CN1085704A - Communication control method and apparatus for wireless telephone system - Google Patents
Communication control method and apparatus for wireless telephone system Download PDFInfo
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Abstract
一种无线电话系统，其中各蜂房的控制信道可以构成使其广播关于其蜂房的绝对信息和关于其它蜂房(包括该蜂房特性)的相对信息。此外还可以把其它控制信道的位置也包括在用以在某一特定蜂房的控制信道上广播的信息中。然后，利用该信息将流动电话装置锁定到最佳蜂房上。
A wireless telephone system in which the control channel of each cell can be configured to broadcast absolute information about its cell and relative information about other cells (including the cell's characteristics). In addition, the location of other control channels can be included in the information broadcast on the control channel of a particular cell. This information is then used to lock the mobile telephone unit to the best cell.
Description
The present invention relates to the control technology of mobile phone communication system, particularly the control technology of wireless communication system.
Telecommunications industry constantly develops, and the emphasis of its development is placed on the capacity of cellular system more and more.The present spendable frequency spectrum of duolateral communication is limited, so the universal demand cellular system improves network capacity, improves the ability that adapts to various different situations message volumes.Though the popularization of digital cellular system has improved system's latent capacity really, depend merely on these raisings and may be not sufficient to satisfied further requirement capacity and radio coverage.In order to satisfy ever-increasing requirement, may also need other measure to increase the capacity of system, for example enlarge the scale of city district honeycomb.
Honeycomb close to each other on layout, the communication between them each other can the phase mutual interference, and this has produced the other problem, and is when especially adopting more small-sized honeycomb, all the more so.Therefore need to propose with the technology of the interference reduction between each honeycomb to minimum degree.Known a kind of technology be with each honeycomb be grouped into some " bunch ".In each bunch, communication frequency is distributed to each specific honeycomb by certain mode, thereby enlarge the distance of using the unanimity that has between each honeycomb of same communication frequency in variant bunch to greatest extent.This distance can be referred to as " frequency reuse " (freguency reuse) distance.Along with the expansion of this distance, use the honeycomb of a certain communication frequency and honeycomb interference between the two that this same frequency is used in a distant place just to reduce.
For making radio coverage spread all over whole honeycomb district, Radio Basic Station often is placed in the center of each honeycomb.Not so also Radio Basic Station can be placed in three and adjoin near the center of " section honeycomb " (sector cells), so that these honeycomb are all covered.Selecting for use of sectionization and non-section system is that various consideration (for example cost of equipment of each base station) according to is economically determined.
As disposal method to the zone of mobile users comparatively dense, can set up local miniature honeycomb (microcell) and special miniature honeycomb (Picocell) in the macroscopical honeycomb (macrocell) that is covered, this mobile users compact district is called " focus " sometimes.In general, can establish miniature honeycomb, be covered with the main main line of communication that resembles highway and so on by a series of miniature honeycomb again for the main road that resembles crossroad or street and so on.Miniature honeycomb can also be distributed to edifice, airport and shopping center.Special miniature honeycomb and miniature honeycomb are similar, but cover a floor of office corridor or high building building usually." miniature honeycomb " speech is both to have referred to that miniature honeycomb also referred to special miniature honeycomb in this application scenario, and " macroscopical honeycomb " speech then is used to refer to the outermost layer of honeycomb structure." umbrella shape honeycomb " (umbrella cell) can be macroscopical honeycomb, also can be miniature honeycomb, as long as under the umbrella shape honeycomb honeycomb is arranged.Can near miniature honeycomb, establish other communication channel by actual needs, so both can increase total power system capacity, can keep low-level interference again.
The design of following cellular system may be included following each honeycomb: macroscopical honeycomb, indoor miniature honeycomb, outdoor miniature honeycomb, public miniature honeycomb and the miniature honeycomb that is limited to.On-the-spot common half warp that covers of macroscopical honeycomb umbrella shape surpasses one kilometer, and it is to provide service for quick mobile users (for example people by bus).The normally lower powered compact radio base station in miniature honeycomb scene, main management resembles pedestrian's and so on mobile users at a slow speed.Each miniature honeycomb scene can be regarded the expansion base station that is connected with macroscopical honeycomb scene by digital radio transmission or optical fiber as.
When designing miniature honeycomb, need to give each honeycomb to distribute certain spectral range.This has several practices, and for example, each miniature honeycomb can be used the frequency spectrum of the miniature honeycomb in a distant place again; The existing frequency spectrum of a part is special only to be used for miniature honeycomb; Perhaps miniature honeycomb can be used the frequency spectrum of the miniature honeycomb of umbrella shape.
In the special-purpose frequency spectrum of miniature honeycomb, a part of existing frequency spectrum strictly keeps to miniature honeycomb use.Use frequency spectrum and mean that the existing frequency of borrow macroscopic view honeycomb uses for miniature honeycomb.
