CN1305688A - Handoven-method in cellular radio system - Google Patents
Handoven-method in cellular radio system Download PDFInfo
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- CN1305688A CN1305688A CN99807487A CN99807487A CN1305688A CN 1305688 A CN1305688 A CN 1305688A CN 99807487 A CN99807487 A CN 99807487A CN 99807487 A CN99807487 A CN 99807487A CN 1305688 A CN1305688 A CN 1305688A
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- 238000010295 mobile communication Methods 0.000 claims description 11
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
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Abstract
Handover in a cellular radio system having several frequency ranges is problematic e.g. from the viewpoint of network capacity utilisation. The invention concerns a handover-method, especially in a cellular radio system having at least two frequency ranges, wherein broadcasting is transmitted in a first frequency range and handover to a second frequency range is started. The method according to the invention is characterised in that bursts transmitted by the mobile station (MS) and relating to the handover signalling are measured therein at the base transceiver station (BTS), the measurement results are compared with a pre-established criterion and handover is completed only when the criterion is met.
Description
The present invention relates to especially to have in the cellular wireless system a kind of changing method in the system that wherein has only a broadcast channel of two or more frequency bands.
Fig. 1 shows the simple block diagram of gsm system (global system for mobile communications).Mobile station MS is connected (under the situation shown in Fig. 1, BTS1 is connected with base station transceiver) by wireless path with certain base station transceiver BTS.Base station sub-system BSS comprises base station controller BSC and attached base station transceiver BTS.Usually, several base station controller BSC are attached to mobile services switching centre MSC.Mobile services switching centre MSC and other mobile services switching centres are got in touch, and GSM Netcom crosses gateway mobile services switching centre GMSC and is connected with other networks (as public switched telephone network PSTN, another kind of Public Land Mobile Nerwork PLMN, ISDN net or intelligent network IN).The operation of whole system is monitored by OMC operation and maintenance centre OMC.The user profile of mobile station MS for good and all is stored among the attaching position register HLR of system, and mobile station MS is when being arranged in the zone of visitor location register VLR at every turn, and its information stores is in this visitor location register VLR.The precision of the positional information opsition dependent district LA of travelling carriage is stored among the visitor location register VLR.The area that visitor location register is monitored is divided into one or more lane place.In each lane place, can there be one or more base station transceiver BTS to carry out work.Each base station transceiver BTS constantly sends a kind of like this information that is assigned to all mobile station MSs with its broadcast channel, and this information comprises base station identity code BSIC, location area identifier LAI and the information of those frequencies of the neighbor base station transceiver that should measure about mobile station MS.
In cellular mobile telecommunication system, utilize several sub-districts that slightly overlap mutually to realize wireless coverage.Travelling carriage can arbitrarily move in the zone of travelling carriage network, and can get in touch with ready-to-use best base station transceiver signal.When a sub-district moved to another sub-district, the transfer criterion according to predetermined switched to a new wireless area during travelling carriage is being called out.Should carry out switching with the method that ongoing calling is caused minimum as far as possible interference.For the requirement that can in mobile communication system, draw switching and can select the suitable Target cell of switching, need the measurement result of the field intensity of the various measurement results of quality of connection and adjacent cell.The criterion of switching usually according to wireless path is performed, but also may switch because of other reasons (for example for distribute load or in order to reduce through-put power).Also can in the sub-district, carry out switching from a Traffic Channel to another Traffic Channel.
Mobile station MS is constantly measured those broadcast channel signals from its nearest base station transceiver BTS, so that for example determine to provide the base station transceiver of optimum signal and prepare the switch of feasible sub-district.According to the adjacent cell information that each base station transceiver is sent on its broadcast channel, travelling carriage can be discerned those adjacent cells that it should be noted.Mobile station MS sends measurement result through serving BS transceiver BTS1 to base station controller BSC termly, as report message.Report message comprises the measurement result of this serving BS transceiver and the measurement result of six best neighbor base station transceivers only.Base station transceiver BTS finishes the measurement of the signal level and the quality of all wireless connections of carrying out in this base station transceiver.
