JP2003528506A - Scheduling of access channels in wireless communication systems - Google Patents

Abstract

(57) [Summary] The present invention relates to a process of scheduling an access channel for a radio channel shared by a plurality of mobile devices of a UMTS mobile communication system. This process allows the mobile device to access the base station (BTSC) to signal a dedicated channel assignment request, or in the case of asynchronous inter-cell handover, direct access to a new channel. The process consists in marking the basic TDMA-CDMA frames in multiple frames with independently controllable periodicity and phase. An equal-phase set of marked frames forms a sub-channel shared by the mobile device and performs the particular access type associated with this sub-channel. This access is performed by the mobile by transmitting a code sequence randomly selected from a plurality of different sequences associated with the carriers used in the cell. To mark the frames of the subchannel, use the following type of representation: SFN module [P1] = P2, where SFN is the system frame number and P1 and P2 are the BTSs in the common control channel. The first parameter in the system information message to be advertised by the network or over time are two parameters included in the following messages: paging request, immediate assignment, handover command, uplink free.

Description

Detailed Description of the Invention

FIELD OF THE INVENTION The present invention relates to the field of mobile radiotelephones, and more particularly to processes for coordinating access to shared radio channels in third generation mobile systems.

BACKGROUND OF THE INVENTION For the last ten years, mobile radiotelephone systems have been characterized by digital modulation and extensive digital signal processing (DSP) of baseband signals converted to digital signals, as opposed to the first generation. Second generation systems have been preferred and constant technological developments have been made, including the gradual abandonment of first generation systems featuring analog modulation of the transmission carrier. Nowadays, the arrival of services in mobile systems, so-called third-generation systems, is advancing, which is different from conventional systems in terms of different access methods to physical channels by users of services, and is now ripe. The design of these systems has investigated the feasibility of transmission, which is suitable for preserving the fidelity of the information transmitted and for guaranteeing a certain immunity to noise (jamming) due to jamming purposes. Followed by using applications obtained in the military environment. This goal has been achieved by the artificial extension of the modulation spectrum of the transmission carrier compared to the baseband spectrum. Therefore, this modulation method is called spread spectrum method (spread spectrum), and is intended to increase each low symbol rate (rate) of a symbol (signal) transmitted in a pseudo-noise type code sequence at a higher chip rate. Yes, the range is the range in which the transmitted information is spread over a wide spectrum of frequencies, making it practically accessible only to those who are duly authorized to receive it. For this purpose, a spread spectrum receiver demodulates the received signal and performs a temporal correlation between the demodulated signal and the local copy of the code sequence used by the modulator to reconstruct the original data. Constitute. From the mathematical correlation between the symbols of the demodulated signal and the correct code sequence, the maximum level of the original signal is obtained at the output of the receiver, which is thus distinguished from noise and interference. In the civilian environment, and especially in the field of mobile radiotelephony, it is envisaged to use spread spectrum with modulation quite different from conventional military purposes. A particular use is to allow simultaneous sharing of the same physical channel among more users, identified by different spreading codes. Acronym CDMA (Code Division Multiple Access)
The related technique known as uses a mutually orthogonal spreading code sequence whose cross-correlation can be assumed to be zero. This allows distinguishing between different users clustered within the transmission band, as the signals of the other channels on the channel characterized by their own code sequence appear as noise as a result of the correlation. Compared to conventional narrowband systems, this spread spectrum technique offers the additional advantage of high insensitivity to the selective fading of Rayleigh due to multiple reflections of the transmitted signal along the radio transmission path, The transmitted signal derives such fading because the small part of the spectrum for high fading is only a very small part of the spectrum predominantly occupied by the useful signal.

Third generation mobile communication systems, or UMTS (Universal Mobile Telecommuni
cation system: general mobile communication system) is the
It raises many of the major issues of compatibility with the LMN system (Public Land Mobile Network), of which the broader one is undoubtedly the GSM900MHz (Global System for Mobile commun
ications: Global system for mobile communications) and its direct successor DCS1
It is 800MHz (Digital Cellular System). GSM is designed to make different communication systems compatible and thus able to communicate.
Appropriate international organization (ETSI / ITU) with the purpose of equalizing the operation of different communication systems.
-T environment according to the specifications published as a recommendation by CEPT / CCITT).
3GPP organization (3rd generation joint project) and Chinese organization CWTS (Chinese wireless communication standard)
Applicants acting pursuant to pursuing the development of their third generation mobile communication system based on CDMA technology. The goal in the near future is to preserve the functional characteristics of GSM when possible, but to intervene whenever the impact of new CDMA technology necessarily requires a special solution. Therefore, before describing the preferred embodiments of the present invention, it is necessary to explain some operational peculiarities of the GSM system in order to enable a better understanding of the technical problems that the present invention must solve. is necessary.

FIG. 1 shows a simple but clear block diagram of the functional architecture of a mobile system of the GSM or DCS type, which is a CDMA in which the invention to be described resides.
It can also be fully used to describe the system (TD_SCDMA). In FIG. 1, a portable telephone set and a vehicle telephone set are related transmission / reception base stations deployed in an area.
A symbol MS (Mobile Station), which is also called a mobile device in the future, is wirelessly connected to an associated TRX transceiver (transceiver, not shown) belonging to BTS (Base Transceiver Station).
: Mobile station). Each TRX is connected to a group of antennas whose antenna configuration ensures uniform radio coverage of the cells served by the BTS. A group of N adjacent cells that jointly engage all carriers available for mobile radio services is called a cluster, and the same carriers can be reused in adjacent clusters. More base stations of BTS type are BSC (Base Station Controller:
A common base station controller represented by a base station controller) is connected via a physical carrier. The more BTSs that are managed together by the BSC, the BSS (Base St
ation System: base station system) to form a functional subsystem.
More BSS (BSC) 64kbit to optimize direct or related use
A mobile switching center MSC (Mobile Switching Center) via a TRAU block (Transcode and Rate Adapter Unit) that enables sub-multiplexing of 16 or 8 kbit / s channels on the / s connection line. : TRAU is a GSM full-rate 13kbit / s (or GSM half-rate) that enables addressing of voice at 64kbit / s to 16kbit / s or 8kbit / s of voice. Convert code to 6.5kbit / s).

The MSC block, in turn, is the terrestrial network PTSN (Public Switched Telephony).
e Network: Public Switched Telephone Network and / or ISDN (Integrated Services Digital)
Network: Integrated service / digital network) connected to the switching center. Two databases called HLR and VLR, which are not visible in the figure, are generally located in the MSC.
Database of each mobile MS contains invariant data, the second database contains variable data, these two databases allow users to move widely across areas spread across different European countries. Work together to allow you to track. The BSC station controller also has a personal computer LMT (Local Maintenance Terminal) that enables man-machine interaction, and O & M functions (operations such as monitoring, management alarm, and traffic measurement evaluation).
& Maintenance: Operation and maintenance center OMC that performs a function called "Operation and Maintenance", and finally SGSN block [Serving GPRS (General Packet Radio Service) Support Node] (GSM04.64) for packet switching data service [GPRS (General Packet Radio Service) Supporting Node]).

The figure shows vertical dashed lines defining the limits of the interface between the main functional blocks, ie the radio interface between MS and BTS is indicated by Um and the interface between BTS and BSC is A-bis. The interface between BSC and TRAU is A-sub, and TRA
The interface between U and MSC or directly this last one and BSC is A, the interface RS232 between BSC and LMT is T, the interface between BSC and OMC is O, Finally, the interface between the BSC and SGSN is marked Gb. The above interface is based on the following GSM recommendations: 04.01 (Um), 08.51 (A-bis), 08.01 (A) and 12.20
And 12.21 (O) and 04.60 (Gb).

FIG. 2 illustrates an imminent and more advanced scenario compared to the scenario of FIG. In FIG. 2, at least one cell served by the BTS of the GSM system is a base station BT of a new system called 3G (third generation) including the inventive object of the present application.
It is shown as adjacent to the cell served by the SC. The connection lines between the different blocks indicate the type of associated interface. In this figure, the authors can pay attention to the station controller block BSCC connected to both the BTS station and the BTSC station. This BSCC block represents a station controller that has been properly modified for GSM, but can support a new BTSC station (dashed lines indicate the existence of the modification). The connection between the BSCC and the new BTSC uses an interface similar to A-bis. The wireless interface between the BTSC and the mobile device is called Uu to distinguish it from the GSM Um interface. For the same purpose a mobile device is called UE (User Equipment) to mean a different description of the radio interface and mobile device under different names and consistent with different design settings. From the scenario of Fig. 2 it can be discussed the handover between two systems GSM, 3G supported by the BSCC block supporting normal intra-system handover in which dual mode and multi-band operation of the mobile user equipment UE are derived. Is the possibility.

In the design of a mobile system, the aspect that mainly influences the design method is the selection of the type of access to be realized on the physical channel in order to share the band available to different users. The better known access methods are the FDMA method (frequency division multiple access), which performs frequency division multiple access, and
TDMA method (time division multiple access) that executes time division multiple access, CDMA method (code division multiple access) that executes code division multiple access, and SDMA method (space division multiple access) that executes space division multiple access Is.

The FDMA approach allows each user to utilize their own frequency channel, which is not shared with any other user, whenever SCPC
This case, called (Single Channel Per Carrier: 1 channel per carrier), is typical in first generation analog systems. In the TDMA approach, the entire radio spectrum is assigned to more users at different times called time slots. Only one user can transmit and / or receive during one time slot. In the CDMA approach, the entire radio spectrum is assigned to more users at the same time, but this approach has been previously described. In the SDMA method, the entire radio spectrum is assigned to more users at the same time as in the CDMA method, and the distinction between different users is made by the perception of different directions of arrival of the radio signals.

The above access techniques in the same mobile system can be used separately or together to take advantage of possible cooperation. GSM systems use a mixed technique, FDMA-TDMA, which avoids excessive use of carriers compared to pure FDMA, while avoiding frame construction that is too long for pure TDMA and is not recommended. To do. The new 3G system relates the benefits of GSM to the benefits of CDMA techniques in FDMA-
Use TDMA-SCDMA access. Both the GSM system and the new 3G system can add SDMA multiplexing to the existing multiplexing and get good results from the use of intelligent antennas, which certainly applies to 3G systems.

In the PLMN system, a user can send information to the same station while receiving information from the base station. This communication mode is called full duplex and can be operated using both frequency field and time field techniques. FDD method used in GSM (
Frequency Division Duplexing uses different bands for the uplink path (uplink) and the downlink path (downlink). These two bands are separated by an unused gap band that allows proper radio frequency filtering. The TDD method (Time Division Duplexing) uses different service times for the uplink and downlink for all channels multiplexed in the two transmission directions. If the time division between the two service times is small, the transmission and reception are visible to the user at the same time. The new system 3G to which the invention refers uses the TDD approach.

Any public mobile system (PLMN) that seeks to provide users with a quality of service standard that is comparable to the quality of service provided by the fixed telephone network will inevitably adapt to complex signaling. . In the GSM system, as we could notice, the problem has been solved using a special solution for the FDMA-TDMA method. These solutions are at least for CDMA, with respect to air interfaces that have major impacts.
It is not possible to directly transfer to the telephone system by the method. We note that third generation mobile systems are in the dawn and therefore some information about the definition of suitable signaling is disseminated only within the limited committees of the companies participating in the definition of their own system. It has been done and cannot yet be considered a public property. It is then useful to give a general view on GSM (or DCS) systems, which are the most advanced systems in terms of diversity and quality of service provided, based on internationally shared views. The following considerations, which are supported by FIGS. 3 to 8, are in addition to the different CDMA approaches of channel multiplexing, the present invention being particularly relevant for the construction and use of signaling channels for access and handover of radio channels by mobiles. Is aimed at a GSM system (or indistinguishable from DCS) that is about to excel (possibly considered properties in itself can be considered known).

In the GSM900 system, the available bandwidth is subdivided as follows: -Uplink direction (MS → BTS) subband is 880-915 MHz, -Downlink direction (BTS → MS) subband 925 to 960MHz, 915 to 925MHz for gap band 10MHZ; 200kHz channeling pace; 173 carriers per subband; 8 time slots per carrier; 1384 full rate channels; half rate There are 2768 channels.

In the DCS1800 system, the available bandwidth is divided as follows: -Uplink direction (MS-> BTS) subband is 1710 to 1785 MHz-Downlink-direction (BTS-> MS) subband 1805 to 1880MHz, ・ Gap band 20MHz is 1785 to 1805MHz; channel band is 200lHz; number of carriers per subband is 374; number of time slots per carrier is 8; number of full rate channels is 2992; half rate channels The number of is 5984.

FIG. 3 is repeated indefinitely due to the use of eight time slots TS0, TS1, TS2, TS3, TS4, TS5, TS6, TS7, or of the carriers used in one cell. 7 shows a sequential structure of time slots in a basic frame to be processed. The set of carriers and time slots form a physical channel of the Um interface that is intended to support the information that characterizes the channel from a logical point of view. The basic frame of FIG. 3 contains all time slots coming from a single transmission direction, which is FDD symmetric full duplex multiplexing driven by a GSM system.

In the figure, the authors can note four different burst signal shapes, which correspond to the possible contents of the time slots. The series of frames consists of more hierarchical levels seen by all carriers used in the GSM system.
All carriers carried by one BTS carry frames that are synchronized with each other, thereby enabling frequency hopping, which is compatible with carriers assigned to physical channels, increasing system flexibility, and Simplify synchronization between adjacent cells. That is, starting from the bottom of the figure to the top, 156.25 × 3.69
Each time slot with a duration of 0.577 ms, which corresponds to a μs bit duration, has 14
It carries an information burst signal containing 2 useful bits, 3 leading bits TB and 3 trailing bits TB, and an information-free guard time GP of 8.25 bits in length. There are four different types of burst signals, depending on their length (GSM05.02, paragraph 5.
See 2).・ Normal burst signal. This is 2x58 useful bits, with included redundancy, and GMSK
26 bits of a training sequence of midamble (text) positions used for estimating impulse response of a radio channel useful for correct demodulation of a radio signal modulated according to a method (Gaussian Minimum Shift Keying). Different midambles are predicted, especially with respect to the use of SDMA techniques. Burst signals are typically used on traffic channels and associated signaling channels. 2x5 for voice
The 8 useful bits are sss in the final result of a composite operation of blocks of 260 bits each generated every 20 ms at the output of the 13 kbit / s speech coder. This operation, described in most of GSM05.03, consists of the following steps: re-ordering with block and convolutional coding steps that introduce redundancy that increases the number of bits from 260 to 456. Partitioned and diagonally interleaved with a depth of 8 time slots to spread the burst error over more burst signals, add steal flags and 2x58 bit sub-block pairs Is obtained, encryption, that is, summing bit by bit in the encryption flow, and constructing a burst signal by adding a midamble and bit TB to obtain an access burst signal. The inter-laced interlacing of the bits of the following block and the preceding block, the bit distribution of the coded block over more burst signals reduces bit loss per block in case of burst signal transposition and convolutional decoding. Improve the possibility of reconstructing origin information. -Frequency modified burst signal. The burst signal is at a logic level "1" to allow modification of the mobile device clock frequency when the burst signal is received.
Including 142 useful bits. -Synchronous burst signal. This is a 2x3 with a 64-bit "sync column" in the midamble position.
Including 9 encryption bits. This burst signal is received by the mobile device with a delay of eight time slots from the preceding burst signal, and therefore a mobile that has already modified the frequency of its own clock will have the correct position of the "sync train" in the received burst signal. And the start time of the time slot can be discriminated. The encrypted bits carry the information necessary to reconstruct the frame number FN (Frame Number) to complete the synchronization procedure. -Access burst signal. It contains a 41-bit sync sequence at the start position followed by 36 encrypted bits. The guard period GP has a duration of 58.25 bits, and further has seven leading bits TB and three trailing bits TB. This short form of the burst signal is typically used by the mobile to send the first signal to the network, for example to perform access in an originated call or handover, so it is a full form of the preceding burst signal. It has a shorter duration, and consequently a larger portion of the unused time slots. This property actually does not invalidate the position of adjacent time slots, which may interfere with ongoing communication, since the timing is typically changed by the propagation delay due to the varying distance between the radio station and the mobile. , Allows the mobile to send its message to the network at times that are not perfectly matched.

