CN1167559A - Method and apparatus for allocating a communication channel in a communication system - Google Patents

Method and apparatus for allocating a communication channel in a communication system Download PDF

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Publication number
CN1167559A
CN1167559A CN96191304A CN96191304A CN1167559A CN 1167559 A CN1167559 A CN 1167559A CN 96191304 A CN96191304 A CN 96191304A CN 96191304 A CN96191304 A CN 96191304A CN 1167559 A CN1167559 A CN 1167559A
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China
Prior art keywords
communication
channel
available
communication system
communication channel
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Granted
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CN96191304A
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Chinese (zh)
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CN1145371C (en
Inventor
布莱达·凯·赫罗尔德
克里斯蒂那·卡莱·爱奥里蒂
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Motorola Mobility LLC
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Motorola Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Abstract

A communication system (115) receives a paging signal (103) from a mobile station (100) requesting service and, if the paging signal (103) contains information identifying the service request as an emergency (502), a communication channel in a base transceiver station (105, 107, 109) is directly allocated to service the mobile station (100). If a communication channel is not immediately available, the communication system (115) will try to make a communication channel available. A distinct aspect of the communication system (115) is that it monitors an indicator (600) representative of the emergency call traffic on the communication system (115). Based upon the status of the indicator (600), the communication system (115) takes appropriate measures (440) to provide priority service for those mobile stations (100) having a priority access class. By providing priority service in this manner, the communication system (115) efficiently allocates the communication resource to the mobile stations (100) with priority access classes which need those resources urgently.