These method for channel allocation cut both ways.With a distant place macroscopic view honeycomb capacity of macroscopical honeycomb structure is slightly reduced again.But because co-channel (adjective) mutual interference mutually between macroscopical honeycomb and the miniature honeycomb, thereby use always not practicable again.
Make frequency spectrum for miniature honeycomb special use, then taking place between each miniature honeycomb rather than between each macroscopical honeycomb owing to any co-channel interference, thereby the interference reduction between each honeycomb layer (miniature honeycomb and macroscopical honeycomb).When making frequency spectrum supply certain miniature honeycomb special-purpose, this frequency spectrum is that whole macroscopical cellular system in from certain zone (for example city) extracts.Like this, this frequency spectrum just can not use for macroscopical honeycomb.As a result in the zone of only containing a small amount of miniature honeycomb, because each miniature honeycomb only covers a fraction of zone in macroscopical honeycomb zone, and macroscopical honeycomb must cover a sheet of zone under the situation that existing frequency spectrum reduces, thereby capacity is had adverse influence.Yet along with the increase of miniature honeycomb quantity with only be the reducing of zone that macroscopical honeycomb covered, the capacity problem relevant with special-purpose frequency spectrum may reduce, and can need not to cause in macroscopical honeycomb and block and obtain total net gain on overall system capacity.
Use the channel of umbrella shape macroscopic view honeycomb, and use equally again, may make the co-channel interference of appearance between miniature honeycomb and the macroscopical honeycomb.In addition, owing to often can not distribute frequency spectrum effectively, capacity may be adversely affected.For example, use frequency spectrum or make frequency spectrum may be difficult to connect simultaneously each focus in the honeycomb when special-purpose for miniature honeycomb.The benefit of using frequency spectrum is can the special use of picture frequency spectrum not influence whole macroscopical cellular system like that, because the frequency spectrum of macroscopical honeycomb of just having distributed to the covering effect of being used, rather than the frequency spectrum of whole system.Like this, other each macroscopical honeycomb same frequency spectrum that can use miniature honeycomb using there from macroscopical honeycomb of covering effect.
In addition, in honeycomb bunch design, the frequency spectrum that is distributed must be distributed to each miniature honeycomb scene.Distribute the employed all perception methods of frequency spectrum that fixed Frequency Assignment is arranged, dynamic frequency allocation (DCA) and adaptive channel distribute (ACA).In addition, also need to select the control channel administrative skill.A kind of possible practice is to make each honeycomb or zone in the compartmentalization system use the unique control channel, up to see from the viewpoint of disturbing with frequency more feasible till.
The introducing of miniature honeycomb makes radio net planning complicated more.Planning process depends primarily on the structure of miniature honeycomb.For example, the size of shopping center, street and building all is the main criteria of design.Miniature honeycomb has a series of problems, comprises the growth of the sensitiveness that traffic carrying capacity is changed, the difficulty of interference between each miniature honeycomb and prediction traffic carrying capacity size.Promptly enable the fixing radio telephone communication system is successfully planned out, but, may need to plan again whole system for example owing to set up new base station with the change of needs of satisfying traffic carrying capacity and increasing and so on to system parameters.Owing to these reasons, all can adaptive system for channel allocation for traffic case and disturbed condition, it is beneficial to introduce miniature honeycomb.
The problem of a main care relevant with miniature honeycomb is to reduce Frequency Distribution in FDMA and the tdma system or the power division in the cdma system to greatest extent.It all is inconvenient will predicting the radio propagation relevant with environmental problem (for example rough degree of physical features and ground level) and disturb in miniature honeycomb environment, thereby the even possible words of the distribution of frequency or power also are exceedingly difficult.One of them solution is to adopt adaptive channel to distribute (ACA) scheme, so just need not the Frequency Distribution planning of fixing.When the practice according to the method distributes radio channel for a certain conversation, but any channel in each honeycomb scene using system.Channel is to distribute to each in real time by existing traffic case and existing disturbed condition to call out.But this type systematic may spend greatly, because in general more CU channel unit must be installed.
ACA has several benefits.Because each honeycomb can use any channel, thereby almost not loss on junction efficiency.Therefore, can use and possess the honeycomb of seldom measuring channel and unlikely any loss arranged on network efficiency.In addition, channel is again with being by the average interference situation but not worst case decision.
There are some ACA schemes all to attempt to improve volume of business, avoid Frequency Distribution.Though some system can reach these purposes to a certain extent effectively, but to all be (the system that promptly has certain characteristic frequency of preallocated system at each control channel, drift station can look to that under this characteristic frequency a control channel is arranged, and for example contains 30 kilo hertzs of radio-frequency channels of control signal) in reach above-mentioned two purposes simultaneously and have any problem.The preallocated system of control channel comprises AMPS (high level flow mobile phone operation system), IS-54 (revised edition B, that is: Revision B) and TACS (total access communication system, i.e. Total Access Communication System).Each control channel also needs Frequency Distribution in these systems.But can avoid the speech channel dividing frequency,, thereby improve volume of business simultaneously because need not can not be by a series of speech channel of each field program in the zone of uniform distribution in those Traffic Channels.