Continuing towards the top of FIG. 3, it can be noted that the basic frame TDMA with a duration of 4.615 ms contains 8 time slots (TS0 ... TS7). In the frame of the same information flow, two different continuous multi frames are predicted, and the traffic of 120 ms duration / multi frame is 26 basic frames of TDMA.
In addition, the control multiframe with a duration of 253.38 ms is 51 basic frames of TDMA.
Is included. These two multiframes consist of a TDMA of 1326 basic frames6.
Together they form a unique superframe of 12 seconds duration, and finally 2048 consecutive superframes form a TDMA hyperframe of 2,715,648 basic frames with a duration of 3 hours 28 minutes 63 seconds 760 milliseconds. To do. The frame number FN wirelessly spread in the cell is related to the frame position in the hyperframe.

FIG. 4 shows a structure of logical channels supported by the frame structure TDMA of FIG. With reference to FIG. 4, we note that the expected set of logical channels includes a class of traffic channels TCH and a class of control channels. TCH channels can be full rate TCH / F type or half rate depending on whether a single logical channel or two alternating links are assigned for the relevant time slot or according to the channel coding used. It becomes TCH / H type.

The control channel classes are the following major channels: a public information channel BCCH (Broadcast Control CHannel) and a common control channel CCCH (Common Co
ntrol CHannel) and several dedicated control channels DCCH (Dedicated Control CHa)
nnel) and. The BCCH channel includes three subchannels: a BCCH subchannel in a narrow sense, a synchronization subchannel SCH (Synchronization CHannel), and a frequency correction channel FCCH (Frequency Correction CHannel). CCCH channel has 3 sub-channels: shared access and sub-channel RACH (Random Access)
CHannel), grant sub-channel AGCH (Access Grant CHannel), and paging (call) sub-channel PCH (Paging CHannel). The dedicated control channel DCCH is of two classes, the "stand-alone" channel SDCCH (S
It can be divided into a class of tand-alone Dedicated Control CHannnel) and a class of traffic related channel ACCH (Associated Control CHannel). This latter class consists of a slow associated SACCH (Slow ACCH) and a fast FACCH (Fast ACCH), respectively.
) Includes two channel types. After a general listing of channels, it is worth examining them in terms of their composition and application. -The TCH / F traffic channel is a bidirectional channel assigned to mobile devices that have completed or terminated access procedures to the network in the originating call and are subject to handover or frequency hopping. They are,
A normal burst signal is used to carry a payload of 13 kbit / s coded voice or data in a circuit or packet switched with a net bit rate of up to 9.6 kbit / s. The traffic channel TCH / H carries 6.5 kbit / s encoded voice or data in a circuit or packet switched with a net bit rate of up to 4.8 kbit / s. Compared to the previous channels, these channels are of poor quality. The control channel BCCH is a point-to-multipoint downlink unidirectional channel using carrier f0, time slot 0 of said carrier BCCH. This channel is unique in the cell and is not subject to handover or frequency hopping. The narrowly defined channel BCCH is, for example, a channel configuration in a cell, a list of BCCH carriers of adjacent cells for level measurement, location area (existing area) identification information, cell selection reselection operation and completion cell identification. , The operating parameters of the mobile device in idle mode, and finally the so-called RACH CONTROL parameter, which is used to schedule access attempts of the mobile device on the RACH channel. FCCH channel and SC carried by a frequency modified burst signal and a sync burst signal respectively
The H channel is sequentially used by the mobile device to synchronize the frequency of the mobile device's own carrier with the start of the locally generated frame (start of time slot 0) and the position of the frame in the hyperframe. In a TDMA system, it is fundamental for burst signals to fall exactly within the assigned time slot due to interference in adjacent time slots, which must be checked while the mobile is moving. . For this purpose, BTS is an ADAPTIVE FRAME ALLI
Initiates a procedure called GNMENT (described in Recommendation GSM04.03) which causes the BTS to transmit by the mobile despite the round trip propagation delay variability due to the MS distance variability from the BTS. Instructs the mobile about the degree of transmission advance in order to receive a time slot on an uplink frame with a constant delay of 3 time slots for The SCH channel contains a BSIC field (Base Station Identity Code) with cell identification information useful for the mobile to identify the BCCH carrier of the serving cell from the BCCH carrier of the adjacent cell. The control channel CCCH is a bidirectional channel that serves the entire cell,
It receives neither handover nor frequency hopping and uses time slot 0 of the f0 carrier. The RACH shared access channel exists only in the uplink direction for sending out access requests of randomly distributed mobile devices to the network, and is carried by an access burst signal. Multiple access may cause controversy regarding ownership of the channel to be resolved, eg via the “slot ALOHA” procedure described in GSM 04.08. -Point-two channels of multi-point type SGCH and PCH exist only in the downlink direction and move from the network in the response of the network to the access request made by the mobile device on the RACH channel and the ending call procedure. It carries so-called paging messages that are sent to the device. The dedicated control channel DCCH is a point-to-point type bidirectional channel, and receives handover and frequency hopping. These channels are 33
It can carry signals at bit rates in the range of 3.3 to 8000 bit / s. The "stand-alone" channel SDCCH carries signals for network functions such as subscription and control of calls for TCH channel allocation. Immediately after the mobile has access to the network, one SDCCH channel is allocated. Channels ACCH, SACCH, FACCH are each included in the same multiframe of the associated traffic channel. In particular, the SACCH channel carries in the uplink direction transmission measurements made by the mobile on the signals received by the serving BTS and neighboring cells, and in the downlink direction the associated TCH ( It carries various commands for the mobile such as timing advance (first) SDCCH channel, power control, etc. and neighbor cell information. The FACCH channel is obtained via bit interleaving of its own channel TCH (bit steal) and can therefore be used for signaling with speed requirements higher than the speed of the SACCH channel.

FIG. 5 shows a case of a medium / small BTS equipped with several transceivers and a medium / small scale BTS.
2 shows two possible configurations of logical channels in multiple frames for a large BTS.
This figure includes descriptive text that can be understood without explanation. Of course, the 26 traffic frames and the related signal multiframes 1) and 1 ') are the same in the two cases, but they are different in the 51 control frame multiframes. During the frame idle (-) of multiple frames 1), 1 '), the mobile device makes power measurements on the BCCH carriers of neighboring cells and also pre-synchronizes (frequency, frequency) in consideration of possible handovers. Get the relevant FCCH and SCH for the time slot, frame number, BSIC). These measurements are possible due to the fact that the lengths 26 and 51 of the two multiframes are represented by a prime number between them so that there is a guarantee that the channels monitoring the neighboring cells will shift within the acquisition window. Is. It can also be noted that the downlink radiated channels FCCH and SCH in time slot 0 always occupy two adjacent frames that follow one another at intervals of approximately 45.6 ms. This time of about 45.6 ms is a reasonably short time according to the synchronization requirements of the mobile accessing the network for the first time or remaining idle. Access channel
Regarding RACH (CCCH), we see that these channels occupy the whole uplink / multiframe 3) or the majority of uplink / multiframe 5). This is possible because each of these channels is a single channel of the TS0 group in the uplink direction. Remaining time slots in the downlink direction
Channel 0, that is, BCCH and CCCH (AGCH, PCH) in a narrow sense are present in a group of four consecutive basic frames in which the CCCH group is prioritized. Compared to small BTS, medium / large BTS requires control channel allocation into two subsequent multi-frames.

The control logic channel of the radio interface Um, configured for example as shown in FIG. 5, routes information in two propagation directions as messages exchanged between the mobile and the network. This information is passed through the Um interface frame,
More or less related to the rest of the network seen in FIGS. In order to allow the normal operation of the complex mobile system GSM, it is necessary to regulate both the shape and flow of messages by a suitable protocol.

FIG. 6 shows a diagram of a protocol with several hierarchical levels used by the GSM system to manage telephone signals present on various interfaces. For the most part, this protocol derives from the protocols currently used in the mobile analog systems TACS and PTSN telephone systems and coordinates this with the requirements of the radio interface Um and the requirements derived from the user's mobility. Some blocks (PHL, MAC, RRM) are marked with dashed lines to indicate that the 3G system uses the appropriate version of a given protocol. The level structure allows the signal protocol functions to be subdivided into overlapping groups on the control plane (C-Plane) and described as a series of independent stages. Each level utilizes the communication services provided by the lower level and provides its own service to the higher level. Level 1 of the above protocol is closely related to the type of physical carrier used to connect two sides with different interfaces, which is the radio connection to interface Um and the terrestrial to A-bis and A interfaces. It describes the functions required to transfer the bitstream over the connection. Level 1 of ground connection is described in CCITT Recommendations G.703 and G.711. Level 2 creates the function of controlling the correct continuous flow of messages (transport function) for the purpose of implementing a virtual carrier between the connection points without error. Level 3 (called the network level) and higher levels create message processing functions for control of the main application processing. Appendix APP1 is a legend listing the terms used in FIG. 6 and FIG. 6 relating to Level 2 (Table A) and Level 3 (Table B), respectively.
And two tables that describe the function of the blocks of.

Now that the main elements that help the operation of the GSM system are introduced, it is worthwhile to briefly examine some typical functions triggered by the operation of the MS mobile device set: The method of executing these functions will be compared with the method of executing similar functions, which is the subject of the present invention.

In the mobile communication system GSM, the mobile device MS performs a predetermined operation even in the “idle mode”, that is, when a dedicated channel is not assigned to the mobile device. In fact, the mobile needs to be able to communicate over the network as a first step in order to constantly select the cell to be associated during the movement of the mobile. The above operation is included in the "cell selection" function described in Recommendations GSM 03.22 and 05.08. An additional requirement is to monitor paging messages in response to possible call terminations.

In the case of “cell selection”, the mobile selects the cell to be associated and scans for BCCH carriers that are receivable from a predetermined number of cells closer to this mobile's position in the cluster. This is done via synchronization and reading the contents of the BCCH PR channel according to the method already described. For each BCCH carrier, the mobile measures the power and quality of the received signal to update the list of at least 6 more favorite cells. The first cell in this list is the most reliable cell to which this mobile is connected. Access to the MS network is as follows: In the case of the user's self-originating in the outgoing call, 2. In the case of self-transmission of MS for network signal in closing call, 3. In case of self-transmission of MS to network signal by transmission of handover command briefly describing handover, MS that does not handle any action that is not a user action or network action for certain functions such as subscription, authentication, etc.
Occurs in the case of self-calling. When a connection is made with the establishment of a dedicated channel following the above access, the network establishes a handshake phase that defines the encryption on the RR connection. This encryption method uses the encryption algorithm A5 (encryption method) described in GSM03.20. According to this method, a Level 1 data flow transmitted on a DCCH or TCH is encrypted by an algorithm A5 using a key called an "encryption key" determined as specified in subclause 4.3. It is obtained by summing the data flow of the user bit by bit by the digitized bit stream. For proper synchronization, algorithm A5 needs to know the system frame number TDMA FRAME NUMBER. The Deciphering method applies the same steps of the encryption method in reverse order to the received signal.

Since the inter-cell handover execution protocol is an object of the present invention, only point 3 of the above points will be examined as an example of a handover application according to the background art.

FIG. 7 shows a diagram of the message sequence involved when the mobile originates a call and the result is successful. The order is as follows: -The mobile that wants to access the network is included in the burst signal of access.
Send CHANNNEL REQUEST on the control channel RACH. To minimize the probability of collisions, the burst signal uses only one 8-bit packet for access, with some bits randomly assigned. These bits continue to mark the request as an address for the next distinguishing return message. (The MS sends the complete identification after making the dedicated channel address assignment.) Sublevel 3 in relation to the protocol possible in the mobile.
The CM (Fig. 6) receives the setup request and initializes the connection MM. The sub-level MM assigns a transaction (processing) identifier and requests the initiation of an RR connection. In response to the x CHANNNEL REQUEST, the network sends an IMMEDIATE ASSIGNMENT message on the AGCH channel, the contents of this message are the channel description, TIME ADVANCE,
Maximum transmission power, frame number that received the access burst signal (FRAME NU
MBER), and a criterion that allows all mobiles waiting for the same message on the AGCH channel to know whether or not they have been selected, the mobile device according to said time advance said immediate The time slot following the IMMEDIATE ASSIGNMENT message shall be sent. -The mobile receives the "IMMEDIATE ASSIGNMENT" message and acts accordingly, after which the service request message CM service request (CM SER
VICE REQUEST) is transmitted on SDCCH, and this channel is used until TCH channel allocation. However, if "Direct TCH Assignment" mode is enabled, SDCCH
The entire signal transmission carried out on the channel can be carried out on the TCH channel. -The network must have the correct IMSI (International Mobile Subscriber Identity:
Establish a handshake step to authenticate the identity of the mobile checking mobile identification code). • The network establishes a handshake stage to specify encryption on the RR connection. This encryption method is based on the encryption algorithm A5 described in GSM 03.20.
Use (encryption method). According to this method, the level 1 data stream transmitted on the DCCH or TCH is the user data stream, which is referred to as the "encryption key" defined by the subclause 4.3 specification. Along with the encrypted bitstream generated by the algorithm A5 used, it is aggregated bit by bit. For correct synchronization, algorithm A5 needs to know the time division multiplex frame number (TDMA FRAME NUMBER). The decryption method applies the same steps as the encryption method on the received signal, but in the reverse order. The mobile station MS starts sending the call to the network before the SETUP message and the network accepts the call by initiating a response with the CALL PROCEEDING message. • The network uses the assignment command (ASSIGNMEN) for TCH channel assignment.
T COMMAND) with the associated SACCH and FACCH to the MS. The mobile responds in assignment mode. • The network sends an ALERTING message to the mobile to indicate that it has initiated the user's alert procedure at the called location. • The network sends a CONNECT message to the mobile indicating that the call has been accepted at the remote terminal and the connection in the network has been established. • The mobile responds with a CONNECT ACKNOLEDGE message and the call goes into conversation.

FIG. 8 shows a diagram of the message sequence associated with the case of a successful call ending towards the mobile. This procedure is very similar to the previous one, with the following differences. • The network sends a paging request message (PAGE REQUEST) on the paging channel PCH. The mobile responds with a channel request (CHANNNEL REQUEST) contained in the access burst signal on the control channel RACH. -In response to a channel request (CHANNEL REQUEST), the network immediately assigns (IMMEDIATE ASSIGNME) including physical information (PHYSICAL INFORMATION).
NT) message on the AGCH channel. • The mobile uses the SDCCH channel until TCH allocation, requesting a service to send a PAGE RESULT message on the SDCCH channel. • This is followed by the authentication and encryption / decryption steps already described. • The network initiates the call initiation handshake phase with a SETUP message, and the MS responds to this message with a CALL CONFIRMATIOM message.・ MS sends a call confirmation warning (ALERT) message. -This time the MS starts the handshake phase of ACCEPTED.

At each instant, both the mobile and the network can send a DISCONNECT message to request call release. For example, if the MS signals completion, the network responds with a RELEASE message requesting the end of the transaction. The mobile confirms the release of the call with a RELEASE COMPLETE message. Upon completing all the connections at the CM sub-level (Fig. 6), the network releases the associated traffic and allocated signaling channels.

Finally, three important functions of the GSM system are described, these are "adaptive frame alignment (ADAPTIVE FRAME ALIGNMENT)" and "power control (POWER CONT
ROL) ", and" HANDOVER "function, referred to as mobile device and / or
It is based on the performance of certain transmission measurements by the BTS. Information on this relationship can be found in GSM
Given by 05.08 Recommendation. These three functions are called "Discontinue Transmission".
In this case, it is also executed when a specific function referred to as "inuous Transmission)" is applied, and only when the carrier is modulated by this specific function, for example, only when some operation is in progress on the TCH channel, Carrier by BTS (
Carrier wave) transmission becomes possible. The purpose of this last function is to reduce the average disturbance level in the network while at the same time increasing the autonomy of the operation of the mobile device. In the case of "Discontinuous Transmission", only the 12 frames which are always surely present among the 104 frames on the SACCH channel are measured and averaged.

The transmission measurements performed by the MS in the downlink direction relate to the level and quality of the TCH and SDCCH channels in use and the level of BCCH carriers of neighboring cells. The measurements described above generate the values to send to the BTS on the SACCH channel. In particular, each MS performing this measurement on the TCH / F channel computes the average of the measurements extended to SACCH multiframes (multiframes) of 104 basic frames, which corresponds to a time of about 480ms, and this average Is included in the SACCH channel of the subsequent multi-frame.

