CN1714579A - Method and apparatus for predicting a cell change - Google Patents

Abstract

A method and apparatus i) permit the mobile to set and adjust thresholds that control when and how the mobile reselects a cell, ii) enable the mobile to predict the likelihood of cell reselection and iii) enable the mobile to notify the network when a reselection is highly likely during the course of a packet data transmission, which in turn enables the network to take appropriate action in the assignment of a new cell on which to continue packet data interchange. Alternatively, such reselection may be communicated to a virtual bearer for use in controlling a queue.

Description

Be used to predict the method and apparatus of cell change

Technical field

The present invention relates to the sub-district gravity treatment, and more specifically, relate to the method for the possibility that is used to predict the sub-district gravity treatment.

Background technology

The general packet radio service (GPRS) and the whole world that is used for global system for mobile communications (GSM) evolve to strengthen data (EDGE) have been introduced ability from the user data exchange to the mobile wireless product.GPRS, and superset EDGE allow to use wireless and Internet resources efficiently: i) based on grouping when data transmission characteristics is following; Ii) be interrupted, acyclic; Iii) may be frequent, segment transmission data (for example less than 500 bytes); Or iv) may be not frequent, big section transmission data (for example surpassing the hundreds of kilobytes).Envision user's application at the beginning and comprise explorer, Email, file transfer and other application, the transfer of data of wherein " do one's best " (best efforts) suits.

Original GPRS and EDGE standard, it appears at version R97 and R99 (being referred to as R97/R99 here) at the beginning respectively, adds the user grouping data, services of doing one's best to existing GSM voice service.Because GSM does not provide the user grouping data, services at the beginning, the original GPRS of R97/R99 and EDGE provide and are designed to operate in for the architecture environment that provides voice service to optimize, and this has seriously limited the capacity and the expandability of these services.These restrictions are taken as rational compromise, and it allows to introduce new service, reduce the influence to existing framework and/or the old service of GSM simultaneously.

The basic GPRS/EDGE datum plane system architecture of Fig. 1 version of display R97/R99.Usually, mobile radio station 101 and base station controller (BSC) 106 communicate via one of base station 103-105.Base station controller is communicated by letter via interface A with circuit switching (CS) territory, and communicates by letter via interface Gb with packet switching (PS) territory.

Original GSM territory is a circuit commutative field, voice traffic thereon between wireless subsystem (representing) and public switch telephone network (PSTN) 108 by base station controller 106 (Fig. 1) and base station transceiver station (BTS) 103-105 via the A interface route to mobile switching centre (MSC) 110.Packet-switched domain is via agreement control unit (PCU) 112 routes, agreement control unit 112 comprises Radio Link Controller (RLC) and medium access control (MAC) layer (not shown), grouped data on packet-switched domain via 2G Gateway GPRS Support Node (GGSN) 114 and borde gateway 118 routes that are connected to packet data network 120.Packet Data Network can, such as, be internet or private data net.

Except that few exception, cooperating between circuit commutative field and packet-switched domain is few more good more.In addition, original R97/R99 standard is not supported the packet-switched domain " vivid changing " between multi-grouping data stream, service quality (QoS) control, real-time Data Transmission or sub-district and/or the network domains.

For GPRS, there are not definition and the flow process that is used for the switching flow equivalence of circuit switching GSM speech and data call.As an alternative, during the pattern of having set up Temporary Block Flow (TBF), use " company of having no progeny (break-before-make) earlier " gravity treatment to support the mobile radio station mobility.As a result, when carrying out the sub-district gravity treatment, interrupt input traffic at every turn.

More particularly, mobile radio station can carry out the sub-district gravity treatment when being in GPRS standby and standby condition.Definition is used for the sub-district that will monitor of sub-district gravity treatment in broadcast allocation (BA) tabulation, on PBCCH, perhaps when PBCCH does not exist on BCCH, broadcast this tabulation.In packet transfer mode, mobile radio station is carrier wave and indicated all bcch carriers (neighbor cell) of BA tabulation of Monitoring Service sub-district constantly.In each tdma frame, in turn, at least one bcch carrier, carry out received signal horizontal survey sampling.

For carrying out reselection decision-making,, calculate and safeguard received signal horizontal average (being labeled as RLA_P) according to the moving average (running average) of the sample of on 5 seconds time period, collecting for each bcch carrier.Sample as far as possible evenly distribution on the time period of assessment for each allocation of carriers.For effective RLA_P value, need the signal level of 5 receptions to measure sample at least.

Abide by GSM standard, following cell reselection criteria (with dBm tolerance) is used for GPRS.

A. use path loss criterion parameter C1 (3GPP TS 05.08,6.4) as being used for the minimum signal level standard of the sub-district gravity treatment of GPRS, its mode be used for the identical of GSM idle pulley.The C1 of each sub-district (Serving cell and neighbor cell) calculates and is based on corresponding RLA_P value.

B. use sub-district classification (ranking) canonical parameter C32 (3GPP TS 05.08,6.4) from sub-district, to select the sub-district with equal priority.For Serving cell, C32 equals corresponding C 1.For each neighbor cell, C32 equals the corresponding C 1 crossed with the Cell Broadcast CB parameter modification.

C. use the signal level threshold canonical parameter C31 (3GPPTS 05.08,6.4) of layered cell structure (HCS) to assess the layering GPRS of prioritization.

At least for each new samples or each second (getting the maximum among both), mobile radio station upgrades RLA_P and is the value that C1, C31 and C32 are calculated in Serving cell and non-service (neighbours) sub-district.If following situation takes place, mobile radio station carries out the sub-district gravity treatment:

I) the path loss criterion parameter C1 of Serving cell drops to below zero.

It is better than Serving cell ii) to assess suitable non-service cell (seeing 3GPP TS 03.22).

Best cell is the sub-district with the highest C32 value.

When the assessment best cell, from the C32 value of neighbor cell, deduct lagged value.On the PBCCH of Serving cell, broadcast lagged value.When taking place in formerly 15 seconds of sub-district gravity treatment, lagged value equals 5dB.If in 10 seconds, do not find suitable sub-district, carry out the cell selecting algorithm of 3GPP TS 03.22.