When the planning antenna system, bunch distribute frequency spectrum for miniature honeycomb and when selecting miniature honeycomb transmission power level, consider several aspects.Enough radio coverages (for example 98%) must satisfy in whole miniature honeycomb district.In addition, be from macroscopical honeycomb in distant place frequency spectrum of usefulness again if distribute to the frequency spectrum of miniature honeycomb bunch, then the power level of miniature honeycomb should be low be enough to prevent to disturb those to use distant place macroscopic view honeycomb under the frequency spectrum again.In addition, be limited in the miniature honeycomb if flow, the power of control channel may be bigger than the power that covers umbrella shape macroscopic view honeycomb control channel in the then miniature honeycomb.In a word, the purpose of this system is to distribute mobile telephone machine as much as possible to each control channel, method is to keep those control channels to make its control channel than umbrella shape macroscopic view honeycomb in the miniature honeycomb district of expecting stronger, simultaneously with low as to be enough to prevent to disturb the power of distant place macroscopic view honeycomb to transmit.
When being subjected to the restriction of power or interference, the speech channel of system will be restricted, and at this moment macroscopical honeycomb of covering from above of the mobile telephone chance in each miniature honeycomb is received stronger signal.Reception is from the number of the mobile telephone machine of the stronger signal of the macroscopical honeycomb that covers above, can increase along with umbrella shape honeycomb and reducing of miniature intercell distance.So because each mobile telephone machine all is locked on macroscopical honeycomb, capacity may not can increase.In addition, if the power request transmission that flows increases, for keeping the performance level of equivalence, then the battery life of existing pocket telephone may correspondingly increase.Have again, when high power mobile telephone machine is in the miniature honeycomb district, may causes and block and cross modulation.The power of high power mobile telephone machine is subjected to the control of umbrella shape macroscopic view honeycomb, and is big with the power ratio that umbrella shape macroscopic view honeycomb signal post the needs power demand of communicating by letter with miniature honeycomb.
By comprising various honeycomb in the channel management scheme of the invention process.For ease of with the locking of mobile telephone device or in fixing on only honeycomb, the control channel body plan of each honeycomb must be able to be made the information of its broadcasting about other honeycomb, comprise the characteristic (for example honeycomb type) of each honeycomb.Can be also included within other control channel frequency and temporal position in the information on the control channel that is broadcast to specific honeycomb in addition.The mobile telephone machine utilizes this information to lock onto comparatively ideal honeycomb then.Locking promptly is to select a certain honeycomb and make that mobile telephone is machine-readable to be gone out all message and prepare to receive each paging and calling.Like this, in a single day the mobile telephone machine locks onto certain specific honeycomb, just can call out and receipt of call.
The mobile telephone machine is attempted to seek according to the only professional machine of the needs of mobile telephone machine and system, promptly only honeycomb according to the control information of finding on control channel.For example, according to one embodiment of the present of invention, only professional machine is the professional machine that requirement mobile telephone machine transmits with the minimal power value.In another embodiment, its purpose may be the expense that reduces to call out a certain client to greatest extent, thereby just can choose the minimum honeycomb of service charge that the mobile telephone machine is asked for.Can have variously in order to the criterion of determining best honeycomb, all these class criterions all are considered as belonging to scope of the present invention.In general, best honeycomb is determined according to the every requirement and the purpose of system.
Referring now to the present invention only be provide by way of example, and most preferred embodiments more illustrated in the accompanying drawings, illustrate in greater detail content of the present invention.In the accompanying drawing:
Fig. 1 is the honeycomb plane graph, shows two honeycomb bunch in the duolateral mobile radio telephone system;
Fig. 2 shows the typical multilayer cellular system that adopts umbrella shape macroscopic view honeycomb, miniature honeycomb and special miniature honeycomb;
Fig. 3 shows the typical control channel;
Fig. 4 is an embodiment of radio telephone system equipment of the present invention.
Though what following explanation was said is to comprise duolateral communication system portable or mobile radio words and/or personal communication network (PCN), those skilled in the art that know that the present invention also is applicable to other communication system.
Fig. 1 shows first honeycomb bunch A and second honeycomb bunch B, and two bunches of honeycomb form the part of duolateral mobile radio telephone system in known manner.People such as Ghisler are entitled as in the United States Patent (USP) 5,230,082 of " method and apparatus that improves the degree of reliability of delivering a letter in the duolateral mobile radio telephone system " and have introduced this system, here the disclosure of this patent are included for your guidance.In general, existing all frequencies in the using system in each honeycomb bunch.In each honeycomb bunch, each frequency is all distributed to different honeycomb, so that make each honeycomb that uses public frequency in different honeycomb bunch, distance therebetween reaches maximum unanimity distance and (is called: frequency reuse distances).Among Fig. 1, the shared frequency of honeycomb A1 and B1, the shared frequency of honeycomb A2 and B2, shared frequency of honeycomb A3 and B3 or the like.Adopt the radio channel of same frequency among honeycomb A1 and the B1, share same frequency, so be called co-channel.Though can produce disturb between co-channel, this interference is the acceptable normally of the degree in the layout resembling Fig. 1.Its Frequency Distribution of honeycomb plane graph of Fig. 1 is fairly simple, and the co-channel interference under the low traffic situation reduces to some extent.Yet, as above spoke face to face like that, the limitations restrict in heavy traffic district the application of this honeycomb plane graph.For example, the traffic carrying capacity in each focus can cause obstruction.