The transmission measurements performed by the BTS in the uplink direction involve the level and quality of the TCH and SDCCH channels in use, the value of the TIMING ADVANCE parameter, and the interference on free time slots. In this case, the average value calculated by BTS is obtained by averaging the measured values on each SACCH multiframe for each MS that refers to the measured values.
In connection with the average value calculated by the MS, both of these average values are sent to the BSC through the interface A-bis used in the frame function. However, this transmission is performed by the power control function and the handover function.
And it is limited to time advance (TIMING ADVANCE).

The power control function consists in gradually changing the power of the transmitter by a step having a previously set width. Power control is controlled by the BSC, forced on the mobile device, and optionally on the TRX of the BTS. Power control occurs separately on a single channel basis and on a single MS basis on all time slots associated with the traffic TCH channel and control SDCCH channel, but always at maximum power. Excludes BCCH carrier time slots that carry the channel. Considering the power control performed on the mobile device, two cases are possible, the first of these is to increase the power of the transmitter step by step with a preset width. In the second case, the power is increased in the same way until the maximum permissible output level of the transmitter is reached, in order to reach the minimum level suitable for the transmission conditions in. In the first case, the aim is to reduce the disturbance level on each channel, which in fact makes this possible even in very small cells, and secondarily the autonomy of the operation of the mobile device. The purpose is to increase.
In the second case, the purpose is to avoid a handover due to wireless reasons when possible. The power that the BTS emits on each time slot of each radio carrier can have a level (emission level) according to the distance separating the BTS from the MS, which distance is based on the TIMING ADVANCE parameter. Evaluated, this parameter makes it possible to obtain the radial distance of the vehicle and thus the path loss by a simple calculation. Commands for the mobile transmitter travel on the SACCH channel at a rate of approximately 2 commands per second,
It allows a minimum change of 2 dB every 60 ms, which shows that deep (> 12 dB) and well-spread attenuation (fading) cannot be compensated with a single command.

The procedure of adaptive frame alignment (ADAPTIVE FRAME ALLIGNMENT) is performed by the BTS to maintain three fixed lead time slots between downlink and uplink frames. These three time slots make it possible to eliminate the double filter in the transceiver's antenna and simplify the production of the product. When a dedicated connection is established, the BTS continuously measures the time difference between its own burst signal and the burst signal received from the MS, and the average of these measurements is the time advance (TIME ADVANCE) put in the SACCH channel. Corresponds to the parameters and the downlink transmitting approximately twice per second. The mobile MS sends its own burst signal using the value received for the time advance correction. The maximum permissible modification is 235 μs, which is sufficient to provide the cell with a radius of 35 km without overly limiting the speed of the mobile device.

Finally, the mobile is inspected by the handover procedure and the execution of the handover procedure commands the mobile with the network operating in “dedicated mode” to direct this mobile to other channels of the cell. Allows you to force someone to go.
Handover is an important function for any mobile telephone system, which allows mobiles to communicate while moving within a large area during communication. In fact, this feature prevents the degradation of the transmission quality of the communication channel, which is inevitably caused by the mobile becoming progressively further away from the antenna aggregate of its own cell where it is first served. To do. This protective action must be achieved such that the user cannot perceive the noise on the communication in progress.

The first criterion that characterizes a handover is the localization of “switching points” in the infrastructure, where the switching points are in a hierarchical structure that links the functional components (entities) before and after the handover. Intended element. Less than,
The subscript "old" indicates all functional components on the communication path before the handover, and "new" indicates components after the handover. In a GSM system, the BSC initiates a handover if the poor transmission quality of the channel in use is the reason, and the MSC requests and controls the handover if due to excessive traffic in the cell, And finally, some operations and maintenance centers
A handover can be requested to perform the O & M function. As far as the handover topology is concerned, these handovers are called “in-cell” when they are performed between channels of the same cell, and conversely when they are performed between channels of different cells. "Between cells". Intra-cell handover involves MS and BTS and is generally controlled by the BSC controlling the BTS. Inter-cell handover involves an MS and two BTSs, which can be internal or external, depending on whether the two BTSs belong to a single BSC or different BSCs. In the first case, the same BSC can control the handover, in the second case the MSC must control the handover.

The second criterion that characterizes the handover is the method of identifying the TIME ADVANCE to be used in the new cell. Based on the above method, it is possible to distinguish between two types of handovers, that is, a synchronous handover when performed between cells synchronized at the level of a hyperframe, and an asynchronous handover which is the opposite example. In the synchronous case, the mobile itself can calculate the TIME ADVANCE and apply it in a new cell, and in the asynchronous case, the mobile sends the appropriate access burst signal to the dedicated channel. And send a new BTS to the correct time advance (TIME AD
VANCE) must be able to be calculated. Of course, the execution time of the handover is shorter in the first case, which is 100 ms or less, and approximately doubles in the asynchronous case.

FIG. 9 shows a diagram of the message order associated with the case of asynchronous inter-BSC handover with successful results in the GSM system. For the sake of simplicity, the figure ignores all protocol stages for protocol elements commonly referred to as "NETWORK". This does not defeat the purpose of the description, as those skilled in the art of knowing GSM specifications for handover have sufficient background to complete this omitted part. Synchronous handover is a so-called PHYSICAL INFORMATION
It can be read in the figure with the reception step by MS deleted. With reference to FIG. 11, the procedure is developed as follows: The network provides a new channel for handover once it completes a protocol stage that is highly dependent on the cause caused by the handover and the switching point. Have a message addressed to the new BSC containing all the information needed to do so. The new BSC, when operating as described above, has an indication of the assigned channels and everything the mobile needs to initially place in the new channel, even if it is not a perfect way in terms of timing and power levels. Send a handover command (HANDOVER COMMAND) via the MSC. This command
For this purpose the associated FACCH channel is used to be sent to the mobile by the old BSC to which it is still connected. The content of the handover command is B of the new cell.
TIME ADVANCE, including SIC, type of handover (in-system or out-of-system, synchronous or asynchronous), frequency and number of time slot used, and transmit power, but only known after synchronization And frame number (FRAM
E NUMBER) cannot be included. -The mobile temporarily abandons the old channel and the new channel TC of the new cell.
After switching to H, the mobile will use this channel for handover access (HANDOVE
R ACCESS) to send burst signals. This burst signal is 8 bits long and is similar to the signal already transmitted to the RACH channel by the mobile already associated with this cell, but unlike this signal it contains the handover criteria. -When the handover is synchronous and is performed until the PHYSICAL INFORMATION message is received, or when the handover is synchronous and the timer T312 is used.
When 4 cannot be counted, the HANDOVER ACCESS command is repeated 4 times. -The mobile unit has physical information (PHYS) independently transmitted by the new BTS on the FACCH channel.
ICAL INFORMATION) and ends the transmission of the handover access (HANDOVER ACCESS). This PHYSICAL INFORMATION contains the timing advance (TIMING ADVANCE) that the mobile must apply, and this timing advance (TIMING ADVANCE) is sent repeatedly after the BTS receives the HANDOVER ACCESS message. This handover access (HANDOVER ACC
The ESS message is a message in which the BTS can calculate the same HANDOVER ACCESS message. Level 2 when BTS reveals that it has received
When decoding a frame or a TCH block, the BTS uses the PHYSICAL INFOR
MATION) transmission is stopped. At this point, the mobile can fully synchronize itself to the new multiframe and adjust the timing advance and power level of the transmission.・ The mobile unit completes the handover to the new BTS on the FACCH (HANDOVER COMPLETE)
It sends a message and subsequently informs the old BSC that it can release the old traffic channels and associated signaling channels.

FIG. 10 shows, in a handshake form, a simple procedure showing a case where the handover fails, either synchronously or asynchronously. The actual handover command (HANDOV
ER COMMAND) message, if the mobile cannot receive PHYSICAL INFORMATION from the new BTS within the expected time, the mobile switches to the old channel of the old cell and re-establishes the call. Send a HANDOVER FAILURE message to initiate the Re-establishment procedure.

This concludes the description of the technical features of the GSM system which are considered to be more important for comparison with the present invention. From now on, we will limit some points that are considered to be drawbacks to the general CDMA method. Other points highlighted are equivalent to simply observing dissimilar features in the description of the embodiments. The authors would like to emphasize here that: -GSM's FDMA-TDMA method with 200kHz long range channels relies on multi-slot configurations that deviate from the standard architecture and require special channel planning. The bit rate for processing by a single user is 9.6kbit / s for data and 13k for voice.
Unless limited to bit / s, it is evaluated as not meeting future requirements for providing broadband services to users. -In GSM, the special shared access method and relatively low bit frequency do not set strict restrictions on synchronization. For this reason, a somewhat slower mechanism is expected in the search and hold of synchronization in idle and dedicated modes. In fact, synchronization is facilitated by the BTS with the release of FCCH and SCH copies in the downlink multiframe at intervals of approximately 45.6 ms. The synchronization of the mobile in dedicated mode is maintained by the BTS timing advance (TIMI
NG ADVANCE) Predicts the correction parameter emission. These synchronization mechanisms are based on TDD-type 3G systems [eg TD_SCDMA or TDD UTRAN (UMTS), which are characterized by sufficiently fast bit rates and very tight restrictions on the interference caused by too loose a synchronization.
Terrestrial Radio Access Network: UMTS Terrestrial Radio Access Network)]. This is because the access scheme anticipates more users sharing the same location so that asynchrony between multiple users sharing the same location can cause mutual interference. The GSM random access mechanism to the network is separated from the synchronization mechanism (which is essentially downlink before and during this step), so that no uplink synchronization at the same time as access is required. What is said does not seem so clear due to the lack of description of the 3G system, but it is important to proceed with this subject as it is relevant to the purpose of the invention. The subject matter raised is derived more from the advantages or disadvantages and from the different settings of level 1 between the two mobile systems. Different physical channel configurations cause 3G systems to have additional collision problems during random access to the network as compared to GSM, and problems that do not occur in GSM with asynchronous handover.・ FD realized by GSM
In D-type full-duplex access, the uplink / multiframe is the same as the downlink / multiframe, so there is a symmetric relationship between the number of traffic channels and the associated control in the two transmission directions. . This setting is not optimal for dealing with very unbalanced traffic situations, for example connections to the Internet where the route in use is indeed a downlink route. -Since the physical resources associated with GSM channels are fixed and cannot be changed, it is not possible to dynamically change the channel's ability to face changed traffic or message requirements. -The specific level 1 field is not predicted in the GSM burst signal that performs power control and timing control based on the burst signal. These functions are performed by keeping the SACCH channel busy at an interval of about 2 times per second that is too slow to eliminate Rayleigh fading but is suitable for eliminating only lognormal attenuation. Users should not share burst signals with other potentially equal frequency disturbances if good cell planning is in place, as power control in GSM reduces the average interference level "on average". To use. On the contrary, in 3G systems, the sharing of time slots and bands in the CDMA technique actually creates equal frequency disturbances. Therefore, higher speed and higher precision power control is required. In this regard, the degree of mutual interference is minimized by equalizing the power received from a single equal frequency user "one burst signal at a time," improving the reliability of the CDMA technique.

The CDMA approach just avoids the drawbacks of GSM highlighted above, in particular the low bit rate, the need to have precise frequency planning and the inability to manage asymmetric traffic efficiently. Preferred for third generation systems for reasons.
As already mentioned in the preamble, various companies in this area are growing with respect to third-generation systems, and the goals of the near future are described in great detail, as was previously done with GSM in a European environment only. It is the goal of a mutual agreement to produce a number of universally specified UMTS. Currently, the IS-95 standard is being implemented for CDMA systems, anticipating the use of 64 coded orthogonal sequences, also known as Walsh functions. In addition to these sequences, a pseudo-noise (PN) sequence is predicted, for example a "long code" for user identification, a pilot signal sequence PN transmitted by the base station for its own identification. Wals
The h0 function is used for the pilot signal channel. The remaining 63 Walsh encodings are used for call (paging channel) and speech (traffic channel) synchronization channels (Synch channels). Data format information content is W
Before being encrypted with alsh code and then spread spectrum modulated, the content is segmented by channel coding, interleaver and long code. The data rate at the encoder input can be in the range of 1200 bit / s to 9600 bit / s. All channels of the base station CDMA form a so-called "forward link", which is actually the signal transmitted towards the mobile device. In the opposite direction, the signal transmitted by the mobile differs from that of the base station with respect to the different channel coding and the type of modulation used (Offset-QPSK). The pilot signal train PN, which is synchronized with the pilot signal of the base station at the mobile receiver, is used again for spread spectrum modulation of the modulated data. Another characteristic that distinguishes mobile signals is that this last one does not transmit any pilot signals. Closed loop control of the transmission level between the base station and all mobile devices in operation is expected to compensate for the variability of attenuation due to different distances from the antenna and channel fading. With this control, the transmission power of all mobile devices can be adjusted in such a way that the signal strength at the input of the base station receiver has approximately the same level.

According to this specification, all channels share the entire band in a pure CDMA technique, ie a CDMA technique that does not further rely on other multiple access techniques. It is also of course expected to use different modulation types for the signals transmitted by the mobile and different channel coding compared to the signals transmitted by the base stations which maintain the same Walsh function. This also applies to full duplex. IS-95
It is clear that the system designated as is still far from being classified as the third generation system UMTS. In fact, the key requirements that must be met are the requirement for fast bit rates, especially when processing single channels, the possibility of asymmetric traffic on the two paths, and the possibility of dynamically changing the spreading factor. I'm not there. More normative FDMA
And the adopted full-duplex scheme, which does not fit into TDMA scheme, can cause crosstalk interference (crosstalk) between different channels. For mobile device synchronization, the transmission of the pilot signal PN does not require the burst signal and frame to be aligned with the loss of hierarchical frames, so it is likely that the known PLL mechanism is used to transmit the oscillator frequency of the mobile device and the bits to be transmitted. Correct the phase of. Furthermore, in the applicant's opinion, this specification is inadequate to establish all the complex issues of UMTS system architecture and signaling and feasibility that can truly compete with the current GSM, which always leaves a milestone for comparison. is there. To conclude with the system of specification IS-95, the specified system, even if it is a CDMA method, does not teach any teachings that are eligible to evolve towards a third generation system beyond the teaching given by the GSM system itself. Can be said to not even provide. It is not true that the manufacturer's needs are to reach new areas of standard.

It is a problem to be raised in the design of the third generation, and the answer to the condition of the selection of the design is specified below. -The first point is that GS provides means for enabling mobile devices to synchronize radio frames.
How it differs from M's instrument, which is still insufficient in the new relationship. -The second point is how, in the case of a handover, the mobile device adopts a new synchronization means in the protocol step in anticipation that the mobile device will access the radio frame of the serving cell or the neighboring cell.

Given the complexity of the problem being addressed, it is not possible at this point in the description to predict in a more accurate way the technical problem the invention is to solve in its original way. While proceeding with the description of the specific examples, these technical problems will be fully and clearly emphasized to fully justify the solution realized by the present invention.

OBJECT OF THE INVENTION The scope of the invention is therefore to show a process for coordinating access to a shared radio channel, which process is carried out on a physical channel by system selection in the radio interface of the new system UMTS. Along with the time and power synchronization modes that are enabled, it avoids dangerous congestion on the channels shared by mobile devices when performing network access in a procedure that anticipates access to the network.

SUMMARY OF THE INVENTION The main object of the present invention is the process of coordinating access to a radio channel managed by a base station belonging to a UMTS type mobile telecommunication network as claimed in claim 1.

Further objects of the invention are two additional preferred embodiments of the process as claimed.

An additional object of the invention is a mobile system implementing the access coordination procedure of claims 1 and 2 of the preferred embodiments.

