Method and device control service channel in mobile communication system

 

(57) Abstract:

The claimed method and device for controlling a service channel of a base station in a mobile communication system. The method includes a calculation load of the base station, if the calculated load reaches a threshold, the transmission request message assignment of an additional service channel processor interface Board channels and additional destination service channel, and if the calculated load is reduced, the transmission request message unassign service channel processor interface card channel and cancel the said office channel. The technical result is to increase the efficiency and stabilization of the characteristics of mobile communication systems. 2 S. and 4 C.p. f-crystals, table 2, 4 Il.

The technical field

The invention relates to a mobile communication system, and more particularly to a method and apparatus for managing a service channel of a base station to improve the efficiency and stability of the system characteristics, multiple access, code-division multiplexing.

Prior art

In modern systems, multiple access, code division channel is for example the pilot channel signal, channel synchronization channel search call or access channel that is assigned in advance and, thus, operated in the same way. When searching the call to the mobile station through a direct line of communication system mdcr transceiver subsystem base station carries out the search by calling the corresponding terminal through the pre-assigned channel search is called with a specific number (for example 1). In the return line system mdcr permanently assigned channel access with a specific number (for example, 1) is used for establishing a connection between a mobile station and PBS.

However, this method of search call has several disadvantages, as described below. In a straight line communication system mdcr, although there is no overload in PBS when carrying out a search of the calling mobile station with the known exact current location, however, the load PPBS increases when the search call to the mobile station, the current position is not exactly known. Below will be described the causes of problems when searching the call to the mobile station in the absence of accurate information about its location. When searching the call to the mobile station, the current position to which the call implemented a zone containing several PPBS, or unit identification field location. If the position of the mobile station is not known even when the secondary search challenge then is to broadcast the tertiary search call, implemented by the switching center mobile stations (CMS). In this case, in PBS may overload condition due to the heavy traffic, and the system may have a malfunction. In addition, even in the return line system mdcr intensive traffic can be generated because of the increasing calls that are made through the access channel mobile station, in response to the search calls PBS or due to the number of registrations in the system. Therefore, in a limited access channel overload may occur, and the connection between the mobile station and PBS may become unstable.

The invention

Object of the invention is a method and device control service channel PBS to improve the efficiency and stabilization of the characteristics of mobile communication systems.

Another object of the invention is a method and device, Oia load between the straight line and the return line.

In addition, the object of the invention is a method and device that provides dynamic allocation of radio resources by a preliminary prediction of the state of congestion in the service channel, which can be produced in the situation of an urgent nature of radio communications.

In accordance with one aspect of the invention a method of controlling a service channel of a base station in a mobile communication system includes the following operations: calculating a load of the base station; if the calculated load reaches a threshold, the transfer request message assignment of an additional service channel processor interface Board channels and the additional purpose specified service channel; and if the calculated load is reduced, the transfer request message by removing the service channel processor interface Board channels, and cancel the said office channel.

In accordance with another aspect of the invention, the device for controlling a service channel of a base station in a mobile communication system contains a processor of the computing load calculation load of the base station; a memory unit for storage resources connected the channel for transmission in case if the calculated load reaches a threshold level, a request message assignment of an additional service channel processor interface Board channels and assigning additional service channel; and transmitting, if the calculated load is decreased, the request message unassign service channel processor interface card channel and cancel the said office channel.

Brief description of drawings

The above objectives and advantages of the present invention are explained in the description of the preferred variant embodiment of the invention illustrated by the drawings, which represent the following:

Fig. 1 is a block diagram PBS;

Fig. 2 is a diagram showing the load channel search call for traffic straight line, according to a preferred variant implementation of the present invention;

Fig. 3 is a graph showing the load of the access channel for the reverse traffic of the communication line according to a preferred variant implementation of the present invention;

Fig. 4 is a functional block diagram of the device management service channel corresponding to a preferred variant implementation of the present invention.

The present invention provides for the calculation of the maximum traffic that can be generated in the worst case, in a straight line with a given probability generating a call between mobile stations, the call from the mobile station to the ground station, a call from a ground station to the mobile station and the number of bits generated messages when establishing regular communication on call. If the system load approaches the threshold value, it is additionally allocated channels search call for handling the load in the system. In addition, in the return line access channels additionally are given the probability generating the call and traffic generated by the establishment of regular communication on call. This enables the processing system overload, which may occur unexpectedly.