Following system may not need the sort of Frequency Distribution relevant with the honeycomb structure of Fig. 1.For example, CDMA (code division multiple access connects, that is: Code division multiple access) system may have extremely different distribution methods, but need not to carry out Frequency Distribution.But may need to consider the power division of transmitter on the contrary.Have, in cdma system, each channel may need not to use like that according to Fig. 1 is described again again.The United States Patent (USP) 5,151,919 and 5,218,619 that is entitled as " CDMA subtracts each other demodulation " has all been introduced cdma system, here the content of this patent is included for your guidance.In non-cdma system, can adopt the technology that resembles ACA and so on, thereby not need strictness to carry out Frequency Distribution, particularly preassignment, be i.e. the distribution of under the situation of the transient state of not knowing to comprise distribution of traffic and interference profile, carrying out.
Fig. 2 is an example of multilayer cellular system.Umbrella shape macroscopic view honeycomb 10 formation of representing with hexagon cover top cellular structure.Each umbrella shape honeycomb may contain a miniature honeycomb structure in basis.Umbrella shape honeycomb 10 comprises with the miniature honeycomb 20 that is enclosed in the region representation in the dotted box with being enclosed in the interior region representation of dot-dash wire frame corresponding to miniature honeycomb 30 and the miniature honeycomb 40,50 and 60 that is covered with each floor of building along avenue.Two avenues are that miniature honeycomb 30 and 40 cross sections that covered may be the traffic carrying capacity compact districts, thereby can be expressed as focus.
Briefly, set up calling, notify each base station, and notify each drift station about position and the parameter relevant with each base station about position and the parameter relevant with each drift station with each control channel.Each miniature honeycomb base station is monitored the calling connection requirement that each drift station proposes, and each drift station is monitored each beep-page message again.Connect in case receive to call out, will determine which honeycomb to be responsible for handling this calling by.
Following system can adopt some other honeycomb.For example, new system can comprise any combination of macroscopical honeycomb, indoor miniature honeycomb, outdoor miniature honeycomb, public miniature honeycomb and restricted or the miniature honeycomb of private.Therefore new system may design to such an extent that contain the control channel that quantity is increasing.At present, in the General System that the U.S. adopts, a honeycomb bunch spendable control channel has 21 approximately.
According to the present invention, each control channel in each honeycomb be body plan must make its broadcasting about other honeycomb (if any) information of the information that whether exists and the characteristic in these rooms, peak (comprising minimum quality standard, power requirement etc.).In general, the information that whether exists about other honeycomb is broadcasted around each contiguous honeycomb.For example, be close to honeycomb may be adjoin with honeycomb in broadcasting, overlapping or non-adjacent.Each control channel in the area of coverage at mobile telephone machine its place of periodic scanning during idle condition is to determine should lock onto on which honeycomb.Therefore, the mobile telephone machine can according to its existing position and the quality standard (for example signal strength signal intensity received) relevant with each honeycomb constantly selection should lock onto honeycomb on it.The honeycomb that the mobile telephone machine can be locked is the honeycomb that the mobile telephone function satisfies the quality standard relevant with honeycomb therein.For example, the mobile telephone machine may preferentially use the honeycomb of the basic unit that considers based on capacity.
According to the present invention, the information of being broadcasted on control channel has two kinds: " absolute information " and " relative information ".Absolute information comprise about with the information of the corresponding specific honeycomb of control channel that is carrying out information broadcast.This information may comprise the scope of business of this honeycomb, the tissue of control channel and/or the type (for example restricted type or unrestricted type) of honeycomb.Non-limiting honeycomb is the spendable at any time honeycomb of all users, and restricted honeycomb is then opposite.Relatively information normally with the congener information of absolute information, but be information about other each honeycomb characteristic.
The mobile telephone machine should often be locked in a certain best honeycomb, and this point is very important.Specifically, whenever all have people's paging flow mobile phone machine, so the mobile telephone machine must be locked on the specific honeycomb of region, make the mobile telephone function receive this paging.For example, if the mobile telephone machine location from first honeycomb of its locking moves to another honeycomb in the different regions, then can not listen to or receive the paging requirement that this mobile telephone machine is proposed, because be in the region of its registration, to carry out on the existing paging channel when flowing switching center (or MCS) this mobile telephone machine of paging.Therefore, if the mobile telephone machine is not registered in the zone at this, be can not receive the paging requirement, so should be when the mobile telephone machine enters a new location to new base station registration.As the region, generally include large numbers of honeycomb that adjoin.As instructing all this mobile telephone machines of paging of all locations, then efficient was both poor, and was impracticable again.