ADVANTAGES OF THE INVENTION The process of claim 1 allows a CDMA system, in particular a TDMA-CDMA system of the present invention, by virtue of the introduction of respective dedicated sub-channels of different access topologies,
It provides the ability to coordinate access to mobile devices on shared channels. This alleviates the risk of congesting the uplink path at the peak of the connection request to the network for all modes envisaged in the system, such as outgoing call, closed call and asynchronous handover between cells. There may be more than one way to assign subchannels to different access topologies. Three of these methods will be described later, the first method also corresponding to a preferred embodiment of the invention, the remaining two
One method corresponds to the other two preferred embodiments. The first allocation method is based on the official use of marking (marking) TDMA multi-frame frames at regular intervals and assigning frames at different positions within the marking period to different subchannels. , Each subchannel is associated with a particular access topology. On the contrary, the second sub-channel allocation method performs access according to the access topology of the acknowledgment procedure (acknowledgement) transmitted to the mobile device in the cell to perform access to the network. This embodiment may be useful in the steps following the mobile device's access to the network, but may also be useful from a future development perspective. The third sub-channel allocation method combines the two methods described above to produce synergy.

The invention, together with its further objects and advantages, can be understood by the following detailed description of embodiments with reference to the drawings.

Detailed Description of the Preferred Embodiments FIG. 11 (the previous one has already been described) shows an ordered arrangement of seven time intervals or time slots within a 3G frame, which will be described later in the other three. Two special time slots are also shown, and these time intervals or time slots repeat indefinitely between those in use in the cell for use on common carriers (GSM for wideband use). Much less than the time slots used in. The basic frame of FIG. 11 is a TDD-type full-duplex system realized in a 3G system, in which m time slots UL ⁰ , ..., UL ^m (UpLink) coming from a mobile device MS, and It contains n time slots DL ⁿ , ..., DL ⁰ (Downkink) coming from the BTSC. The set of carriers and their utilization time slots and spreading codes form the physical channels of the Uu interface that are intended to support the information that characterizes the channel from a logical point of view. Consecutive frames are organized into more hierarchical levels observed by all carriers used in 3G systems. The carriers transmitted by the BTS carry frames that are synchronized with each other, which simplifies synchronization between adjacent cells. Without limiting the present invention, the TD_SCDMA system (Ti
It is convenient to perform general frame synchronization between all cells of different clusters that characterize the 3G system as meDivision Synchronous Code Division Multiple Access. That is, starting from the bottom to the top in this figure, the basic frame 3G contains m + n = 7 useful time slots in addition to the other three special time slots, each of these useful time slots having a duration of 0.675 ms. Has three special time slots sequentially with a DwP of 75 μs duration.
The TS time slot (downlink pilot time slot), the guard time GP of 75 μs, and the UpPTS time slot (uplink pilot time slot) of 125 μs duration. The total duration of the basic frame is 5ms. The 24 basic frames 3G form one 120ms traffic / multiframe. The 48 basic frame 3Gs form a 240ms control multi-frame 3G. 24 x 48 = 1152 basic frame 3G
Forms a superframe 3G with a duration of 5.76s. 1152 frames can be derived from either 48 traffic frames or 24 control frames. The 2048 superframes 3G form one hyperframe 3G consisting of 2,359,296 frames 3G with a total duration of 3 hours 16 minutes 36 seconds. A comparison between FIG. 3 and FIG. 11 shows that the GSM system and the 3G system employ different values that are very close to how the time division orders differ. The hierarchy shown is not binding, for example the signaling opportunity has two consecutive basic frames of FIG. 11 with a total duration of 720 ms 72.
It can also be considered as two subframes of one new frame belonging to one multiframe consisting of the new frame and having a double duration.

In the 3G basic frame, the guard period GP represents the switching point DL / UL. The guard period GP avoids interference between uplink transmission and downlink transmission,
And used by the mobile station to absorb the propagation delay between the mobile station and the base station when transmitting the first signal on the UpPTS channel, at which stage the propagation delay is unknown. is there. Just before the guard period GP, there is a special DwPTS time slot, U
Immediately after the pPTS time slot, both time slots have a sync burst signal that is not subject to code spreading, the function of which will be described later. The remaining time slots contain burst signals with the same structure that are destined for traffic or signaling, subject to code spreading. Figures 12a, 12b, 12c show different configurations of the basic frame 3G, the first two figures relating to the configuration with higher symmetry with respect to the remaining figures. FIG. 12a shows the basic frame of FIG. 11 at different time positions within a multi-frame, in particular the starting point of UpPTS, followed by 3 in sequence, Ts0, Ts1, Ts2.
4 uplink timeslots, then 4 downlinks timeslots
Ts3, Ts4, Ts5, Ts6, and finally DwPTS and guard time GP follow. Time slot Ts
There is a switching point UL / DL (different from the above switching point) between 2 and Ts3. Figure 12b shows a fully symmetrical arrangement of three effective time slots in two directions, and a downlink Td6 time slot available for signaling, while Figure 12c shows two uplink time slots and the Internet. Figure 6 shows an asymmetrical arrangement with 4 downlink timeslots more suitable for connection. In FIG. 12a, the duration of the different effective time slots corresponds to the common frequency of the set of N code sequences used in the effective time slot performing spread spectrum according to the CDMA technique.
It is represented by a unit of measure called a chip with a duration of 0.78125 μs equal to the reciprocal of 1,28 Mcps. FIG. 12d shows downlink pilot time slot DwPTS
Includes a guard period GP of 32 chips and a SYNC1 row of 64 chips following the guard period GP. Figure 12e shows SY with 128 chips for Uplink, Pilot and Timeslot UpPTS.
It indicates that the NC1 column and the 32 chip guard period GP following the NC1 column are included. And finally, FIG. 12f shows that the common structure of the effective time slots Ts0, ..., Ts6 has a guard period GP of 16 chips at the end while the common structure of the total of 864 chips, and before and after the midamble of 144 chips respectively. It is shown to contain two fields of equal length of 352 chips for the data to be placed.

Each of the two fields given in FIG. 12f is modulated by a preset number of code sequences to produce an equal number of radio channels within the band of spread spectrum, these channels being distributed over this band. RUs, which represent the same number of so-called resource units RU (Resource Units) that are placed when processing services and signals. The neighbor midamble contains the training sequence used by the BTSC station and mobile device to evaluate the impulse response of the number of radio channels generated for the purposes described below.

Referring to the main burst signal of FIG. 12f, the following relationship holds: T _s ^k = Q _k
× T _c , where Q _k is a spreading factor SF (Spreading Factor) freely selected from 1,2,4,8,16 corresponding to the N code strings, and T _s is transmitted. Is the duration of the symbol and T _c is the fixed duration of the chip. From this relationship, increasing the spreading factor also increases the duration of the transmitted symbol, in other words increasing the physical channel associated with the main burst signal, but decreasing the transmission rate allowed on this channel.

Appendix APP2 shows two tables summarizing the above ideas. Table 1 shows the number of symbols obtained from each data field of the main burst signal of Fig. 12f for different spreading factors of the columns of CDMA modulation. Table 2 shows the approximate data rates for different RU _{SF1 ... 16} . Given the information given, we use the generalized spreading factor equal to 16 in the frame of FIG. 12a, each of the 7 valid time slots carries 54 symbols, with 10 UpPTS symbols and 6 Note that the DwPTS symbols and the equivalent symbols for the 6 GP periods are added up to give a total of 400 symbols.

Before describing the use of physical channels, it is worth starting with the radio frequency spectrum and completing the information characterizing these physical channels from a radio perspective. The frequency band available for 3G systems can be allocated around 2 GHz and has a variable width depending on the availability of the spectrum. In particular, the available area is currently included in 1785MHz to 2220MHz in a discontinuous band with a width distributed from 15 to 60MHz, so it is possible to coexist 3G services with services provided by other systems. . Table 3 of Appendix APP2 is shown in Figure 12f.
The main modulation parameters of the burst signal are shown. The spreading sequence that modulates the data (symbol) is the sequence known as the Walsh (n) function. With respect to the assigned spreading factor SF, it is possible to choose from the Walsh functions different Walsh functions SF which are all orthogonal and have the possibility of free assignment to mobile devices within the same time slot.
In the burst signal of FIG. 12f, up to 16 possible users sharing one time slot can be identified at the midamble level without code spreading. For this purpose it is useful to cyclically phase shift the sign of the base period sequence for multiples of minimum shift width to obtain up to 16 different versions of the same midamble (in a known way). I knew it was. The last important operation left to consider is
Scrambling, which is the multiplication of the elements in each column that results from the spreading process by the regular scrambling sequence (mixing) of cells. Scramble gives the pseudo noise characteristic for the columns to which it is applied. The spreading-> scramble operation can be compared to the application of spreading code characteristics of the cell. Recognition of the particular combination of spreading code and scrambling code assigned to the RU allows the signal to be transmitted to the radio interface Uu, and the received signal undergoes descrambling and despreading inversion to produce the original signal. Allows to reconfigure. A similar approach applies to the midamble.

Next, FIG. 13 shows sharing criteria of the following elements (entities) in different cells of a 3G system: a SYNC sequence of a burst signal DwPTS, a scramble code, a midamble, and a SYNC1 sequence of an UpPTS burst signal (signature and Refer to the standard for sharing. Referring to FIG. 13, DwPTS1, ..., DwPTS32 are also assigned to the SYNC code.
We can see a table divided into 32 horizontal lines. Assuming only one carrier per cell, a group of 32 SYNC codes indicates 32 cells, otherwise it indicates a smaller number of cells, and the last criterion is for 3G systems. It is a criterion for predicting as many DwPTS pilot signals as there are carriers or, if necessary, one cluster of the plurality of clusters. As shown in this figure, one scramble code group consisting of four scramble codes out of a total of 32 groups and 128 codes that are assigned in numerical order is
Related to PTS. Each of the four groups of midambles is associated with each of the 32 scrambling code groups out of a total of 32 groups, 128 midambles, which are allocated in the same numerical order of the scrambling codes. Only one of the four midambles is selected and its SF (
Versions (up to 16) are delivered as above when needed.

FIG. 14 shows the sharing criteria between different cells of the 3G system of the signature sequence SYNC1, each signature sequence corresponding to the content of the uplink pilot time slot UpPTS.
As can be seen from the table in the figure, there is a correspondence in these lines with the table in the previous FIG. 13, and again in this case each line is identified by a total of 32 carriers' own DwPTS pilot signals. Carrier (cell). 8 different columns SYNC
One group of 1 is associated with each of the 256 downlink pilot signals DwPTS assigned according to the sequence of figures. As shown, the mobile device randomly selects one of the eight columns SYNC1 associated with the pilot signal DwPTS having access to the network through the cell identified by the given pilot signal. The legends in the figure indicate the lengths of the different elements of the two tables.

The different time slots of the basic frame of FIG. 12a are, needless to say, a single BTSC.
Received some beam formation by the resident intelligent antenna. The time slot undergoing beamforming is associated with a set of complex beamforming constants used for spatial or space-time filtering performed by the BTSC on the transmit and receive time slots.

The elements (entities) introduced so far, that is, the band allocated to the system, the carrier frequency and its distribution between different cells, the structure of the basic frame and the frame hierarchy, the pilot / time slot DwPTS, UpPTS and the effective time slot Structure, scrambling code, midamble and associated time shifts, number of spreading codes, beamforming constants, and other information that briefly describes physical and logical channel formation, etc. Form the framework on which the system is based. This information generally characterizes Level 1 of the protocol and also inputs in whole or in part semi-permanent data assigned to different BSCC and BTSC posts scattered throughout the area. A mobile that is roaming or idle always puts it in a “location area”, especially when it is semi-permanent (frequency, DwPTS, basic midamble, scramble code, UpPTS group). ) Is associated with the cell that must be known. A suitable system message is the remaining elements (midamble shift code, spreading factor and spreading code, beamforming constant, transmit power, etc.) that better compose the channel allocated in provisional mode for the connection containing the radio interface Uu. Fulfills the purpose of being integrated with a subsequent "ASSIGNMENT" message to assign a timing advance.

The DwPTS and UpPTS elements and the midamble element are described in more detail below, given their importance within the 3G system. The pilot signal DwPTS is transmitted by a general BTSC station without beamforming or with sector beamforming, which also causes the mobile to perform a cell selection procedure when it switches from off to on. It can be so. For this purpose, the mobile shall subscribe itself to the relevant cell and proceed with the synchronous downlink scanning to identify the DwPTS pilot signal received at the highest power, in order to proceed to the reading of the advertised system information. In order for the mobile to start, all frequencies used in the 3G system and the corresponding pilot signal DwPTS are stored in the mobile's nonvolatile memory SIM (Subscriber I
dentity module: stored in the subscriber identification module). In this way, the mobile knows the basic midamble used in the cell and the scrambling code associated with it. The discrimination of the DwPTS pilot signal is performed by checking the coefficient once S
Requires the use of a digital filter programmed to be coupled into the YNC string. During synchronization, a frequency tracking algorithm capable of removing the frequency offset from the received signal can be activated. Other functions imposed on the downlink pilot signal DwPTS are briefly outlined for brevity,
It is an instruction to the mobile unit about the start position of the common control primary channel (CCPCH) and the interleave period for acquiring the wireless synchronization of the adjacent base stations and the advertised system information. This last function can be obtained in various ways known to those skilled in the art.

On the other hand, the uplink pilot signal UpPTS is initiated by the mobile device first and follows the cell selection phase into the subscription procedure (location update) and then at the first and additional random access to the network. , Cell reselection procedure and asynchronous handover. Mobile has 8 queues to send on the uplink
It randomly selects one of SYNC1 and starts its transmission. 8 in 1 group
Since all two columns are orthogonal to each other, they can be transmitted simultaneously by the same number of mobile devices and discriminated by the base station BTSC without interference. The above applies to all 256 columns. Recognizing a single SYNC1 sequence, the BTSC station measures the associated delay and received power level and uses the appropriate physical channel P-FACH (described below) to limit the delay to a single frame. Use this to send an access timing adjustment message (Timing Adjustment) to the mobile using a single burst signal. This adjustment value is used by the mobile to send the next message. The start power control and synchronization reduce the total interference on the channels assigned by the network according to the SYNC1 column. When the mobile receives from the network a tailored response to the transmission of the SYNC1 sequence, the pilot signal UpPT
Stop sending S. Retaining synchronization and correct transmit power when allocating dedicated channels is left to the use of the midamble.

A unique base midamble is a maximum of 16 midambles specified by as many coded shift time values as there are different versions of a burst signal that can co-exist in a time slot at the same time for maximum spreading value SF. Can be generated in one cell. The midambles are given the same beamforming and the same transmit power of the data present in the burst signals that accommodate them. The code that specifies the midamble is
It is the code of the learning sequence for evaluating the impulse response of the associated radio channel.
Midamble related functions are: -Radio channel estimation. This is done by both the mobile and the BTSC for the received signal. That is, since a BTSC station receives a phase-shifted version of the same midamble in one time slot, it will be able to generate a given impulse response associated with radio channels engaged by different mobile devices in a single correlation cycle. Within
Known consensus estimation methods can be advantageously used in this method, which are obtained sequentially at the output of the correlator. -Measurements for power control. Signal / interference radio power measurements are made on both the uplink and downlink to measure transmit power. It uses a mechanism based on an inner control loop, which is very fast as it is driven by the first sample of the impulse response and is performed by a slower outer loop based on quality measurements. Level 1 is expected in the main burst signal due to the assignment of commands to the transmitter which allows a fast inner loop. -Maintaining uplink synchronization. The BTSC station computes the midamble discrimination point in time relative to its own time base and compares this point with the previous corrected value, which difference is the correction of the first transmission point of the next burst signal. Is the new TIMING ADVANCE value sent to the mobile for The accuracy of the uplink transmission is 1/8 of the chip duration, and a level 1 field is expected in the main burst signal due to the assignment of commands to the transmitter, which allows rapid control. -Frequency offset correction. This is a procedure performed only by the mobile device in the downlink direction while recognizing the midamble.

FIG. 12g shows a possible configuration of the main burst signal of FIG. 12f in which two L1 level 1's are placed just on either side of the midamble. Each of these two L1 fields is adjacent to an additional field that is scheduled together with the SACCH channel described below. Table 4 of Appendix APP2 shows the meaning of the L1 field of FIG. 12g, and the position and size in the burst signal. The display in the third column means the diffusion coefficient 16. This table contains three 2-bit fields called PC, SS and SFL. The fields PC and SS contain commands communicated to the transmitter to perform power control (PC) and synchronous shift (SS) functions. Field SFL is a steal flag used in the same manner as GSM, where the first bit of the SFL symbol controls the paired bits of the burst signal of FIG. 12g, while the second bit controls the odd bits. If the value of the control bit is set to "1", the corresponding pair bit or odd bit of the burst signal carries the higher level signal, otherwise this burst signal corresponds to the corresponding pair bit. The bits or odd bits carry, for example, audio data. The SFL value is constant during the whole interleaving along N frames and is service dependent. The total of 6 bits of the fields PC, SS and SFL is equivalent to 96 chips (6 symbols). The remaining 304 chips for the data field use up the capacity of the burst signal, so four symbols for the SACCH channel must be included in this data. The following Tables 5 and 6 show that the minimum step Pstep is ±
To 1 dB and related commands considering that 1 / kt _c is 1/8 of the chip time T _c
The bit mapping of OC and SS fields is shown.