Under following situation, can carry out from Serving cell to certain adjacent cell switching or to the switching of another channel of this Serving cell: for example show that signal level the current channel of Serving cell and/or quality are low and can obtain better signal level or on another channel, can obtain better signal quality when the measurement result of travelling carriage and/or base station transceiver, perhaps when a certain peripheral cell/other channels allow to communicate by letter with lower transmission power level from peripheral cell.The selection of the Target cell that switches for example is subjected to the influence of the signal level/load of Target cell.Therefore, usually used transfer criterion for example is the through-put power that travelling carriage is desired and travelling carriage is allowed in the signal level, Target cell of the signal level of wireless connections and quality, former sub-district and the signal level of Target cell, former sub-district.Switching from a Traffic Channel to another Traffic Channel is carried out when satisfying the determined transfer criterion of network operator usually.In addition, also be necessary to switch during overload.
Base station controller BSC is made the decision that relates to switching.If Target cell is attached to another base station controller BSC, switches so and can under the control of moving exchanging center MSC, finish.Also can in mobile services switching centre MSC, concentrate all the time to make and switch decision.When needing, base station controller BSC is sent a switching command by base station transceiver to mobile station MS.
Fig. 2 a shows the signaling of institute's relaying in the switching between the transceiver unit TRX of two base station transceivers in the GSM net.Under the situation of the switching starting in Fig. 2 a, for example in order to send voice, data or signaling, for mobile station MS has been set up radio communication by former TRX.When base station controller BSC was found to switch to the channel of another base station transceiver, base station controller BSC activated message 21 to target TRX transmitting channel, and notice needs to switch and request target TRX distributes a wireless channel for this travelling carriage.Target TRX is wireless channel of allocation of communications, and in channel activation confirmation message 22 this is notified to base station controller BSC.Base station controller BSC sends to the information of new wireless channel the former TRX of at present used base station transceiver in switching command (message 23).Base station transceiver sends to mobile station MS with this radio channel information in switching command message 24.Mobile station MS is finished switching by the wireless channel that enters into new appointment, and sends a connection request to target TRX in switching addressing pulse train message 25.Mobile station MS sends these and switches addressing pulse train message on some interval, receive replying from base station transceiver up to it.After receiving the connection request of mobile station MS, target TRX sends an affirmation to travelling carriage in physical information message 31, and for example also starting simultaneously, travelling carriage transmits needed timing advance for it.Then, setting up link by message 32 SABM and 33 UA between the target TRX of mobile station MS and new base station transceiver is connected.After link connected foundation, mobile station MS sent an affirmation of finishing switching smoothly to target TRX in handoff completion message 34.The relevant information of switching smoothly is forwarded to base station controller BSC in handoff completion message 35.Mobile station MS is proceeded its communication by this target TRX.The former TRX and the target TRX that switch also can be in same base station transceivers.If former TRX is attached to different base station controllers with target TRX, then to come transmitting signaling by mobile services switching centre MSC.
Because the interference on the wireless path is switched and might be failed at any time.Fig. 2 b shows the signaling under the failed handoff scenario.As for message 21-25, switch to carry out with mode identical described in the prior figures 2a.Then, if mobile station MS does not receive replying its connection request (message 25) in certain the predetermined in advance period, so, because base station transceiver fails to receive connection request or because travelling carriage fails to receive the affirmation of the connection request of base station transceiver, so mobile station MS will turn back to that channel of the former TRX when switching beginning.Be connected setting up link between mobile station MS and the former TRX by message 36 SABM and 37 UA.After link connected foundation, mobile station MS sent the message of a handoff failure to former TRX in switch failure information 38.The information of relevant handoff failure is forwarded to base station controller BSC in switch failure information 39.Mobile station MS is proceeded its communication by former TRX.