The mobile telephone machine can be to the base station registration of a certain region.The location is the honeycomb of one group of adjacency normally, and the area of radio coverage of these honeycomb is not necessarily identical.For example, with regard to Fig. 2, miniature honeycomb 20,30,40,50 and 60 can be said to be a location.
One comprise public umbrella shape honeycomb, public miniature honeycomb and the miniature honeycomb of private (promptly one whenever can with the joining miniature honeycomb of the closed user group that resembles local base station or campus system and so on) instance system in, all these honeycomb all can be the mobile telephone machine and provide and be enough to connect or the radio coverage of paging receiving.The mobile telephone machine can according to two kinds of information (that is: obtain on (1) umbrella shape honeycomb control channel, contain comprise about on the information of each basic unit's honeycomb information and (2) each miniature honeycomb control channel about the information of any covering honeycomb) lock onto on the suitable honeycomb.In a word, about have or not above other cover or basic unit's honeycomb structure, about the characteristic of these honeycomb structures with where can find the information of content such as these structures, can on each control channel, be broadcast to each mobile telephone machine.
When selecting suitable honeycomb, the mobile telephone machine is lockable on a certain candidate control channel, and finds out the absolute information of all honeycomb relevant with this control channel, to determine whether this honeycomb is suitable.Not so the mobile telephone machine also can be by the message that occurs near any honeycomb reading and the control channel thereof so that find out the same information that the form with relative information occurs.
If a certain mobile telephone machine is determined: there is more than one honeycomb to satisfy minimum requirements (for example signal link quality, connection restriction, the scope of business etc.), then this mobile telephone machine just can scan the subclass of all control channels or this control channel, makes the best then and chooses.For example, the mobile telephone machine can be selected to be locked in and need not the private honeycomb that uses the honeycomb of equalizer or resemble local base station and so on.In general, little honeycomb does not need equalizer.Whether need equalizer to depend on the situation of radio propagation and bit rate.
Table 1 listed honeycomb some can include characteristic in the information on the specific control channel in.A honeycomb has more than one control channel, and in this case, the relative information on several control channels of honeycomb is generally all identical.Some or can on other control channel on each honeycomb of " close " related control channel, transmit all about the information of control channel.In general, " close " comprises honeycomb adjacency, that area of radio coverage is identical.For example, with regard to Fig. 2, the control channel of miniature honeycomb 30 can be broadcasted the information about honeycomb 10,20,40,50 and 60.
Table 1
| Information | The source |
| Where can find control channel and to the decoding of this control channel; | ????Z |
| For example, frequency, time slot mark symbol, S-CDMA sign indicating number, CDMA pilot the sign indicating number, frequency hop sequence | |
| Only be urgent call | ????Y |
| The maximum transmission power of drift station | ????Y |
| The minimum transmission power of drift station | ????Y |
| Need/do not need equalizer (can economize on electricity) | ????Y |
| " urban telephone system " may can be different with the backbone system at aspects such as power, business, charges | ????Y |
| The operation test call; Can maybe can not receive urgent call; Can connect special flow mobile phone machine | ????Y |
| Absolute location | ????Y |
| Relative location (with respect to this honeycomb) | ????Z |
| Campus system (closed user group); The identifier of full name or abbreviation can send at other honeycomb | ????Y |
| Local base station | ????Y |
| Honeycomb (for example, on bus, train) flows | ????Y |
| The rescue honeycomb is for rebuilding in case of necessity or seeking new honeycomb fast, so that lock onto on it | ????Z |
| The scope of business (for example, only providing data, speech etc.) | ????Y |
| The rules revision is disturbed in broadcasting | ????Y |
| The owner of system (identifier full name) | ????Y |
| The owner of system (with respect to this honeycomb) | ????Z |
| Time synchronized control channel (time slot adjustment, distribution code adjustment, super or superfine framing control); A honeycomb (or on-the-spot) can be adorned more than one control channel | ????Z |
| The honeycomb that bans use of-can not set up conversation | ????Y |
| Appear at this area of radio coverage without the honeycomb type that identifies (for example public/private) | ????Y |
| Where the control channel system for example, can find different paging channel, packet switched data etc. | ????Y |
| Parameter/standard when selecting for use (for example guaranteeing that wireless link has enough quality) with the gravity treatment honeycomb | ????Y |
In table 1, that first hurdle is represented to broadcast on control channel, about the type of the information of honeycomb and control channel." Y " in second hurdle expression: if this information about certain mobile telephone machine be tuned to this control channel, then come in handy; If this information then also comes in handy about other honeycomb and control corresponding channel thereof, absolute and relative information." Z " in second hurdle is if expression information about other honeycomb, relative information, then comes in handy.