Now, with reference to Table 7 of Appendix APP2, we examine the physical channels corresponding to the Level 1 elements described so far. This table shows the mapping of logical channels to physical channels. It is also worth making a comparison with the corresponding GSM channels to highlight the differences in Level 1. The physical channels emphasized in Table 7 are DPCH (Dedicated Physical CHannel) and P-CCPCH (Pri
mary-Common Control Physical CHannel: primary common control physical channel) and S-CC
PCH (Secondary-Common Control Physical CHannel), P-RACH (Physical Random Access CHannel), and P-FACH (Physical Forward Access CHannel)
Channel) and PDPCH (Packet Data Physical Channel). The logical channels that can be mapped to the above physical channels are:
They are shown in the table under the names below. That is, TCH (Traffic CHannel) and SACCH (Slow Associated Control CHannel), FACCH (Fast Associated Contrl CHannel: high speed related control channel), BCCH (Broadcast Control CHannel: public relations control channel), PCH (Paging
CHannel: Paging channel), AGCH (Access Grant CHannel), optCH (Optional CHannel), COCH
(COMMON Omnidirectional CHannel), RACH (Random
Access CHannel: Random access channel), FACH (Forward Access CH)
annel 1 burst: Forward access channel, 1 burst signal, PDTCH (Pack
etData Traffic CHannel: packet data traffic channel), PACC
H (Packet Associated Control CHannel).

The two specific physical channels of the 3G system are without a doubt two pilot channels.
Time slots DwPTS and UpPTS. Of these, the downlink pilot signal DwPTS supports GSM SCH and FCCH functions in the new situation, except that it does not have a frame number TDMA and is therefore routed by advertised system information. Performs a function similar to that of a burst signal. On the other hand, the uplink pilot signal UpPTS is not suitable for GSM because it is more suitable for TDD frames. As we have seen, the mobile device is carried by the UpPTS to have the time and power synchronization of the signal normally sent in the next message on the random access channel RACH to request the allocation of a dedicated channel. Will be forced to use the signature SYNC1. The time and power synchronization requirements occur on the first access to the network and later provide the midamble when the network assigns a dedicated channel to the mobile (UE). So until that time the SYNC1 row is needed. Therefore, the access and synchronization mechanism differs from GSM only with respect to the different physical settings of the 3G system. In GSM, the time and power synchronization before the dedicated channel is not predicted because the requirements on the degree of interference allowed are not strict and there is no equivalent uplink in the SYNC1 column. The correct dynamics are found in the application with reference to Figures 18, 19 and 20. It is worth emphasizing here that before the first access to the RACH channel or dedicated channel, during the handover, the SYNC1 sequence until the mobile device gets an acknowledgment from the network via the channel P-FACH. , And that this sequence can be sent once again (except for handover) just before switching on the dedicated channel.

With respect to what has been said above, the access mechanism with the code SYNC1 works by repeating this mechanism and because it works during the first and second parts of the channel formation procedure.
It can be argued that there is also a significant fear of collisions on the PTS, which is the fear that the system has 8 different SYNC1s orthogonal to each other for the channel.
Is only partially mitigated by providing However, in a broadband system like 3G, as opposed to a narrow band like GSM, much less carriers are needed per cell (even just one), so May be insufficient. This means that during normal telecommunications traffic service, a much higher number of access requests will be received on the carrier of the 3G system than on the carrier of GSM. Therefore, the probability of collisions on the UpPTS channel remains and this probability must be eliminated in order not to cause the user the annoying inconvenience of longer or shorter delays in call setup. The method of the present invention only adjusts the random access to the network made by the transmission of the column SYNC1 to radically reduce the probability of collisions caused by using the columns described above in UMTS systems such as 3G. Target. The anti-collision method envisaged in GSM is still applicable to the transmission of sequence SYNC1 as just foreseeed in the above recommendation, continuing to coexist on the RACH channel, and subject to the constraints imposed by the invention. The method of the present invention
It is not affected by the methods envisioned above in GSM.

Continuing with the description of the physical channels in Table 7 of Appendix APP1, the primary channel P-CCPCH is allocated, for example, just before the pilot signal DwPTS in the downlink time slot 6 (see FIG. 12a). The channel P-CCPCH uses two resource units with a distribution coefficient of 16. This channel has a fixed radiation pattern, which can be omnidirectional or can be given limited beamforming to give the cell a predetermined shape. The minimum shift value of the midamble is always associated with the channel. Primary channel P-CCPC
H carries the higher level 23 information bytes to provide information on other common control channels.

The secondary channel S-CCPCH can be freely allocated in all downlink time slots. The S-CCPCH channel uses two resource units (resource units) having a distribution coefficient of 16 and can perform omnidirectional or adaptive variable beamforming.

The P-RACH random channel can be assigned to one or more uplink timeslots whose numbers depend on the expected traffic and also carry mobile device messages with service channel assignment requests. Used to The spreading factor is always 16, and omnidirectional or adaptive variable beamforming can be performed. It partially contains Level 1 information.

The P-FACH direct channel is freely configurable in all downlink timeslots. The spreading factor is always 16 and can undergo omnidirectional or adaptive variable beamforming. It partially contains Level 1 information. This channel P-FACH carries the network's response to each correctly represented column SYNC1. This response message is provided in a single burst signal to limit the delay to a single 5ms basic frame. The network acknowledges, via the response attached to the P-FACH channel, to the mobile station which transmitted the sequence SYNC1, the sequence identifier received and acknowledged,
And, possibly, the correct forward and power level indicator identifiers used to transmit the next message that is likely to be a service request message on the P-RACH channel. Access to the network via the SYNC1 column determines how to assign the mobile device to the channels P-RACH, P-FACH and P / S-CCPCH (AGCH in this case) coming into the next phase immediately. Including that at the same time. With this mode definition, we have to face a somewhat different aspect than a collision. In practice, more than one of the above channels can be configured for each cell, so the mobile device will start from which of these channels to the previous column SYNC1 (or respectively to the channel request).
It has a problem of deciding whether to wait for the network response. The answers to the problems presented here, which have the advantage of avoiding signal delays due to the systematic reading of system information, are set out in a recent patent application filed in the name of the applicant. The solution presented here is essentially equivalent to the SYNC1 → P-FACH → P-RACH → P / S-CCPCH link, which produces the following type of link: SYNC1 → P-FACH → P-RACH → AGCH. In particular, this is subject to the following constraints: -This mapping must associate each of the eight SYNC1 sequences with one channel P-FACH. Each P-FACH must be the destination of at least one SYNC1. -The P-FACH to P-RACH mapping shall generate an association with the constructed P-RACH. Each configured P-RACH must be the destination of at least one P-FACH. -The P-FACH to AGCH mapping shall generate an association with the constructed P / S-CCPCH. The channel P / S-CCPCH carries AGCH. Each configured AGCH must be the destination of at least one P-FACH mapping.

The information defining the different predicted links is included between the advertised system information so that the links are known by the mobile and the network even before establishing the connection. Table 8 in Appendix APP2 shows group and channel P-FACH in column SYNC1.
An example of such a connection with and is given. As you can see from this table, the channel P-FACH
Increasing the number of time slots used by the result will increase the SYNC1 group and reduce the number of elements in a single group on average. Having established a link similar to the expected link allows the mobile to get a response from the network and advantageously make a proper connection.

The physical dedicated control channel DPCH is shown in FIG. 12g at both ends of the midamble,
And two fields L1 located in adjacent fields reserved for the SACCH channel. There are bidirectional channels that are beamformed. Figure 12g
The burst signal structure of is unsuitable for use during access to the network,
Characterized by the intensive use of PC and SS commands towards different mobile devices, this task is performed by the physical channel P-FACH using the entire burst signal.

The channel PDPCH has the same structure as the DPCH dedicated channel, and has level 1
The meaning of the fields is clearly changing.

The logical channels mapped to the physical channels in Table 7 will now be described. These channels are also referred to as transport channels because they carry the blocks supplied by the higher levels of the protocol to the physical level of the air interface. From a functional point of view, the logical channels in Table 7 are grouped as shown in FIG. Referring to the figure, the following three main groups: TRAFFIC CHANNELS (
TRAFFIC CHANNEL, CONTROL CHANNELS, and PACKET D
ATA CHANNELS (packet data channel) can be recognized. CONTRO
The L CHANNEL group has the following channel types: BROADCAST CHANNEL (public information channel), COMMON CONTROL CHANNEL (common control channel) and DEDICATED CONTROL.
Including CHANNEL (dedicated control channel). This breakdown can be read from this table, where TCH / F is TCH full rate, TCH / H is TCH half rate, and optional channels are NCH (Notification CHannel) and CBCH (Cell Broadcas).
t CHannel). All channels called BROADCAST CHANNEL are also classified as omnidirectional (COCH). Although there are some similarities with GSM channels, the correspondence is not exact and there are differences at the functional level, which are generally different at the physical and mapping levels. The following description includes functional aspects and mapping methods, starting with a dedicated channel: TCH (Traffic CHannel). These are bi-directional channels that carry encoded voice or data generated by the user in circuit-switched mode. Two types are available, full rate TCH / F and half rate TCH / H. The entire payload is mapped onto the physical channel DPCH which is not used for the Level 1 signal and the SACCH channel. It is possible to map one RU _SF8 , or one or two RU _SF16 . For fast data rates
TCH channels can be combined. These are beamformed. FACCH (Fast Associated Control CHannel). This relates to the traffic channel in bit steal mode as already mentioned. It is mapped by allocating 23 bytes to one or two interleaved frames. It is used to transfer some urgent and important information, such as handover information. This channel is an RR connection (Radio Resorce:
A bidirectional radio link unique to the radio resource) but which may be duplicated temporarily due to handover, consisting of at least one uplink RU and one downlink carrying a FACCH channel, the so-called primary It is also called the main DCCH (Dedicated Control CHannel) because it forms the skeleton of the signaling link. SAC
The CH is part of the main signaling link, and the TCH channel can also form part. SACCH (Slow Associated Control CHannel). It is used by networks and mobiles to transfer non-urgent and non-critical information, such as measurement data, related to the traffic channel TCH. It allocates 23 bytes to 24 5ms frames and maps them to each TCH burst signal.
There are four symbols for the SACCH channel. FIG. 16 compares a 120 ms GSM26 frame traffic / multiframe to a 120 ms 24 frame 3G multiframe. The top line shows the six 260 at the output of the speech coder common to the two systems.
Bit blocks are mapped. As can be seen from the figure, there are two unused TCH frames that can be placed in the processing of the SACCH channel in GSM. In particular, the 26th frame is used to perform measurements on short range BTS stations with no voice or data loss. This kind of frame doesn't exist in 3G system,
Therefore the channel SACCH must be mapped into each TCH. -BCCH (Broadcast Control CHannel). It spreads system information in the cell on the downlink in PR mode. The channel BCCH is mapped to the two RU _SF16s of the physical channel P-CCPCH. The BCCH channel shares the spaced frames of the physical channel with the PCH channel or other common control channels. The column modulation of the pilot signal DwPTS indicates the start of the interleave period of the channel P-CCPCH including the BCH channel (public information channel). The layout of the physical channel P-CCPCH is signaled system information. Table 9 of Appendix APP2 shows common control channels BCCH and PCH of multi-frame consisting of 48 control frames.
Shows an example of multiplex with. For this purpose, multiframes are subdivided into spaced blocks of four basic frame lengths. Unique system information (SYST
EM INFORMATION) message on a configurable BCCH channel at a preset location for the system frame number SFN. -PCH (Paging CHannel). It sends a paging message on the downlink to the mobile device. It can have either an omnidirectional radiation pattern or a beamformed radiation pattern. P-CCPC
Its mapping to H or S-CCPCH is indicated in the system information carried by BCCH.
AGCH (Access Grant CHannel). It is used by the network in the downlink to send a response to a previous channel request message that the mobile has sent on the P-RACH channel whenever the message is correctly represented and received. PF that carries these responses to SYNC1
Note the difference with ACH. -CBCH (Cell Broadcast Channel). This is the channel used for the SMSCB service (Short Message Service Cell Broadcast). -NCH (Notification CHannel). This is the channel used to announce the call of the conference type mobile device. -RACH (Random Access CHannel). this is,
Used by the mobile device to send a service channel request message. P-
Its mapping to the CCPCH is indicated in the system information carried by the BCCH. -FACH (Forwadr Access CHannel). This is SY
Used by the network to send power control (PC) and synchronous shift (SS) commands to mobile devices as an immediate response to NC1's transmission. PDTCH (Packet Data Traffic CHannel). These carry packet switched data.・ PACCH (Packet Associated Control CHannel)
. These carry signals related to packet switched data.

In 3G systems, it is not possible to follow the same approach used by GSM systems to size and allocate logical channels. In the GSM system, each downlink / time slot is combined with one uplink / time slot, so there is a natural connection between all logical channels that share a combination of multiple channels in a given time slot / multiframe. Be seen. This fact is due to the fact that in order to associate the PCH channel with the RACH channel and the RACH with the AGCH, the GS
Used in M. If a combination of channels exists in more than one time slot within a cell, there are ways to distribute mobile devices between these channels for the purpose of sharing the load. In 3G systems there is no emphasized type of natural connection, so
Similar connections between control channels are established via that definition. The publicized system information will include traces of agreed regulations. The control channel under consideration represents an allocation set called CCHset (Control CHannel Set). Two or more CCH pairs can be configured in the 3G system. Figure 15 shows one 3G 5ms
The possible layouts of CCH sets and P-FACH channels in a basic frame are shown.

FIGS. 18, 19 and 20 are message order diagrams showing some application examples of all concepts provided to date on 3G systems. These figures refer to the same number of procedures using the means and teachings that characterize the present invention. The procedure described is a relatively important one of those foreseen at the interface Um. For the purposes of the present invention, the following messages: BCCH, Handover (HANDOVER), Command (COMMAND), Immediate Assignment (IMMEDIATE ASSIGNMENT), Uplink Free (UPL)
INK FREE) applies the criteria that are problematic according to the criteria. The moving body is VGCS (
Voice Group Call Service: Send the last message (not described above) in the uplink access procedure for the channel. This message causes the MS to match the sync state and power level and initiate an immediate allocation procedure, which will be briefly described later. The SYNC1 burst signal is transmitted prior to the UPLINK FREE message, and the base station BTSC responds to this burst signal and performs the downlink transmission of the PHYSICAL INFORMATION message.