Fig. 2 c shows the signaling diagram that switches during the calling when former channel switches to destination channel in the sub-district.When base station controller BSC was found to need to switch, it activated in the message 21 at channel and sends a channel assignment request to destination channel, and its mode is identical with the mode described in the prior figures 2a.In addition, in the message 22 affirmation of wireless channel data and notice also to be sent out with mode identical described in the prior figures 2a.Base station controller BSC sends to the former channel that present signal post uses with the data of new wireless channel in assignment command message 23, and then gives mobile station MS with this data forwarding in message 24.Mobile station MS is after receiving the assignment commands that forwards new channel to, and it sends message 32 with destination channel, connects to set up the SABM link.Base station transceiver is confirmed this connection by message 33 UA.In order to finish switching, travelling carriage sends channel allocation message smoothly with new channel in having assigned message 34.Base station transceiver is transmitted to base station controller with this information again in having assigned message 35.
Fig. 2 d shows during the calling signaling diagram of handoff failure in the sub-district.Message 21-24 with 32 to be sent out with mode identical described in above Fig. 2 c.Connect and set up message or connect the affirmation of setting up because base station transceiver fails to receive link because travelling carriage fails to receive the link of base station transceiver, so the handoff failure in the sub-district.After a wait acknowledge period, that the former channel when mobile station MS begins to switch sends to network with the channel allocation failure in distributing failed message 38.Base station transceiver is transmitted to base station controller BSC with the channel allocation failure in distributing failed message 39.
In the mobile communication system of utilizing code division multiple access (CDMA) technology to realize, this switching of Zhi Hanging in the above described manner is called direct-cut operation.In addition, cdma system also can adopt so-called soft handover, and wherein, in handoff procedure, travelling carriage can be connected with network by several base station transceivers simultaneously.When this station of signal indicating at certain station in these base station transceivers was best station, travelling carriage was disconnected with being connected of other base station transceivers, only called out and proceeded by this best base station transceiver.When travelling carriage was in the edge zone of sub-district, soft handover had been avoided the switching back and forth between the base station transceiver.
In the cellular wireless system with two kinds of different frequency ranges, the switching from a frequency range to another frequency range quite has problem, especially more is a problem when having only a broadcast channel in the cellular wireless system.For example, with in the gsm system of the band operation of about 900MHz and the combined system with the DCS system of the band operation of about 1800-1900MHz, for example can be at broadcast channel of GSM frequency range realization.Therefore, mobile station MS can only be measured the base station transceiver signal with the GSM frequency transmission.Therefore, call setup is always from the frequency range of broadcast singal, this be because, need this broadcasting for making travelling carriage and Network Synchronization, switch to another frequency range and reattempt during the calling.As everyone knows, under the situation of a broadcast channel, realize switching between GSM and the DCS frequency with two kinds of diverse ways: 1) the sufficiently high threshold value of setting in transfer criterion, broadcast singal must satisfy this criterion before switching to another frequency range, perhaps 2) in using, test arranges the Traffic Channel of another frequency range, thereby during calling out, on this Traffic Channel, carry out the conventionally measurement of line link and down link, and if signal not so good then carry out the new switching that turns back to first frequency range.In above-mentioned second method, the criterion that can switch to another frequency range is set to the value lower than the value in the first method, as mean value.
In the art methods of realize switching, especially in above-mentioned cellular wireless system with two kinds of frequency ranges, its problem of first method is: from the network capacity angle, safe switching threshold is uneconomic, thereby has wasted network capacity.Because the scope of the base station transceiver signal of the smaller frequency range of scope of the base station transceiver signal of big frequency range is little, and the signal of different frequency with the distance with different rate variation, therefore, for example near switching in base station transceiver, carry out, must propose even too high requirement the safety switching threshold.In addition, another frequency range made full use of during this secure threshold also will be unfavorable for communicating by letter.Above-mentioned second kind of its problem of implementation method is: must carry out new switching so that making to connect turns back to first frequency range if wireless signal is not so good really, so, when measuring on Traffic Channel, quality of connection can descend on another frequency range.At this moment, because travelling carriage suffers the influence of bad wireless signal, so quality of service can be impaired.
The objective of the invention is, propose a kind of changing method, this method can be saved the capacity that cellular wireless system especially has only the system with a plurality of frequency bands of a broadcast channel.
Utilize the method according to this invention can reach this purpose, described in its feature of this method such as the independent claims.Described in preferred implementation of the present invention such as the appended claims.
The invention still further relates to mobile communication system and base station transceiver.