Because the simplicity of cell change mechanism, add in the city high-frequency of sub-district gravity treatment in the environment, the frequent generation of sub-district gravity treatment can seriously influence user data-throughput.Yet, do not know when gravity treatment will take place.

Description of drawings

By checking following embodiment together with following accompanying drawing, with understanding and cognition the present invention and corresponding advantages that provides and characteristic best, similar numbering is represented similar assembly among the figure, wherein:

Fig. 1 is schematically showing of wireless cellular system.

Fig. 2 is the circuit signal of the mobile communication equipment that is connected to BTS of block diagram form.

Fig. 3 is the block diagram of the software architecture of explaination mobile communication equipment.

Fig. 4 is the block diagram of explaination in accordance with the part of the mobile communication equipment of Fig. 3.

Fig. 5 is the state diagram of explaination mobile communication equipment mode of operation.

Fig. 6 is the state diagram of explaination TBF ON and OFF state transitions.

Fig. 7 is the state diagram that explaination virtual bearer queue input state shifts.

Fig. 8 is the state diagram that explaination virtual bearer queue output state shifts.

Fig. 9 is the block diagram of explaination virtual bearer control.

Figure 10 a and 10b are the flow charts of explaination mobile radio station and network operation.

Figure 11 is the block diagram of explaination in accordance with another alternative embodiment of the part of the software architecture of Fig. 3.

Figure 12 is that the explaination mobile radio station moves schematically showing through the sub-district of cellular system.

Figure 13 is the schematically showing of cell change control in the mobile communication equipment.

Figure 14 is the block diagram of further explaining the cell change control of mobile communication equipment.

Figure 15 is the expression that the gravity treatment of fallout predictor is measured.

Figure 16 is the expression of the reselection criteria of fallout predictor.

Embodiment

The invention provides a kind of mobile communication equipment, and the method for operation mobile communication equipment, comprise at least one frame of storage, and apply flow control with support network reselection to low layer from the signal of communication of network reception.Low layer is the layer that is positioned under the virtual bearer.Abide by one aspect of the present invention, send message, the virtual bearer mode of its indication mobile communication equipment support operation to network.According to the response that receives after such transmission, mobile communication equipment optionally operates in virtual bearer mode.In addition, advantageously, the flow control at virtual networking can be dependent on detected cells and changes at hand.By this way, after existing system is carried out little change, can adapt to interruption and not tolerate data pattern.

Wireless Telecom Equipment 101 (Fig. 2), being also referred to as subscriber equipment, mobile radio station, can be that fix or portable cellular radio, PDA(Personal Digital Assistant), the modulator-demodulator operated with PC or operate in any miscellaneous equipment in the wireless communication system (for example exemplary gsm system of Fig. 1).Communication equipment comprises antenna 202, radio frequency (RF) transceiver 204, controller 206 and user interface 208.Antenna 202 can use any suitable antenna to realize.Transceiver 204 can be integrated with controller 206 or be separated, and can use any suitable wide area wireless interface communication circuitry to realize, for example radio frequency (RF) cellular transceiver that realizes of hardware or software.Controller 206 can comprise logical circuit, internal memory and software, and provides function for communication equipment.One or more realizations in below it can use: microprocessor; Digital signal processor; Microcontroller; FPGA (Field Programmable Gate Array); Or the like.User interface 208 made things convenient for to or come the information of self-controller or transceiver or the transmission of control.User interface 208 can comprise any equipment interface, for example below in one or more: keypad; Transducer; Display; Local connects, and for example infrared or radio frequency local connects, or the like; And connector, for example USB, RS-232 connector, or the like.

Mobile radio station software architecture in the communication equipment controller 206 is represented in Fig. 3.Controller 206 in the mobile radio station 101 comprises physical layer 302, forms interface between itself and the radio-frequency (RF) transceiver 204.The reception and the transmission of physical layer 302 scheduling physical datas are carried out receiver gain controlling, transmitter power control, signal level is measured and other function in greater detail not here.The transmission and the reception of the packet-based information of media access controller (MAC) 304 tissue turnover physical layer interfaces 302.Media access controller 304 mainly comprises such logic, by it, and the right that mobile radio station 101 was sent on up link preset time, and, be notified to mobile radio station 101 to the affirmation of the message that on down link, sends to mobile radio station 101.

Radio Link Controller 306 control mobile radio stations 101, it is about the signaling of the network-oriented that belongs to wireless information, be time slot distribution, Packet Data Channel foundation/dismounting, RF channel allocation and other function in greater detail not here, together with transmitting automatic network and via the message of physical layer interface 302 transmission.Radio Link Controller 306 relates generally to the error correction of radio layer,, absorbs the periodic mistake that is caused by fading channel that is, and handles the GPRS/EDGE transfer of data and set up and the particular aspects of removing.By this way, Radio Link Controller 306 is by confirming and retransmitting the integrality of safeguarding Radio Link.

For grouped data, logic link control device (LLC) 308 is a packet radio with network protocol packet data packetizing (promptly dividing), with wireless transmission in radio-frequency channel 102, and provides compression and cryptographic services.Subnetwork convergence/dispersion protocol unit (SNDCP) 310 will separate packetizing/be divided into network protocol packet data, with the application interface 311 that sends to mobile radio station 101 by the packet radio that mobile radio station 101 receives.Switching network protocol data between the respective application of application interface in subnetwork convergence/dispersion protocol arrives mobile radio station 101.By this way, between application interface and physical layer 302, come transmission user or traffic packet data by subnetwork convergence/dispersion protocol 310, logic link control device 308, Radio Link Controller 306 and media access controller 304.

Controller 206 further comprises radio resource manager (RRM) and GPRS radio resource manager (GRR) 316, with mobility and allocation of radio resources in the management sub-district.Mobile management (MM) and GPRS Mobility Management (GMM) layer 318 management minizone mobility.