As shown in Fig. 1, transceiver subsystem base station (PBS) 2 connected to a base station controller (ASC) contains a control processor (CP) 10 PPBS, the processor interface Board channels (PIPC) 12 and multiple channel elements (CE) 14-0,..., 14-n.

In terms of mobile communication, when the transmitted signals are subject to fading due to sharp changes in the level of the received signal, it is very important to take into account the load between the straight line and the return line of communication to ensure the effective functioning of the system. In a preferred embodiment of the invention, the throughput of the service channel, which can balance the load in a straight line and the load in the reverse link, is determined, as described below, on the basis of the standards IS-95, IS-95A, J-STD-008 and CAI, which relate to the specification of the air interface.

(1) a Direct line of communication system mdcr.

Assuming that you have normal traffic load full of traffic is calculated by the control processor 10 based on message format specific technical requirements of the air interface IS-95, IS-95A and J-STD-008. If the load is approaching the threshold value, the control processor 10 transmits the request message assignment of an additional service channel processor 12 interface card channel on appolagies, the message used in the channel mdcr a straight line has the following characteristics. This message is based on the standard IS-95.

The message used in a direct line of communication mdcr

1. Service message: 752 bits

It is assumed that the mobile station does not include data verification, a message channel access.

Among the list of neighboring stations is 16

The message parameter systems: 164 bits

The message parameter access: 152 bits

The message of the list of neighboring stations: 264 bits

The message channel list mdcr: 72 bits

2. Message destination channel: 136 bits

3. The command message confirmation from the base station (BS_ACK_ORDER): 112 bits

4. The message command receive confirmation of registration (REG_ACK_ORDER): 112 bits

5. Message retrieval-call in the intervals: 240 bits

It assumes that you are search call 5 mobile stations with a baud rate of 4800 b/s

6. Number of channels per sector: N = 20, 24, 28, 32

7. Average call time: T = 90

8. The probability of blocking: IN = 2%

Provide load A can be represented by a ratio

< / BR>
where PVIS - the call attempt in the interval santostasi (PWIS) per subscriber: S = 1,50

12. The number of institutions call per hour (UHF): UHF = M x S a

13. The General type of emerging challenges (and frequency of exercise)

from the mobile station to the mobile station: 5% (50%)

from the mobile station to the ground station: 65% (85%)

from the ground station to the mobile station: 30% (50%)

14. The data rate in the channel search call: 9600 b/s, 4800 b/s

15. The processing efficiency in the channel search call: 90%

16. It is assumed that the number of registrations is 10. Registration is a procedure performed by the mobile station to inform the base transceiver station about his status, cycle time interval, and other characteristics.

Based on the above assumptions, the characteristic of the total number of bits service message TOMV), which can be generated in a straight line mdcr message service channel in an hour, appears as:

< / BR>
where Overhead_Msg_Period - period transmission messages service channel and Overhead_Msg message service channel.

Feature bits full message destination channel (TSANG), which can be generated in a straight line mdcr message destination Kahn is characteristic total number of bits of the message command receive confirmation of registration (TRAOMB), which can be generated in a straight line mdcr message command receive confirmation of registration per hour, is determined as follows:

TRAOMB = the total number of subscribers (the number of the register./the subscriber) Registration_Ack_Order_Msg bit (5)

where Registration_Ack_Order_Msg message command acknowledgment per hour.

Characteristic total number of message bits validate command from the base station (TOMV), which can be generated in a straight line mdcr message command acknowledgement of reception of the base station in an hour, is defined as follows:

< / BR>
< / BR>
where BS_ Ack_ Order_Msg message command acknowledgement of reception of the base station in an hour.

Characteristic total number of message bits of the search key (TMRW), which can be generated in a straight line mdcr message retrieval-call in intervals of an hour, can be represented as:

< / BR>
where PMM- the probability of a call from the mobile station to the mobile station, PML- the probability of a call from the mobile station to the ground station, PLM- the probability of calls from the ground station to the mobile station, PMME- the probability of error calling from Mountie, FMMfactor that is required to install 100% of the call from the mobile station to the mobile station, FLMfactor that is required to install 100% of the call from the ground station to the mobile station, FGPE - error search call the first group, SGP - search call of the second group, Slotted_Page_Msg message retrieval-call in intervals of an hour.

Characteristic total number of bits (TURN), which can be obtained in a straight line mdcr per hour taking into account equations(3), (4), (5), (6) and (7) can be represented in the following form:

< / BR>
Load channel search call PCH_LOAD corresponding to the data rate in the channel search call PCH_Data_Rate (9600 b/s, 4800 b/s) in a straight line

< / BR>
where PCH_ pro_ performance - the efficiency of processing in the channel search call.

