Method of hash coding by multiple frequency ranges in communication system and device for its realisation

FIELD: information technologies.

SUBSTANCE: method uses double-level hash coding to assign a mobile station first to frequency range, and then to specific frequency in this frequency range. Versions of invention make it possible to assign weights to frequencies, and mobile stations may do has coding using weighted frequencies.

EFFECT: weighing makes it possible to do uneven distribution of mobile stations by frequencies for optimisation of working parametres of the system.

24 cl, 13 dwg

 

The technical field to which the invention relates.

The present invention relates in General to communications and, in particular, relates to a new and improved method and apparatus for hashing on multiple frequency bands in a communication system.

The level of technology

Communication systems and, in particular, wireless systems, designed for effective allocation of resources among many different users. In particular, developers of wireless systems aim to provide sufficient resources to meet the needs of customers in communications, while minimizing costs. Efficient use of resources requires immediate assignment to mobile stations of a particular frequency.

In the wireless communication system that uses multiple access code division multiple access (CDMA) or wideband multiple access code division multiplexing (WCDMA), each of the subscriber units assigned code channels at selected time intervals based on time-multiplexing. The Central communication node such as a base station (BS) or node, implements a unique carrier frequency or channel code associated with the subscriber, to be able to carry with him an exclusive relationship. In terrestrial systems, where used physical relay is intacta switching or packet switching, can also be implemented schemes multiple access with time division channels. A CDMA system may be designed to support one or more standards, such as: (1) the "TIA/EIA/IS-95-B compatibility "mobile station - base station for dual-mode wideband cellular systems with spread spectrum, called here the standard IS-95; (2) the standard offered by a consortium partnership Project 3rd generation", here called 3GPP; and standard, embodied in a set of documents, including documents No. 3G TS 25.211, 3G TS 25.212, 3G TS 25.213, and 3G TS 25.214, 3G TS 25.302, here called the W-CDMA; (3) the standard offered by a consortium partnership Project 2 3rd generation, here called 3GPP2, and the standard TR-45.5, called here, cdma2000, formerly known as IS-2000 MC; or (4) any other wireless standard.

The CDMA2000 is an upgraded version of TIA/EIA-95. It provides a significant increase in throughput for voice and advanced data capabilities and is compatible with mobile stations operating on the previous TIA/EIA-95. When a mobile station moves between base stations in the CDMA2000 system, it must register and receive its allocated frequency for communication. The assignment of frequencies is carried out in EMA the registration process. The registration includes the hashing process for assigning frequencies to mobile stations. Mobile subscriber must re-register when moving from one base station to another, each such transition initiates a new hash with the allocation of new frequency, and in many cases a new frequency range. Hashing is triggered when any change in the allocation of frequencies or frequency change of scales. The distribution and weighting of the frequencies is an important aspect for the leveling system and ensure its effective functioning. The mobile station also updates the utility system information each time you perform the hashing. This can lead to additional and excessive changes of frequencies, each frequency change requiring re detection system and read a service system information. Unfortunately, upon detecting system paging messages directed to the mobile station, may be lost.

Accordingly, there is a need for method and device for hashing mobile subscribers across multiple ranges without unnecessary frequency changes.

The invention

Disclosed here, embodiments of the invention is aimed at meeting formulated the above needs by providing a means for hashing the mobile stations in multiple frequency ranges. One option provides a way of containing the stage at which hairout mobile station in a frequency band; and then where hairout mobile station at a particular frequency in this frequency range. In another embodiment, the method comprises a stage on which hairout mobile station in a frequency band using mehdipatnam hashing, and MediaPhone hash-based message.

In one embodiment, the provided method mehdipatnam hashing. According to this method, first hairout mobile station in a frequency band using mehdipatnam hashing. MediaPhone hash-based message from the base station.

The next option provides a method for hashing a mobile station to a specific frequency by sending messages from the first device to the second device, receiving this information in the first device and the subsequent hashing the first device in the frequency range on the basis of the information mentioned in the message.

Additional option provides hash-based weighting. Hashing-based weighting can result in uneven distribution of mobile stations supported frequencies. Each frequency in the frequency range assigned weight. Then the mobile station hairout frequency,and the frequency with large weights assigned a greater number of mobile stations, than the frequency with smaller weights.

Hashing-based weighting can also be used with multiple frequency ranges. In this case, the weight may be assigned to each frequency in each frequency range. The mobile station receive a message containing a list of frequency bands with weights assigned frequencies in these frequency ranges. Mobile station hairout in the frequency range and at a particular frequency in this range based on the assigned weights.

Another option provides computer commands for hashing a mobile station in a frequency band, and subsequent hashing a mobile station to a specific frequency in this frequency range.

The next option provides computer commands for sending messages from the first device to the second device, receiving information in this message in the first device and the hash of the first device in the frequency range based on the information in the specified message.

Another option provides computer commands to assign weights each frequency in the frequency range of hashing a mobile station to a frequency based on the weight assigned to computer commands for this frequency, and distribution of mobile stations over a range of frequencies based on the weights assigned to these frequencies. This may is the input to the uneven distribution of mobile stations by frequency.

Another option provides a computer program for assigning weights each frequency in multiple frequency bands, sending the message to the mobile station containing a list of frequency bands and a list of frequencies in these frequency ranges. Each frequency in the frequency range has an assigned weight. The mobile station scans the list of frequency bands and frequencies and eliminates those frequencies whose support is not provided. Mobile station sorts the frequency bands and frequency to ensure stable process of hashing base stations. Then the mobile station hairout in the frequency range, and then hairout frequency within this frequency range on the basis of computer commands.

One option provides a network containing a means for hashing a mobile station in a frequency range; means for determining assignments of frequency ranges for each mobile station; means for hashing a mobile station to a specific frequency in the frequency range and means for repeating the process of hashing for each mobile station in the network.