The voice path of digitize voice is by physical layer 302 and CODEC 322.CODEC receives the input voice from user interface, and transmitting on up link, and the voice output that will receive from down link is to user interface 208, to regenerate by the loud speaker (not shown).Can see that speech is handled by the path of separating with packetized data in mobile radio station 101, this has reflected speech and the different paths of packetized data flow in network, as shown in Figure 1.This system configuration allows to add GPRS/EDGE to existing voice network, and does not damage existing reliable GSM old saying system for electrical teaching.

A restriction of this existing system is that it does not support to require the data communication not interrupting connecting, is called interruption here and does not tolerate communication.The example of such communication is stream video or music.This is because GPRS/EDGE uses " company of having no progeny (break before make) earlier " gravity treatment to support the mobile radio station gravity treatment, sets up Temporary Block Flow (TBF), and is such as is known to persons skilled in the art.As a result, when carrying out the sub-district gravity treatment, input traffic is interrupted at every turn.

Interrupt not tolerating transfer of data for mobile radio station 101 is adapted to,, in mobile radio station 101, insert virtual bearer 312 simultaneously to existing GPRS/EDGE systematic influence minimum.Those skilled in the art will recognize that, down link, promptly the path from the network to the mobile radio station is the primary link of obeying (subject to) such communication, therefore describes virtual bearer with reference to down link.Yet, will recognize that virtual bearer also can find application in up link.Exemplary virtual bearer 312 is inserted between logic link control device 306 and the wireless logic link 308.Thereby virtual bearer 312 storages, so that be input to logic link control device 308 are in the future used for the application of mobile radio station 101 from the down link data of Radio Link Controller.By virtual downlink bearer component logically is inserted on 306 layers of the Radio Link Controllers with 308 layers of logic link control devices under, virtual bearer is operated on the logic link control device frame of assembling in receiving terminal.The function of virtual stream downlink bearer 312 is when down link does not interrupt, the storage down link data, and in thereafter when the interruption of down link stream the time, provide the data of storage to the logic link control device.By this way, virtual bearer continues to provide data to the logic link control device, up to recovering connection.

To virtual bearer 312 be described in more detail from reference Fig. 4 below.In first embodiment, this embodiment is the expansion of the existing general framework of GPRS/EDGE, by interface 313,315, with single new virtual bearer 312, virtual stream bearer circuit for example, be inserted in the mobile radio station 101, between logic link control device (LLC) 308 and Radio Link Controller (RLC) 306.Shown in virtual bearer 312 receiving downlink datas, and it is loaded into formation 402.To be input to logic link control device 308 via interface 315 from the output signal of this formation.Usually, for the stream bearer circuit, formation input control is inserted into data in the formation, so that i) guaranteed before sending any data to the logic link control device, downlink data queue is filled into abundant degree, and ii) queuing data is maintained abundant level, no matter when receive data.

Can be below handling two in the parameter (discretely or in combination) control virtual bearer queue 402:

● I/O data transfer rate ratio; With

● virtual bearer queue size (low watermark and/or high watermark).

One of skill in the art will appreciate that by controlling these parameters, can adapt to the sub-district gravity treatment and do not lose flow data, even also be like this when down link interrupts.

More particularly, will use following variable to describe the operation of virtual bearer:

Ton: Temporary Block Flow ON: in this state, carrying out packet data transmission;

Toff: Temporary Block Flow OFF; In this state, do not carry out packet data transmission, or Temporary Block Flow, still " preparation timer " moves, and packet transmission operations is arrived in permission fast return before it expires;

I IDLE: packet idle mode.Not having Temporary Block Flow, and prepare timer and expire, is to obtain Temporary Block Flow, needs to set up fully;

The A Temporary Block Flow begins.There is not active packet data transfer;

Rs prepares timer and begins;

Rx prepares timer and expires;

Re prepares timer and removes;

F opens downlink chain circuit data stream from RLC;

Data＜queue low-water mark QL in the QLL downlink data queue;

Data in the QHH downlink data queue〉the high watermark QH of formation; With

S is to the LCC transmit frame.

In operation, suppose that virtual bearer was activated, and perhaps is waken up when each Radio Link Controller had a logic link control device frame that assembles fully to send.Each VSB process is waken up, and it follows following rule set to control its execution:

Determine the state of RR/GRR:, then do not require the automaton operation if not at packet transfer state Ton.In addition, write down last GRR state, make and when Ton EQ TRUE next time, can test (I＜-Ton).

IF GRR state Ton EQ TRUE

IF(I<->Ton)EQ?TRUE

Variable V SB_Reset=TRUE is set

FI

＜execution input rank automaton 〉

＜execution output queue automaton 〉

FI

Virtual stream bearer circuit (VSB) logic comprises three state automatas:

1) in GSM standard Radio Resource state transitions, add sub-state, this sub-state is based on when being in transmitted in packets or double-transmission mode, and whether " preparation timer " moves.This can be described as the master control automaton.

2) formation input automaton, it controls to the data input of downlink data queue by the stream on the control wireless medium.

3) formation output automaton, its control output from downlink data queue to the LLC layer.

Control this operation downlink data queue is maintained abundant level, so that the i) influence of minimum jitter, transient change in the transfer rate that this shake is caused by scheduling, re-transmission etc. produces and ii) reduces the successional influence of sub-district gravity treatment to downlink chain circuit data stream.

In addition, virtual bearer is placed on the Radio Link Controller, set up logic, further reduced its influence existing assembly by allowing in Radio Link Controller, to reuse interim piece.In other words, even with transparent mode operate wireless link controller the time, it still is responsible for being initiated as beginning and the necessary signaling of management Temporary Block Flow.

To major state be described about GPRS/EDGE GSM term and with reference to Fig. 5 and 6 below.These states of following control.When communication did not take place, phone operation was in idle/idle packet mode 502.When distributing radio resource, enter dedicated mode 504, and when discharging Radio Resource, stop this pattern.When initiation packet inserts, enter packet transfer mode 506, and when stopping Temporary Block Flow, stop this pattern.When simultaneously speech and block data communication being arranged, double-transmission mode 508 takes place.