The present invention is based on such thought: after switching beginning, measure the signal that base station transceiver receives, have only when the signal of travelling carriage satisfies predetermined criterion, just to allow to switch and proceed from travelling carriage in conjunction with hand off signaling.Therefore, the performance of switching depends on the uplink signal that receives in the base station transceiver place.Do not satisfy the criterion of setting if find the signal of travelling carriage at the base station transceiver place during hand off signaling, the communication that connects is not so transferred on the new channel, but the former channel that continues when switching beginning connects.
The advantage of the mobile communication system of this method and this method of realization is: because the situation of accepting of switching target small area depends on the actual wireless measurement result, therefore will improve the benefit and the capacity of cellular wireless system.Therefore, utilize this method according to the present invention that channel management is improved.
Another advantage that this switching according to the present invention obtains is: in view of measurement, saved network capacity, because to not needing long operation, allocated channel is not given it, therefore saved the radio channel resource simultaneously.
In addition, the advantage that also has according to this switching of the present invention is: in the switching, it is good that quality of service also keeps.
Below, in conjunction with some preferred implementations and with reference to the example shown in Fig. 3 in the accompanying drawing-8 the present invention is described, wherein:
Fig. 1 shows requisite for the purpose of the present invention those parts in the mobile radio communication;
Fig. 2 a-2d shows the hand off signaling of prior art;
Fig. 3 shows the example of the part radio coverage of the cellular wireless system with two frequency ranges;
Fig. 4 shows the flow chart according to changing method of the present invention;
Fig. 5 shows in first kind of execution mode of the present invention hand off signaling in the switching between two signals;
Fig. 6 shows the hand off signaling in switching in the Cellular Networks in first kind of execution mode of the present invention;
Fig. 7 shows in second kind of execution mode of the present invention hand off signaling in the switching between two sub-districts; With
Fig. 8 shows the structured flowchart according to requisite those parts for the purpose of the present invention of base station transceiver of the present invention.
The present invention can be applicable to various mobile communication system.Below, be that example describes the present invention in detail mainly with the Digital GSM-DCS mobile communication system that is operated on two frequency bands.Fig. 1 shows the simplified structure of said GSM net.As for the detailed description of this gsm system, referring to GSM suggestion and reference book ISBN:2-9507190-0-7 " M.Mouly ﹠amp; M.Pautet, ' TheGSM System for Mobile Communications ', Palaiseau, France, 1992 ".
Below, according to first kind of execution mode of the present invention and with reference to Fig. 3-6 in detail the present invention is described in detail.
Fig. 3 shows the cellular footprint of two the base station transceiver BTS1 and the BTS2 of cellular wireless system with two frequency bands.Cell footprint C1 and C2 represent the GSM sub-district of low-frequency range, and cell footprint C3 and C4 represent the DCS sub-district of high band, and the DCS sub-district is littler than the area of coverage of GSM sub-district.When mobile station MS calling out or transfer of data during in cellular system when mobile, offer the switching requirement that the signal measurement result of network connects by the art methods monitoring according to travelling carriage, and carry out by base station transceiver.For example when mobile station MS arrives in the zone of sub-district C3, begin to carry out switching from the transceiver unit TRX1 of sub-district C1 to the transceiver unit TRX3 (not shown) of sub-district C3.Below, the switching of being carried out according to the present invention is described in detail in detail with reference to the flow chart among Fig. 4.
Stage 41 in Fig. 4, for example switching of starting (under the situation shown in the example of Fig. 3, being channel) from the channel of TRX1 to TRX3 from the channel of first frequency range to the channel of another frequency range.According to the present invention, the signal (stage 42) that TRX3 measures the hand off signaling of travelling carriage transmission also compares (stage 43) with this signal and predetermined criteria.If the signal of mobile station MS satisfies the criterion of setting, then proceed to switch, thereby the wireless connections of shifting travelling carriage make it relay (stage 44) by TRX3 by art methods.If the signal of mobile station MS does not satisfy the criterion of setting, then interrupt switching and proceeding the relay (stage 45) of the wireless connections of travelling carriage by TRX1.