18 and 19 refer to an outgoing call from the mobile MS and a termination call for the mobile MS, respectively. In these figures, all components (entities) (BTSC, BSCC, MSC) that are different from the mobile MS are shown in the general term network (NETWORK),
It is also possible to specify the relevant physical component or protocol component. The procedure of these two figures is similar, both resulting from the mobile's idle (standby) state, in which the mobile sends a paging message sent by the network on the PCH channel. Monitor. Entering the first procedure rather than the second procedure means that the mobile requests a channel,
It relies on identifying it as voluntary rather than directed by the network. The steps that come after entering one or the other operational phase are immediate assignment (
IMMEDIATE ASSIGNMENT) procedure, and the purpose of this procedure is to establish an RR (Radio Resource) connection between the mobile station and the network. From this point, the following description applies to both figures, but with immediate assignment (IMMEDIATE ASSIGNME
Before starting the (NT) procedure, the mobile shall obtain the following information from the so-called system information contained in the P / S-CCPCH channel: a map between the SYNC1 code and the P-FACH channel ( Map), P-FACH channel and P
-Map to and from the RACH channel, Map to and from the P-RACH channel and AGCH channels configured in the P / S-CCPCH channel; -Uplink interference level on the uplink pilot signal UpPTS; -P-CCPCH Level of transmit power of channel; -System frame number SFN; -Next control parameter of random access; 1. Increase the power level in each transmission of SYNC1 PSTEP; Some parameter values are shown collectively as "access parameters", and in accordance with the teachings of the present invention and other preferred embodiments of the present invention, enable scheduling of an access subchannel UpPTS _SUBCH for transmitting a SYNC1 burst signal. Do; 3. Maximum value for retransmission of SYNC1 burst signal "M"; 4. Number of frames during retransmission of two SYNC1 burst signals "Tx-integer"; Value of control access parameter "CELL_BAR_ACCESS"; 6. Allowed access classes "AC" and "EC";

This IMMEDIATE ASSIGNMENT procedure can only be initiated by the mobile's RR component. The initialization is triggered by a request of the sub-level MM, or is triggered (activated) by the LLC (Low Layer Compatibility) level to enter the dedicated mode, or a call request (PA
GING REQUEST) triggered by the RR component in response to the message.
If access to the network is granted during such a request, the mobile's RR
If the component initiates the immediate assignment procedure defined below and access is not granted, this RR component rejects the request. The request to establish the RR connection from the sub-level MM specifies the "cause of establishment". Similarly, a request from a RR component to establish an RR connection in response to a PAGING REQUEST 1, 2 or 3 message causes one of the causes of establishing a "reply to call". specify.

Every mobile station that inserts a SIM card is a member of one of ten access classes numbered 0-9. This access class is stored in SIM. In addition to this, the mobile station can be a member of one of the five special access classes (11-15) stored on the SIM card. If an emergency call to all mobile devices in the cell, or only to members of a special authorized access class, is allowed, the system information message on the BCCH channel in transit will not allow access. Publicize a list of specials in the approved classes. If the "cause of establishment" for a sub-level MM request is not an "emergency call", then only if the mobile is a member of at least one access class or authorized special access class, Generate access for. Conversely, if the "cause of establishment" is an urgent call, then only if the urgent call is allowed to all mobile devices in the cell, or if the mobile is at least of a special authorized access class. Allow access to the network only if you are a member.

Points 3-6 above relating to the parameters “M” and “Tx-integer” together with the access classes mentioned describe the mechanism for limiting collisions on the RACH channel in GSM. These mechanisms essentially consist in prolonging the random access attempts performed by the mobile in time to limit the number of random access attempts and not overload the channel. When this mechanism is found to be inadequate, such as during peak traffic times, an access class mechanism is activated to selectively and temporarily block access to the network leading to a group of users. As will be explained later, these random access coordination mechanisms differ significantly from the mechanism implemented by the present invention in that the results are complementary. Once the access requirements are met, the mobile PR
The M protocol component initiates an IMMEDIATE ASSIGNMENT procedure that schedules the transmission of the SYNC1 burst signal onto the physical channel UpPTS in an appropriate manner, resulting in idle mode (especially ignoring call messages). Get out of. The mobile then sends M + 1 SYNC1 burst signals on the UpPTS channel to: _-a SYNC1 burst matching the access subchannel UpPTS _SUBCH determined by the access parameters _envisaged by the invention. Signals are sent selectively; -The number of frames between the start of the immediate allocation procedure and the first SYNC1 burst signal (excluding the burst signal itself) indicates this with each new start of the immediate allocation procedure. A number, which has a uniform probability distribution within the set {0,1, ..., Tx-integer8-1}; the number of frames between two consecutive transmissions of SYNC1 is Is a minimum allowable value according to the scheduling executed according to the preferred example of FIG.

After transmitting the first SYNC1 burst signal, the mobile starts monitoring the corresponding P-FACH channel and displays a PHYSICAL INFORMATION message. This message is the reference number of the code used by the MS, the number of control frames CFN, the associated frame number of the frames carrying the acknowledged SYNC1 burst signal, the corresponding interference on the P-RACH. Level, SYNC acknowledged
1 Includes timing advance and power level related to burst signal. Physical information (P
HYSICAL INFORMATION) message is waited for within 4 frames from the transmission of SYNC1.

If M + 1 SYNC1 burst signals are sent and there is no valid response from the network, the immediate allocation procedure is aborted and if this procedure is triggered by a sub-level MM request, random access Notify sub-level MM of failure. As soon as the waiting message is displayed, the mobile starts timer T3126 and sends a CHANNEL REQUEST message on the corresponding P-RACH channel with the correct values for sync and power level. Channel request (CHANNNEL
The REQUEST message contains at least the following parameters: -A call request (PAGING REQUEST) containing information about the "cause of establishment" corresponding to the "cause of establishment" given by the sub-level MM, or the need for a channel.
"Probability of establishment" corresponding to the "response to call" data cause given by the RR component in the response to the message; -a random reference parameter randomly selected from the parameters of the uniformly distributed probability for every new transmission; The time advance and the power level used by the user equipment (UE) to gain access to the network;

After transmitting the CHANNNEL REQUEST message, the mobile shall:
Start monitoring for the corresponding P / S-CCPCH and set this P / S-CCPCH on the channel with AGCH configuration.
Detect an IMMEDIATE ASSIGNMENT message waiting for.
When the count of the timer T3126 expires, the immediate allocation procedure is stopped and the sub-level MM is notified of the random access failure when the MM should initiate the access procedure.

The network may allocate a dedicated channel to the mobile and send an IMMEDIATE ASSIGNMENT message to the mobile in unacknowledged mode on the AGCH configured channel. Then, the timer T3101 is started on the network side. The IMMEDIATE ASSIGNMENT message contains: -a description of the assigned radio RU resource, channeling code, frequency and time slot, the information field of the CHANNEL REQUEST message and the frame in which the message was received. Frame number, start timing advance and power level to be used when MS next transmits on dedicated channel, access parameter and code reference number identifying access subchannel UpPTS _{SUBCH according} to the present invention
SYNC1, and optionally an indication of the start time indicated by the frame number.

When the mobile receives the IMMEDIATE ASSIGNMENT message corresponding to the channel request (CHANNNEL REQUEST) message corresponding to its own request, it stops timer T3126 and sends the next frame to the scheduled frame. At, the network sends the SYNC1 burst signal assigned on the physical channel UpPTS.

In the immediately following frame, the network responds to the SYNC1 burst signal with physical information that allows the synchronization and mobile side power levels to be additionally terminated (
PHYSICAL INFORMATION) message is sent. At the same time, the mobile switches to the channel assigned to the repeat mode and sets the channel mode for single signal transmission, which is used by the network for physical information (PHYSICAL INFOR
MATION) message also becomes valid after receiving the frame after the SYNC1 burst signal. Then, the mobile establishes the main signal transmission link on the dedicated channel DPCH by SABM (Set Asynchronous Balanced Mode) including an information field. If the mobile receives an IMMEDIATE ASSIGNMENT message containing only a description of the channel to use after the start time, the mobile waits until the start time before accessing the channel. If the start time has already passed, the mobile will access the network as an immediate reaction to the receipt of the message. In this case, it is recommended to send a SYNC1 burst signal just before the mobile switches to the assigned channel to update the mobile's synchronization status and power level as much as possible.

If there are no channels available for allocation, the network sends an IMMEDIATE ASSIGNMENT REJECT message to the mobile with a corresponding P / S-CCP.
Send in unacknowledged mode on CH channel. This message contains a reference to the request and a wait condition. The mobile unit requests its own channel (CHANNEL REQUEST
) Upon receiving an IMMEDIATE ASSIGNMENT REJECT corresponding to the message, start timer T3122 with the indication value of IE (information element "wait indication value" related to the cell in the cell that received the message), Monitor on the corresponding P / S-CCPCH channel until the timer T3126 count expires. During this time,
Ignoring the additional IMMEDIATE ASSIGNMENT REJECT message, but any immediate assignment corresponding to the mobile's CHANNNEL REQUEST message causes the mobile to perform the procedure described in the following steps.
If you have not received the IMMEDIATE ASSIGNMENT message,
The mobile returns to CCCH idle mode and monitors the mobile's ringing channel. Optionally, the mobile may request its own channel request (CHANNEL REQU
EST) message, the idle mode CCCH may be reverted to upon receipt of a response from the network. Within the same cell, the mobile is not allowed to make new attempts to establish an RR connection until the timer T3122 has expired, unless it is urgent. Immediate Assignment Rejection for Emergency RR Connection Attempts (IMMEDIATE ASSIGNME
(NT REJECT) has not been received, the mobile may attempt to enter an emergency dedicated mode in the same cell before the timer T3122 count expires. A mobile in "packet idle mode" (limited to a mobile device supporting (supporting) GPRS) can start packet access in the same cell before the count of timer T3122 expires. After the expiration of T3122, the channel request (CHANNNEL REQUEST) message is not sent in response to the call until the mobile's call request (PAGING REQUEST) is received.

When the main signal transmission link is established, the network side immediately allocates (IMME
(DIATE ASSIGNMENT) procedure. Mobile access is UPLINK A
CCESS) message (UA), the network stops timer T3101 and the sub-level MM on the network side is informed that the RR component has entered dedicated mode. _{Before describing} how to assign and use the parameters that identify the access subchannel UpPTS _SUBCH , the intra-system handover procedure deserves a brief description, merely for the purpose of highlighting the points relevant to the present invention.

Referring to FIG. 20, the network initiates an in-cell handover procedure in the system for the mobile device and sends a handover command (HANDOVER COMMAND) message to the mobile device on the main signaling link DCCH of the old cell. Is transmitted to start counting of the timer T3103. To this end, preliminary functions for handover have been achieved, including the LAPDm protocol function, which is the initialization of the data connection in the new cell for the service SPI = 0 (service access point identifier identifying the signaling). That is supported.

After receiving the HANDOVER COMMAND message, the mobile initiates the release of the previous connection, which is the connection for the various levels of the protocol, disconnecting the physical channel and in the new cell. Switch towards the assigned channel and start establishing a new connection at a lower level (this includes activating the channel, connecting the channel, and establishing the data connection). The HANDOVER COMMAND message contains (in summary) the following: -AGCH channel and new channel characteristics including FACCH and SACCH channels used for multi-resource configuration, and optionally new channel. The power level to send on. -Communicate well, including data that allows the mobile to use the prior knowledge of synchronization (eg, cell scrambling code + channel PCCPCH / DwPTS frequency and power level) that it obtains from the measurement procedure. New cell characteristics needed for: The power level of channel PCCPCH / DwPTS is used by the mobile to initially power up on the new channel. -Power command (optional). The power level specified in this power command is used by the mobile to initially power up on the new channel and does not affect the power used on the old channel. -Instruction of the procedure used to activate the new physical channel. -Handover criteria used at different protocol levels. _-A part of the parameters for accessing the dedicated channel for handover, the identifier of the group of the column SYNC1 being used in the new cell, the access parameter for identifying the access subchannel UpPTS _SUBCH in the new cell, And P-FACH
A description of the channel. -The timing advance value that should be used in the new cell (optional and used for synchronized cells). -The real-time difference that the mobile uses to calculate the timing advance to apply in the new cell (optional, used for synchronized cells). -The encryption mode that should be applied to the new channel (optional). If this information is not present, the encryption mode will be the same as the encryption mode used on the previous channel. In both cases, the encryption key is unchanged. Encryption mode command (
If the CIPHERING MODE COMMAND) message has not been sent in advance, the Handover Command (HANDOVER COMMAND) message does not include an IE in the encryption mode indicating "encryption start" and a similar handover command as shown in the example. (HANDOVER
If a COMMAND) message is received, this message is considered to be an error, and a HANDOVER FAILURE message due to "unspecified protocol error" is immediately returned, and no further action is taken.

The following mobile access (HANDOVER ACCESS) in a new cell
The steps up to the step of sending a message are performed only for asynchronous cell-to-cell handovers, but can also be performed for synchronized cells to optimize access time and power parameters. Handover command (HANDOVER
For networks with COMMAND) message signaling, one of two procedures must be enabled.

After receiving the handover command (HANDOVER COMMAND), the mobile receives the sequence SY.
Begin sending NC1 on the UpPTS channel of the indicated cell and reserve a level 1 frame for this purpose according to the criteria of the present invention. The mobile starts timer T3124 and sets the starting point of the count to the time slot of the time when the SYNC1 burst signal was first sent to UpPTS. Handover command (HANDOVER COM
MAND) message indicates more than the allowed sequence SYNC1, the mobile randomly selects from the allowed sequence SYNC1.

The network obtains the required characteristic RF from the SYNC1 burst signal and acquires the physical information (PHYSICA
L INFORMATION) message on the associated P-FACH channel in "unacknowledged" mode. The mobile sends the first burst signal SYNC1 and then the physical information (P
HYSICAL INFORMATION) Start monitoring the P-FACH channel instructed to express the message. This message is the reference number of the code used by the mobile, the frame number associated with the frame receiving the acknowledged SYNC1 burst signal (see note below), the jamming level corresponding to P-RACH, and the timing advance. including. SYNC
It waits for a PHYSICAL INFORMATION message within 4 frames from the transmission of 1. If no valid response is expressed, follow the procedure above with a timer.
Repeat until T3124 expires.

Note: The above frame number has nothing to do with the absolute frame number valid in the cell (which is still unknown to the mobile at said stage of the procedure), but on the contrary It is level 1 information that indicates to the mobile the distance between the received frame and the frame referenced by the mobile that emitted SYNC1.
This distance helps the mobile to understand whether the response of the network is to this mobile.

When the mobile receives the PHYSICAL INFORMATION message, SYNC1
The burst signal transmission is stopped and the Handover Access (HANDOVER ACCESS) message is started in a continuous frame and iteratively transmitted on the main signaling link DCCH. This message is sent in unencrypted mode on a single burst signal. The mobile is the frame number SF of the new channel in the destination cell.
Since I do not know N yet, I cannot start encryption / decryption. Immediately after receiving the PHYSICAL INFORMATION, the handover procedure is no longer important for the purposes of the invention, but for completeness, knowledge of the frame number SFN related to the dedicated channel in the new cell. It is worthy of furthering the explanation by emphasizing the technical problems caused by the lack of. The difference in level 1 of the downlink synchronization mechanism when comparing 3G systems with GSM causes problems. As described above, the downlink pilot signal DwPTS does not include the frame number SFN, and the frame number SFN is first acquired by the P-CCPCH channel. Therefore, after transmitting the Handover Access (HANDOVER ACCESS) message, the mobile starts monitoring the system information and acquires the frame number SFN unless otherwise specified. The Handover Access (HANDOVER ACCESS) message contains the following parameters: -Handover criteria received in the Handover Command (HANDOVER COMMAND) message-Time advance and power level used by the UE to gain access to the network.

When the mobile can read the information on the frame number, the mobile stops the timer T3124 to stop the transmission of the HANDOVER ACCESS message and the encoding required by the service. / Enable the physical channel being transmitted and the reception mode using the decoding method, and connect channels if necessary. When applicable, start encryption / decryption immediately.

Upon successful establishment of the connection at the lower level, the Mobile shall complete a HANDOVER COMPLETE specifying the cause of the "normal event".
Send the message back to the network on the DCCH link. The sending of this message on the mobile side and the receiving of this message on the network side allows summarization of the sending of signaling messages at a different level than the RR management level.

When the network receives the HANDOVER COMPLETE message, the network stops timer T3103 and releases the old channel with a predetermined code for the handover procedure. Especially in synchronous handover, a non-stationary case may occur in which the mobile sends a handover failure (HANDOVER FAILURE) message to the network together with designation of a cause such as "handover impossible, timing advance out of range".