With reference to Fig. 6, when the mobile wireless resource status is in i) double-transmission mode (DTM) and Temporary Block Flow carry out, when perhaps ii) only being in packet transfer mode, the situation of TBF ON state 602 for expressing.At state TBF OFF 604, prepare the timer operation, be such situation, prepare wherein that timer moves and TBF closes, no matter when note Temporary Block Flow fair termination just beginning to prepare timer.Do not having movable Temporary Block Flow, and preparing in the situation that timer moving, do not requiring that complete signaling sets up sequence so that begin new Temporary Block Flow.State 606 expression idle packet.

The input rank automata representation is in Fig. 7.Before initiating Temporary Block Flow 702, down link data is loaded in the formation 402, and till lasting till that formation 402 is filled.Load formation 704 and reach the high watermark of the formation that indicates (high storage threshold value, it is the capacity limit of formation) up to it.When it reaches this threshold value, stop the storage 706 in the formation.Stop to load formation, reach queue low-water mark (storage threshold value, it is the minimum capacity of formation) up to formation.By this way, but administration queue makes it to remain between the high threshold ones.This queuing process for such as time-delay such as stream audio and video responsive (data arrive use before, some time-delays of user's tolerable) but interrupt not tolerating that the type of data communication of (Once you begin, interruption will cause fault) will be effective.

Inventor's anticipation advantageously, can be controlled virtual bearer more intelligently.Virtual bearer queue state variable S is set to represent the variable of virtual bearer queue occupancy (%).Can followingly recursively define the value of the S of any given time (I+1):

S _i+1＝F(S _i，Q _L，Q _H，R _IO，F _CR)，

Q wherein _LBe VSB queue low-water mark, Q _HBe the high watermark of VSB formation, R _IOBe I/O data transfer rate ratio, and F _CRFrequency for the sub-district gravity treatment that takes place at random.Here output rating adjustment (control) cycle of formation is called T _AdjOutput data rate at each every the end, that is, and for next is provided with at interval.

For any careful control cycle I, a kind of trifling control strategy will be for next output data rate r to be set at interval _Out(i+1), its identical transmission r of data volume that in the LLC layer is provided at the last cycle, arrives from Radio Link Controller _In(i).Like this, the output data rate in cycle (I+1) can be defined as

r _out(i+1)＝r _in(i).

When the inlet flow data transfer rate from Radio Link Controller increased, it is full that virtual bearer queue may become, and require to comprise flow control.When the inlet flow data transfer rate reduced, logic link control device layer was not received enough data, and was applied in " suffering from hunger ".As a result, the quality of services for users sensation will be degenerated.

Abide by another alternative embodiment, the formula above revising is to consider the state of formation 402.The same data volume of interim reception when in this case, the output rating of next time period current content that should equal formation adds formerly.This means:

$r_{\mathrm{out}}(i+1)=r_{\mathrm{in}}\left(i\right)+\frac{S\left(i\right)}{T_{\mathrm{adj}}},$

T wherein _AdjBe the formation adjustment duration in (control) cycle.

No matter utilize among the top embodiment which, those skilled in the art will recognize that, during the gravity treatment of sub-district, it is empty that formation 402 might periodically become.About this point three main causes are arranged: (i) length of the flow interruption that causes by gravity treatment, (ii) use (more properly from the speed of formation consumption data, ratio between formation input and the output data rate) and (iii) queue length (being high watermark and low watermark).

Another alternative embodiment is illustrated among Fig. 9.For virtual bearer queue, control of quality (control criterion) can be defined as the integer of suffering from hunger (integral number) that takes place during session period.The target of controlling mechanism is compared with not controlling " open cycle system ", reduces (minimizing) control criterion.The system of proposing is a combined system, wherein uses the prediction of closed-loop control together with cell change.The inventor further envisions, and the fallout predictor of the sub-district gravity treatment of Fa Shenging also can increase control of quality significantly at random.

More particularly, the formation Control Circulation of formation 402 is illustrated among Fig. 9.Control virtual bearer queue 402 is to keep the quene state of wanting.Another input of Control Circulation is by the gravity treatment order of cell change controller (describing with reference to Figure 15,16) generation and the reselecting parameters that is generated by reselection predictor 904 (also describing with reference to Figure 15,16).In addition, calculate formation I/O (I/O) data transfer rate ratio in frame 906, it is to load the ratio of the speed of formation to the speed of unloading formation.Virtual bearer queue state predictor 908 is predicted quene states, and this prediction is input to the quene state controller.

Controller can dynamically change capacity of queue according to the needs of prediction.Like this, when the sub-district gravity treatment was frequent, wealthy family's limit value (high watermark) QH can be very big.When the sub-district gravity treatment is not frequent, can reduce the limit value QH of wealthy family, (so that) be that in the mobile radio station other used saving internal memory, and reduce the time-delay that causes by formation.One of skill in the art will appreciate that in, even when mobile radio station was physically static, channel may change (not be) such as central London operating environments such as (central London).Quite commonly, according to system parameter setting (lagging behind and the gravity treatment timer), mobile radio station carried out a sub-district gravity treatment in per about 10 seconds, and jumped within two or three sub-districts of same group.In such environment, the very bearer circuit of robust will be required.As alternative another replacement scheme, in such as other environment such as rural environments, except that cell boarder, the sub-district gravity treatment will be not frequent.Internal memory and improper use excessive resource and the introducing improperly time-delay of the present invention by optimal level is provided can adapt to two kinds of environment.

In addition, queue controller 910 scalable output data rates are to maintain constant level with formation when condition changes.At last, reselection component 912 control formations are to operate in interrupt mode, and wherein during the gravity treatment of sub-district, the data of storage are not interrupted output.Control Circulation control formation is to keep substantially constant.In addition, queue size can be according to whether expecting the sub-district gravity treatment and is changed.