Another option provides a device that includes means for hashing a mobile station in a frequency band, and means for hashing a mobile station to a specific cha is Tautou in this frequency range.

Another option provides a device that includes means for hashing a mobile station in a frequency band using mehdipatnam hashing. In this embodiment, MediaPhone hashing is performed on the basis of the message.

Additional option provides a device for hashing multiple ranges using the assigned frequencies of scales. The device includes means for assigning a weight to each frequency in each frequency range, means for assigning weight range based on the weights of the frequencies in this range, the means for sending the message to the mobile station containing a list of frequency bands, and the list of frequencies in these frequency ranges. Each frequency is assigned a single weight and this information is sent to the mobile station in the message. Also provided additional means for the mobile station, is used to view frequency bands and frequencies in these ranges. The mobile station includes a tool to exclude frequencies that it does not support. The mobile station includes means for sorting ranges and frequencies to ensure a stable process of hashing base stations. The device also includes means for hashing a mobile station in a frequency di is the range and means for hashing a mobile station to a frequency in this frequency range based on the assigned weights.

Brief description of drawings

The features, objectives and advantages of the disclosed here are methods and devices will become more apparent from the subsequent detailed description, taken together with the accompanying drawings, in which identical reference position identify the same elements in all the drawings and where:

Figure 1 - wireless communication system according to a variant of the invention;

figure 2 - overview state diagram when scheduling calls.

figure 3 - wireless communication system that supports hashing on many ranges without unnecessary frequency changes;

figure 4 - field and the length field in the message channel synchronization;

figure 5 - way hash used in the forward paging channel (FPCH);

6 is a detail of the structure of the message.

Fig.7 - fields and length fields to the query command;

Fig - fields and values field length for non-Autonomous registration on the basis of changes of parameters;

Fig.9 - fields and values field length for a message about the initiation of a call;

figure 10 - fields and values field length for communication with system parameters;

11 - hashing based on the weighting logic 1/2 duplex hash;

Fig - block hashing scheme based on the weights with the logic 2/2 duplex hash;

Fig - sorting is astot in the frequency range before hashing.

Detailed description of the invention

It is desirable that modern communication system supported a wide variety of applications. One such communication system is a system with multiple access and code division multiple access (DMA), which corresponds to the "TIA/EIA-95 compatibility "mobile station - base station for dual-mode cellular systems with wideband spread spectrum" and its subsequent version, called here the standard IS-95. The CDMA system allows you to transmit voice and data between users of land-line communications. An updated version of the CDMA system is called CDMA2000. The use of technology in CDMA communication system with multiple access are disclosed in U.S. patent No. 4901307 "SPREAD SPECTRUM MULTIPLE ACCESS COMMUNICATION SYSTEM USING SATELLITE OR TERRESTRIAL REPEATERS," and U.S. patent No. 5103459 "SYSTEM AND METHOD FOR GENERATING WAVEFORMS IN A CDMA CELLULAR TELEPHONE SYSTEM", the rights to which are owned by the assignee of the present invention and the contents of which are incorporated here by reference.

Aspects of the invention are disclosed in the following description and associated drawings, specific variants of the invention. Can be offered alternative embodiment of the invention, not beyond his capacity. In addition, well-known elements of the invention are not described in detail or description is omitted, with those who, in order not to obscure important details of the invention.

The word "exemplary" is used herein to mean "serving as an example, option, or illustration". Any described here is a variant of the invention as "exemplary" is not necessarily be construed as preferred or have advantages over other options. Similarly, the term "embodiments of the invention" does not necessarily imply that all embodiments of the invention include the discussed feature, advantage or mode of operation.

In the MC-CDMA or CDMA2000 messages between users pass through one or more base stations. In wireless communication systems a direct line of communication refers to the channel through which signals are passed from the base station to the subscriber station, and the reverse link refers to the channel through which signals are passed from the subscriber station to the base station. Passing data through a return line connection to the base station, the first user at the first subscriber station communicates with a second user at the second subscriber station. The base station receives the data from the first subscriber station and sends these data to the base station serving the second subscriber station. Depending on the location of the subscriber stations they shall be served by one base station or multiple base stations. In any case, the base station serving the second subscriber station sends the data in a straight line. Instead of communicating with the second subscriber station one subscriber station may also communicate with the ground network (e.g. the Internet) through a connection with a serving base station. In wireless communication systems, for example systems, the relevant standard IS-95 signals direct lines of communication and signals the return line connection are transmitted in non-overlapping frequency ranges.

The telephone system consists of two segments: wireless subsystem and the wireless subsystem. A wired system is a public switched telephone network (PSTN) and the Internet. This subsystem can also include measuring equipment, video, or other services. Wireless subsystem includes a subsystem of base stations, in which there is a switching center mobile communications (MSC), base station controller (BSC), register the location of their own subscribers (HLR), the register location of visitors (VLR), a base transceiver transmitting station (BTS) and mobile station (MS).

Figure 1 shows an example system 100 connection that supports multiple users and is capable of implementing at least some of the aspects presented here, p is the embodiment of the invention. System 100 provides communication for a few hundred 102A-102G, each of which is served by a corresponding base station (BS) A-104G, respectively. In this exemplary embodiment, some of the base stations 104 have multiple receiving antennas, while others have only one receiving antenna. Similarly, some of the base stations 104 have multiple transmitting antennas, and the others each have one transmitting antenna. There are no restrictions on the combination of transmitting antennas and receiving antennas. Therefore, it is possible that the base station 104 will have multiple transmitting antennas and one receiving antenna, to have a number of receiving antennas and one transmitting antenna or to have a transmitting and receiving antenna and the multiple transmitting and multiple receiving antennas.