Fig. 5 is the detailed signaling diagram according to the switching between two sub-districts of the present invention.Former TRX preferably uses the frequency range channel of broadcast channel and target TRX uses the channel of another frequency range.When satisfying the criterion that sets for the switching of carrying out to second frequency range from first frequency range, switch by the art methods starting.Along with base station controller BSC activates in the message 51 at channel a channel assignment request is sent to target TRX, switching begins to carry out.Except the information of prior art, message 51 also can be used for according to the present invention transmitting such information to target TRX: according to the present invention, the switching of being started is that condition is switched.Message 51 also can be used for providing such criterion for the signal of mobile station MS: satisfy it and just can proceed to switch.Perhaps, can be at O﹠amp; The criterion that will continue in the M process to switch offers base station transceiver.By art methods, target TRX is wireless channel of allocation of communications and this is notified to base station controller BSC (message 22) that base station controller sends to former TRX (message 23) with the information of new wireless channel.Then, by art methods, this radio channel information is sent to mobile station MS (message 24).Mobile station MS is finished switching by the wireless channel that enters into new appointment, and it sends a prior art connection request to target TRX in switching addressing pulse train message 25.Mobile station MS sends these connection request message on some interval, receive replying from base station transceiver up to it.According to the present invention, in the stage 55, target TRX measures the wireless signal of the switching addressing pulse train message 25 that it receives from travelling carriage.According to this wireless signal, base station transceiver is measured as needed one/a plurality of values of criterion of this signal sets.According to the present invention, base station transceiver compares measurement result and set criterion.If mobile station signal satisfies predetermined criteria, then after the stage 57, utilize the affirmation (message 31) of base station transceiver to proceed to switch by art methods.Therefore, also utilize message 32-35 still to carry out hand off signaling by art methods.Communicating by letter between mobile station MS and the network proceeded by target TRX.If judge that by the measurement that the stage 55 is carried out the signal of travelling carriage does not satisfy predetermined criteria, the stage 55 of process from signaling diagram then according to the present invention proceeds to the stage 59.Therefore, base station transceiver will not send any acknowledge message to travelling carriage, then by art methods, mobile station MS at a time after, with with the failed handoff scenario of prior art under identical mode, message 36 is sent to target TRX connects to set up link.The message 37-39 also failed handoff scenario with prior art is similar.In this case, communication will be proceeded by former TRX.
Fig. 6 is according to the hand off signaling figure of first kind of execution mode of the present invention switching in the Cellular Networks from former channel to destination channel during calling out.When beginning to switch according to the prior art criterion, base station controller BSC activates in the message 51 at channel and sends a channel assignment request to destination channel, wherein can transmit such information: according to the present invention according to the present invention, the switching of being started is that condition is switched, and preferably also transmits the criterion that sets for this condition switching.Perhaps, can be at O﹠amp; The criterion that will continue in the M process to switch offers base station transceiver.By art methods, for the allocation of communications destination channel of travelling carriage, and this is notified to base station controller BSC (message 22), base station controller sends to former channel (message 23) with the information of the relevant wireless channel that distributes.Then, by art methods, this radio channel information is sent to mobile station MS (message 24).Mobile station MS is finished switching by the wireless channel that enters into new appointment, and it sends the SABM message 32 of prior art with destination channel.According to the present invention, base station transceiver was measured this signal and measurement result and set criterion is compared in stages 65.If the signal from travelling carriage satisfies the criterion that sets, then since the stage 67, the affirmation that utilizes base station transceiver to send in UA message 33 is proceeded to switch.By art methods, channel allocation provides in message 34 and 35 smoothly.Communicating by letter between travelling carriage and the network proceeded with destination channel.If comparison shows that of stage 65 do not satisfied the criterion that sets from the signal of travelling carriage, then signaling was proceeded from the stage 69 after the stage 65 according to the present invention.Therefore, base station transceiver will not send any confirmation signal to travelling carriage, and travelling carriage sends to network with the channel allocation failure waiting for after certain period will the former channel when switching beginning distributing in the failed message 38.The information of relevant handoff failure is sent to base station controller BSC by art methods in message 39.Communicating by letter between travelling carriage and the network proceeded with former channel.Former channel shown in Fig. 6 and destination channel are preferably all in second frequency range of the system that does not have broadcast channel.
