CN1240563A - Method for admission control in interference-limited cellular radio network - Google Patents
Method for admission control in interference-limited cellular radio networkDownload PDFInfo
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- CN1240563A CN1240563ACN97180791.4ACN97180791ACN1240563ACN 1240563 ACN1240563 ACN 1240563ACN 97180791 ACN97180791 ACN 97180791ACN 1240563 ACN1240563 ACN 1240563A
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Abstract
Description
The present invention relates to a kind of connection control method in the interference-limited cellular radio network, this cellular radio network comprises network portion, double-direction radio between at least one user terminal and network portion and the user terminal connects, and these wireless connections on a channel, are carried out in network portion at least
Determining of channel disturbance threshold value,
The measurement of at least one idle channel interference value,
The idle channel interference value that relatively records and this interference threshold determine whether this channel is available.
In cellular radio network, come transmission information by sending signal between network portion and the user terminal.From the approach of transmitted from transmitter to receiver, there are five kinds of different factors may cause distorted signals at signal: the modulator of transmitter, radiation pattern, i.e. carrier wave, interference source, decline, and the demodulator of receiver.The formed integral body of these factors is called channel.Each base station can have a plurality of channels of any amount.By time (TDMA), frequency (FDMA), the combination in any of sign indicating number (CDMA) or these methods can be separated these channels.Like this, information transmits with signal form on channel.The present invention relates to interference source.Interference source refers in particular to the interference of adjacent channel and is operated in the caused interference of distant transmitter on the same channel.
A purpose of frequency planning is to reduce to be operated in the interference that the transmitter on the same channel causes each other.Can determine by frequency planning which sub-district is which frequency can be used for.In order to make the interference on the channel enough low, the transmitter that is operated on same (or adjacency) channel is enough far away apart.This is known as frequency reuse.Be operated on the same frequency transmitter-receiver between must have certain distance, three times of cell diameter for example.Now developed different re-use pattern therefors, for example the seven cell re-use pattern therefor.According to these schemes, if there is at least one idle channel, then always can set up new wireless connections, because the distance that is operated between the transmitter on identical or the adjacent channel is enough far away, interference value is total to keep fully low thereby make.
Because the cellular radio network number of users increases substantially in the past few years, the same frequency that must reuse in the sub-district is very close to each other.This causes distributing to the very limited frequency band of each network fortune person.Must effectively utilize frequency band, otherwise network can't keep enough users simultaneously, if new user attempts to connect, then not be allowed to, connection gets clogged, and promptly can't distribute to this user radio and connect.
Such cellular radio network is called as interference-limited: the distance between the same frequency of reusing in the sub-district is very near, makes quality of connection be subjected to the restriction of the caused interference of other user, rather than the restriction of background noise.If the interference on the channel is quite strong,, also not necessarily can give new user, because can't reliably transmit voice or other payload in this case with radio channel allocation even channel itself is idle.So just exist obvious defects, because if channel is assigned with use, then the user can find that the quality of service that provides is relatively poor, even may destroy other user's connection.Therefore, except the free time property of channel, must find that also other condition is to determine that connection should be set up or to block.
The purpose of this invention is to provide a kind of method, can realize access control effectively by this method, this method makes frequency to be reused effectively simultaneously.
This realizes that by the method that proposes in the preorder the method is characterized in that, it may further comprise the steps:
The allocated channel amount threshold,
When selecting at least one and be lower than the idle channel of interference threshold and distribute to new wireless connections, determine whether the idle channel quantity that is lower than interference threshold surpasses this channel quantity threshold value, perhaps when blocking new wireless connections, determine whether the idle channel quantity that is lower than interference threshold is less than this channel quantity threshold value.
The invention still further relates to a kind of interference-limited cellular radio network, this cellular radio network comprises network portion, and the double-direction radio between at least one user terminal and network portion and the user terminal connects, network portion
Determine the interference threshold of channel,
Measure the interference value of at least one idle channel,
The idle channel interference value that relatively records and the interference threshold of channel determine whether this channel is available.