Description

The method and apparatus of allocation of communication channels in the communication system
Relate generally to communication system of the present invention more specifically, relates to a method and apparatus that preferential access service is provided in radio telephone system.
Wireless communication system is well-known, and it is by comprising the land mobile radio platform, cellular radio, polytypes such as PCS Personal Communications System (PCS) and other communication system composition.For example in cellular radiotelephone communication systems, be linked to a base station controller (BSC) of formation base station system (BSS) usually by many communication units of base transceiver station (BTS) service.All subsequently BSC are linked to a mobile switching centre (MSC), and it provides being connected and the interconnection of all BSS between BSS and public switch telephone network (PSTN).Being operated in mobile communications device (or travelling carriage) in the communication unit scope (MS) utilizes radio communication to send and receives the signal of serving BS broadcasts S.These signals are by BTS, and BSC and MSC handle the communication service of finishing with other MS, or deliver to a landline telephone user by PSTN.
In the mobile phone communication system of a specific type, for example, in the mobile phone communication system of Global Systems for Mobile communications (GSM), BSS sends a signal to all interior MS of its range of signal continuously through Broadcast Control Channel (BCCH).This signal comprises that MS of permission inserts this system's information necessary.In this signal, what acquire a special sense is the information that BSS allows the access grade of this system of access.
GSM suggestion 4.08 has defined three access grades: the normal access, the urgent access and the special service access grade.10 normal access grades (randomly from 0 to 9) are arranged, a urgent access grade (10) and 5 special service access grades (11-15).From now on, when relating to urgent access grade and special service access grade more and more, they are called as, and " preferential access grade will be ' to be different from normal access grade.
Call out in the sequence that starts at a typical MS, MS will enter a communication unit, accept BCCH and determine whether it has the suitable access grade by the BSS service in that unit.If have, then MS asks service by the information signal of one one byte on BSS, and this signal is commonly called one and inserts pulse (RAB) at random, and it is to be sent to BSS on Random Access Channel (RACH).If in a time interval, MS can not receive the response for RAB from BSS, and then MS will suspend and send second RAB.For the sake of security, RAB comprises information seldom, and the information of the special homogeneity that request is not served about MS.So BSS can't differentiate that second RAB is from the MS same with first RAB, and will attempt to serve two kinds of requests, and in fact only need serve a kind of.As a result, the allocative efficiency of the communication resource in a kind of like this system is very low.
Ask for example, may need to insert this system immediately in emergency circumstances the user under the preferential situation about inserting MS user, this phenomenon is debatable especially.Though about the information of MS specific identity (specific identity), it does not comprise an independent position that is called as urgent word (EW) to the RAB of a byte, made when effective as this urgent word, it will discern this request is that urgent an access is asked.EW may make effectively with a kind of in three kinds of modes: MS has a urgent access grade (10); MS has a normal access grade, but is just attempting to carry out a urgent call (promptly 911); Or MS has a special service access grade and is just attempting to carry out a urgent call for example 911.Though identifying service request through EW is an emergency, it is unknown that the specific identity of MS remains.So, cause the situation of the inefficient a plurality of RAB that load of BSS to remain establishment.The result is exactly that the work of BSS is inefficient when the user needs BSS service the most rapidly.
Therefore, need a kind of method and apparatus to be used to provide mobile phone communication system of rapid access to serve preferred access and call out, and be not loaded into this system egregiously, also do not lose the fail safe that current RAB structure is provided.
Fig. 1 usually describes the block diagram of a cellular radiotelephone communication systems, and this system is suitable for embodying preferential access service according to the present invention;
Fig. 2 describes the flow chart of an example, and its explanation is for the embodiment of the prior art call treatment sequence of normal access service request.
Fig. 3 usually describes the block diagram of a mobile phone communication system, and this system embodies the characteristics of preferential access service according to the present invention.
Fig. 4 provides the flow chart of an example, and it illustrates the embodiment according to preferential access service of the present invention;
Fig. 5 usually describes the example according to defined RAB structure in the GSM suggestion 4.08; And
Fig. 6 is the relation between descriptive markup and a ratio usually, and this ratio is the ratio of the number of communication channel available in number and the communication system of the emergency service request that received.
A communication system 115 receives the paging signal 103 of serving from the request of travelling carriage 100, if comprising, paging signal 103 determines that service request is one urgent 502 information, then base transceiver station 105, a communication channel in 107,109 just directly is assigned to serve travelling carriage 100.If communication channel can not used immediately, then communication system 115 will attempt to form an available communication channel.A distinguishing feature of communication system 115 is exactly the mark 600 that emergence call service on the communication system 115 is represented in its monitoring.According to the state of mark 600, communication system 115 adopts suitable method 440 to provide Priority Service which has the travelling carriage 100 of preferential access grade to.Priority Service is provided after this manner, and communication system 115 allocate communications resource is effectively given the travelling carriage that has preferential access grade 100 of emergency resource.
The present invention comprises a communication system 115, and a communication channel in its distribution system is given a user 100 of request emergency services 502.It at first is by receiving the signal 103 that contains emergency service information 502 from user 100 that communication system 115 is finished this work.According to the state that is included in the emergency service information 502 in this signal 103, communication system 115 will directly distribute a communication channel to serve this emergency service request rather than sequence is handled in the standard call of losing time by Fig. 2.In communication channel is not under the very fast spendable situation, and communication system 115 will distribute a control channel to place this emergency service request temporarily, and discharge an acoustic channel simultaneously, thereby produce a new spendable communication channel.New then spendable communication channel is assigned to this emergency service request.
Another characteristics of communication system 115 are in the moment of emergency 404, it at first (proactively) restriction insert those users with preferential access grade.It is by receiving from a plurality of signals 103 corresponding to a plurality of users 100 with preferential access grade that communication system 115 is finished this work; A mark 600 of monitoring representative emergence call service aspect communication system 115, and when mark 600 reaches certain thresholding, except have a preferential access grade 440 those with outdoor, refusal access communication system 115 arrives all other users.So, according to the invention of being stated, another improvement for prior art is that communication system 115 is with trace labelling 600, its representative urgent access load aspect communication system 115, and according to reaching a thresholding, except preferential access request 440, thereby it will be refused all requests and provide optimal service to these users.
The present invention describes with an embodiment, this embodiment and Global Systems for Mobile communications (GSM), and time division multiple access (TDMA) mobile phone communication system is relevant.Those skilled in the art will appreciate that: the present invention can be applicable to the mobile phone communication system of any kind, for example simulates code division multiple access (CDMA) or other TDMA type.With reference to figure 1, the block diagram of the cellular radiotelephone communication systems of an example has been described here, this system is suitable for embodying according to preferential access service of the present invention.What be shown in Fig. 1 is a mobile phone communication system, and it comprises a plurality of base transceiver stations (BTS) 105-109 by base station controller (BSC) 111 services, and they form a base station system (BSS) 115.BSC111 is connected to a mobile switching centre (MSC) 120, and the latter is connected to a public switch telephone network (PSTN) 130 subsequently.Travelling carriage (one of them is shown MS100) is operated in the communication unit of BTS105-109 service, and by radio frequency (RF) signal 103 in known manner with BTS105-109 in one communicate.The calling of starting on MS100 or stopping is sent to a wireless telephone user that links with PSTN130 or arrives MSC120 or other mobile phone communication system user of other MSC (not shown) service by MSC120.