Control channel can be got the form that " general part " (overhead part) and " other parts " forms, as shown in Figure 3.General part can comprise general information about system, and for example the mobile telephone machine connects the parameter that need read before.General part can also comprise determines that certain particular flow platform can find the information of its paging channel wherein." other parts " can comprise the channel of paging channel and other type.The example of control channel system can be referring to people's such as Umeda the United States Patent (USP) 5,081,704 that is entitled as " method of arranging radio control channel in the mobile communication ".For example, control channel system information can comprise information like this: where can find general information in certain specific control channel message, where can find paging channel.
According to one embodiment of the present of invention, the positional information of other control channel can be represented that the control corresponding channel is in the mark of time synchronized state by affix, assists to choose the usefulness of honeycomb when being in idle condition for the mobile telephone machine again.Synchronizing information can comprise time difference information.Time difference information can be some kinds of forms.This control channel can comprise the actual time difference between the control channel of this control channel and another candidate honeycomb.But from practicality, time difference information can comprise whether the expression time difference is zero single binary piece of information.
If two control channels are through adjusting on for example time slot, frame, superframe (a collection of tdma frame) or special superframe (a collection of superframe), should the time difference be known perhaps to this mobile telephone machine, suppose that then this control channel includes about where finding control channel and to its information of being decoded, this mobile telephone machine just can lock onto rapidly on the candidate control channel (honeycomb).The present invention is not limited to tdma system, and it can be applied to other system, comprises cdma system.Even come from the former of capacity thereby have only a limited number of relative information to broadcast on control channel, time difference information has also worked to quicken to choose and choose the process of honeycomb, thereby improves the characteristic of system.For example, drift station may can not detect paging signal within a short period of time.So just reduced " idle time " relevant with paging receiving when searching for (dead time).
Direct sequence (DS) CDMA sign indicating number and the CDMA sign indicating number (a pilot codes) of piloting can be used as relative information and is included.DS CDMA sign indicating number is the PN sequence code, for the usefulness of communicating by letter with particular base station.The sign indicating number of piloting is short code, in order to synchronization with provide about how seeking the information of PN sequence (being suitable phase relation and the starting time).
Some item of information that can be located on the control channel is similar each other.For example, drift station power is maximum for the power of low and flow transmitters.
Honeycomb select and again choice criteria can comprise path loss canonical parameter, this is that received signal intensity connects the difference between the threshold signal level with minimum.The GSM technical specification has been discussed this class standard, but GSM does not select honeycomb and again choice criteria be used as relative information.In general, if path loss canonical parameter is positive, then the covering quality of honeycomb is acceptable.Second parameter can be used in combination with path loss standard.Second parameter determines to select the priority of suitable honeycomb again, and it is combined by path loss standard and network controlled parameter and draws.The honeycomb selection course (example of honeycomb architecture is: miniature honeycomb and macroscopical honeycomb structure) of each network parameter control honeycomb architecture (hierarchical cell struture), among this structure, network operation personnel's intention is distributed to each mobile telephone machine in a honeycomb honeycomb in addition of the signal source of the peak signal of receiving as the mobile telephone machine.
The above-mentioned standard of choosing and choose honeycomb may require to be determined at the signal strength signal intensity of receiving on the corresponding control channel with the absolute or relative parameter that sends on each control channel.The mobile telephone machine can be selected only honeycomb by each parameter that contrasts this group measurement result and different control channels.In addition, the scope of business of candidate honeycomb can also be determined the selection of each control channel (honeycomb).Scope of business information can comprise that resembling employed is the information of the type (being data, speech and data and speech) and so on of speech coder, data bit transfer rates and the manageable data of honeycomb of half rate or full rate.
For measuring the signal strength signal intensity of the specific honeycomb of being received, the mobile telephone machine must enter into the control channel of this specific honeycomb, so that measure the signal strength signal intensity of being received.Like this, the signal strength signal intensity of being received is an absolute reference, can not relatively be measured.Therefore, if the signal strength signal intensity of being received is a major parameter, then the mobile telephone machine should be checked the signal strength signal intensity of being received on the candidate control channel at last before locking onto a certain control channel.Information can be used to differentiate the possible suitable control channel of listing in control channel and the minimizing table relatively.Like this, the mobile telephone machine that has the relative information of some type is just determined one group of candidate honeycomb that satisfies specific criteria.Then, the mobile telephone machine connects at least one candidate control channel to find out an acceptable control channel of its signal strength signal intensity.Some requires relevant parameter to can be used as relative information transmission with signal link, but may need the absolute information of some form.
The several Control channel is often corresponding with a honeycomb.But a honeycomb can have more than one control channel, thereby control channel is not necessarily cancelled honeycomb during because of improper being cancelled as the candidate honeycomb.
The location is that another can be by the parameter of broadcasting on the control channel.The location is that formulate the position at place when being used for paging for definite mobile telephone machine.Will be when in general, the mobile telephone machine changes its location to new base station registration.