The system is characterized in that network portion
The allocated channel amount threshold,
When selecting at least one and be lower than the idle channel of interference threshold and distribute to new wireless connections, determine whether the idle channel quantity that is lower than interference threshold surpasses this channel quantity threshold value, perhaps when blocking new wireless connections, determine whether the idle channel quantity that is lower than interference threshold is less than this channel quantity threshold value.
Method of the present invention has some advantages.It can determine whether to allow new user access network effectively.If the availability of channel depends on the interference value of dynamic change, then the method for Miao Shuing not only can effectively utilize Radio Resource, has also guaranteed the acceptable quality of user.Method of the present invention can realize easily that it is simple technically and effective.
The advantage that has according to system of the present invention with above at this method describe identical.Obviously, can make up preferred embodiment and specific embodiment so that different combinations to be provided, thereby realize required technical efficiency.
Describe the present invention in detail below in conjunction with example according to accompanying drawing, in the accompanying drawings,
Fig. 1 has described a kind of interference-limited cellular radio network;
Fig. 2 has illustrated how to realize according to the solution of the present invention by example in network portion;
Fig. 3 has illustrated the access control step in a flowchart;
Fig. 4 has illustrated the step of definite channel disturbance threshold value in a flowchart.
Investigate Fig. 1.There is a double-direction radio to connect 104 betweennetwork portion 100 and the user terminal 102.The actual parts that generate thenetwork portion 100 ofwireless connections 104 are base stations.Network portion also comprises, for example base station controller, mobile services switching centre and gateway system.The base station has an area of coverage, i.e. a sub-district (mode with hexagonal region among this figure illustrates).Wireless connections 104 are positioned on the channel.May occur on the channel disturbing, be operated in base station terminal on the same channel in especially arbitrary adjacent cell caused interference.
Access control is meant such operation, and can determining to open still by this operation, radio jamming connects 104.Investigate Fig. 3.Method of the present invention may further comprise the steps:
Determine the interference threshold of 300 channels.The interference threshold of channel is meant certain numerical value, disturbs the channel that is lower than this value to can be used for new wireless connections 104.If the interference numerical value that records on this channel is greater than interference threshold, then this channel can't be used for new wireless connections 104.During production process and/or tectonic network, the default value of interference threshold is set.Afterwards, when network comes into operation, dynamically change this value, make it corresponding to condition of work, and/or the network operator for example is provided with this parameter value by network management system by hereinafter described method.
Specify 302 channel quantity threshold values.The channel quantity threshold value (1,2,3 ..., N) be meant certain parameter, it has been indicated and has set up the idle channel how many newwireless connections 104 need be lower than interference threshold.Under the normal condition, a channel just is enough to set up a connection.The network operator for example is provided with this parameter value by network management system.During production process and/or tectonic network, the default value of channel quantity threshold value is set.A plurality of if desired idle channels then when channel disturbance changes, can dynamically change channel allocation, and the quality of thewireless connections 104 that maintenance provides is higher.On the other hand, too much if desired idle channel is to set up newwireless connections 104, and then the obstruction ofwireless connections 104 increases, and the user can find that the quality of service that provides is relatively poor.
Measure the interference value of 304 at least one idle channel.Regularly or the interference value of random measurement idle channel.This can for example realize by the measuring receiver of base station according to existing techniques in realizing.
Idle channel interference value that relatively records andinterference threshold 318 determine that this channel can still be unavailable 320 with 322.In this step, determine whether the interference value of idle channel is low to can be used in newwireless connections 104.
Select 312 at least one when being lower than the idle channel of interference threshold and distributing 314 to give new wireless connections, determine whether the idle channel quantity that is lower than interference threshold surpasses this channel quantity threshold value, perhaps when blocking 316 newwireless connections 104, determine whether the idle channel quantity that is lower than interference threshold is less than this channel quantity threshold value.
