmitting in its respective control channels paging messages containing the mobile identification number (MIN). ) of the mobile station called. Each mobile station in idle state that receives a paging message compares the received MIN with its own stored MIN. The mobile station with the corresponding stored MIN transmits a paging response in the particular control channel to the base station, which sends the paging response to the MSC. Upon receiving the paging response, the MSC selects an AVC or an available DTC to the base station that received the paging response, switches to a corresponding radio receiver in this base station, and causes the base station to send a message via the control channel to the called mobile station that instructs the called mobile station to tune to the selected voice or traffic channel. A connection is established for the call once the mobile station has tuned to the AVC or selected DTC. The performance of the system that has ACCs specified by TIA / EIA / IS-136-B has been improved in a system that has digital control channels (DCCHs) specified in TIA / EIA / IS-136. Using such DTCHs, each TIA / EIA / IS-54-B radio channel can carry only DTCs, only DCCHs, or a mixture of DTCs and DCCHs. Within the framework of TIA / EIA / IS-136-B, each radio carrier frequency can have up to 3 full-speed DTCs / DCCHs or six medium-speed DTCs / DCCHs, or any combination of these two options, example, one DTCs / DCCHs of total speed and 4 DTCs / DCCs of half speed. In general, however, the DCCH transmission speed does not need to match the average speed and full speed specified in TIA / EIA / IS-54-B, and the length of the DCCH segments may not be uniform and may not match the length of the DTC segments. The DCCH can be defined in a TIA / EIA / IS-54-B radio channel and can consist, for example, of each n-th segment in the stream of consecutive TDMA segments. In this case, the length of each DCCH segment may or may not equal 6.67 sec, if this length of a DTC segment conforms to TIA / ESA / IS-54-B. Alternately (and without limitation as to other possible alternatives, these DCCH segments may be defined in other manner known to one skilled in the art.) In cellular telephone systems, an air link protocol is required for the purpose of allow a mobile station to communicate with base stations and MSCs The communications link protocol is used to initiate and receive cellular telephone calls The communication link protocol is commonly known within the communications industry as a protocol of Layer 2, and its functionality includes the delimitation, or framed of Layer 3 messages. These Layer 3 messages can be sent between Layer 3 equivalent communication entities that are located within mobile stations and cellular communication systems The physical layer (Layer 1) defines the parameters of the physical communication channel, for example, radiofrecue space ncia, modulation characteristics, etc. Layer 2 defines the techniques necessary for the accurate transmission of information within the limits of the physical channel, for example, correction and detection of err, and so on. Layer 3 defines the procedures for receiving and processing the information transmitted in the physical channel. Communications between mobile stations and the cellular switching system (the base stations and the MSC) can be described, in general, with reference to Figs. 1 2. Fig. 1 illustrates schematically several Layer 3 messages 11, Layer 2 frames 13 and channel increments, or time slots, 15, of Layer 1. In Figure 1, each group of channel increments corresponding to each Layer 3 message can constitute a logical channel, and, as described above, the channel increments for a given channel 3 message would not normally be consecutive segments. on a TIA / EIA / 136 carrier. On the other hand, the sudden increases of channel could be consecutive; As soon as a segment ends, I could start the next segment. Each sudden increase of channel 15 of Layer 1 contains a complete Layer 2 chart as well as other information such as, for example, error correction information and other general information used for the Layer 1 operation. Each Layer 2 box contains at least a part of a Layer 3 message as well as general information used for Layer 2 operation. Although not indicated in Figure 1, each Layer 3 message could include several information elements that can be considered as the message load, a header part to identify the respective type of message, and possibly fill. Each sudden increase in Layer 1 and each Layer 2 frame is divided into a plurality of different fields. Particularly, a limited length DATA field in each Layer 2 frame contains the Layer 3 message 11. Since the Layer 3 messages have varying lengths depending on the amount of information contained in the Layer 3 message, several Layer 3 messages may be required. Layer 2 boxes for the transmission of a single Layer 3 message. As a result, a plurality of Layer 1 channel spikes may also be required to transmit the entire Layer 3 message as if there were a 1 to 1 correspondence between the channel spikes and the Layer 2 frames. As before observed, when more than one sudden channel increase is required to send a Layer 3 message, the various sudden increases are not usually sudden sudden increases in the radio channel. In addition, the various sudden increases are usually not even successive sudden increases dedicated to the particular logical channel used to carry the Layer 3 message. Since it takes time to receive, process and react to every sudden increase received, the sudden increases received for the transmission of a Layer 3 message 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 forward DCCH (or downlink) configured as a succession of time segments 1, 2,, N, .... included in the consecutive time