Also stipulated queue occupancy target S _Tar, the queue occupancy that it should reach and keep for control system during the session.For increasing control of quality, system samples in each control cycle, measures the input data transfer rate, and keeps its moving average:

${\stackrel{\&OverBar;}{r}}_{\mathrm{in}}\left(i\right)={\stackrel{\&OverBar;}{r}}_{\mathrm{in}}(i-1)+\frac{r_{\mathrm{in}}\left(i\right)-{\stackrel{\&OverBar;}{r}}_{\mathrm{in}}(i-1)}{i},i=\mathrm{1,2,3}...;{\stackrel{\&OverBar;}{r}}_{\mathrm{in}}\left(0\right)=0.$

Adjust (control) cycle for each formation, control algolithm work is as follows:

Step 1: in the beginning of cycle I, with r _In(i) be set to zero

Step 2: during current adjustment cycle i, measure the input data transfer rate and keep moving average r _In(i).

Step 3:, determine virtual bearer queue occupancy S (i) at the end of adjustment cycle i.

Step 4: abide by the output data rate that following formula is provided with next control cycle (I+1):

$r_{\mathrm{out}}(i+1)={\stackrel{\&OverBar;}{r}}_{\mathrm{in}}\left(i\right)+\frac{S\left(i\right)-S_{\mathrm{tar}}}{T_{\mathrm{adj}}}.$

Based on sample at each control cycle Nei Caide, moving average calculation r _In(i).In the beginning of each formation adjustment cycle, replacement moving average r _In(i).This means and adjusting end at interval, the state of formation depends at the observed quene state in the end of last control cycle, and irrelevant with the interval of front.

In emulation, the inventor is definite, and it is no more than 20% to exceed the formation output rating by the input rate that makes formation, and the sub-district gravity treatment may take place.In bad situation reselection simulation, charging ratio exceeds the formation output rating less than 10%, can support to flow signal and be without prejudice at the mobile radio station output.

Abide by another alternative embodiment, no matter when do not use the service of virtual bearer, inventor's anticipation can operate in transparent mode with Radio Link Controller.This is by 314 expressions of the bilateral among Fig. 3.For the transmission that needs virtual bearer, can adopt virtual bearer.On the other hand, for the traditional GPRS/EDGE that does one's best transmission, bilateral virtual bearer.Inventor's anticipation, this can finish by the exchange between network and the mobile radio station.

More particularly, Radio Link Controller 306 sends the notice that needs foundation to GPRS RRM (GRR) layer 316.Abide by an embodiment, but the GRR informing network, and the operation of mobile radio station 101 virtual support bearer circuits is represented as the step 1002 among Figure 10 a.Thereafter, the mobile stations wait response is as indicated in the step 1004.Network can will begin by the operation of indication virtual bearer, as step 1014 is indicated, respond detected notice in the step 1012 in Figure 10 b, and wherein step 1014 explaination is notified mobile radio station and initiated overdimensioned transmission.Such notice can comprise such virtual bearer type, wherein can have a plurality of different virtual bearer.For example, network can be indicated and will be initiated the operation of stream virtual bearer, and it can be to prepare the sub-district gravity treatment to fill formation with the support in more upward initiation transmission of High Data Rate (overdimensioned speed).Thereafter, the GPRS RRM can be notified Radio Link Controller, and when it can begin to send radio block to medium access control (MAC) layer.In addition, this framework is supported transparent mode, and this pattern is walked around virtual bearer, and wherein traditional GPRS/EDGE packet data transmission is just enough.In transparent mode, when not needing virtual bearer, mobile radio station and network operation get seemingly that virtual bearer does not exist.This pattern can be used as from network confirmation of receipt operate in standard mode before, as step 1008 is indicated.When the virtual bearer inertia, network sends data with its normal data rate, as step 1016 is indicated.Those skilled in the art will recognize that as to alternative another replacement scheme of linking up as described herein, GRR can operate so that be independent of network ground and initiate Virtualization Mode (that is, not informing network) between network and mobile radio station.

Another embodiment is illustrated among Figure 11, wherein explains many virtual bearer component 1100.Many virtual bearer comprise a plurality of virtual bearer 312,1102,1104 of being worked in coordination with by common interface layer 1106,1108.By this way, except that collaborative a plurality of radio bearers, can obtain any serializing and/or the prioritization of data.More particularly, first virtual bearer 312 promptly flows virtual bearer, can be the tolerance time-delay, not tolerate interruption, virtual bearer described above.Other bearer circuit that can comprise the communication that is used for other type for example is used to send the background bearer circuit of big background piece, perhaps is used for not tolerating the real-time bearer circuit of the communication of delay.Can operate the common interface layer,, data flow and data on flows to the logic link control device be carried out prioritization so that abide by its priority separately and the needs of application associated with the data.These many bearer component can be used under the situation of bilateral 314 having or do not have.

Like this, can see, the present invention can be applied to existing GPRS/EDGE framework, and i) provide commercial useful characteristic to the operator, and relative low-risk, method fast that this characteristic of introducing ii) is provided to network and mobile radio station manufacturing industry.Also advised the extra possibility of integrated " conversation type " or real-time bearer extension.Adding to agreement in the situation of real-time bearer circuit, will walk around the function of RLC and MAC fully, this is because be very different to the user data of doing one's best with the requirement of Real-time Data Service., with " in real time bearer circuit " expansion replace with the RLC/MAC function of live talk formula service customization, and " tunnelling " may be to flexible layer one notion (Flexible Layer One Concept, FLOC) assembly to physical layer thereafter.

Inventor's anticipation if any virtual bearer operates in transparent mode on the LLC frame of transmission, then can be used existing RLC transparent mode.If virtual bearer operates on the radio block, then create the bearer component of the separation that can be incorporated into existing RLC assembly, may be simpler on framework.In addition, add any virtual bearer and may have appreciable impact the data buffering between the assembly in mobile radio station and the network.In the situation of network, also should consider backhaul capacity.Further, it generally is that part is not inappreciable task that single component is isolated in the influence of characteristic, and for the characteristic of particular type even cannot.Utilize the decision-making of the framework guidance of the type, part should be based on appropriateness.

The inventor also envisions, and can insert virtual bearer in network.If be inserted in the network, this assembly may be limited to agreement control unit (PCU).