In a preferred embodiment, travelling carriage (MS) the 100 designated access grades of BSS115 service are so that management inserts BSS.In order to ask the service of BSS115, MS100 will send a signal 103 to all BTS105-109 that is commonly referred to paging.In a preferred embodiment, this paging signal is called as one and inserts pulse (RAB) at random, and it is one 8 (byte) information of all the BTS105-109 request services in the BSS115 scope that sent to by MS100.That Special Significance is arranged in the RAB scope is urgent word (EW), and for making effectively, it will differentiate that this service request is a urgent call.
With reference to figure 5, demonstrate an example of 8 bit RAB500 structures, it differentiates 3 bit EW502 in the RAB500.EW502 may make effectively with a kind of in three kinds of modes: MS100 has the grade of urgent access; MS100 has normal access grade, but is just attempting to carry out a urgent call (promptly 911); MS100 has the special service access grade and is just attempting to carry out a urgent call, such as 911.So though BSS115 and do not know the special identity of MS100, the EW502 in being included in RAB500 is made when effective, it knows that this service request is an emergency.In a preferred embodiment, as above differentiate when EW502 by effectively the time, it will be set to logic state " 1 ", on the contrary when being under an embargo, it will be set to logic state " 0 ".
With reference to figure 2, demonstrate the flow chart of the embodiment of existing technology.It illustrates the call treatment sequence of normal access service request.Under the condition of normal call, when the MS100 request inserts on BSS115, it will send the signal 103 of a request normal service (being that EW is under an embargo), shown in step 200, in step 202, BSS115 will distribute an available control channel to give MS100 responding this service request at random, and signal MS100:BSS115 and accepted its service request 206.Can not handle the audio frequency calling and can only be used for the signaling purpose because of a control channel.So in step 208, when MS100 resides in control channel temporarily, BSS115 will signal MSC120:BSS115 an incoming call from MS100, thereby in step 210, MSC120 can determine whether to ask the audio frequency service, and is different with control channel, communication channel can be handled audio frequency and call out and signaling information, in step 212, if MSC120 determines not need communication channel, then control channel will be handled this calling 220.On the other hand, when determining to need communication channel, then MSC120 will notify BSS115 in step 214: ask a communication channel in step 212.In step 216, BSS115 will determine to distribute which communication channel and by control channel notice MS100 be tuned to a characteristic frequency to insert this communication channel 218, discharge control channel subsequently.
In the scope of the preferred embodiment of gsm communication system, after this control channel will be called as an independent special-purpose control channel (SDCCH), and communication channel will be called as a Traffic Channel (TCH).
With reference to figure 3, demonstrate the representative instance of the block diagram of a mobile phone communication system, it embodies the characteristics according to preferential access service of the present invention.In this embodiment, a signal 103 that comprises RAB500 is sent to BTS105-109 antenna 302 from MS100.The signal 103 that has received is connected to channel equalizer/detector 306 through amplifier 304, the existence of RAB500 in its detection signal 103.Communication channel determines/distributor 310 determines then whether RAB500 makes effective EW502 in input signal 103, if having, it will distribute MS100 to available TCH.If the TCH that the BTS105-109 neither one can be used, then communication channel determine/distributor 310 determines whether SDCCH are available, in this way, then it is distributed to MS100 and removes a TCH simultaneously and use to MS100.If communication channel determines/distributor 310 determines that SDCCH can not use, it will be adjusted a mark 600 emergency call request of expecting in the following call request will be described.In case can use TCH, then TCH 308,312,330,320,318,316 and 314 work in known manner.Communication channel determines/distributor 310 only is to be used for determining whether TCH can use, and in this way, then it distributed to MS and constantly follows the tracks of the number of the emergency service request that receives by BSS with the form of mark 600.
Fig. 4 provides the flow chart of an example, and its explanation is according to an embodiment of preferential access service of the present invention.In step 400, BSS115 will receive a signal that contains RAB500 103 from MS100.In sequence is started in a urgent call, in step 402, BSS115 will determine that the EW502 of the RAB500 that MS100 sends will be made effectively, after adjusting mark 404, this request will be handled by any available TCH408-412 immediately, the latter will signal MS100:BSS115 and accept its request, thereby provide override to insert to this flash request.Therefore, the present invention carries out one of prior art is improved is exactly: have the RAB500 that makes effective EW502 when representing an emergency service request when BSS115 receives, this request will be immediately handled by any available TCH rather than SDCCH handles, thereby makes and finish the originating call required time and become minimum.
In step 408, if the TCH that the BSS115 neither one can be used, it will distribute an available SDCCH414-418, signal MS100, BSS115 has accepted its request (as the service request that coexists normally at random) and has begun the TCH that " dismounting " has non-emergency call 420." dismounting " process closure the communication path between MS100 and BSS115, thereby discharged a communication channel.In a preferred embodiment, new available TCH will be used to reside in the MS100 on the SDCCH422-424 temporarily.So, another improvement to prior art is exactly when not having TCH to use except a SDCCH, BSS115 will place MS100 provisionally, and (it will signal MS100 on SDCCH, request is accepted, thereby prevented time-out/send out again RAB problem) and begin " dismountings " of calling out than low priority, become minimum thereby make to providing the MS100 request to serve used time.
In step 416, when BSS115 does not distribute SDCCH or TCH to give a urgent call, MS100 will can not receive any response to its initial RAB500.MS100 will suspend the BSS115 that wait will respond, and will send other RAB500 in step 416.So BSS115 can receive a plurality of RAB500 from same MS100.Like this, when highly utilizing a unit, in making great efforts the process of TCH of release to the urgent RAB500 of a repeating transmission, several non-emergency call can be terminated.
Because several probably MS100 will strive identical urgent call, BSS115 will follow the tracks of a mark in step 426, and this will provide the mark of an emergence call service degree.When mark reaches a thresholding 426, the access that BSS115 will at first limit normal access grade 432 is beneficial to preferential access grade.So to another improvement of technology is those channels of some MS100 with preferential access grade of the needs that communication channel increased by expection and maintenance, the present invention allows BSS115 that an emergency is worked.
At last, with reference to mark relevant in step 426, Fig. 6 descriptive markup is measured an example of 600.BSS can be used for following the tracks of and is placed in a urgent call load in the system.Particularly, Fig. 6 represents a mark 600, and it is defined as relevant with a ratio, and this ratio is the number 602 of emergency service request in given time and the ratio of the number 604 of spendable communication channel in a given BSS.
Put it briefly, the present invention who is stated has here done two significant improvement to prior art.At first, when communication system received a paging that has an emergency service information, any available communication channel was directly handled this request immediately, rather than the normal BSS-MSC communication process that shows of prior art.The second, communication system will be followed the tracks of a mark, and its representative is placed in the emergence call service in the system, and in case of emergency, outdoor except those usefulness with preferential access service grade, it will at first refuse to insert this communication system to all users.Under urgent situation, these two improvement as one man provide a greatly sensitive and effective communication system.