This concludes the description of the main procedure with the view that the mobile device will use the column SYNC1 to access the network. The procedures described relate to cell selection (first access), cell reselection, and synchronous handover. We have exhaustively stated that access to UpPTS channels is inherently collision-free. To prevent collisions, the solution provided by the invention is to define the access class to the network by a different sub-channel UpPTS _SUBCH for transmitting the code SYNC1 in the mobile arrangement. According to a preferred embodiment of the present invention, reference numeral network, schedule a subchannel UpPTS _SUBCH N ^o defining a frame number, within this sub-channel, the mobile has selected at random from among code groups available Is allowed to be sent. For this purpose, two parameters P1 and P2 are foreseen. The mobile station that wants to access the network uses the code string SYNC1 for channel up when the system frame number SFN satisfies the following law.
Transmit on PTS: SFN module [P1] = P2 (1) SFN module [P1] ≠ P2 (2) Indication of which of these two laws should be selected and of parameters P1 and P2 The value is an information element forming part of the above access parameters included in the following related messages: BCCH, HANDOVER COMMAND, IMMEDIATE ASSIGNMENT, UPLINK FREE. Each code SYNC1 transmitted or retransmitted on channel UpPTS
Randomly selects among code values supported by the downlink carrier synchronized by the mobile, which involves the serving cell and the new cell in case of handover. For the first access to the UpPTS channel in the state of cell reselection (this is IMMEDIATE ASSIGN
MENT) before expressing a message or before entering transmission group mode), the mobile can read the schedule for channel UpPTS and the instructions for selecting law (1) or (2) from the BCCH channel. For subsequent cell reselection access, the mobile can receive the required information from the remaining handover commands (HANDOVER COMMAND), immediate assignment (IMMEDIATE ASSIGNMENT) and uplink (UPLINK) messages. .

The network (BSCC, NE) shall follow the related procedure: Immediate Assignment (IMMEDIATE ASSI
GNMENT), handover (HANDOVER), or uplink response (UPLINK REPLY)
) Is successful or unsuccessful, the subchannel UpPTS _SUBCH assignment to a specific mobile is invalidated as soon as it is completed. In particular, the network at the stage of this access procedure does not (or does not) know the mobile by the mobile's identifier IMSI.
But mobile on subchannel UpPTS _SUBCH N ^o which is scheduled for this purpose It should be pointed out to know indirectly by the code SYNC1 to send. Theoretically, there may still be collision probabilities on the subchannels. The mobile device that caused the collision is then destroyed by the network, but this probability is unquestionably lower than it would be without scheduling. Without sub-channel scheduling as done in accordance with the criteria of the present invention, there is excessive code congestion on the UpPTS channel and, as a result, there is an increased probability of collision for the channels discussed. In such a situation, failure to service is limited only by the usual anti-collision mechanisms that are foreseen in GSM, but this mechanism tries to access the entire class of service temporarily from traffic by repeatedly trying to access it. It does not have the drawbacks of eliminating it, but it has the drawback of increasing the network overload. Therefore, in 3G systems, GS
It is clear that maintaining M's anti-collision mechanism should be considered complementary under extreme load conditions.

[0102]   Tables 1 to 4 included in Appendix APP3 only consider law (1) for simplicity.
To understand how to implement the preferred embodiment of the invention in the practical case
It helps. Table 1 shows all possible sub-channels shared according to access type.
Flannel UpPTS_SUBCHShows an overview of the types of access,
By belonging to the first or second part of the assignment procedure, and this
Within the final segmented frame, access may be
It is controlled by. Tables 2, 3 and 4 show the period of law (1) or (2)
From the application of the module [P1] function to the independent variable SFN.
Guided within the system multi-frame (system multi-frame: hyperframe)
It increases monotonically with time as the unit increases. Break down subchannel specifications
While increasing the number involved, thus leading to the application of law (1) or (2)
Interval of intervals also increases. This includes negligible delays in access, but this
Delay is due to the reduced number of access attempts on a single subchannel.
Greatly compensated by the reduction of collision probability. Are these laws (1) and (2) very simple?
Has an easy-to-use expression, but independent of the periodicity of the repetition and the starting phase of the period
Can be controlled dynamically, and hierarchical multi-frame (hyperframe
) Of other expressions that can be mathematically marked with a verification mark (mark)
Depending on the application, similar results can be reached. Sub-rules (1) and (2)
Flannel UpPTS_SUBCHApplied to a group of frames with equal period and
I can make a loop. The meanings of the parameters P1 and P2 are as follows: P1 is a possible substring
Gives the total number of channels, P2 is the subchannel identifier UpPTS_SUBCHN^oCorresponding to
^.

Table 2 shows the scheduling of sub-channel UpPTS _SUBCH that returns in an equal cycle every four frames, where P1 = 4, where 50% of the sub-channels are _dedicated to handover and the other 50. Apply% to random access. In this case it follows from Table 1 that 25% of the sub-channel UpPTS _SUBCH is _dedicated to the transmission of the code SYNC1 controlled by the mobile device and 75% is controlled by the network. Table 3 shows different scheduling of sub-channel UpPTS _SUBCH ,
Here, while maintaining the previous value P1 = 4, 25% of the subchannels are for handover and 75% are for other random access procedures. In this second case, Table 2
Despite the different scheduling for, the sharing of subchannels between the mobile device and the network has the same result in terms of commanding the transmission of code SYNC1. Table 4 shows a scheduling that increases the number of sub-channels UpPTS _SUBCH in number compared to the previous two tables, so that the value of P1 is a call that exits the mobile (moc) or terminates towards the mobile. Choose equal to 8 to distinguish access in (mtc). In groups of eight subchannels repeating allocation percentage of UpPTS _{S UBCH} subchannels between the handover and other random access procedure is 50% of the equivalent. In this third case,
12.5% of sub-channels will be used for access control by mobile devices and the remaining 87.5
% Is used for network processing. Subchannel Table 4 have the following identifier UpPTS _{S UBCH} N ^o: handover 0/2/4/6; RA1 # (moc) 1 ; RA1 # (mtc) 5; RA2 #
(moc + m.tc) 3,7.

The table above makes it possible to select different combinations of the parameters P1 and P2 to control the random access that the mobile device performs on the channel UpPTS with the different procedures envisaged at the Um radio interface. It indicates that there is. The operator who configures the system can benefit from the present invention for the correct planning of resources for the expected traffic. The preferred characteristics of the subchannels obtained as described above do not necessarily require knowledge of the absolute system frame number SFN in the hyperframe. In fact, it is sufficient to know the irreducible frame number SFN ′, which starts the numbering at a position corresponding to the start frame of periodic signal transmission in multiple frames and repeats in the same period. The period of this signal transmission interleaving corresponds to the need for the channel P-CCPCH. Table 9
In addition, a multi-frame consisting of 48 control frames is divided into 12 blocks of 4 frames each, and each block is BCCH or PC for transmission of system information and call information.
An example of assigning to the H channel is shown. In this case, the start frame of the signal transmission block has an interleave period of 4 frames. As already mentioned, the need for the starting frame of a block is signaled in a known manner using the information intentionally added in the burst signal of the downlink pilot signal DwPTS. Next, considering the first frame of the interleaving period of the signaling of the system, this matches the first frame of the repeating period for the calculation of shared access subchannels, without knowledge of the absolute frame number SFN, The necessary and sufficient condition that the number SFN can be replaced with the irreducible number SFN ′ according to the expression (1) or (2) is that the values of the two access parameters P1 and P2 are within the interleave period of the signal transmission or within this period. That is, it is a value that identifies the sub-channel in the matching multiple frames. In the case of the formula described above, this condition is given by P1 ≤ (interleave period of signal transmission). Complying with these conditions allows the mobile to follow the transient evolution of the need for messages carried by channels that employ control multiframe division into blocks. The last thing I mentioned about irreducible absolute frame number SFN 'is that it has less general value than using absolute frame number SFN, which is associated with different system and signaling functions, such as asynchronous. In some cases, such as
The usefulness of the irreducible number SFN 'is clear. In this case, the mobile actually has to be synchronized with the timing of the frame occurring in the new cell, for this purpose,
The mobile starts transmitting SYNC1 on the foreseeable sub-channel for handover. Since the mobile has no knowledge of the absolute frame number SFN, it cannot compute these subchannels first. Waiting for the decoding of such information can be seen as taking too long, and therefore the mobile may alternatively ask the downlink pilot signal DwPTS to inquire about the start of the interleaving period of the signaling. Can be obtained much faster, which is equivalent to getting the irreducible frame number SFN ', and using the irreducible frame number SFN', the formula (1
) Or (2), the subchannel of the handover waiting to read the absolute frame number SFN is calculated.

[0105]   Now, a first different embodiment of the procedure of the present invention will be described and this description will be followed.
For reference, Table 5 in Appendix APP3 can be referred to. Applying another embodiment,
Here, the sub-channel is the key that is being used in the cell, not by the calculation of a formula.
Generated by proper sharing of the code sequence SYNC1 which is globally associated with the carrier. To share
Therefore, SYNC1 during mobile processing is divided into a predetermined number of separated subsets.
This subset can be a single element, with each subset associated with an access type.
To do. Table 5 shows the possible splits, where 8 available SYNC1s, 50% are
And the remaining 50% is allocated to other access types shown in the first column.
ing. Table 5 shows the same identifiers already used in Table 4 to indicate the same access types.
UpPTS_SUBCHN^oDenote by the eight sub-channels. Each identifier UpPTS in Table 5 _SUBCH N^oIndicates a subchannel consisting of a subset of related codes. Subchan
The specific configuration of the channel, i.e. the identifier of the code contained in the subset, is the information element SYNC1-RIP.
Indicated by. Eight marks when processing the carrier in forming the subsystem
Identifier SYNC1 that identifies a column in a number group_NIdentify that you have not yet assigned
Freely choose among the children, this freedom chooses the code sequence, aside from others
Because there is no specific reason to do it. Because of this, and the selected subcha
Channel UpPTS_SUBCHMore than one code is foreseen in a subset of codes associated with
Whenever a mobile device using this sub-channel is assigned a code belonging to this sub-set,
The code is randomly selected from among. In the case of the first embodiment, the access described above
The information corresponding to the parameter is the information element SYNC1-RIP and UpPTS._SUBCHN^oIncluding
Information is transmitted over the same channel, and refer to the preferred embodiment of the present invention.
Use the same message that was already highlighted. In the case of the first different embodiment,
, Subchannels are no longer periodic and mark subchannels in multiple frames
, And the new nature of the coordination mechanism creates temporal access restrictions.
No, but rather creates access restrictions in the space of the codestream.

The introduction of these other embodiments is not as effective as the computation of expressions (1) or (2), since it does not reduce the collision probability on the UpPTS channel on average. These other embodiments actually reduce the amount of code SYNC1 during processing of a mobile device during a single access, which itself increases the probability of collision on the channel, but at the same time increases the number of access channels. And reduce the number of codes required for each single access by the same rate. This generally means that the collision probability remains largely unchanged whether or not according to the first alternative embodiment. However, in the short term, and especially in mobile radio environments, advantages can be found in the presence of traffic congestion, such as in microcells of cities. In this case, by carefully selecting a subset of codes, it is possible to avoid annoying slowdown in service due to excessive handover requests. The first alternative embodiment, in addition to the immediate attainable advantage, teaches alternative methods for the formation of subchannels, as such, the applicant is entitled to patent protection. Is the opinion. The utility of the other embodiments can be found immediately from now, without having to wait for future development, which is the step immediately following the transmission of SYNC1, i.e. with the network before allocating the dedicated channel. Related to the handshake stage. Prior to this, we have already found that the handshake is accelerated whenever the following types of links are created: SYNC1 → P-FACH → P-RACH → P / S-CCPCH This is available Start immediately after distinguishing between different SYNC1s. When the mobile device selects SYNC1, it also selects the channel associated with SYNC1, so SY
Having already shared NC1 helps to form these links

A second alternative embodiment of the procedure of the invention will now be described, which comprises the expression (1)
Or (2) is used as an initial approach to generate subchannels, but in selecting the code to be transmitted, the mobile also applies the criteria of the first different embodiment. This makes the SYNC1 to be transmitted, the parameter P1 and P2, equal to the subchannel particularly indicated P2, from among the subset of SYNC1 described by SYNC1-RIP corresponding to the sub-channel indicated by the identifier UpPTS _SUBCH N ^o Implicit in choosing. In equivalent terms, it means that, in the two cases, the access types associated with the subchannels are identical and can therefore prove to be a synergistic action of the two subchannel-specific criteria. In the case of the second embodiment, the information corresponding to the above-mentioned access parameters includes parameters P1 and P2, and information elements SYNC1-RIP and U.
This information, including pPTS _SUBCH No, is transmitted over the same channel and uses the same message as already described with reference to the preferred embodiment of the present invention. 21 and 22 are two equivalent diagrams summarizing, from a functional point of view, the shared access subchannel identification criteria within the scope of the preferred embodiment of the present invention and two other embodiments.

Referring to FIG. 21, the criteria proceed from the left of the figure to the right in the general order of decreasing. In the first block, some access parameters are notified to the resource to get the sub-channel associated with the access type. The second block is a pre-process for the two other embodiments described here, which requires the sharing of SYNC1, which must be introduced as restricted to allocation groups.
The third block signals the different options opt1, opt2, and opt3 available to identify the subchannels. The circular block following this represents an alternative way of presenting to the mobile only after the sub-channel has been identified, in particular the way the mobile sends SYNC1 on the previously identified channel, ie R = Random mode or C = mode according to a command previously received from the network. One of the other methods yields results equivalent to the last option.
Of course, because of the possibility of repetition and inconsistency, the options shown in the last block are not always acceptable. For example, option 2-
The option shown as 2 is inconsistent, because it doesn't seem logical that the network first instructed code sharing and then gave a new command that sent a particular code. Of course, it makes more sense to directly order the code to be transmitted. Conversely, option 3-
The option represented by 2 is a repetition of the option represented by option (OPTION) 1-2. The inconsistency and repetition once emphasized can be easily avoided at the stage of assigning access parameters for subchannel identification.

Referring to FIG. 22, a circular block for selecting a transmission method of the code SYNC1, that is, a random block or a network command is a block showing different options for specifying a sub-channel. You can see that you are ahead. This allows to eliminate sources of inconsistency and repetition from the beginning.

APPENDIX APP1 Appendix APP1 contains Table A, which contains a very general functional description of the Level 2 protocol used for the GSM and 3G mobile systems of FIG. 2, and a similar Table B relating to the Level 3 protocol. Show. Legend of FIG. 6 PHL Physical layer MAC Media access control LAPD Link access protocol on channel LAPDm Modified link access protocol on D channel MTP Message transfer part RPM Radio resource management SCCP Signal transmission connection control protocol MM Mobility management CM Connection management DTAP Direct transfer application section BSS_MAP Base station system_Mobile application section

[0111]

[Table 1]

[0112]

[Table 2] APPENDIX APP2 APPENDIX APP2 describes the radio interface of the 3G mobile system to which the present invention is applied.
Tables 1-9 detail some physical and functional properties of Uu.

[0113]

[Table 3]

[0114]

[Table 4]

[0115]

[Table 5]

[0116]

[Table 6]

[0117]

[Table 7]

[0118]

[Table 8]

[0119]

[Table 9]

[0120]

[Table 10]

[0121]

[Table 11] APPENDIX APP3 Appendix APP3 shows Tables 1-5 representing application examples of the procedure according to the invention. More specifically, Tables 1 to 4 belong to the preferred embodiment of the present invention, and Table 5 belongs to the first different embodiment.

[0122]

[Table 12]

[0123]

[Table 13]

[0124]

[Table 14]

[0125]

[Table 15]

[0126]

[Table 16]

[Brief description of drawings]

FIG. 1 is a block diagram of a GSM or DCS type mobile system.

FIG. 2 is a block diagram of a scenario including a GSM system and a 3G system according to the present invention.

FIG. 3 is a diagram showing a hierarchy of consecutive frames of a signal transmitted to a wireless interface Um of the mobile system GSM of FIGS. 1 and 2.

4 is a diagram illustrating a logical channel structure supported by a hierarchy of consecutive frames in FIG.

5 shows two possible configurations of the logical channel of FIG. 4 within the hierarchy of consecutive frames of FIG.

6 is a block diagram of a protocol with more hierarchical levels that controls the operation of the two mobile radio systems of FIG.

7 is a message sequence diagram related to the outgoing call protocol limited to the exchange of messages to the interface radio Um of the mobile system GSM of FIG. 1;

8 is a diagram of the message sequence associated with the closed call protocol limited to the exchange of messages to the interface radio Um of the mobile system GSM of FIG. 1;

9 shows a diagram of a message sequence related to the inter-cell handover protocol limited to message exchanges in the radio interface Um of the mobile system GSM of FIG.

FIG. 10 is a message sequence diagram for the handshake phase for the handover failure case of FIG. 9;

FIG. 11 is a diagram showing a hierarchy of consecutive frames of a signal transmitted to a wireless interface Uu of a mobile system including the present invention.

12a shows a number of possible basic frames belonging to the hierarchy of FIG.