Determining of channel disturbance threshold value is a pith of the present invention.Investigate Fig. 4.Being achieved as follows of this deterministic process:
Which mass value of determining the service wireless connections with which interference threshold of channel 400 is associated.This means that with certain particular form for example which mass value the table or the form of mathematical formulae indicate and with which interference threshold be associated.The network operator for example determines this association by network management system.During production process and/or tectonic network, determine the default value association that certain is specific.
The mass value of monitoring 402 and thewireless connections 104 of adding 404 these Network Dept.'s branch services in statistical form (statistics).This means that the quality forwireless connections 104 provides an indicating device, evaluate the quality of each servicewireless connections 104 according to this indicating device.Mass indicator is that for example each sends the average mistake bit number in the information block (for example frame), the quantity of thewireless connections 104 of premature interruption, perhaps other known indicators.In transmitted in packets, if for example data transmit in grouping, then mass indicator can for example be a ratio of consulting bit rate and actual bit rate, bit rate, ACK/NACK ratio (the zero defect grouping that promptly receives and the relation between the retransmission packet), perhaps other known indicators.Must emphasize,, use the sort of indicating device unimportant, importantly in the method for described definite channel disturbance threshold value, how use indicating device from angle of the present invention.Each the servicewireless connections 104 that records or the quality of some servicewireless connections 104 are added into statistical form.
Change the interference threshold of 406channels.Network portion 100 is regular, at random or answer the requirement of network element, and according to the interference threshold of following logical renewal channel:
If the mass value of servicewireless connections 104 is low excessively, then reduce the interference threshold of 408 channels.This means and utilize above-mentioned association be associated with the interference threshold of channel, change interference threshold, make it have a lower value according to which mass value in the statistical form of service wireless connections 104.Therefore, improve service the most at last and connect 104 quality.
If the mass value ofservice connection 104 is very good, then increase the interference threshold of 410 channels.Like this, the bit error in the connection increases, and still keeps fully good but connect, because the incorrect bit number is still very low, thereby can carry out error correction.On the other hand, professional quality is improved, because the quantity of thewireless connections 104 of blocking reduces.Interference threshold is frequency shift without basis not.Therefore, certain specific change scope of qualitative factor can be thought rational good quality.As long as quality remains in this scope, just do not need to change interference threshold.Can avoid the unnecessary unsteadiness of system in this way.
In one embodiment, the interference threshold of channel and/or channel quantity threshold value depend on the type of service that transmits in the wireless connections 104.For example, the low interference channel of a free time is enough for speech business.For transmitting the video call that changes picture, what the channel quantity threshold value may be high is many, for example 8.On the other hand, if for example transfer of data is used transmitted in packets, then interference threshold may differ greatly with the employed interference threshold of speech business.
Can adjust interference threshold, make set-up procedure all identical, but the threshold difference of different business equal the C/I goal discrepancy all business.For example, for voice, the C/I value is 15dB, and data are 10dB.Therefore, the interference threshold of voice is-100dBm, and data are-and 105dBm.Need to change the interference threshold of specific transactions now, change other professional interference threshold with identical set-up procedure simultaneously.
In one embodiment, channel carries out the frequency hopping operation.In this case, channel is meant one group of frequency hop sequences, in other words, by changing the time slot in frequency and/or the different frame, transmits same user's data in wireless connections 104.Different frequency hopping types comprise circulation frequency hopping and random frequency hopping.The circulation frequency hopping is constantly carried out along specific short frequency hop sequences.In random frequency hopping, then carry out frequency hopping according to long pseudo random sequence, promptly use different frequency and/or time slot with random order.
In the circulation frequency hopping, frequency hop sequences and channel equivalence are measured in the channel that this sequence comprised and are disturbed.In access control,, then allow new wireless connections if there is the enough good frequency hop sequences of sufficient amount to use.The indicating device of indication credit rating is in for example following one or some: the average interference of sequence, and the maximum interference of sequence, the enough interference of quantity is low sequence channel fully.