Mobile station (MS) 106 in the area of coverage can be fixed (i.e. stationary) or mobile. As shown in figure 1, different station MS 106 are dispersed throughout the system. Each terminal 106 communicates with at least one, and possibly multiple base stations 104 on the downlink and uplink communication at any given time depending on, for example, whether soft transfer or intended and used if the terminal (simultaneous or settlement is dovetailing) receive multiple transmissions from multiple base stations. Soft transfer service in CDMA communication systems are well known to experts in the art and are described in detail in U.S. patent No. 5101501 "Method and system for providing a Soft Handoff in a CDMA Cellular Telephone System", the rights to which are owned by the assignee of the present invention and the entire contents of which are included here by reference.

Downward communication refers to the transmission from station BS to the station MS, and upward communication refers to the transmission from station MS to the station BS. In this exemplary embodiment, some of the stations MS 106 have multiple receiving antennas and others have only one receiving antenna. Figure 1 station BS A transmits data to station MS A and 106J down the line, station BS B transmits data to station MS V and 106J, station BS S transmits data to the terminal S etc.

Increasing demands on wireless data transfer and extension services available through wireless technology, has led to the emergence of specialized data services. With the increase in the volume of data transmitted and the number of transmission is becoming increasingly important for effective use of available bandwidth. In addition, becoming a serious problem of mutual interference. The channel parameters may determine, the exercise of any transmission can be effective. Therefore, there is a need in the JV is the way to hash the mobile stations according to the multitude of ranges without unnecessary changes of frequencies. In an exemplary embodiment of the invention, the system 100 shown in figure 1, corresponds to a CDMA2000 wireless communication system.

Figure 2 shows the States through which the mobile station during call processing in a wireless communication system CDMA2000. Figure 2 summarizes state (200) when the call is processed. The call starts when the power is turned on (202) station MS. After power-station MS moves to a state 210 initialization of the mobile station. In the initialization state, the mobile station she handles the channels of the pilot signal and the sync detection and sync with the CDMA system. After the transition to the initialization state station MS starts to perform operations in analog mode as part of the state 206 initialization tasks. As soon as the task initialization (206) is completed, the operation in analog mode ends, as the mobile station has fully acquired the system timing. After purchasing the system timing of the mobile station moves to a state 214 of the vacancy.

While in the idle state, the mobile station monitors the paging channel or direct common control channel (F-CCH) to receive service messages and messages sent to this mobile station (e.g., paging messages is, indicates an incoming call) from station BS. When the station MS is in state 214 unemployment, can also be performed capacity management. In addition, the station MS monitors the control channel broadcast (BCCH), performs registration, switching mode unemployment and carries out positioning. These steps are required for the assignment of the frequency range and frequency for station MS. Message paging channel may require the mobile station answer by sending a confirmation message (ACK), initiating a call or complete the registration. If the station MS is not capable of reception on the paging channel, it can return to the state 210 initialization of the mobile station.

Being able 222 system access, station MS sends messages to the base station BS on the access channel or channel accessibility. Station BS listens to these channels and is responsible station MS or paging channel, or channel F-CCH. Station MS receives the ACK transmission on the access channel, different from the message initiating a call or paging response message.

Being able 230 control mobile station on the channel traffic, station BS and the stations MS communicate using a dedicated forward and reverse traffic channels, which n the day the user information, for example, the speech and data.

Figure 3 shows one example of a communication system that supports data transmission and adapted to schedule transmission to multiple users. Figure 3 shows the operation of the base stations 104 of figure 1. Figure 3 is described in detail below, where, in particular, the base station 320 and the controller 310 (BSC) base station communicate with the interface 306 packet network. The controller 310 of the base station includes a scheduler 312 channels for scheduling transmission in the system 200. The scheduler 312 channels determines which data must be transmitted.

In addition, the scheduler 312 selects channels for transmission of specific data queue. Then from the queue 330 data is retrieved corresponding to the amount of data to be transmitted, served in a channel element 326 for transmission to a remote station associated with the queue data 330. As discussed below, the channel scheduler 312 selects the queue to provide data that is passed to the subsequent transfer.

The controller 310 of the base station can contain many selector elements 316, while figure 3 for simplicity, shows only one such element. Each selector element 316 is assigned to the control message between the one or more base stations 320 and one mobile station (not shown). If this remotely the station selector element 316 has not been assigned, the processor 318 call management is informed about the necessity to establish paging communication with the remote station. Then, the controller 318 call control instructs the base station 320 to establish communications with the remote station.

Source data 302 contains a certain amount of data that must be sent to the specified remote station. Source data 302 provides the data interface 306 packet network. The interface 306 network packet receives data and sends it to the selector element 316. Then the selector element 316 transmits the data of each station BS 320 in relation to the planned remote mobile station. In this exemplary embodiment, each base station 320 maintains a queue of data 330, which stores data to be transferred to the said station MS.

Station MS starts the initialization process when you call. First station MS determines the type of timing system by searching for a used pilot signals. The pilot signal carries no information, but the station MS may adjust its own timing by correlating with the pilot signal. When this correlation is found, the station MS is synchronized with the sync channel and be able to read the message channel synchronization to further Refine its time for the different ratios. Station MS can search for up to 15 seconds on a single CDMA channel before it will be declared a failure, and station MS will return to operation of the system definition to select another channel or another system. The search process is not standardized, and the time required for the detection system may depend on the variant of implementation of the system.

In the CDMA2000 system in a single CDMA channel may be many channels, pilot signals. These pilot signals may include orthogonal pilot signals with diversity transmission, the pilot signals with extended time intervals and auxiliary pilot signals. During the detection system of the mobile station is not able to detect any of these pilot signals, since these pilot signals have different Walsh codes, and during the discovery process, the mobile station searches for only the Walsh code 0.