(2) return line connection mdcr.

If you install a normal call, then the message return line connection mdcr contains the message of the source used to determine the source of the message, the response message retrieval call is used to answer search calls from the base transceiver station, and a registration message used for registration. The data rate in canalle access equal to 80% and the number of requests for registration for one subscriber is 10. All access channels specific channel search call, have the same size of the time interval. Before the terminal will transmit the message to the base transceiver station defines the beginning and length of the access channel. The interval of the access channel consists of a preamble channel access and packet message channel access. Thus, the interval of the access channel is defined as (3 + MAX_ CAP_SZ) + (1 + PAM_SZ) (where MAX_CAP_SZ - maximum packet size channel access and PAM_SZ - the size of the preamble channel access). It is assumed that the packet size of the access channel is 4, and the size of the preamble is equal to 1. Thus, the size of the time interval of the access channel is 180 MS.

On the basis of the assumptions load ORLD, which may be formed in the reverse channel mdcr the message source for the hour, is defined as follows:

< / BR>
Load PRLD, which may be formed in the reverse channel mdcr response message to the search call per hour, is calculated as follows:

< / BR>
Load RQLD, which may be formed in the reverse channel mdcr message of the registration request per hour, is calculated as follows:

RQLD = the Number of subscribers the Number of the register. FLM. (12)


TLOAD = ORLD + PRLD + RQLD. (13)

The load of the access channel ACH_LOAD in the reverse channel mdcr can be represented in the following form :

< / BR>
The result of the analysis of traffic in a straight line mdcr are shown in table 1. Table 1 shows the load in accordance with data transmission speeds in the channel search of the call, and it is assumed that a normal call is performed based on the message format standard IS-95.

In table 1, N is the number of channels of traffic, A provided load. The bits of the search call, the bits of the destination channel, bits of acknowledgment bits confirm registration, bits confirm the base station, the bits service messages, bits of search calls in the intervals represent the number of bits generated by each message. LD4800 (%) - load channel search call when the data transfer rate 4800 b/s, LD9600(%) - load channel search call when the data transfer rate of 9600 b/s

In Fig. 2 shows the load channel search call respectively to the data given in table 1. The results, shown in table 1 and Fig. 2, based on the message format according to standard IS-95 and take into account the initial search of the cell. Search mobile station, whose position is not precisely known, carries out the switching center of the mobile stations. If the primary search mobile station is unsuccessful, then the search for this mobile station is carried out by the identification block of the local area. When performing a search calls such mobile stations are searched 279 sectors given base transceiver stations that are in the vicinity of the switching center of the mobile stations. For the secondary search of the call, the search is performed for 10 base transceiver stations, i.e. in 30 sectors, taking into account the base transceiver stations connected to one base station controller. With regard to the primary search calls and secondary search calls, if the data channel search call transmitted at a rate of 4800 b/s (LD4800) and if the number N of channels of traffic is equal to 20, the load exceeds 82%. If the number N of channels of traffic is 24, the load exceeds 100%. Therefore, if the load reaches a threshold (80-85% of full load), the control processor 10 transmits the message to the destination channel search call to the processor 12 interface Board channels, as shown by item (1). If the load decreases until then, the call to the processor 12 interface Board channels as shown by item (2), to unassign service channel. Thus, the load being decentralized, and the system is stable.

The result of the analysis of the traffic in the reverse channel mdcr presented in table 2. Table 2 shows the load corresponding to the data rate of the channel search calls, and assume that is a normal call based message format standard IS-95.

As shown in table 2, N is the number of channels of traffic, A provided load, M is the total number of subscribers, CHS - number of institutions due on call per hour, Orig. - the number of bits generated by the message source, Page Resp. - the number of bits generated response message to the search, Reg.Request - the number of bits generated by the message of the registration request, Total - the total number of bits that can be generated in the reverse channel for hours.

In Fig. 3 shows the load of the access channel, the corresponding data are presented in table 2. The results, shown in table 2 and Fig. 3, based on the message format standard IS-95. In the reverse channel mdcr, if the load of the access channel approaches the threshold value, the control processor 10 transmits the message to the destination channel is available the value is 80-85% of the calculated load.