Fig. 7 shows in two switchings between the sub-district hand off signaling figure according to second kind of execution mode of the present invention.Other aspects are similar to first kind of execution mode described in Fig. 5 first message of this execution mode after switching refusal.In this embodiment, target TRX sends a message of switching refusal to mobile station MS in known technically physical information message 71 itself, and therefore in this case, this message can be applicable to new situation and can together use with the new information content.The advantage of this execution mode is, when base station transceiver in message 71 with the negative decision measured and when relatively being notified to travelling carriage, mobile station MS can the relevant handoff failure of faster reception information, so knowing, it turns back to its original channel, rather than travelling carriage sent connection request and waits for the time of certain section prior art appointment before it finds handoff failure.In order to realize this execution mode, must carry out some changes in the network and also must carry out some little changes in the travelling carriage.
Can realize with similar method according to switching in the honeycomb of second kind of execution mode of the present invention.Therefore, the hand off signaling here and signaling shown in Fig. 6 different just refusals switch signaling after (stage 69), therefore, in physical information message, the relevant information of refusing of switching is sent to travelling carriage with destination channel.
Certainly, can also realize above-mentioned switching at the interchannel that is attached to two different base station controller BSC.Therefore, hand off signaling will be propagated by mobile services switching centre MSC.
According to changing method of the present invention also applicable to cellular wireless system with a frequency range, or be applicable to the switching that same frequency range is interior on the contrary, although in having the system that wherein only adopts a broadcast channel of a plurality of frequency ranges, utilize the present invention can obtain maximum benefit.In the switching in a frequency range, for example when the applicability of judging destination channel by measurement result was unreliable, the method according to this invention can be used to carry out quick switching.
According to according to the present invention above-mentioned can be the fixedly criterion that sets of network operator for continue switching the criterion that sets, according to being stored in the formed criterion of derivation of the wireless parameter in the network or for example with the interference level dynamic change of network and will rest on criterion on its currency of measuring based on idle channel.The criterion that sets can comprise one or more threshold values of signal level for example and/or signal-to-jamming ratio and/or other prior art criterions that are fit to.
The mobile communication system that realizes the method according to this invention can be used to the starting conditions switching, so that the criterion of condition switching is provided to base station transceiver, measure the signal of the hand off signaling of travelling carriage at the base station transceiver place, with measurement result and predetermined criteria compares and interrupt switching when finding that according to comparative result mobile station signal does not satisfy predetermined criteria.
Fig. 8 is the block diagram according to base station transceiver of the present invention.Only show requisite for the purpose of the present invention those parts among the figure.Base station transceiver comprises the hand off signaling unit 81 that is used to control hand off signaling of prior art.According to the present invention, base station transceiver comprises: signaling measurement mechanism 82, be used to measure signal and comparison means 83 from the hand off signaling of travelling carriage, and be used for the measurement result of measurement mechanism and the predetermined criteria K that switches according to condition according to the present invention are compared.Base station transceiver receives in the automatic network other local as from the criterion K of base station controller BSC.According to the comparison that comparison means 83 is carried out, obtain a control signal, be used to control the function of hand off signaling unit 81.
These accompanying drawings and relevant explanation only are intended to set forth thought of the present invention.As for its details, can in the scope of claims, change according to switching of the present invention.Although more than be primarily aimed at the TDMA type system specialization the present invention, yet the cellular wireless system that this method also can be applicable to other kinds and not only can be applicable to direct-cut operation but also can be applicable to soft handover as being applied to cdma system.The present invention is applicable to the switching between interior switching of various honeycombs and the sub-district, wherein has one to connect the former channel that can turn back to.Utilization is according to switching of the present invention, makes the channel that can more effectively utilize the frequency range that not have broadcasting, and can improve the practicality of the inside switching of this frequency range.Described the present invention although more than be primarily aimed at cellular wireless system, yet the present invention also is applicable to have a frequency range and two cellular systems with super band with two frequency ranges.The present invention be particularly useful for like this some all do not realize the cellular wireless system of broadcast singal on the frequency range that will use to some extent.