Once the mobile station has entered into synchronism, she reads the message channel synchronization to further Refine their temporal relation. Figure 4 shows the fields and values of the length fields found in the message channel synchronization. The message of the sync channel is transmitted continuously through the channel synchronization. This message provides the mobile station information to Refine its temporal relation and read the paging channel. Normally, when each PE is edache message channel synchronization change only the fields LC_STATE and SYS_TIME.

The mobile station receives information from the base station in the message channel synchronization, which allows you to determine whether you can establish communication with this base station. This information is in the message channel synchronization in the following fields:

MOB_P_REV - This field contains a value representing the maximum Protocol version supported by this mobile station. This value is stored by the mobile station.

P_REV - Maximum Protocol version supported by the base station.

MIN_P_REV - Minimum Protocol version mobile station which supports the base station. If the mobile station has detected the sync channel and MOB_P_REV < MIN_P_REV, it will not attempt to obtain service on this system and will return to the operation determining system to try to choose another system.

P_REV_IN_USE is the Value calculated by the mobile station, which is the Protocol version currently in use by the mobile station. Whenever the mobile station receives a message channel synchronization, it sets the value of the P_REV_IN_USE equal to the lower of P_REV and MOB_P_REV. The mobile station will not request services or functions that are not supported P_REV_IN_USE.

Once the mobile station has completed the operation of the detection system, it re the result in the idle state. The term "idle state" is not quite correct. The mobile station can be very heavily loaded in the idle state. In the General case, the mobile station receives one of the paging channels and processes the message on this channel. Service message or a configuration message are compared with the stored sequence numbers to provide the mobile station with the most recent values of the parameters. Messages sent to the mobile station, check to identify the subscriber to which they are intended. While in the idle state, the mobile station may perform the following functions:

perform continuous monitoring paging channel;

the implementation of registration procedures;

generating a response to the processing operation of the service information (in response to message system parameters message with the list of neighbors, the message CDMA channel list or message access parameters);

the operation coordination paging of the mobile station;

the operation command processing and processing messages for the mobile station;

the operation of initiating a call to the mobile station;

the operation send the message, the mobile station if the user gave the instruction to send the message.

executing op is the radio power of the mobile station.

In the CDMA2000 system uses four additional service message. The message with the user identification zone, a message with a list of private neighbors, extended message forwarding global services and extended message CDMA channel list.

The message with the identity of the user area, and a message with a list of private neighbors used to support multi-level CDMA services.

Extended message about global forwarding service forwards the mobile station in another system. The advanced form of this message includes forwarding the mobile station depending on its version of the Protocol.

Message with an extended list of CDMA provides the mobile station a list of CDMA channels used by the system. The advanced form of this message includes information about the availability of channels of high-speed paging communication and information indicating whether it supports the diversity transmission in the existing CDMA channels.

The base station may support multiple paging channels (Walsh functions) and/or multiple CDMA channels (frequencies). The mobile station uses a hash function based on its international mobile subscriber identity (IMSI)to determine which channel and what kind of frequency control in the idle state. The base is tance uses the same hash function to determine what channel and what frequency to use when implementing paging communication with the mobile station.

Figure 5 shows the stages of hash functions for the forward paging channel (F-PCH). The mobile station always starts using primary paging channel, which is transmitted on channel 1 Walsh. The message system parameters indicates whether multiple Walsh channels, and if so, the mobile station uses a hash function to select a new channel. The message system parameters also indicates whether the message is sent with an extended list of channels CDMA (CDMA2000) F-PCH.

The method 500 hashing begins with the fact that at step 502, the mobile station detects the sync channel. At step 506, the mobile station detects a paging channel (channel 1 Walsh). After detecting the paging channel the mobile station at step 510 receives a message with the system parameters. Next, at step 514, the mobile station determines whether the system uses multiple paging channels. If the system really uses a lot of paging channels, then at step 518 is selected with the new Walsh code for the paging channel. After selecting the new Walsh code for the paging channel the mobile station at step 522 receives a message with the system parameters. If the system does not IP the leverages your multiple paging channels, the next stage of the process (step 530) is to determine whether sent to the extended CDMA channel list. If the system uses multiple paging channels, after the selection, at step 518 the new Walsh code for the paging channel and receiving on the stage 522 messages system parameters the mobile station proceeds to step 530 to determine whether there was sent to the extended CDMA channel list. If the message extended CDMA channel list has been sent, it is received at step 534. If the mobile station has not received the extended CDMA channel list, it is at the stage 526 receives a message with a list of CDMA channels. If the mobile station receives a message with a list of CDMA channels, it is at the stage 554 determines whether sent at the moment many of CDMA channels. If Yes, then the mobile station at step 560 uses a hash function to select a new frequency is tuned to this frequency and starts with the receipt and processing of service messages. If we send only one channel, then the mobile station at step 564 continues processing in the idle state.

If the mobile station at step 534 receives the message extended CDMA channel list, it determines at step 538 whether or not the base station and mobile station for high-speed paging channel (QPCH) or the configuration of the radio communication PR is fishaut 2. If Yes, then the base station in the message indicates which frequency CDMA support these capabilities, the mobile station selects only from the specified channels. At step 542 determines whether the system supports multiple CDMA channels. If not, the mobile station continues at step 550, the processing in the idle state. If Yes, then the mobile station proceeds to step 546 to the channel selection as described above.

Registration is the process by which a mobile station is a cellular system information about your location. Cellular systems use registration for load balancing between access channel and the paging channel. The above method of hashing is implemented together with the registration for the assignment of frequencies in accordance with the operations Desk, leveling the load. Without performing a registration of a certain type between the mobile stations would have to implement paging through the entire cellular system, which would result in the need to transfer multiple paging messages for delivery to each call in the system with multiple base stations. The mobile station would have to set paging as many times as base stations included in the system.