segments 1, 2 , sent on a carrier frequency. These DCC segments can be defined in a radio channel as specified by TIA / EIA / IS-136, and may consist, as shown in Figure 2 (a), as for example, of each n-th segment in a series of consecutive segments. Each DCC segment has a duration that may or may not be 6.67 msec, which is the length of a DCC segment according to the TIA / EIA / IS-136 standard. As shown in Figure 2 (a) the DCCH segments can be organized in superframes (SF), and each superframe includes several logical channels carrying different types of information. One or several DCCH segments can be assigned to each logical channel in the superframe. The exemplary downlink superframe in Figure 2 (a) includes three logical channels: an emission control channel (BCCH) that includes six successive segments for general messages; a paging channel (PCH) that includes a segment for voicing messages; and an aspect response channel (ARCH) that includes a segment for channel assignment and other messages. The remaining time segments in the exemplary superframe of Figure 2 (a) can be indicated to other logical channels, such as for example additional paging channels PCH or other channels. Since the number of mobile stations is generally greater than the number of slots in the superframe, each paging segment is used to call several mobile stations that share some unique characteristics, for example, the last digit of the MIN. Figure 2 (b) illustrates a preferred information format for the segments of a forward DCCH. The information transferred in each segment comprises a plurality of fields, and Figure 2 (b) indicates the number of bits in each field above this field. The bits sent in the field SYNC are employed in a conventional manner to help ensure accurate reception of the encoded superframe (CSFP) and DATA phase fields. The SYNC field carries a predetermined bit pattern used by the base stations to find the beginning of the segment. The SCF field is used to control a random access channel (RACH), used by the mobile to request access to the system. The CSFP information evaluates a coded superframe phase value that allows mobile stations to find the start of each superframe. This is just an example of the information format in the outgoing DCCH slots. For purposes of efficient sleep mode operation and for rapid cell selection, the BCCH can be divided into several subchannels. A BCCH structure is known which allows the mobile station to read a minimum amount of information when activated (when it is set to a DCCH) before being able to access the system (send or receive a call). After activation, a mobile station at rest requires to regularly monitor only its assigned PCH segments (usually one in each superframe); the mobile can be at rest during the other segments. The ratio between the time that the mobile phone devotes to the reading of vocea messages and the time in which it is at rest can be controlled and represents a balance between delay to establish a call and energy consumption. Since each TDMA time segment has a certain fixed information transport capability, each sudden increment typically carries only a part of a Layer 3 message as previously observed. In the upward direction, several mobile stations attempt to communicate with the system in a containment base, while several mobile stations listen to Layer 3 messages sent from the system in the downlink direction. In known systems, any given Layer 3 messages must be carried using the number of TDMA channel increments required to send the entire Layer 3 message. Digital and traffic control channels are desirable for reasons, such as to support periods Longer resting times for mobile stations, resulting in a longer battery life. Digital traffic channels and digital control channels have expanded functionality to optimize system capacity and support hierarchical cellular structures, eß say, structures of macrocells, microcells, picocells, etc. The term "macrocell" generally refers to a cell having a size comparable to the sizes of cells in a conventional cellular telephone system (for example, a radius of at least approximately 1 km), and the terms "microcells" and "picocells" generally refer to progressively smaller cells. For example, a microcell may cover a deck or external public area, for example, a convention center or a busy street and a picocell may cover an office corridor or a floor of a tall building. From a radio coverage perspective, macrocells, microcells and picocells may be different from each other or may be spliced to manage several different environments or radios di fferent patterns. Figure 3 is a cellular, or multiple layer, exemplary hierarchical system. An iO macrocell of broad coverage represented by a hexagonal shape constitutes an overlapping cellular structure. Each wide coverage cell may contain an underlying microcell structure. The wide coverage cell IO includes a microcell 20 represented by the area enclosed within the dotted line and a microcell 30 represented by the area enclosed within a line of stripe corresponding to areas along streets of a city, and pico cells 40, 50, and 60, which cover individual floors of the building. The intersection of 2 streets of a city covered by the microcells 20 and 30 can be an area of intense concentration of traffic, and therefore can represent a high point. Figure 4 depicts a block diagram of an exemplary cellular mobile radio system, including a central base station 110 and a mobile station 120. The base station includes a control and processing unit 130 connected to the MSC 140 which at its once it is connected to the PSTN (not shown). General aspects of such cellular radiotelephone systems are known in the art, in accordance with that described in US Patent No. 5,175,867 to ejke et al., Entitled "Neighbor-Assisted Handoff in a Cellular Communication System". in a Cellular Communication System), which is incorporated herein by reference. The base station 110 handles several speech channels through a voice channel transceiver 150 controlled by the control unit 130. Likewise processing, each base station includes a Transfector control channel 160, which can handle more than a control channel. The Transfector control channel 160 is controlled by the control unit and processing 130. Transfector control channel 160 sends control information over control channel the base station or cell to mobiles linked to this channel of control. It will be understood that transfectors 150 and 160 may be implemented in the form of a single device, such as, for example, voice and control transfector 170, for use with DCCHs and DTCs that share the same radio bearer frequency. The mobile station 120 receives the information sent in a control channel in its transfeptar 170 of voice channel and control. Then, the processing unit 180 evaluates the information received control channel, which includes the characte istics cell candidates for the mobile station is engaged and determines which cell it should hooking mobile. Advantageously, the received control channel information does not only include absolute information regarding the cell with which it is related, but also relative information regarding other cells near the cell with which the control channel is associated, in accordance with that described in US Patent No. 5,353,332 to Raith et al., entitled "Method and Apparatus for Commmunication Control in Radiotelephone System" (Method and Apparatus for Control of Communication in a Radiotelephone System), which is incorporated in this application by reference. To increase the user's "talk time", i.e. the life of the mobile station battery, a digital outbound control channel (from base station to mobile station) can be provided which carries the message types specified for the current analogue outbound control channels (FOCCs), but in a format that allows a mobile station at rest to read general messages when it is hooked on the FOCC and then only when it has changed to information; the mobile is at rest in other times. In such a system, some types of messages are sent by the base stations more frequently than other types, and mobile stations do not require reading each sent message. The systems specified by the TIA / EIA / SS-54-B and TIA / EIA / IS-136 standards are circuit-switched technology, which is a type of "connection-oriented" communication that establishes a typical call connection and maintains this connection and all the time in which the final communication systems have data that they exchange. The direct connection of a circuit switch serves as an open line, allowing end systems to use the circuit when they deem appropriate. While data communication with switching of this type may be suitable for applications in constant bandwidth, it is relatively inefficient in the case of applications in low bandwidth and "with sudden increases".

The packet switched technology, which can be oriented by connection (for example, X.25) or "without connections" (for example, the Internet protocol, "IP") does not require the installation and removal of physical connection, which represents a remarkable contrast with the circuit switching technology. This reduces the latency of the data and increases the efficiency of a channel in the management of relatively short, incremental, or interacting transactions. An offline packet switched network distributes the route functions to various route sites, thus avoiding possible traffic bottlenecks that could occur when a switching center is used. The data is "packaged" with the appropriate address of the final system and then transmitted in separate units along the data path. Intermediate systems, sometimes called "track indicators" stationed between the final communication systems, make decisions as to the most appropriate route on a per-packet basis. Route decisions are based on several characteristics that include: the lowest cost route; link capacity; number of packages waiting for their transmission; security requirements for the link; and operating state of intermediate system (node). The transmission of packets along a route that takes into account symmetric track characteristics, as opposed to a single circuit arrangement offers flexibility of application and communication. It is also the way how most of the networks and standard local areas (LANs) and wide area networks (WANs) evolved in the corporate environment. Packet communication is appropriate for data communications due to the fact that many of the applications and devices used, such as keyboard terminals, are interactive and transmit data in sudden increments. Instead of a channel that is at rest while a user goes through more data in the terminal or pauses to reflect on a problem, packet switching interleaves several transmissions from several terminals in the channel. The packet data provides a greater network robustness due to the independence of via to the capacity of the via indicators to select alternative paths in case of a network node failure. The communication in packet, consequently allows a more efficient use of the network lines. Package technology offers the option to charge the end user based on the amount of data transmitted instead of the connection time. If the end-user application has been designed to make efficient use of the air link, then the number of transmitted packets will be minimal. If each individual user traffic is kept to a minimum, then the service provider will have effectively increased its network capacity. Packed networks are usually designed and are based on standards for data on an industrial scale such as the