Claims (21)
1. the changing method in the cellular wireless system, this system comprises base station transceiver (BTS) and travelling carriage (MS), in this cellular wireless system, adopt at least two frequency bands, and wherein each base station transceiver sends the broadcasting that is assigned to all travelling carriages with first frequency range, in this method, start to the switching of second frequency range, it is characterized in that:
Locate to measure the pulse train relevant that travelling carriage (MS) sends at base station transceiver (BTS) with hand off signaling,
With measurement result and predetermined criteria compares and
Have only and when satisfying criterion, just finish switching.
2. the method for claim 1 is characterized in that:
When not satisfying the criterion set, interrupt switching and
The former channel of communicating by letter when switching beginning between travelling carriage and the network is proceeded.
3. method as claimed in claim 2 is characterized in that, notifies travelling carriage (MS) with handoff.
4. the method for claim 1 is characterized in that, measures the signal level of the pulse train of travelling carriage.
5. as claim 1 or 4 described methods, it is characterized in that, measure the signal noise ratio of the pulse train of travelling carriage.
6. the method for claim 1 is characterized in that, in channel allocation signaling (51) predetermined criteria (K) is sent to base station transceiver.
7. the method for claim 1 is characterized in that, at O﹠amp; In the M process predetermined criteria (K) is sent to base station transceiver.
8. the method for claim 1 is characterized in that, sentences the new channel measurement of the distributing to connection pulse train from the connection request signaling (25) of travelling carriage at base station transceiver.
9. the method for claim 1 is characterized in that, the link of measuring at the base station transceiver place from travelling carriage connects the pulse train of setting up signaling (32).
10. as the arbitrary described method of claim 1-9, it is characterized in that first frequency range is the low frequency range of frequency of ratio second frequency range.
11. the changing method in the cellular wireless system, this system comprises base station transceiver (BTS) and travelling carriage (MS), and in this method, the switching of starting from former channel to destination channel is characterized in that:
Locate to measure the pulse train relevant that travelling carriage (MS) sends at base station transceiver (BTS) with hand off signaling,
With measurement result and predetermined criteria compares and
Have only and when satisfying criterion, just finish switching.
12. method as claimed in claim 11 is characterized in that:
When not satisfying the criterion set, interrupt switching and
The former channel of communicating by letter when switching beginning between travelling carriage and the network is proceeded.
13. method as claimed in claim 12 is characterized in that, notifies travelling carriage (MS) with handoff.
14. method as claimed in claim 11 is characterized in that, measures the signal level of the pulse train of travelling carriage in the method.
15. as claim 11 or 14 described methods, it is characterized in that, measure the signal noise ratio of the pulse train of travelling carriage.
16. method as claimed in claim 11 is characterized in that, in channel assignment request signaling (51) predetermined criteria (K) is sent to base station transceiver.
17. method as claimed in claim 11 is characterized in that, at O﹠amp; In the M process predetermined criteria (K) is sent to base station transceiver.
18. method as claimed in claim 11 is characterized in that, sentences the pulse train of destination channel measurement from the connection request signaling (25) of travelling carriage at base station transceiver.
19. method as claimed in claim 11 is characterized in that, the link of measuring at the base station transceiver place from travelling carriage connects the signal of setting up signaling (32).
20. mobile communication system, this system comprise base station transceiver (BTS) and travelling carriage (MS), it is characterized in that this mobile communication system is used for:
The criterion (K) that starting conditions switches and condition is switched offers base station transceiver,
Locate to measure the signal of the hand off signaling of travelling carriage (MS) at base station transceiver (BTS),
With measurement result and predetermined criteria (K) compares and
When not satisfying predetermined criteria, interrupt switching according to the comparative result mobile station signal.