The requirement for the mobile station to register every time, is when it enters the coverage area of a new base station, increases the number of required paging transmission. Because the transmission of messages for registration and confirmations can occur excessive load on the paging channels of communication, and on the access channels.

In CDMA systems offer many options for initiating registration. Registration of various types can be run or be blocked independently, which allows mobile operators to adapt any subset of the ways you can check to optimize their systems. How to register selected by the operator, depend on such parameters as the size of the cellular communication system, the expected mobility within the system and statistics delivery calls. The base station selects the types of registration, the supported fields in the message with the system settings, advanced message system parameters message with the system parameter ANSI-41.

The CDMA2000 supports ten ways to register. These methods include check-in, power up, power down, and registration-based timer, distance, area, registration command, the hidden registration check-in, channel traffic, based on the parameters and on the basis of the user area.

In the CDMA2000 system is also non-Autonomous registration. Nonautonomous considered the trail is the following types of registration.

Registration for team Mobile station is registered in the system after the base station has sent a command to register.

Check channel traffic, the base station can provide registration of the mobile station by sending commands status request to channel traffic and receiving a response message status. Then the base station can notify the mobile station that it is registered by sending a registration message of the mobile station.

Registration on the basis of changes of parameters of the Mobile station registers when it changed certain parameters that affect the delivery process calls. These parameters are: the label of the class a mobile station, the preferred clock cycle and the indicator of the completed call to the mobile station.

Hidden check - Hidden registration is performed when the mobile station successfully sends a message initiating a call or paging response message. These messages contain enough information to identify the mobile station and its location.

Registration is based on a custom zone For tiered services, supported by CDMA2000 system, you may have to register the mobile station, when it is included in the user area.

The method of registration, wybir is the range operator, depends on such parameters as the size of the cellular communication system, the expected mobility within the system and statistics delivery calls. Since the systems may differ in these parameters in the specifications CDMA offers many ways of registration described above. Various registration procedures can be initiated or blocked regardless of whether the operator to optimize the use of its system.

Registration is performed via the login message. Figure 6 shows the message structure of the registration. Field REG TYPE is used to specify options for registration: a timer-based, on power, on the basis of area, power, based on changes of parameters on the command or on the basis of the distance.

Registration may be of two types: Autonomous and nonautonomous. For offline registration, the mobile station initiates a registration in response to an event without direct instruction register from the controller to the base station. There are six forms of Autonomous registration, as discussed below.

Check power-on Mobile station registers when it is connected to the power supply disconnected from the alternative service system or disconnects from the use of analogues of the th system.

Check for power failure, the Mobile station registers when it is disconnected from the power supply, if it was previously registered in the current service system.

Registration timer-based Mobile station is registered in the timer has expired.

Registration on the basis of the distance of the Mobile station is registered, when the distance between the current serving hundredth and serving hundredth, in which it last registered exceeds the threshold value.

Registration is based on the zone the Mobile station is registered when it enters a new zone.

Various forms of offline registration can globally be triggered or blocked by the base station controller. Registration forms are initiated, and the corresponding registration parameters are passed in the message on the paging channels of CDMA.

Online registration methods include: the registration team, by channel traffic, based on changes of the parameters and the hidden registration. All online registration methods provide the ability to update the register location of own subscribers (HLR)/register visitor locations (VLR) in response to commands on the paging channel or the use of the access channel or channel t is the Afik.

The cellular system can learn about the emergence of mobile stations in its coverage area, which it does not have all the necessary information for delivery call (for example, after receiving a message initiating a call from a mobile station). In this case, the cellular system can command the mobile station to register with a query command.

7 shows the structure of the query command and the fields contained in this command. The mobile station responds to the command request by sending a registration message on the access channel, and updates its data structures as with any other register.

Another option non-Autonomous registration is to register on the channel traffic. Check channel traffic refers to the way in which a mobile station receives information related to registration, by channel traffic. Because the information exchange channel traffic causes less interference to other users than the exchanges carried out by channel paging and access channels, the CDMA system can provide information to register on the channel traffic that prevents many repetitions automatic registration after the call. One of the examples of when you may experience such registrations are calls that generate inter-PE is Adachi service.

For registration information may be provided to the mobile station after receiving from the mobile station team separation and to transmit to the mobile station team separation. At this point, the exchanges of information between the base station and the mobile station does not affect the quality of speech transmission.

On Fig shows the structure of a registration on the basis of changes of the parameters. Some parameters in the mobile station can directly influence the process of delivery of calls to this mobile station, and therefore, they should be updated in the system when each change. These parameters are: the label of the class a mobile station (SCM), the preferred clock cycle and the indicator of the completed call to the mobile station.

Tag SCM may change in the mobile stations, which may be secured to the vehicle with their removal and use as a portable phone. Because of these different cases, the mobile station will transmit with different power levels and have different capabilities for receiving, the base station should know about this change, as it will be able to use this information in its algorithm delivery calls.

The index of the preferred clock cycle refers to the ability of certain CDMA phones to control p is judgingby channel only at selected time intervals, thus reducing the processing load and increasing the battery life. The base station, which tries to establish communications with the mobile station must have information about the clock cycle used by the mobile station, so that it was implemented paging in those intervals in which the mobile station monitors the paging channel.

Finally, the mobile station supports the indicator end the call. CDMA phone can be programmed independently to receive calls while in the coverage area of a base station belonging to the system from which the service is provided ("home" system), while roaming in the back-end system, but in another network (Romer network identification "NID"), or when roaming in another system (Romer system identification "SID").