In Fig. 4 shows the device management service channel control processor 10 shown in Fig. 1. The device management service channel includes a processor 20, the calculation load, the memory unit 30 and the controller 40 of the service channel. The processor 20 to calculate the load calculates the load on the base transceiver station. The memory unit 30 stores the resources related to the appointment of an additional service channel based on the calculated load from the CPU 20 of the calculation load. The controller service channel 40 manages the service channel. For example, the controller 40 official channel detects and cancels further appointed official channel, when the load is reduced. Further, if the load of the base transceiver station 2 is approaching the threshold value (80-85% of the calculated load), the controller 40 official channel control processor 10 transmits the message to the destination (1) the service channel (channel search call and access channel) channel elements 14-0, ..., 14-n through the processor 12 interface Board channels. If the load base transceiver station 2 is reduced to the threshold value or below, the controller 40 service know 14-0,, 14-n through the processor 12 interface Board channels.

As stated above, if the excessive load is applied to the system due to the increasing traffic, it is assigned a service channel (channel search call, and control channel). If the load corresponds to a normal level, the appointment of a service channel is cancelled. So is efficient radio resource management and the stability of the system improves.

Although the above has been described the preferred embodiment of the invention, however, specialists in the art it should be clear that various alterations and modifications and equivalents instead of the means shown without changing the scope of the invention defined by the claims.

1. The method of controlling a service channel of a base station in a mobile communication system, which calculates the load of the base station and comparing it with a threshold value, wherein if the calculated load reaches a threshold, transmit the request message assignment of an additional service channel processor interface Board channels and additionally assign the specified service channel, accessory interface card channel and cancel the said office channel.

2. The method according to p. 1, characterized in that the said threshold value is 80 - 85% of the calculated load.

3. The method according to p. 1, characterized in that the said service channel is a channel search call and channel access.

4. Device to control the auxiliary channel of a base station in a mobile communication system containing a processor of the computing load calculation load of the base station and comparing it with a threshold value, characterized in that it further comprises a memory unit for storage resources associated with the additional value of the service channel based on the calculated load, the controller official channel for transmission, if the calculated load reaches a threshold, a request message assignment of an additional service channel processor interface Board channels and assigning additional service channel, and transmitting, if the calculated load is reduced, request messages unassign service channel processor interface card channel and cancel the said office channel.

5. The device according to p. 4, characterized in that the said threshold value is 80 - 85% of vychislenii channel search call and channel access.

 

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FIELD: radio communications.

SUBSTANCE: proposed method intended for single-ended radio communications between mobile objects whose routes have common initial center involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mentioned mobile objects and destroyed upon completion of radio communications. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

1 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer from mobile object to stationary one residing at initial center of common mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhanced its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile object from stationary one residing at initial center of mobile-object route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile object, these intermediate transceiving drop stations being produced in advance on mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 6 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects whose routes have common initial center involves use of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety for attending personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in simultaneous functioning of several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several other radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method for single-ended radio communications between mobile objects having common initial center involves use of low-power intermediate transceiver stations equipped with non-directional antennas and dropped from mobile objects. Proposed radio communication system is characterized in reduced space requirement and, consequently, in enhanced effectiveness when operating simultaneously with several other radio communication systems.

EFFECT: reduced mass and size, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications.

SUBSTANCE: proposed method intended for data transfer to mobile objects from stationary one residing at initial center of common mobile-objects route using electronic means disposed on stationary and mobile objects involves radio communications with aid of low-power intermediate transceiving stations equipped with non-directional antennas and dropped from first mobile object, these intermediate transceiving drop stations being produced in advance on first mobile object and destroyed upon completion of radio communications between mobile and stationary objects. Proposed radio communication system is characterized in reduced space requirement which enhances its effectiveness in joint functioning with several radio communication systems.

EFFECT: reduced mass and size of transceiver stations, enhanced noise immunity and electromagnetic safety of personnel.

2 cl, 7 dwg, 1 tbl

FIELD: radio communications engineering; digital communications in computer-aided ground-to-air data exchange systems.

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EFFECT: enhanced efficiency due to enhanced throughput capacity of system.

1 cl, 2 dwg

FIELD: radiophone groups servicing distant subscribers.

SUBSTANCE: proposed radiophone system has base station, plurality of distant subscriber stations, group of modems, each affording direct digital synthesizing of any frequency identifying frequency channel within serial time spaces, and cluster controller incorporating means for synchronizing modems with base station and used to submit any of modems to support communications between subscriber stations and base station during sequential time intervals.

EFFECT: enhanced quality of voice information.

12 cl, 11 dwg

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