In random frequency hopping, determine the interference value of channel in the following manner: the average interference value of the interference value of measured channel collection and definite this channel.Channel set is meant some particular channel or all channels.In access control, if average interference is fully low, and the transmitter-receiver that requirement is arranged in the base station then allows new wireless connections to available.Therefore, do not use the channel quantity threshold value in this case, because all channels all have identical average interference.
To those skilled in the art, obviously the execution order of institute's method steps can change to some extent, and for example thestep 300 of Fig. 3 and 302 almost can be carried out in any stage.
Cellular radio network scheme according to institute's describing method is easy to realize.Only need carry out less relatively change to network portion 100.Network portion 100
Determine the interference threshold of channel,
The allocated channel amount threshold,
Measure the interference value of at least one idle channel,
The idle channel interference value that relatively records and the interference threshold of channel determine whether this channel is available.
When selecting at least one and be lower than the idle channel of interference threshold and distribute to newwireless connections 104, determine whether the idle channel quantity that is lower than interference threshold surpasses this channel quantity threshold value, perhaps when blocking new wireless connections, determine whether the idle channel quantity that is lower than interference threshold is less than this channel quantity threshold value.
Which mass value of determining servicewireless connections 104 with which interference threshold of channel is associated,
The mass value of monitoring and thewireless connections 104 that addingnetwork portion 100 is served in statistical form,
Change the interference threshold of channel:
If the mass value of servicewireless connections 104 is low excessively, then reduce the interference threshold of channel,
If the mass value of servicewireless connections 104 is very good, then increase the interference threshold of channel.
In one embodiment,network portion 100 is determined the interference threshold and/or the channel quantity threshold value of channel according to the quality of service that transmits in thewireless connections 104.
In one embodiment,network portion 100 comprises and can circulate or the frequency hopping element 214 of random frequency hopping.Under latter event, the interference value ofnetwork portion 100 measured channel collection, the average interference value of generation channel.
Investigate Fig. 2, wherein described innetwork portion 100, how to realize necessary processing by example.This network portion comprises base station 210, base station controller 200, mobile services switching centre 220, and network management system 220.Mobile services switching centre 220 is communicated by letter with base station controller 200.Base station controller 200 is communicated by letter with base station 210.Base station controller 200 comprises a flock-mate switching network 202, code converter 204 and control unit 206.Flock-mate switching network 202 is used for switched voice and data, and connects signaling circuit.The code converter 204 conversion public telephone networks different phonetic coding pattern used with mobile network makes it compatible each other.Control unit 206 is called out control, mobile management, collection of statistical data and signaling.Base station 210 comprises frame unit 212, frequency hopping unit 214, carrier wave unit 216 and antenna 218.Carry out chnnel coding in frame unit 212, channel interleaving, data encryption and pulse pass and generate.In frequency hopping unit 214, carry out possible frequency hopping to baseband carrier.In carrier wave unit 216, send the modulation and the analog-to-digital conversion of signal.Can use by network management system 230, control and safeguard the different operating of cellular radio network.The network operator adjusts the different parameters of cellular radio network by network management system 230, thereby controls its operation.The major function of mobile services switching centre 220 is to call out control.
Base station controller 220 request base stations 210 send calling 104 touser terminal 102 and set up message, thereby connect with user terminal 102.User terminal 102 is tackled mutually and is called out 104 and set up message and respond.Realize that the simplest method of the present invention is to convertnetwork portion 100 required operations to software.Then software is installed in the memory of base station controller 200 control assemblies 206 for example.The network operator changes necessary parameter by network management system 230, and network management system 230 is for example communicated by letter with base station controller 210 by mobile services switching centre 220.On the other hand, this scheme also can be passed through ordinary processor or signal processor, perhaps passes through independently logic realization.Also can not depart from spirit of the present invention, carry out division of operations between base station controller 200 and the base station 210 in other certain mode.Any other parts ofnetwork portion 100, for example mobile services switching centre 220 also can be carried out operation required for the present invention according to aforementioned principle.