FIG. 12b shows some possible basic frames belonging to the hierarchy of FIG.

FIG. 12c shows some possible basic frames belonging to the hierarchy of FIG.

12d is a diagram showing a structure of a DwPTS burst signal included in the basic frame of FIG. 12a. FIG.

12e is a diagram showing the structure of an UpPTS burst signal included in the basic frame of FIG. 12a.

12f shows a general structure of burst signals Ts0, ..., Ts6 included in the basic frame of FIG. 12a.

12g is a diagram showing an actual structure of burst signals Ts0, ..., Ts6 included in the basic frame of FIG. 12a.

13a and 13b, together with scrambling code groups and groups of midambles that may be associated with the burst signals of FIGS.
FIG. 3 is a diagram of a standard used in a 3G system in which a PTS is shared between different cells.

14 shows a table that completes the criteria of FIG. 13 by sharing the available UpPTS burst signals of FIG. 12e.

15 illustrates a logical channel structure supported by the continuous frame hierarchy of FIG.

16 shows a partial representation of the successive frames of FIGS. 3 and 11 and their comparison.

FIG. 17 is a diagram representing the physical and logical channels associated with the basic frame of FIG. 12a.

FIG. 18 is a diagram of a message sequence related to an outgoing call protocol limited to message exchange in the interface radio Uu of the 3G mobile system to which the present invention is applied.

FIG. 19 is a diagram of a message sequence related to a termination call protocol limited to message exchange in the interface radio Uu of the 3G mobile system to which the present invention is applied.

FIG. 20 is a diagram of a message sequence related to a partial protocol of handover between cells in a system in a radio interface Uu of a 3G mobile system to which the present invention is applied.

FIG. 21 is a diagram showing functional criteria that recalls an overview of the process of the invention and other embodiments of the invention.

FIG. 22 is a diagram showing functional criteria that recalls an overview of the process of the invention and other embodiments of the invention.

─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5K022 EE02 EE14 EE21 EE31                 5K028 BB06 CC02 CC05 EE08 HH00                       KK01 KK12 MM05 MM08                 5K067 AA21 BB04 BB21 CC10 DD11                       DD51 EE02 EE10 HH22 JJ16                       JJ71 JJ76 [Continued summary] The following messages to be transmitted or over time: Call Request, immediate assignment, handover command, update There are two parameters included in the free link.

Claims (27)

[Claims] 1. A method of scheduling an access channel in a wireless communication system comprising a plurality of mobile devices, wherein the mobile device shares a wireless channel for accessing a network within the wireless communication system. And a base station (BTSC) for cellular telecommunications (3G) in which the wireless communication system is in communication with the mobile device (UE) through at least one receive-transmit carrier carrying transmit and receive signals. ), Which is contained in adjacent time slots belonging to consecutive frames and which is repeated indefinitely in a hierarchical multiframe (hyperframe) and generates in the baseband a bit sequence called a burst signal. , Each bit string has an associated code for code division multiplexing on a common carrier The transmission and reception signals include at least a pilot signal (DwPTS) transmitted to the mobile device by the base station in the frame to synchronize reception of the mobile device, and the base station moves the mobile device. The position of the service channel (BCCH) containing system information for the device in the multi-frame is indicated, and the transmission and reception signals are identification information transmitted by the mobile device to the base station on the shared access channel. In the scheduling of access channels in a wireless communication system comprising a sequence (SYNC1), said wireless communication system comprises: a) a network inserted in the system information carried by said service channel (BCCH), or at least a network Dedicated to the mobile device requesting access to Said mobile device reading the appropriate access parameters (P1, P2, P3) inserted in the message sent by the network at the beginning of the procedure for assigning channels (TCH, SACCH, FACCH); b) said mobile device , A shared access subchannel (UpPTS _SUBCH ) of the shared access channel (UpPTS) is generated, and the access parameters (P1, P2, P3) are generated.
) _Is used to associate each of the subchannels with an access type; and c) one of the identification information sequences (SYNC1), or a code sequence, of the shared access subchannel (UpPTS _SUBCH ). Scheduling an access channel, the method comprising: transmitting on one of the. Wherein said code sequence (SYNC1) is the reception by the network - belonging to the code sequence group associated with the transmission carrier (GROUP UpPTSN ^o), in the first message that the service channel (BCCH) is PR The access channel scheduling according to claim 1, wherein the association method is signaled to the mobile device by inserting identification information of the group. 3. The scheduling of the access channel according to claim 2, wherein in the step c), the mobile device transmits a code sequence randomly selected from available code sequences. 4. In the step c), the mobile device transmits a code string, and the identification information of the code string corresponds to one of the access parameters (P3) read in the step a). The scheduling of the access channel according to claim 2, wherein: 5. In said step b), said mobile device is a mathematical expression giving at least the first two of said access parameters (P1, P2) a sequence of frames marked in a multiframe. It is used in the calculation to obtain the access sub-channel (UpPTS _SUBCH ) and the multi-frame has the first two parameters (P1).
, P2) with a repetition period controlled by the value of P2) and a marked phase, wherein one of the subchannels consists of a group of frames which are marked with equal period and phase. Scheduling of the access channel according to claim 3 or 4. 6. The at least first two access parameters are two parameters P1 and P2 introduced in the following mathematical expression: SFN module [P1] = P2, and the mobile device has these two parameters. The scheduling of an access channel according to claim 5, characterized in that a frame numbered with a system frame number SFN as belonging to one of the sub-channels (UpPTS _SUBCH ) is _marked by introducing. 7. The at least first two access parameters are two parameters P1 and P2 introduced in the following mathematical expression: SFN module [P1] ≠ P2, wherein the mobile device has these two parameters. The scheduling of an access channel according to claim 5, characterized in that a frame numbered with a system frame number SFN as belonging to one of the sub-channels (UpPTS _SUBCH ) is _marked by introducing. 8. The at least first two access parameters are the two parameters P1 and P2 introduced in the mathematical expression: SFN module [P1] = P2 SFN module [P1] ≠ P2 The device introduces these two parameters to mark the frames numbered with the system frame number SFN as belonging to one of the sub-channels (UpPTS _SUBCH ) and the access parameters are Scheduling of the access channel according to claim 5, characterized in that it also comprises an indication of which of the two mathematical expressions should be used. 9. The iterations characterized in that the values of the first two access parameters (P1, P2) identify a sub-channel located within a second iteration period within a multi-frame and characterize the sub-channel. The period (P1) or more, the second repetition period or interleave period corresponds to the length of a continuous block of frames allocated to the service channel carrying the system information, and the start frame of the second interleave period is , A signal is transmitted by a known technique using information intentionally added to the burst signal of the pilot signal (DwPTS) transmitted by the base station in the downlink, so that only the knowledge of the irreducible frame number SFN 'is obtained. On the basis of, it is possible to establish the shared access channel, the numbering of the irreducible frame number SFN ', Starts from the place that matches the starting point of the serial the second iteration cycle,
It repeats at the same interval as the said 2nd repetition period, and replaces the said absolute frame number SFN in the said mathematical expression which gives the said shared access subchannel, It is characterized by the above-mentioned. Scheduling of the listed access channels. 10. A mobile device, in step a), the second access parameters (SYNC1-RIP, reads the UpPTS _{SUBC H} N ^o), wherein in step b), using the second access parameters, by the network the code sequence of the assigned said group (gROUP UpPTSN ^o) (SY
The NC1), the code sequence independent number (shared between the sub-set of N ^o), the subset can be one single element, each subset (UpPTS _SUBCH N ^o) Is associated with the shared access subchannel (UpPTS _SUBCH ), the scheduling of the access channel according to claim 3. 11. The mobile device calculates in step b) the mathematical expression according to the first two access parameters (P1, P2) to mark the numbered frames forming subchannels. the second access parameters _{(SYNC1-RIP, UpPTS SUBCH N} o) is the share the code sequence (SYNC1) showing, to obtain the subset of the code sequence associated with the sub-channel (UpPTS _SUBCH N ^o), the second access parameters _{(SYNC1-RIP, UpPTS SUBCH N} o) is, the first two parameters (P1, P2) shared access sub-channel associated with the same access type as specified with the (UpPTS _SUBCH) Scheduling of an access channel according to any of claims 5 to 10 dependent on claim 3, characterized in that it is specific. 12. Scheduling of said access channel follows said step c), and d) said mobile device responds with a message (PHYSICAL INFORMA) coming from the network.
TION: physical information) waiting, the response message correlating at least the following information elements: the transmitted code (SYNC1), said access parameters (P1, P2, P3, SYNC1-RIP, UpPTS _SUBCH N ^o ), and a command (CHANNNEL REQUEST: channel request) for synchronizing the timing and power level of the signal transmitted by the mobile device during the step immediately following and included in the ongoing procedure.
HANDOVER ACCESS); e) one of the response messages before scheduling of the access channel further aborts the procedure of allocating one of the dedicated channels (TCH, SACCH, FACCH). 3. The method further comprises the step of repeating the step c) of transmitting the code string (SYNC1) and the step d) of waiting until the reception of one (PHYSICAL INFORMATION) is tried within a predetermined number of times. 11. Scheduling of the access channel according to any one of 11. 13. The step of transmitting, by the mobile device, a code sequence (SYNC1) on the access subchannel (UpPTS _SUBCH ) before allocating one of the dedicated channels (TCH, SACCH, FACCH). Repeating step c), the access subchannel (UpPTS _SUBCH ) is included in the response message (PHYSICAL INFORMATION) received in step e).
, P2, P3, SYNC1-RIP , the scheduling of the access channel according to claim 12, characterized in that identified by UpPTS _SUBCH N ^o). 14. The access parameters (P1, P2, P3, SYNC1 -RIP, UpPTS SUBC H N o) is a dedicated channel (TCH, SACCH, FACCH) in the same procedure in assigning a,
The scheduling of access channels according to claim 13, wherein different access subchannels (UpPTS _SUBCH ) are generated. 15. The shared access sub-channel is released when the allocation of the dedicated channel (TCH, SACCH, FACCH) to the mobile device is completed. Access channel scheduling. 16. A mobile system for performing scheduling of an access channel according to claim 1, wherein the system is arranged in a base transceiver station (BTSC) and a mobile device (UE) to transmit and receive signals. A means for generating a bit sequence in the baseband corresponding to, said bit sequence representing adjacent time slots of consecutive frames repeated indefinitely within the hierarchical multiframe associated with the receive-transmit radio frequency carrier. The mobile system further comprises a set of codes for code division multiplexing on a shared carrier associated with the bit string; a pilot signal (DwPTS) located in the transceiver base station and advertised in the frame. A system for causing the pilot signal to synchronize the reception of the mobile and to be advertised to the mobile device. And a position of a service channel (BCCH) including information in the hierarchical multi-frame (hyperframe); the mobile system is further arranged in the mobile device (UE), and the pilot signal ( DwPTS) for executing the instructed operation; interface radio (Uu) for exchanging messages which are included in both the base station (BTSC) and the mobile device (UE) and have different information content. Means particularly suitable for carrying out the protocol envisaged in (1); an access channel (UpPTS) to a network which is arranged in said mobile device (UE) and which is shared by said mobile device and is prone to collisions. A mobile system comprising a means for generating an identification information sequence (SYNC1) to be transmitted to the base station (BTSC), the mobile system comprising: Means at the beginning of the procedure for allocating a dedicated channel (TCH, SACCH, FACCH) to at least a mobile device requesting access to the network, which comes from said service channel (BCCH) or the network It also comprises means for reading the information content of the message coming from the message to be sent, said information content having appropriate access parameters (P1, P2, P3, SYNC1-RIP, U
pPTS _SUBCH N ^o) includes; said mobile system further disposed within said mobile device, said generated shared access sub-channel of the shared access channel (UpPTS) (UpPTS _SUBCH), each of said sub-channel access type Means for associating; The mobile system, further comprising means arranged in the mobile device and transmitting an identification information sequence (SYNC1) also called a code sequence on the shared access sub-channel (UpPTS _SUBCH ). 17. The code sequence (SYNC1) belongs to a code sequence group (GROUPO UpPTS N) associated with the receiving-transmitting carrier by a network, and the group is included in a start message advertised by the service channel (BCCH). 17. The mobile system of claim 16, wherein the associated mode is signaled to the mobile device by inserting an identifier of 18. The method as claimed in claim 17, wherein the means arranged in the mobile device for transmitting a code sequence (SYNC1) randomly selects a code sequence from the available code sequences. Moving system. 19. The means for transmitting a code sequence (SYNC1) arranged in the mobile device transmits the code sequence, and the identification information of the code sequence is arranged in the mobile device and comes from a network. 18. Mobile system according to claim 17, characterized in that it corresponds to one of the access parameters (P3) stored by the means for reading and storing the information content of the message. 20. A shared access subchannel (Up) located in the mobile device.
PTS _SUBCH ) using at least the first two of the access parameters (P1, P2) to calculate a mathematical expression giving a sequence of marked frames in a _multiframe , _{Obtaining the} shared access subchannel (UpPTS _SUBCH ), the _multiframe having a repetition period and a marking phase controlled by the values of the first two parameters (P1, P2), One of
20. A mobile system according to claim 18 or 19, characterized in that one comprises a set of frames marked with equal periods and phases. 21. The means arranged in the mobile device for generating a shared access subchannel introduces the first two parameters P1 and P2 into the formula: SFN module [P1] = P2, _21. Mobile system according to claim 20, characterized in that the frames numbered with the system frame number SFN as belonging to one of the sub-channels (UpPTS _SUBCH ) are marked. 22. The means arranged in the mobile device for generating a shared access sub-channel introduces the first two parameters P1 and P2 into the following equation: SFN module [P1] ≠ P2 _21. Mobile system according to claim 20, characterized in that the frames numbered with the system frame number SFN as belonging to one of the sub-channels (UpPTS _SUBCH ) are marked. 23. The means arranged in the mobile device for generating a shared access sub-channel calculates the first two parameters P1 and P2 as follows: SFN module [P1] = P2 SFN module [P1] ≠ Introduced in P2, mark the frames numbered with the system frame number SFN as belonging to one of the sub-channels (UpPTS _SUBCH ), and _{add the} access parameters , UpPTS _SUBCH N ^o) is, mobile system according to claim 20, characterized in that it comprises also indication of whether must use one of the two mathematical expression. 24. The values of the first two access parameters (P1, P2) identify subchannels arranged within a second repetition period within a multiframe,
And is greater than or equal to the repetition period (P1) characterizing the sub-channel, and the second
The pilot for which the repetition period or the interleave period corresponds to the length of a continuous block of frames allocated to the service channel carrying the system information, and the base station downlink-transmits the start frame of the second interleave period. Signaling by a known technique that uses information intentionally added in the burst signal of the signal (DwPTS), thereby forming the shared access channel based only on knowledge of the irreducible frame number SFN '. Starting from where the numbering of the irreducible frame number SFN ′ coincides with the starting point of the second iteration period,
24. It repeats at the same regular intervals as the said 2nd repetition period, and replaces the said absolute frame number SFN in the said mathematical expression which gives the said shared access subchannel. The moving system according to any one of 1. 25. wherein said means for generating a shared access sub-channel is located within the mobile device, the second access parameters (P3, SYNC1-RIP, UpPTS SUBCH N o)
To share the code sequence (SYNC1) of the group (GROUP UpPTSN ^o ) assigned by the network among a number of independent (N ^o ) subsets of the code sequence, the sub-set being Mobile system according to claim 18, characterized in that it can be one single element, each said sub-set being associated with said sub-channel (UpPTS _SUBCH ). 26. The numbering means arranged in the mobile device to generate a shared access sub-channel, calculating the mathematical expression using the first two access parameters to form a sub-channel. identify the frame, the second access parameters _{(SYNC1-RIP, UpPTS SUBCH N} o) with, between the subsets of the code sequence a (SYNC1), a number separated in the code sequence (N ^o) Shared with
The second access parameters _{(SYNC1-RIP, UpPTS SUBCH N} o) is, the first two parameters (P1, P2) shared access sub-channel associated with the same access type as specified with the (UpPTS _SUBCH) Characterized by being specific,
The mobile system according to any one of claims 20 to 25, which is dependent on claim 18. 27. The shared access subchannel is released when the allocation of the dedicated channel (TCH, SACCH, FACCH) to the mobile device is completed. Moving system.