Can be equipped with on the control channel with various honeycomb type informations and lock onto only honeycomb to assist the mobile telephone machine.For example, some honeycomb can use under some special situations, for example: the honeycomb of using for urgent call only; By flow model mechanism with the represented mobile honeycomb of aircraft or bus and so on; May need it is tested (for example because they are joined in the system) because of operating personnel thus only limit the use of in the test honeycomb of special flow mobile phone machine; Distribute and be connected to Closed User Group (for example member's of particular home) local base station; The emergent honeycomb that may be for example uses for will rebulid honeycomb of conversation emergency the time when the mobile telephone machine; Stopping using because of for example critical honeycomb maintenance can not be in order to the forbidding honeycomb of conversation; And other public and honeycomb type private.The form of the desirable cellular system information of honeycomb type information.The example of this class cellular system has: only limits the use of in the campus system of certain zone and certain customer group, and the urban telephone system that the requirement on business, expense and power may be different.
The major issue that should consider during broadcast message on control channel is: the limitation of system aspect the amount of information that can be transmitted in message on the control channel, the i.e. limitation of control channel transmission capacity aspect.Therefore be not suitable for also not needing to broadcast all relevant information usually.So must trade off by one in work between the two in needed relative information and control channel capacity.Under an opposite extreme situations, do not send any relative information, and the mobile telephone machine must be locked in all candidate control channels, initial honeycomb is selected and honeycomb is selected for information about again so that find to be used for.Under another extreme case, the mobile telephone machine may be tuned on certain single control channel and receive all and determine best honeycomb and the information that needs.In the case, the mobile telephone machine will be all about near the information of each honeycomb in addition relatively and choose the room, peak an of the best.
According to the present invention, base station can be equipped to such an extent that make it can manage several speech channels and common at least one control channel.But it is contemplated that honeycomb may not have control channel, and only supply the usefulness of transmission.Therefore, calling is not to derive from a honeycomb that does not have control channel.Fig. 4 is the block diagram of the duolateral mobile radio telephone system of one embodiment of the invention.From system, can see typical base station 110 and mobile telephone machine 120.Base station has a controlled processing unit 130 to be connected with MSC140, and MSC140 is connected with the public phone exchanges network (not shown) again.The ordinary circumstance of this class duolateral radio telephone system is a known technology.Exemplary systems can be entitled as the United States Patent (USP) 5,175,867 of " transmittance process that the neighbours in the duolateral communication system assist formula " referring to people such as Wejke, here this patent is included for your guidance.
The base station 110 of honeycomb has a plurality of speech channels by speech channel transmitter-receiver 150 control, and 150 of transmitter-receivers are by controlled processing unit 130 controls.In addition, each base station also has a control channel transmitter-receiver 160, and transmitter-receiver 160 may can be controlled more than one control channel.Control channel transmitter-receiver 160 is by controlled processing unit 130 controls.Control channel transmitter-receiver 160 is broadcast to the mobile telephone machine that is locked on this control channel with the control channel of control information by base station or honeycomb.
When mobile telephone machine 120 was in idle condition, its periodic scanning resembled 110 base station to determine should lock or stay calmly to which honeycomb.Mobile telephone machine 120 receives absolute and relative information broadcast on the control channel of its speech channel and control channel transmitter-receiver 170.Then, the information that comprises candidate honeycomb characteristic that 180 pairs of processing units are received is estimated, and which honeycomb definite mobile telephone machine should lock onto on.The control channel information of being received not only comprises the absolute information about the honeycomb relevant with it, but also comprises the relative information about near other honeycomb the honeycomb relevant with control channel.The information type that can appear on the control channel is shown in the aforesaid table 1.
Existing mobile telephone device can limit the flexibility of design control channel scheme.For example, the actual power capacity of mobile telephone device is subjected to the size of mobile telephone device and the restriction of energy characteristics at present.Can expect that the present invention can become the pith of the mobile telephone device of the many aspects of following the present invention easy to implement.
Those skilled in the art that introduce and illustrate with regard to specific embodiments more of the present invention so far, but it should be understood that the present invention is not limited to these embodiment, because can carry out various modifications to it.The application has taken into account any belonging to all to the modification in the disclosed and claimed here basic the spirit and scope of the present invention.