21. base station transceiver comprises the hand off signaling unit (81) that is used to control hand off signaling, it is characterized in that this base station transceiver also comprises:
Measurement mechanism (82), be used for measuring from the signal of the hand off signaling of travelling carriage (MS) and
Comparison means (83) is used for the measurement result of measurement mechanism is compared with switching the predetermined criteria of proceeding (K), thereby, according to comparative result, obtain a control signal, be used to control hand off signaling unit (81).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI981486A FI106518B (en) | 1998-06-26 | 1998-06-26 | The handover procedure |
| FI981486 | 1998-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1305688A true CN1305688A (en) | 2001-07-25 |
Family
ID=8552090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99807487A Pending CN1305688A (en) | 1998-06-26 | 1999-06-24 | Handoven-method in cellular radio system |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1090524A2 (en) |
| JP (1) | JP2002519970A (en) |
| CN (1) | CN1305688A (en) |
| AU (1) | AU5039199A (en) |
| FI (1) | FI106518B (en) |
| NO (1) | NO20006599L (en) |
| WO (1) | WO2000001185A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115190552A (en) * | 2017-04-26 | 2022-10-14 | 摩托罗拉移动有限责任公司 | Indicating status of forwarded data |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7206580B2 (en) | 1999-11-04 | 2007-04-17 | Qualcomm Incorporated | Method and apparatus for performing handoff in a high speed communication system |
| ITMI20011629A1 (en) * | 2001-07-27 | 2003-01-27 | Siemens Inf & Comm Networks | PROCEDURE FOR HANDOVER MANAGEMENT MOBILE COMMUNICATION NETWORKS RELATED SYSTEMS AND IT PRODUCT |
| DE102004043881A1 (en) * | 2004-09-10 | 2006-03-30 | Siemens Ag | Communications connection method for delivering a connection in a cellular radio communications system transmits broadcast signals in different frequency bands |
| JP2007150843A (en) * | 2005-11-29 | 2007-06-14 | Kyocera Corp | Radio base station apparatus and communication control method |
| JP4797888B2 (en) * | 2006-08-31 | 2011-10-19 | 株式会社日立製作所 | Wireless communication system, control node, and base station for communication using a plurality of wireless resources |
| WO2011138835A1 (en) | 2010-05-07 | 2011-11-10 | 富士通株式会社 | Wireless communication system, management apparatus, mobile terminal apparatus, wireless communication method and wireless communication program |
| EP4038952A4 (en) * | 2019-09-30 | 2023-10-04 | ZTE Corporation | Wireless network performance analysis |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2296626B (en) * | 1994-12-23 | 1999-07-28 | Nokia Mobile Phones Ltd | Multi-mode radio telephone |
| FI112303B (en) * | 1995-05-16 | 2003-11-14 | Nokia Corp | Multiband Mobile Phone System |
| CA2260139A1 (en) * | 1996-07-16 | 1998-01-22 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for inter-system handoff within a plural hyperband supporting cellular telephone network |
-
1998
- 1998-06-26 FI FI981486A patent/FI106518B/en active
-
1999
- 1999-06-24 AU AU50391/99A patent/AU5039199A/en not_active Abandoned
- 1999-06-24 WO PCT/FI1999/000566 patent/WO2000001185A2/en not_active Application Discontinuation
- 1999-06-24 EP EP99934720A patent/EP1090524A2/en not_active Withdrawn
- 1999-06-24 JP JP2000557647A patent/JP2002519970A/en active Pending
- 1999-06-24 CN CN99807487A patent/CN1305688A/en active Pending
-
2000
- 2000-12-22 NO NO20006599A patent/NO20006599L/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115190552A (en) * | 2017-04-26 | 2022-10-14 | 摩托罗拉移动有限责任公司 | Indicating status of forwarded data |
Also Published As
| Publication number | Publication date |
|---|---|
| AU5039199A (en) | 2000-01-17 |
| FI106518B (en) | 2001-02-15 |
| NO20006599D0 (en) | 2000-12-22 |
| WO2000001185A3 (en) | 2000-02-17 |
| WO2000001185A2 (en) | 2000-01-06 |
| FI981486L (en) | 1999-12-27 |
| EP1090524A2 (en) | 2001-04-11 |
| NO20006599L (en) | 2000-12-22 |
| JP2002519970A (en) | 2002-07-02 |
| FI981486A0 (en) | 1998-06-26 |
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