Therefore, the indicator of the completion of the call depends on the roaming mobile station and preferences when the call is programmed for this roaming state. If the indicator of the completion of the call changes or due to changes in the roaming state, either because of a change in preferences, the base station must be notified so that it can determine whether the transmitted paging message to the given mobile station.

Hidden registration voznikayet, when the mobile station and the base station exchange messages that do not directly relate to the Desk, but bring in a cellular system enough information to identify the mobile station and its location (in the coverage area of the base station).

For compatibility with other registration schemes used in other wireless communication systems, the mobile station considers that it has carried out the hidden registration only after a successful transmission of a message initiating a call or paging response message.

During normal operation, the mobile station may provide the system with status updates, messages about the initiation of a call and response paging messages. This feature reduces the number of required messages for registration.

Figure 9 shows the fields that you want to have a message about the initiation of the call. The message initiating the challenge sent by the mobile station, contains enough information for a hidden Desk station MS.

Well-known a number of problems related to the paging of mobile stations that are near the boundaries of the system. One of these problems is the definition of the relevant base station controller (BSC) for paging communication with a mobile station that moves from the ne system to another. Offline registration after each transition from one system to another helps, but may not completely solve the problem. Since registration may not be instant, there is always some period of time during which the register of the location of its own subscribers (HLR) there is no information that the mobile station has changed one service system to another.

If the offline registration takes place at each entrance to the mobile station in the cell in a new serving system, there is another problem: the mobile station, which are recorded after each change of service system, can produce an excessive number of requests for registration when moving along the boundary of the system. This is because under the influence of changing radio propagation conditions it is possible to quickly change from one service system to another, which is optimal from the point of view of the moving mobile station.

The mobile station maintains a list (SID_NID_LIST) identification numbers of systems (SIDS) and identification numbers of networks (NID), in which it is registered. When the mobile station is registered in a given pair (SID/NID), it adds this pair in the list and starts the timer for the pair corresponding to the specified identification number SID and NID, where she was remeasurereserves. If the mobile station returns to the coverage area of a base station that belongs to the pair (SID/NID) in its list, it will not be re-registered. Once the timer has expired, the mobile station removes a couple of associated with a timer from the list. If the mobile station is in the coverage area of a base station belonging to the pair (SID/NID), at which time the timer has expired, it preregistered by adding this pair back to the list without the timer.

Station BS can control the memorization of many rooms SID and/or NID list SID_NID_LIST by using parameters MULT_SIDS and MULT_NIDS sent in the message with the system settings.

Figure 10 shows the fields and values of the length field in the message with the system parameters. When the field MULT_SIDS set to zero, the mobile station will not store a lot of entries with identical numbers SID. Thus, when it registers a specific pair (SID, NID), it removes from the list the other pair has a different SID, if any. Similarly, when the field MULT_NIDS set to zero, the mobile station stores only one pair (SID, NID) for each non NID, where it is registered.

The message system parameters determines what types of registration should be used in the system. Based on this service messages, mobile hundred is tion may determine, what types should be used, as well as to determine the values of the operation.

Field REG_ZONE set in accordance with the registration area of the base station. Field TOTAL_ZONES set equal to the number of registration zones, which should keep the mobile station to register on the basis of the zone. Field ZONE_TIMER sets the timer register area used by the mobile station. The value of the field ZONE_TIMER is in the range from 1 to 60 minutes.

The most important part of the registration process is the assignment of a mobile station operating frequency. The assignment of frequencies also affect the operation of the system as a whole. The mobile station must be spread across multiple frequencies and ranges, so as to minimize mutual interference and to maintain the system operating parameters at their optimal ranges. The purpose of the registration process includes the distribution of unoccupied mobile stations frequency range, minimizing the time you implement changes in the registration process, minimization of message exchanges, especially for registrations when changing ranges, with the exception of forwarding and re-assignment of frequencies to mobile stations and eliminating the second paging channel, which has a negative effect on the use of power and requires a second Walsh code.

The modification process is hashing leads to improved performance of the system. System performance can be improved if the hashing can alternately initiate and block through the frequency bands. Additional improvement of the performance of the system is possible, if the weight of the hash will also be engaged and locked by its frequency range. In case of overlapping frequency bands may be provided with hysteresis for registrations with frequency diversity using overlapping zones paging communications to ensure the reach of mobile stations in overlapping frequency bands. In embodiments of the present invention offers the above features of the hash.

Discussed above improvements can be implemented by modifying the hashing process. In one embodiment, it is possible to use different registration periods for different classes of mobile stations. This allows the network to share the mobile station classes, for example, with normal and reduced mobility. For mobile stations with limited mobility, that is, those that are moving slowly or not moving through the system, you can allow a longer registration period.

In one embodiment, the present invention features an improved mechanism for the distribution of mobile stations in frequency bands by applying MIDI batonnage hashing using message extended CDMA channel list (ECCLM).

In the next version resolves the request queue for ranges or subclasses for the network using official channels. This can solve the problem of frequent registrations due to changes in the frequency band of the mobile station.

In one embodiment, the invention provides improvements messages ECCLM to improve hashing. These modifications allow you to perform hashing on the basis MOB_P_REV. This gives the ability to perform hashing on the basis of the maximum Protocol version of this mobile station.

In yet another variant allowed the uneven distribution of mobile stations over a range of frequencies through hash-based weights. This can be done by adding a message ECCLM a new parameter, the weight frequency for each frequency to specify the weight associated with that frequency. These weights frequencies are taken into account when hashing, i.e. the higher the weight assigned to the frequency, the more mobile stations is hashed on this frequency.

In the next version is the ability to perform mehdipatnam hashing. It can be done by adding a class of frequency range and parameter subclass of the frequency range to each listed in the list of frequency. These objectives are achieved by adding information about the range to the existing frequencies in the current part of the message is Oia ECCLM. Operating frequencies are those frequencies that are used in existing systems IS-95.