open system interface model (OSI) or the TCP / IP protocol. These standards have been developed, either formally or de facto, many years ago, and applications that employ these protocols are readily available. The main objective of standards-based networks is to achieve interconnection with other networks. The Internet is today the most obvious example of standards-based networks that seek to achieve this goal. Packet networks such as the Internet, or a corporate LAN, are integral parts of the current business and communication environment. As mobile computing systems become increasingly common in these environments, wireless service providers such as those using TIA / EIA / IS-136 are in a better position to provide access to these networks. However, the data services provided by the cellular systems or proposed by the cellular systems are generally based on the circuit-switched mode of operation, employing a dedicated radio channel for each active mobile user. Some exceptions to data services for '?' Systems? Cellular-based circuit-switched mode are described in the following documents that include the concepts of packaged data. U.S. Patent No. 4,887,265 and "Packet Switching in Digital Cellular Systems" (Miniature of the 38th Conference on Vehicular Technology of IEEE, p. 414-418 (June 1988) describes a similar system that provides shared packet radio channels, each capable of accommodating several data calls. A mobile station that requires packet data service is assigned to a particular packet data channel that employs an essentially regular cellular signaling. The system can include packet access points (PAPS) for interface with packet data networks. Each packet data radio channel is connected to a particular PAP and can therefore ultiplex the data call associated with this PAP. When the system initiates transfers to a large extent similar to the transfer used in the same system for voice calls. A new type of transfer is added for situations in which the capacity of a packet channel is insufficient. These documents are oriented to data call and are based on the use of system-initiated transfer in a manner similar to regular voice calls. The application of these principles to provide general-purpose packet data services in a TDMA cellular system will result in performance and spectrum efficiency disadvantages. U.S. Patent No. 4,916,691 discloses a new packet mode cellular radio system architecture and a new method for directing packets (voice and / or data) to a mobile station. Base stations, public switches through trunk interface units, and a cellular control unit are linked together through a WAN. The address procedure is based on transfers initiated by mobile stations and the addition to the header of any packet transmitted from a mobile station (during a call) of an identifier of the base station through which the packet passes, in In the case of an extended period of time between subsequent user information packets from a mobile station, the mobile station may transmit extra control packets for the purpose of carrying cell location information. The cellular control unit is primarily involved in the establishment of a call, when it assigns a call control number to the call. The mobile station then hosts the call control number and the trunk interface unit of the call control number and the identifier of the initial base station.

During a call, packets are then directed directly between the trunk interface unit and the current service base station. The system described in the North American patent No. 4,916,691 is not directly related to the specific problems of providing packet data services in TDMA cellular systems. "Packet Radio in GSM" (Radio package in GSM), European Telecommunications Standards Institute (ETSI) T Doc SMG 4 58/93 (February 12, 1993) and "A General Packet Radio Service Proposed for GSM "(A General Service of Radiopaquete Proposed for GSM), presented during a seminar entitled "GSM in a Future Competitive Env i ropment" (GSM in a Future Competitive Environment), Helsinki, Finland (October 13, 1993) present a possible protocol for accessing packets for voice and data in GSM. These documents are directly related to TDMA cellular systems, that is, GSM, and even when they present a possible organization of an optimized shared packet data channel, they do not deal with the aspects of the integration of packet data channels in a solution of total system. "Packet Data over GSM Network" (Network Package Data GSM), T Doc SMG 1 238/93, ETSI (September 28, 1993) describes a concept for providing data services of 15 GSM packets based on first using regular GSM authentication and signaling to establish a virtual channel between a mobile packet station and an "agent" that handles access to packet data services. With regular modified signage for fast channel tuning and release, regular transit channels are then used for packet transfer. This document is directly related to TDMA cellular systems, but since the concept is based on the use of a "fast switching" version of existing GSM traffic channels, it has disadvantages in terms of spectrum efficiency and packet transfer delays ( specifically in the case of short messages) compared to a concept based on optimized shared packet data channels. The digital cellular packet data system (CDPD) specification, version 1.0 (July 1993), describes a concept for offering packet data services that uses available radio channels in current advanced mobile telephone service systems (AMPS). ), that is, the similar North American analog system. The CDPD is an open, complete specification, supported by a group of North American cellular operators. Covered elements include external interfaces, air link interfaces, services, network architecture, network management and administration.