Abide by also one side of the present invention, a kind of method and apparatus is provided, its i) allows when and the how threshold value of re-selecting cell of network settings and adjustment control mobile radio station, ii) allow the possibility of mobile radio station prediction sub-district gravity treatment, and iii) during packet data transmission, when gravity treatment very may the time, allow the mobile radio station informing network, this action that allows network to take to suit again distributes new sub-district, continues packet data exchanged on this sub-district.The such gravity treatment of order in single air interface or the network between foreign peoples's air interface (for example GSM and UMTS) can be had.

Figure 12 explains general mobile environment, wherein can advantageously adopt cell reselection prediction.Mobile radio station 101 is just passing through sub-district A, B and C.In diagrammatic sketch, following incident takes place.Initiation packet transfer of data in the A of sub-district.The mobile radio station gravity treatment stops the transmitted in packets (company of having no progeny (break-before-make) earlier) with sub-district A to sub-district B.Mobile radio station attempts inserting sub-district B, goes whistle but insert.Thereafter, mobile radio station 101 gravity treatments are to sub-district C.Mobile radio station successfully inserts sub-district C, carries out routed domain and upgrades, and continue packet data transmission.

Because below, the ability of prediction cell change will be favourable.At first, if in mobile radio station, adopt above-described virtual bearer, can adjust the operation of virtual bearer, to adapt to imminent cell change.Secondly, no matter whether adopt virtual bearer, whether network can pre-determine sub-district B has capacity to serve mobile radio station, and whether sub-district C supports to be used for the acceptable RF parameter with mobile station communicate, and as response to it, directly and mobile station communicate, before interrupting mobile radio station 101 being directed to sub-district C, thereby minimise data is interrupted.

Figure 13 explains the part of mobile radio station 101.Reselection predictor 1302 is in the radio resource layer of mobile radio station 101.Connect reselection predictor, obtain unit 1304 with measurement and receive received signal intensity (RSSI) measurement from physical layer 302.Also rssi measurement is offered cell change controller (CCC), it carries out existing mobile cell known in the art and changes, and the mobile cell that for example finds among the GSM standard 3GPP TS 05.08 changes.The cell change controller is to reselection predictor module 1302 output valve C1.Reselection predictor is the indication of the sub-district gravity treatment of measurement report controller 1304 generation forecasts, and this measurement report controller is set to very (T) by the coming sign of gravity treatment and measures 1306 to network-reporting.Although be described with reference to mobile radio station 101 above, those skilled in the art will recognize that the logical place of proposed equipment can be within Radio Resource (RR) management level of mobile radio station and/or network.

Those skilled in the art also will recognize, the mode that mobile radio station 101 is measured for the purpose of the sub-district gravity treatment of supervising the network control, and how mobile radio station to measure for the normal cell gravity treatment, is known.Mobile radio station is known for mode and rule, the operation selected in idle pulley and packet transfer mode, re-selecting cell will be followed.These rules are implemented in the radio resource layer, and require the support in the physical layer, are called the cell change controller here, (CCC).The existing logical set that this execution is measured is called measures the acquisition unit, and (MAU) 1304, and the logical set of measuring to network-reporting from mobile radio station can be described as measurement report controller (MRC) 1304.

One of the existing assembly of mobile cell reselection logic improved add the additional assemblies that resides in the Radio Resource, be called reselection predictor (RP) module here.This New Parent mainly receives its input from the cell change controller module, and mainly sends its output to the measurement report controller.The purpose of reselection predictor is i) analyze the pretreated measurement that sends to CCC from MAU, and ii) via the MRC informing network.

The structure of sub-district gravity treatment is illustrated among Figure 14.Reselection predictor 1402 has a logic input 1408, also have first and may export 1404, it comprises by " gravity treatment the is coming " bit in the uplink measurement report is set, to " warning " of the network prediction of output to gravity treatment, also have second and may export 1406, it is the form that is sent to the indication that predicts gravity treatment of virtual bearer (VB), and this VB can be, such as, virtual stream bearer circuit (VSB).One of exportable 1404 or 1406 or both.Reselection predictor will be measured the output that obtains module 1410 and import 1408 as its logic.Reselection predictor receives C1 measurement (RSSI) as input from the measurement module 1410 of cell change controller.When the cell change controller determines that gravity treatment must take place (this can be determined by network or mobile radio station), gravity treatment is carried out 1412 and is taken place.

In one embodiment, the mobile radio station framework comprises reselection predictor, and when its prediction gravity treatment may take place.In the exemplary embodiment of Figure 14, reselection predictor 1302 receives the C1 parameter value that calculates based on rssi measurement at input 1406 places from measurement module 1410.Here adopt the C1 parameter value as example, but, can use other standard as alternative another replacement scheme.

Reselection predictor comprises output 1404, when may take place with the indication gravity treatment.In one embodiment, such as mobile radio station is based on the output of reselection predictor, " gravity treatment " bit in the uplink measurement report that sends to network is set, to notify upcoming gravity treatment to network.Exemplary reselection predictor also comprises second output 1406, with to virtual bearer (VB), such as, virtual stream bearer circuit (VSB), perhaps other module of certain on the mobile radio station, the notice gravity treatment is coming.Output one of 1404 and 1406 or both can be provided.

In Figure 14, when requiring gravity treatment, carry out gravity treatment, with response gravity treatment order by the gravity treatment Executive Module on the mobile radio station 1412.The gravity treatment order can produce the judgement that automatic network place or mobile radio station place carry out, as following discuss more fully.