A mobile station can hachirogata frequency in another subclass of range or in another class range. Information about sub-band allows you to process two-level hashing. Two-level hashing reduces the number of cases of change of range, when the mobile station is in idle state. In this embodiment, the mobile station directly enters the idle mode. This action reduces the number of transitions to an idle state in a new band or a new frequency. It is understood that this action will be used when covering different frequency ranges are equal.

Figure 11 shows the hashing-based weights in combination with the logic 1/2 duplex hashing, as described in the previous paragraphs.

The above improvements allow the mobile station to avoid registration if the message ECCLM led to the changing of the frequency range. This leads to a small consumption of system resources, since the mobile station does not spend wasting battery energy to receive messages pager, and forwarding. Furthermore, the reduced consumption of system resources, because the system will need to send less messages the deposits, to hash the mobile station on the frequency.

Two-level hashing reduces the number of shift ranges of the mobile station when it moves from a state of unemployment, processes the new message ECCLM and in the end turns out to be in the same range, which it previously used. In addition, a two-level hashing isolates hashing in the frequency range, giving the possibility of re-hashing in the frequency range, if necessary.

On Fig illustrates the stages of a two-level hashing one variant of the invention. The process 1200 begins when the mobile station scans the channels contained in the message ECCLM, and excludes those channels that it does not support, and then sorts the ranges and frequency to provide a stable hashing base stations. Previously from mobile stations required to support all channels. After the introduction of new classes of ranges that extend beyond the current ranges, such support in the future is not guaranteed. After viewing the channel list in the message ECCLM at step 1206 station MS is hashed in the range with respect to the total weight assigned to the channels in this range. At step 1210 station MS excludes those channels in message ECCLM that are outside the selected frequency band. At step 1214 station MS hashes the I channel, located in the selected frequency range with the assigned weights.

MediaPhone hashing is a potential problem that requires solution. Station MS may not support all frequency bands or subclasses of frequency bands included in the message ECCLM. Station MS for frequency selection should quickly see these frequency ranges or subclasses of the frequency bands. Sorting provides a mechanism to remove unsupported subclasses. However, the base station need to know what frequency ranges or subclasses of frequency bands supports this station MS. In service messages, the base station specifies which frequency bands and sub frequency bands deployed in this sector. At each registration station MS indicates which ones are in the list of base stations are supported by this station MS. The network may also make your request, in order to find out which frequency bands and sub frequency bands supported. This information is received via the status request received by the switching center mobile communications (MSC). Centre MCS pulls this information to each base station controller (BSC) when sending a message to the station MS. Even when using mehdipatnam hashing station MS must still issue LNAT registration on the basis of the power supply every time when it changes frequency range or a subclass of the frequency range.

On Fig shows a two-tier hashing with the assigned weights. Message ECCLM for class 2 ranges transmitted by at least one mobile station. Mobile station sorts the third list of CDMA channels and discards frequency, for example a frequency of 3 in division 1 are not supported. Then, a process of two-level hashing, as described above. Sorting ranges and frequencies provides a stable hashing base stations.

In an additional embodiment, the base station indicates in service messages interesting frequency range or a subclass of the frequency range. The mobile station may indicate its capabilities during registration.

In yet another variant, it is proposed that station MS showed any change in the capabilities of the hardware by using one bit in the registration process. Centre MSC queries the station MS about its features and uses this information for subsequent messages pager. Specified one bit is added to register, indicates a change in the equipment of the mobile station. This forces the network to request the stations MS or other hardware capabilities.

Thus, there has been described a new and improved method and device is the primary objective for scheduling transmissions in a communication system. Specialists in the art should be obvious that the data, instructions, commands, information, signals, bits, symbols, and data elements that are referred to in the above description, mainly represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof. In addition, specialists in the art should be obvious that the various illustrative logical blocks, modules, circuits, and steps of the algorithms described in connection with the disclosures provided here variants of the invention may be implemented as electronic hardware, computer software, or combinations thereof. Various illustrative components, blocks, modules, circuits, and steps have been described in General from the point of view of their functionality. As specifically implemented their functionality, i.e. hardware or software depends upon the particular application and design constraints imposed on the system as a whole. Specialists in this field of technology determine the interchangeability of hardware and software in these circumstances, and how best to implement the described functionality for each specific application. For example, various Illustra the sector logical blocks, modules, circuits, and steps of the algorithms described in connection with the disclosures provided here variants of the invention may be performed or implemented using a digital signal processor (DSP), application of specialized integrated circuit (ASIC); gate arrays, programmable by the user (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, such as, for example, registers and FIFO memory; a processor that executes a set of software and hardware commands; any standard programmable software module and a processor, or any combination thereof designed to perform as described here functions. The processor can mainly be a microprocessor, but in an alternative embodiment, the processor may be a standard processor, controller, microcontroller, programmable logic device, a matrix of logic elements or finite state machine. A software module may reside in random access memory (RAM), flash memory, read-only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, removable disk, ROM, CD-ROM (CD-ROM) or any other form of storage medium known in the art. An exemplary processor is mainly connected with the carrier of the data, in order to read from it and write information. In an alternative embodiment, the media data can be integrated into the processor. The processor and the storage medium may reside in an ASIC scheme. Diagram of the ASIC may reside in a phone or other user terminal. In an alternative embodiment, the processor and the storage medium may be in the phone or other user terminal. The processor may be implemented as a combination of processor DSDP and the microprocessor or in the form of two microprocessors in conjunction with a DSP core, etc.