Claims (10)

1. the method for an allocation of communication channels in communication system, the method includes the steps of:
Reception is from first user's the signal that contains an emergency service information;
Determine whether to exist a spendable communication channel; And
Give first user according to the spendable communication channel of the state assignment of emergency service information.
2. according to the method for claim 1, also comprise following steps:
When not having available communication channel, determine whether to exist an available control channel; And
When definite control channel can use, distribute this available control channel to give first user.
3. from a communication channel, remove second user who does not have urgent access grade according to the process of claim 1 wherein that the step that determines whether to exist an available communication channel also comprises, so that produce the step of an available communication letter.
4. the equipment of an allocation of communication channels in a communication system, this equipment comprises:
Receive the device that contains the emergency service information signal from first user;
Determine whether to exist the device of an available communication channel; And
Distribute available communication channel to give first user's device.
5. according to the equipment of claim 4, also comprise:
When not having available communication channel, determine whether to exist the device of an available control channel; And
When definite control channel can use, distribute available control channel to give first user's device.
6. according to the equipment of claim 4, wherein determine whether to exist the device of available communication channel also to comprise and remove second user who does not have urgent access grade so that produce the device of an available communication channel from a communication channel.
7. equipment that in the base station system, distributes Traffic Channel to a travelling carriage, this equipment comprises:
Receive a device that inserts signal from having the travelling carriage that makes effectively urgent word;
Determine whether to exist the device of an available Traffic Channel; And
Distribute available Traffic Channel to give travelling carriage, and at first do not distribute the device of control channel.
8. according to the equipment of claim 7, also be included in Traffic Channel and be determined in the time of to use, a device that distributes control channel to give travelling carriage.
9. one kind provides the method for a plurality of communication channels to corresponding a plurality of users in communication system, and the method includes the steps of:
Reception is from a plurality of signals of corresponding a plurality of users;
Follow the tracks of one with the relevant mark of the signal number with preferential access information that receives; And
When mark reached certain thresholding, the restriction access communication system had the user of preferential access information to those.
10. according to the method for claim 9, wherein mark is a ratio, it be the signal sum that receives with preferential access information with communication system in the ratio of sum of communication channel.
CNB961913045A 1995-11-01 1996-08-20 Method and apparatus for allocating a communication channel in a communication system Expired - Lifetime CN1145371C (en)

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US55159095A 1995-11-01 1995-11-01
US08/551,590 1995-11-01

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JP (1) JP3818668B2 (en)
KR (1) KR100267050B1 (en)
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CN1145371C (en) 2004-04-07
JPH10512432A (en) 1998-11-24
EP0801871A1 (en) 1997-10-22
EP0801871A4 (en) 1999-08-18
KR100267050B1 (en) 2000-09-15
WO1997016931A1 (en) 1997-05-09
CA2205067A1 (en) 1997-05-09
JP3818668B2 (en) 2006-09-06

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