In one embodiment, usually,, and, predict gravity treatment based on the coefficient of curve based on the reselection criteria (RC) of one group of many curve calculation of approaching corresponding C1 set of parameter values from match.In the exemplary embodiment, one group of multiple parameter values y of parabolic curves approximate _i=C1, these parameter values are based at time t _iThe corresponding rssi measurement that obtains.Based on corresponding one group of C1 parameter value, use least square method according to y _iWith t _iFunction come calculated curve coefficient a ₀, a ₁With a ₂In Figure 15, calculate each parabolic curve, to approach five C1 parameter values.For each new C1 parameter value, generate one group of new parabolic curve coefficients, to approach 5 nearest C1 parameter values.In Figure 15, first parabolic curve is based on time t _iTo t _I+4The C1 value, next parabolic curve is based on time t _I+1To t _I+5The C1 value, and next parabolic curve is based on time t _I+2To t _I+6The C1 value, or the like.For each parabolic curve,, use to concern RC=a in the moment corresponding to nearest C1 value ₀+ a ₁t _n+ a ₂t _n ²Calculate reselection criteria (RC).A plurality of reselection criteria (RC) point is illustrated among Figure 15.

An exemplary algorithm of reselection predictor passes through based on a y _jSeek to require initial and, begin n point slip parabola calculation, wherein y _jBe the C1 parameter value from GSM 3GPP standard discussed above, corresponding t constantly _jThe reselection criteria value:

$S_{t0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j;S_{\mathrm{tt}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j;S_{\mathrm{ttt}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j{t}_j;S_{\mathrm{ttt}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j{t}_j{t}_j;S_{y0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{y}_j;$

$S_{\mathrm{ty}0}=\underset{j-1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{y}_j;S_{\mathrm{tty}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j{y}_j;$

Reselection criteria is calculated and is based on the original rssi measurement that is separated in time by interval delta T.

From initialization i=1, carry out following calculating.

BEGIN

RSSIi＝get_RSSI_measurements(ti)；

yi＝calculate_reselection_criteria(RSSIi)；

//Current?sums?based?on?the?previous?ones

B＝S _t(i)＝S _t(i-1)-t _i-1+t _i；

C＝S _tt(i)＝S _tt(i-1)-t _i-1t _i-1+t _it _i；

F＝S _ttt(i)＝S _ttt(i-1)-t _i-1t _i-1t _i-1+t _it _it _i；

M＝S _tttt(i)＝S _tttt(i-1)-t _i-1t _i-1t _i-1t _i-1+t _it _it _it _i；

P＝S _y(i)＝S _y(i-1)-y _i-1+y _i；

R＝S _ty(i)＝S _ty(i-1)-t _i-1y _i-1+t _iy _i；

S＝S _tty(i)＝S _tty(i-1)-t _i-1t _i-1y _i-1+t _it _iy _i；

//Auxiliary?parameters

D＝S _t(i)；

E＝S _tt(i)；

K＝S _tt(i)；

L＝S _ttt(i)；

Q＝D/n；

E＝E-QB；

F＝F-QC；

R＝R-QP；

Q＝K/n；

L＝L-QB；

M＝M-QC；

S＝S-QP；

Q＝L/E；

//Coefficients?of?the?sliding?parabola?ending?at?the?moment?t _n

a ₂＝(S-RQ)/(M-FQ)；

a ₁＝(R-Fa ₂)/E；

a ₀＝(P-Ba ₁-Ca ₂)/n；

//Reselection?criteria?at?the?moment?tn?calculated?based?on

//approximation

RC(t _n)＝a ₀+a ₁t _n+a ₂t _n ²

i＝i+1；

END

Figure 16 is reselection criteria RC and coefficient a ₀, a ₁With a ₂Figure explaination.When continuously the RC value of the evaluated at endpoints of many curves is reducing, and at least some the coefficient a in described continuous many curves ₀, a ₁With a ₂When satisfying the condition of the upcoming gravity treatment of indication, judge that gravity treatment is coming, as following discussion more fully.In one embodiment, when gravity treatment is coming, by concerning T _r=-a ₀(T _d)/a ₁(T _d) determine the estimated time that the sub-district gravity treatment takes place.Time T _dPoint be when to detect potential gravity treatment, and T _c=T _d+ m Δ T is a current time.In one embodiment, when m=3, the prediction gravity treatment is as follows:

IF

0＜RC(T _c)＜RC(T _c-ΔT)＜RC(T _c-2ΔT)＜RC(T _d＝T _c-3ΔT)

AND

a ₀(T _d)＞0ANDa ₁(T _d)＜0ANDsign[a ₂(T _d-ΔT)]＜0ANDsign[a ₂(T _d+ΔT)]＞0

AND

sign[a ₀(T _c)]＞0ANDsign[a ₁(T _c)]＜0

THEN，

The cell reselection prediction time is

T _r＝-a ₀(T _d)/a ₁(T _d).

Reselection predictor can be during connecting continuous service.When satisfying the condition of prediction gravity treatment, will upgrade T at every turn _rWhen no longer satisfying reselection conditions, will not predict the sub-district gravity treatment.

As alternative another replacement scheme, abide by the reselection prediction algorithm of another embodiment and use following step:

Step 1 at first obtains n rssi measurement, wherein n＞2

Step 2 obtains the rssi measurement of ti constantly

Step 3 is whole n cover rssi measurement calculating parameter yi=C1 reselection criteria, and as 3GPPTS 05.08, clause 6.4 is described.

Step 4 is based on front n measurement, and the use least square method is come calculating parameter a according to the function of yi and ti ₀, a ₁With a ₂, n＞3 wherein

Step 5 is n at the eleventh hour, based on a ₀, a ₁With a ₂Calculate Prediction Parameters RC, i.e. RC=a ₀+ a1tn+a2tntn

If step 6 is determined a ₀, a ₁With a ₂Have predetermined relation, and for continuous 3 samples, the RC slope descends, and

If step 6 current period T _dA ₀Be positive, and

Step 7 current period T _dA ₁Bear, and

If step 8 a ₂The negative value of one-period becomes current period T in the past _dOn the occasion of, and

If the parabola RC slope of step 9 prediction is from current period T _dBegin at least 3 cycles that descend, and

If a that goes up some place of step 10 prediction RC ₀Symbol be positive, and

If the symbol of going up the a1 that a bit locates of step 11 prediction RC is born, then

Step 12 thinks that the sub-district gravity treatment is coming, and to calculate its following time be T _r=-a ₀(T _d)/a ₁(T _d)

Step 13 increases the I time interval

Step 14 jumps to step 2.