The CDPD system specified is largely based on an infrastructure independent of the existing AMPS infrastructure. The aspects in 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 to CDPD) and the use of a radio interface. signage to coordinate channel assignments between the two systems. The address of a packet to a mobile station is based, first, on the address of the packet to an initial network node (Initial Mobile Intermediate Data System, MD-IS) equipped with an initial loc ions logger ( HLR) based on the mobile station address; then, if necessary, addressing the packet to a visited service MD-IS based on HLR information; and finally the transfer of the package from the service MD-IS through the current base station, based on the mobile station reporting its cellular location to its service MD-IS. Even though, the CDPD System specification does not directly relate to the specific problems of providing packet data services in TDMA cellular systems to which this application is focused, the aspects and network concepts described in the System Specification CDPD can be used as a basis for the network aspects required for an air link protocol in accordance with this invention. The CDPD network is designed to be an extension of existing data communication networks and the AMPS cellular network. Network protocols without existing connections can be used to access the CDPD network. Since the network is always considered to be evolving, it uses an open network design that allows the addition of new network layer protocols if appropriate. The CDPD network services and protocols are limited to the network layer of the OSI model and below. Doing this allows the development of higher layer protocols and applications without changing the underlying CDPD network. From the mobile subscriber perspective, the CDPD network is a wireless mobile extension of traditional networks, both data and voice. Through the use of a CDPD service provider network service, the subscriber can access sutureless access data applications, many of which can be found in traditional data and networks. The CDPD system can be considered as two interrelated sets of services; CDPD network support services and CDPD network services. The CDPD network support services perform the tasks necessary to maintain and manage the CDPD network. These services are: accounting server; network management system; messaging server is; and authentication server. These services are defined to define the interoperability between service corridors. As the CDPD network evolves technically beyond its original AMPS infrastructure, it is anticipated that support services will remain unchanged. The functions of network support services are necessary for any mobile network and are independent of radio frequency (P.F) technology. CDPD network services are data transfer services that allow subscribers to communicate with data applications. Additionally, one or both ends of the data communications can (n) be mobile (s). To summarize, there is a need for a system that provides general purpose packet data services in D-AMPS cellular systems, based on providing shared packet data channels optimized for packet data. This application is focused on systems and methods that provide the combined advantages of a network oriented towards connections such as the one specified in the TIA / EIA / ie-136 standard and a packet data network, without connection. In addition, this invention focuses on accessing the CDPD network, for example, through existing offline network protocols with very low complexity and very high performance.

SUMMARY OF THE INVENTION In accordance with an aspect of this invention, there is provided a method for storing and maintaining parameters associated with activities in relation to a first channel while a mobile station is located in a second channel or makes use of said second channel. More specifically, when a parameter indicates which activities should be performed, the mobile station returns to the first channel to execute the actions associated with the parameter. For example, parameters associated with a DCCH may be stored when the mobile unit moves from the DCCH to a packet data channel (PDCH). When a stored parameter (s) indicates (s) which activities should be performed, the mobile station can then return to the DCCH from the PDCH and execute the actions associated with the parameter. Since the mobile station returns to the DCCH for the actions instead of staying in the PDCH, the mobile station is active from a system perspective, in both channels. BRIEF DESCRIPTION OF THE DRAWINGS The characteristics and advantages of the invention of the Applicants will be understood by reading this description in combination with the drawings in which: Figure 1 schematically illustrates several messages of Layer 3, Layer 2 frames, and increments Sudden Layer 1 channels, or time segments; Figure 2 (a) illustrates a forward DCCH configured as a succession of time segments included in the consecutive time segments sent on a carrier frequency; Figure 2 (b) illustrates an example of a field segment format DCCH IS-136; Figure 3 illustrates a cellular, hierarchical, or multiple layer, exemplary system; Figure 4 is a block diagram of an exemplary cellular mobile radio system, including an exemplary base station and a mobile station; and Figure 5 illustrates an example of a possible inter-layer sequence mapping of a radio system. DETAILED DESCRIPTION OF THE INVENTION The protocol and the procedures for connectionless communication between mobile stations and base stations in accordance with this invention are focused on optimizing the performance characteristics. Other desirable expansions of functionality by this invention include the introduction of PDCH paging areas and registration, in accordance with IS-136, for example, by providing the option to send Layer 3 messages defined for connectionless communication in a connection oriented DTC. , providing paging indicators according to IS-136 while in the PDCH and providing a notice of PDCH activity while in a DTC. An exemplary set of protocols and specific procedures for increasing aspects of various communications without connection between mobile stations and base stations is discussed below. To help understand, an exemplary layer mapping sequence is illustrated in Figure 5. Starting with a CDPD mobile data link protocol (CDM) chart, this information is mapped in a Layer 3 message. The message of Layer 3 including a protocol discriminator (PD) and a message type field (MT) is mapped in several Layer 2 frames. Then, one of the Layer 2 frames is mapped in a time segment, and an example of a time segment mapped on a PDCH channel. The length of the forward PDCH time segments (FPDCH) and reverse PDCH increments (RPDCH) are still set when there may be three forms of sudden increments of the RPDCH having different fixed lengths. All FPDCH time segments are considered in the physical layer in Figure 5. This description considers that the PDMA frame structure is the structure of the DCCH according to IS-136 and DTC. In order to obtain maximum performance when using a multi-rate channel (double-speed PDCH and triple-speed PDCH), you specify an additional FPDCH segment format.