As for other options, specialists in the art it should be clear that the foregoing methods may be implemented as a result of execution of a program, embodied on a machine-readable medium such as a memory of the computer platform. Teams may be in different types of primary, secondary and tertiary storage media or mediums that carry the signals. The medium may contain, for example, random access memory (RAM)accessible by the client device and/or server or in the client device and/or server. Regardless of where the RAM on a floppy disk or other secondary storage media, the commands can be stored on many different readable data carriers, such as memory with direct access (DASD) (for example, the standard is the first hard disk drive or a matrix of disk drives with redundancy (RAID)), magnetic tape, electronic memory to read-only, such as ROM or EEPROM, flash memory, optical storage device (e.g., CD-ROM, CD-ROM, WORM, DVD, digital optical tape), paper punch cards, or other suitable storage media, including environment for digital and analog transmission.

Although in the above description shows illustrative embodiments of the invention, it should be noted that they can be made various changes and modifications within the scope of the invention defined by the attached claims. Steps or stages in the claims relating to the method as described here variants of the invention need not necessarily be performed in any particular order. Furthermore, although elements of the invention may be described or claimed in the singular, it is assumed plural, if the constraint on uniqueness is not specifically limited.

So, here shown and described the preferred variants of the present invention. However, specialists in the art should be obvious that disclosed here can be made many changes within the essence and scope of the invention. Therefore, the present invention is not limited except as compliance with agemay the claims.

1. The method of performing the two-level, based on the scales
hash containing phases in which
take the list of classes of the frequency range, each of the mentioned classes of the frequency range has an assigned weight;
hairout mobile station in class a frequency range on the basis of the weight assigned to each of the frequencies;
take the list of subclasses of the frequency range for a class a frequency range in which hairouna mobile station, and each subclass has an assigned weight;
hairout mobile station in a channel of a subclass in the class range, based on the weight assigned to each of these frequencies contained in the subclass; and
use the mentioned channel for subsequent exchange of information.

2. The method according to claim 1, additionally containing phase, in which, after the step of receiving exclude frequencies from consideration for further exchange of information, if they are not supported by the mobile station.

3. The method according to claim 1, additionally containing phase, in which, after the step of hashing a mobile station in a frequency range exclude frequencies outside of the frequency range, from consideration for further exchange of information.

4. The method according to claim 1, wherein the assigned weight permit uneven distribution of mobile the device over a range of frequencies.

5. The method according to claim 1, wherein hashing is based on the maximum Protocol version of the mobile device.

6. The method according to claim 1, additionally containing a request queue that includes at least one of the range and subclass of the network, via the service channel.

7. The method according to claim 1, additionally containing phase, which use the registration period on the basis of the class of mobile devices.

8. The method according to claim 7, in which the class includes at least one mobility selected from the group consisting of normal mobility and limited mobility.

9. The method according to claim 1, wherein the hashing alternately initiate and block of frequency ranges.

10. The method according to claim 1, in which the weight hashing uses and block of frequency ranges.

11. The method according to claim 9, in which the weight hashing uses and block of frequency ranges.

12. The device for performing the two-level, based on the scales hashing operating in the wireless communication system containing a processor, configured to receive a list of classes of the frequency range, each of the named classes the frequency range is assigned a weight, hashing a mobile station to class of frequency range on the basis of the weight assigned to each of the frequencies, receiving the list after inserting the Asses of the frequency range for the class frequency range, in which hairouna mobile station, and each subclass has an assigned weight, hashing a mobile station to a channel of a subclass in the class range, based on the weight assigned to each of these frequencies contained in the subclass, and use of the channel for the subsequent exchange of information; and a memory connected to the processor, for storing data.

13. The device according to item 12, in which the said processor is additionally intended to exclude after receiving frequency list frequency from consideration for further exchange of information, if they are not supported by the mobile station.

14. The device according to item 12, in which the said processor is additionally intended to exclude after hashing a mobile station in a frequency band of frequencies that are outside of the frequency range, from consideration for further exchange of information.

15. The device for performing the two-level, based on the scales hashing operating in the wireless communications system containing means for receiving a list of classes of the frequency range, each of the mentioned classes of the frequency range has an assigned weight; means for hashing a mobile station to class of frequency range on the basis of the weight assigned to each of the frequencies;
media is the primary objective for the reception of the list of subclasses of the frequency range for the class frequency range, in which hairouna mobile station, and each subclass has an assigned weight;
means for hashing a mobile station to a channel of a subclass in the class range, based on the weight assigned to each of these frequencies contained in the subclass; and
tool for use of the channel for the subsequent exchange of information.

16. The device according to item 15, in which the assigned weight permit uneven distribution of mobile devices over a range of frequencies.

17. The device according to item 15, in which hashing is based on the maximum Protocol version of the mobile device.

18. The device of clause 15, further comprising
tool to query the queue, which includes,
at least one of the range and subclass of the network, via the service channel.

19. The device of clause 15, further containing a means for use of the registration period on the basis of the class of mobile devices.

20. The device according to claim 19, in which the class includes at least one mobility selected from the group consisting of normal mobility and limited mobility.

21. The device according to item 15, in which the hashing turn is initiated and is blocked by its frequency range.

22. The device according to item 15, in which the weight of the hash are utilized and are blocked by chaston the m range.

23. The device according to item 21, in which the weight of the hash are used and locked by its frequency range.

24. Machine-readable storage medium containing executable computer commands stored thereon, for execution by a processor to perform a method of performing a two-level, based on the scales hash containing phases, which take a list of classes of the frequency range, each of the mentioned classes of the frequency range has an assigned weight;
hairout mobile station in class a frequency range on the basis of the weight assigned to each of the frequencies;
take the list of subclasses of the frequency range for a class a frequency range in which hairouna mobile station, and each subclass has an assigned weight;
hairout mobile station in a channel of a subclass in the class range, based on the weight assigned to each of these frequencies contained in the subclass; and
use the mentioned channel for subsequent exchange of information.



 

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