For each predetermined time cycle Δ T, RP receives the Serving cell rssi measurement from measurement module.As mentioned above, mobile radio station every tdma frame (4.615ms) in the TBF pattern carries out rssi measurement.Time cycle Δ T can be estimated as about 100TDMA frame.

When receiving new measurement, the RP module is calculated one of reselection criteria RC.Here adopt C1 as standard, but the present invention also can use other reselection criteria, perhaps be used to be different from GSM and follow-up standard thereof.

Based on a preceding n reselection criteria (for example, but the n assignment is 5), the formula below RP uses is with parabolic curves approximate RC value:

RC(t)＝a ₀+a ₁t+a ₂t ².

Parameter a0, a ₁With a ₂Determine with least square method (MLS).The thinking that " mobile parabola " approaches is illustrated among Figure 15 with graphics mode.

Top detailed description of the present invention and described example are for explaination and purpose of description.Although top contact particular device is described principle of the present invention, should clearly realize that this only describes the mode by example, but not as the restriction to scope of the present invention.

Claims (18)

1. method of operating mobile communication equipment, it may further comprise the steps:

Along with the past of time, calculate the parameter of indication received signal intensity;

Determine whether there is predetermined relation between the value of described parameter; With

If there is described predetermined relation, determine that gravity treatment is coming.

2. the method for claim 1 wherein saidly determines whether to exist the step of predetermined relation to determine to exist how many predetermined conditions.

3. the method for claim 1, wherein said calculation procedure comprise measures received signal intensity.

4. method as claimed in claim 3, wherein said calculation procedure comprises the method as received signal strength measurement, calculates a plurality of parameters.

5. method as claimed in claim 4, the wherein said step that satisfies at least one predetermined standard that determines whether determines whether to satisfy a plurality of parameters.

6. the method for claim 1, it further comprises step: in case determine that gravity treatment is coming, at least one the transmission message in virtual bearer and network.

7. the method for claim 1, it further is included as the step that relative time is calculated in described gravity treatment.

8. the method for claim 1, it further comprises from network threshold level value information, with the step of control mobile radio station gravity treatment.

9. the method for claim 1, wherein said calculation procedure comprises carries out rssi measurement.

10. method as claimed in claim 9, wherein in the Temporary Block Flow pattern, every time division multiple access frame all calculates described rssi measurement.

11. the method for claim 1, it further comprises step: initiate flow control, determine that to respond gravity treatment is coming.

12. method as claimed in claim 11, it further comprises step: enter flow control in described virtual bearer, with the signal of response from described network reception.

13. method as claimed in claim 11, it further comprises step: enter flow control in described virtual bearer, with the upcoming message of response gravity treatment.

14. a mobile communication equipment, it comprises:

Measurement module;

Reselection predictor, it is connected to described measurement module, and described reselection predictor generates the possibility message of sub-district gravity treatment in described mobile communication equipment, and it is based on the measurement of being undertaken by described mobile communication equipment.

15. Wireless Telecom Equipment as claimed in claim 14, it further comprises virtual bearer, and it is used for applying flow control to described bottom, and described virtual bearer applies flow control, with the upcoming judgement of response gravity treatment.

16. Wireless Telecom Equipment as claimed in claim 15, wherein said virtual bearer are connected to described gravity treatment controller, to receive the possibility message of described sub-district gravity treatment from described fallout predictor.

17. method as claimed in claim 7, wherein said calculation procedure further comprises: by based on corresponding moment t _jA described y _jThe reselection criteria value, seek to require initial and, carry out n point slip parabola calculation.

18. method as claimed in claim 17, wherein said calculation procedure further comprises: determine described moment T _d, constantly at this

a ₀(T _d)＞0&&a ₁(T _d)＜0&&sign[a ₂(T _d-ΔT)]＜0&&sign[a ₂(T _d+ΔT)]＞0

And

Inequality below m reselection criteria RC that calculates continuously satisfies:

RC(T _d+ΔT)＞RC(T _d+2ΔT)＞RC(T _d+3ΔT)＞...＞RC(T _d+mΔT)＞0

Wherein reselection criteria RC uses mobile parabola to approach calculating,

And

sign[a ₀(T _d+mΔT)]＞0&&sign[a ₁(T _d+mΔT)]＜0

Then

The cell reselection prediction time T _rFor

T _r＝-a ₀(T _d)/a ₁(T _d).

Wherein

a ₀＝(P-Ba ₁-Ca ₂)/n；

a ₁＝(R-Fa ₂)/E；

a ₂＝(S-RQ)/(M-FQ)；

D＝S _t(i)；

B＝S _t(i)＝S _t(i-1)-t _i-1+t _i；

C＝S _tt(i)＝S _tt(i-1)-t _i-1t _i-1+t _it _i；

F＝S _ttt(i)＝S _ttt(i-1)-t _i-1t _i-1t _i-1+t _it _it _i；

M＝S _tttt(i)＝S _tttt(i-1)-t _i-1t _i-1t _i-1t _i-1+t _it _it _it _i；

P＝S _y(i)＝S _y(i-1)-y _i-1+y _i；

R＝S _ty(i)＝S _ty(i-1)-t _i-1y _i-1+t _iy _i；

S＝S _tty(i)＝S _tty(i-1)-t _i-1t _i-1y _i-1+t _it _iy _i；

E＝S _tt(i)；

K＝S _tt(i)；

L＝S _ttt(i)；

Q＝D/n；

E＝E-QB；

F＝F-QC；

R＝R-QP；

Q＝K/n；

L＝L-QB；

M＝M-QC；

S＝S-QP；

Q＝L/E；

$S_{t0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j;$

$S_{\mathrm{tt}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j;$

$S_{\mathrm{ttt}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j{t}_j;$

$S_{\mathrm{tttt}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j{t}_j{t}_j;$

$S_{y0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{y}_j;$

$S_{\mathrm{ty}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{y}_j;$

$S_{\mathrm{tty}0}=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{t}_j{t}_j{y}_j;$

RC(t)＝a ₀+a ₁t+a ₂t ²。

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