A mobile station interested in packet data service first finds service on a first channel (Mother DCCH) and reads a broadcast channel information (BCCH) sent there to determine the location (frequency) of the second channel (Signaling PDCH). In addition, the mobile station can read other BCCH information sent in the Mother DCCH and store specific parameters for its operation there. The mobile station is then tuned to the Signaling PDCH and reads additional BCCH information to determine if there is a plurality of PDCHs. If there is more than one PDCH in the current service area, a mobile station will select one as its PDCH assigned in accordance with a key algorithm. If the signaling PDCH is the only PDCH in the current service area, it becomes the PDCH assigned to the mobile station. After determining its assigned PDCH, a mobile station reads the complete Quick Package BCCH information site (F-PBCCH) and extended package BCCH (E-PBHCCH) in its assigned PDCH. The mobile station is then registered, if necessary, in accordance with PDCH mobility management rules. At this time, the mobile station is activated for packet data service in its assigned PDCH in addition to being potentially activated for cellular service in its DCCH Mad e. In one aspect of this invention, a mobile station that has decided to remain synchronized with its assigned PDCH (remain there), you can return the Mother DCCH when stored parameters indicate what specific activity to the DCCH Mother should be done. The mobile station returns to the Mother DCCH and performs the actions associated with the parameter (s) that have been stored and subsequently maintained while in the allocated PDCH. The mobile station is therefore activated from a system perspective, both in the Mother DCCH and in its Assigned PDCH. When the PDCH initially enters a stay state, the mobile station reads a first cycle of the fast packet emission control channel (F-PBCCH) and the extended packet emission control channel (E-PBCCH) in the PDCH current and the mobile station has entered the permanence state in PDCH directly from the state of permanence in DCCH in its Mother DCCH. Messages sent on the F-PBCCH and E-PBCCH channels are received by the mobile station while it is in the permanence state in PDCH. The mobile station continues to receive all these messages until it has received the full set of this transmission from the base station. The mobile station itself reads a total cycle and the mobile station has entered the PDCH permanence state from the DCCH as a result of the response to a warning in the Mother DCCH which indicates that the packet was received. The mobile station will not attempt to access until the initial reading of the entire cycle of the F-PBCCH has been completed first. After reading the F-PBCCH, the mobile station can make access attempts and can process PDCH source transactions, PDCH end, and PDCH register. When the PDCH enters the stay state to operate the PDCH mode only, the mobile station updates and stores information and status of the entries in neighboring lists in the Mother DCCH immediately before entering the permanence state in PDCH. Entries are extracted from the list of cells because the same list can be used for cell reselection while in the PDCH. If the mobile station enters the permanence state in PDCH with the intention of operating in both PDCH mode with IS-136, the mobile station maintains information and status of an additional set of stored values and status information counters. The set of stored and maintained values and counters include neighbors disk entries, PER_TMR, REREG_TMR, TMSI_TMR, REGID, NXTP.E6, REGID_PER, REGPER, and PFC Assigned to DCCH, in accordance with the specification according to IS-136, for example, If one of the synchronizers in this set expires, the mobile station returns to the DCCH from PDCH and performs the actions associated with the expired parameters. In other words, the mobile station returns to the Mother DCCH for activities instead of staying in the PDCH to respond to the associated actions in the PDCH and to maintain this information as necessary. Alternatively, if the mobile station remained in the PDCH to carry out DCCH transactions, such as for example DCCH registration, the amount of integration between IS-136 and PDCH would increase and this would mean greater complexity of the network. When a mobile station alternates between PDCH and regular cell operation, a large amount of time will be spent remaining in the Mother DCCH. To allow the mobile station to be ready to receive packets, it is desirable to avoid general activities, such as registration. Accordingly, the present mode allows the mobile station to return to the PDCH from the DCCH, once the mobile station is registered in the PDCH, without any need for additional registration in the PDCH since the mobile station has made known