Claims (18)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94546892A | 1992-09-16 | 1992-09-16 | |
| US945,468 | 1992-09-16 | ||
| US955,591 | 1992-10-02 | ||
| US07/955,591 US5353332A (en) | 1992-09-16 | 1992-10-02 | Method and apparatus for communication control in a radiotelephone system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085704A true CN1085704A (en) | 1994-04-20 |
| CN1051901C CN1051901C (en) | 2000-04-26 |
Family
ID=27130224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93117806A Ceased CN1051901C (en) | 1992-09-16 | 1993-09-15 | Method and apparatus for communication control in a radiotelephone system |
Country Status (10)
| Country | Link |
|---|---|
| CN (1) | CN1051901C (en) |
| AU (1) | AU668591B2 (en) |
| CA (1) | CA2123605C (en) |
| GB (1) | GB2275589B (en) |
| HK (1) | HK1006623A1 (en) |
| MX (1) | MX9305503A (en) |
| MY (1) | MY109870A (en) |
| NZ (1) | NZ256326A (en) |
| SE (1) | SE517898C2 (en) |
| WO (1) | WO1994007322A1 (en) |
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| US5603081A (en) * | 1993-11-01 | 1997-02-11 | Telefonaktiebolaget Lm Ericsson | Method for communicating in a wireless communication system |
| GB2303998B (en) * | 1995-08-03 | 2000-03-01 | Nokia Mobile Phones Ltd | Radio telephones and methods of operation |
| GB2320991A (en) * | 1996-12-20 | 1998-07-08 | Dsc Telecom Lp | Channel selection control in a cellular radio communications system |
| US5987322A (en) * | 1997-04-03 | 1999-11-16 | Ericsson Inc. | System specified adaptive mobile station behavior within a mobile telecommunications system |
| FI107982B (en) * | 1997-05-06 | 2001-10-31 | Nokia Mobile Phones Ltd | Cell selection due to use profile in a cellular radio system |
| FI105639B (en) * | 1997-06-25 | 2000-09-15 | Nokia Mobile Phones Ltd | An improved method for cell switching |
| EP1619870B1 (en) | 1997-07-22 | 2012-10-10 | Telefónica Germany GmbH & Co. OHG | Method and mobile network for call billing |
| GB2330484A (en) * | 1997-10-15 | 1999-04-21 | Motorola As | Mobile initiated handover during periods of communication inactivity |
| US6212405B1 (en) | 1998-08-31 | 2001-04-03 | Lucent Technologies Inc. | Extended range concentric cell base station |
| JP3196747B2 (en) * | 1998-12-18 | 2001-08-06 | 三菱マテリアル株式会社 | Mobile radio, base station radio, and recording medium thereof |
| WO2008152130A1 (en) * | 2007-06-15 | 2008-12-18 | Nokia Siemens Networks Oy | Apparatus, method and computer program product providing control of system information decoding |
| EP2345286A1 (en) * | 2008-10-31 | 2011-07-20 | Nokia Siemens Networks OY | Cell selection techniques for idle mode for wireless networks |
| EP2747490A1 (en) * | 2012-12-19 | 2014-06-25 | Koninklijke KPN N.V. | Session termination in an energy-efficient cellular wireless telecommunications system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3200965A1 (en) * | 1982-01-14 | 1983-07-21 | Siemens AG, 1000 Berlin und 8000 München | NEARBY RADIO CELL ORGANIZATION CHANNEL REFERENCE SYSTEM |
| DE3611301C2 (en) * | 1986-04-04 | 1997-09-25 | Philips Patentverwaltung | Mobile radio system with communication channel and organization channel |
| GB2195513B (en) * | 1986-09-18 | 1990-12-19 | Philips Electronic Associated | Radio system |
| US5093926A (en) * | 1989-09-29 | 1992-03-03 | Motorola, Inc. | Trunked communication system scanning method and apparatus |
| US5239667A (en) * | 1990-01-31 | 1993-08-24 | Nec Corporation | Method of controlling handoff in cellular mobile radio communications system |
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1993
- 1993-09-08 MX MX9305503A patent/MX9305503A/en unknown
- 1993-09-15 CN CN93117806A patent/CN1051901C/en not_active Ceased
- 1993-09-16 CA CA002123605A patent/CA2123605C/en not_active Expired - Lifetime
- 1993-09-16 NZ NZ256326A patent/NZ256326A/en not_active IP Right Cessation
- 1993-09-16 MY MYPI93001878A patent/MY109870A/en unknown
- 1993-09-16 AU AU49267/93A patent/AU668591B2/en not_active Expired
- 1993-09-16 WO PCT/US1993/008780 patent/WO1994007322A1/en active Application Filing
- 1993-09-16 GB GB9409631A patent/GB2275589B/en not_active Expired - Lifetime
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1994
- 1994-05-11 SE SE9401644A patent/SE517898C2/en not_active IP Right Cessation
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1998
- 1998-06-17 HK HK98105574A patent/HK1006623A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2275589B (en) | 1996-08-28 |
| AU668591B2 (en) | 1996-05-09 |
| GB2275589A (en) | 1994-08-31 |
| HK1006623A1 (en) | 1999-03-05 |
| CA2123605A1 (en) | 1994-03-31 |
| CA2123605C (en) | 2003-11-25 |
| SE517898C2 (en) | 2002-07-30 |
| AU4926793A (en) | 1994-04-12 |
| MY109870A (en) | 1997-09-30 |
| CN1051901C (en) | 2000-04-26 |
| GB9409631D0 (en) | 1994-07-06 |
| WO1994007322A1 (en) | 1994-03-31 |
| MX9305503A (en) | 1994-05-31 |
| NZ256326A (en) | 1996-05-28 |
| SE9401644L (en) | 1994-07-06 |
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