its location to the PDCH system. The mobile station may remain in the mother DCCH before moving to the assigned PDCH to initiate PDCH activity when a packet transaction originates, but before originating the PDCH activity, the access parameters must be read to determine the rules of the PDCH. access. Accordingly, the F-PBCCH is read. In other words, the rules for access must be obtained by reading a minimum amount of information from the general broadcast information before sending the transaction. This is possible because the mobile station is already registered in the PDCH and therefore its location is known to the PDCH system. Consequently, time is saved since it does not require a re-registration. When a packet transaction ends and the mobile station is in the mother DCCH, the mobile station in the DCCH is called to indicate a packet transaction termination. The mobile station then responds to the paging in the DCCH and moves to the assigned PDCH without any need for additional registration in the PDCH. Then, the F-PBCCH is read and the mobile station is ready to receive end-of-pack transactions. In an alternative embodiment of this invention, a change marker in the DCCH can be used to indicate a change of the F-PBCCH while in the DCCH. If the marker is set to indicate such a change, the mobile station ε moves from the DDCH to the F-PBCCH. After the mobile station has read the F-PBCCH and obtained the changed information it returns to the DCCH and enters the permanence state in the DCCH. Then, if the mobile station moves to the PDCH to originate or terminate a packet data transmission, it is not necessary to read the F-PBCCH since the changes have been updated while remaining in the DCCH. This technique also saves time since the F-PBCCH does not have to be read when it originates or terminates a packet data transmission. Having described the invention, it will be apparent that said invention may exhibit variations. Such variations are not considered to be outside the spirit and scope of the invention, and all modifications that would be apparent to a person skilled in the art are within the scope of the following indications.

Claims (8)

1. • JO
2. CLAIMS 1. A method for maintaining parameters associated with actions in a wireless communication system, comprising the steps of: (a) maintaining actions associated with parameters in a first channel; (b) discriminating in a second channel if one of the parameters indicates that actions associated with said parameter must be executed after a mobile station moves from said first channel to said second channel; (c) returning to said first channel ß starting from said second channel when said parameter indicates that it activates *, must be performed in step (b); and (d) performing the actions associated with said parameter in said first channel. 2. A method according to claim 1, wherein said first channel is a digital control channel (DCCH) and said second channel is a packet data control channel (PDCH).
3. 3. A method of conformance with the rei indicates in 2, where said parameters comprise entries in the neighbor list, periodic reuse time counter information, and record time counter formation, meter counter information. TMSI time, record ID, next record data, periodic record ID, periodic record information, and PFC information assigned to DCCH.
4. 4. A method according to claim 2, wherein the mobile station returns to said PDCH from said DCCH without registering again after having been previously registered in said PDCH.
5. 5. A device for maintaining parameters associated with actions in a wireless communication system, comprising: a memory for maintaining actions associated with parameters in a parameter; a detector for d? st_r miuwr in a second channel if one of the parameters indicates that actions associated with said parameter must be made after a mobile station changes from said first channel to said second channel; a device for returning to said first channel from said second channel when said parameter indicates what actions must be performed in step ib) of the rei indication 1, and a processor for executing the actions associated with said parameter in said first channel .
6. 6. A device according to claim 5, wherein said first channel is a digital code channel (DCCH) and said second channel is a tn l u * - packet data control (PDCH),
7. 7. A device in accordance with the rei indication 6, wherein said parameters comprise entries in neighbor list, periodic record time counter information, re-record time counter information, TMSI time counter information, record, next record data, periodic record ID, periodic record information, and PFC information assigned to DCCH.
8. 8. A device according to claim 6, wherein the mobile station returns to said PDCH from said DCCH without re-registering again after having been previously recorded in said PDCH.