Although abovely described the present invention at the example according to accompanying drawing, obviously the present invention is not limited thereto, can improve in several ways in the disclosed innovative idea scope of appended claim book.
Claims (14)
1. a kind of connection control method in the interference-limited cellular radio network, this cellular radio network comprises network portion (100), double-direction radio between at least one user terminal (102) and network portion (100) and the user terminal (102) connects (104), these wireless connections (104) on a channel, are carried out in network portion (100) at least
Determine the interference threshold of (300) channel,
Measure the interference value of (304) at least one idle channel,
The idle channel interference value that comparison (318) records and the interference threshold of channel determine that this channel can still be unavailable (320) with (322),
It is characterized in that this method may further comprise the steps:
Specify (302) channel quantity threshold value,
Select (312) at least one when being lower than the idle channel of interference threshold and distributing (314) to give new wireless connections, determine that whether (308) are lower than the idle channel quantity of interference threshold above this channel quantity threshold value, perhaps when blocking (316) new wireless connections (104), determine whether the idle channel quantity that is lower than interference threshold is less than this channel quantity threshold value.
2. according to the method for claim 1, it is characterized in that determine (300) of channel disturbance threshold value may further comprise the steps:
Which mass value of determining service wireless connections (104) with which interference threshold (400) of channel is associated,
The mass value of monitoring (402) and the wireless connections (104) of adding Network Dept. branch service in statistical form (404),
Change the interference threshold of (406) channel:
If the mass value of service wireless connections (104) is low excessively, then reduce the interference threshold of (408) channel,
If the mass value of service wireless connections (104) is very good, then increase the interference threshold of (410) channel.
3. according to the method for arbitrary aforementioned claim, it is characterized in that the interference threshold of channel depends on the quality of service that transmits in the wireless connections (104).
4. according to the method for arbitrary aforementioned claim, it is characterized in that the channel quantity threshold value depends on the quality of service that transmits in the wireless connections (104).
5. according to the method for arbitrary aforementioned claim, it is characterized in that channel carries out frequency hopping.
6. according to the method for arbitrary aforementioned claim, it is characterized in that, in the circulation frequency hopping, frequency hop sequences and channel equivalence.
7. according to method any in the aforementioned claim 1 to 5, it is characterized in that in random frequency hopping, the channel disturbance value is following to be determined: the interference value of measured channel collection, and the average interference value of definite channel.
8. interference-limited cellular radio network, this cellular radio network comprises network portion (100), double-direction radio between at least one user terminal (102) and network portion (100) and the user terminal (102) connects (104), these wireless connections (104) at least one channel, network portion (100)
Determine the interference threshold of channel,
Measure the interference value of at least one idle channel,
The channel disturbance value that relatively records and the interference threshold of channel, determine this channel can with or unavailable,
It is characterized in that this network portion (100)
The allocated channel amount threshold,
When selecting at least one and be lower than the idle channel of interference threshold and distribute to new wireless connections (104), determine whether the idle channel quantity that is lower than interference threshold surpasses this channel quantity threshold value, perhaps when blocking new wireless connections (104), determine whether the idle channel quantity that is lower than interference threshold is less than this channel quantity threshold value.
9. system according to Claim 8 is characterized in that, network portion (100) is determined channel disturbance threshold value, wherein network portion
Which mass value of determining service wireless connections (104) with which interference threshold of channel is associated,
Monitoring also adds the mass value of the wireless connections (104) that network portion (100) served in statistical form,
Change the interference threshold of channel:
If the mass value of service wireless connections (104) is low excessively, then reduce the interference threshold of channel,
If the mass value of service wireless connections (104) is very good, then increase the interference threshold of channel.
10. according to system any in the aforementioned claim 8 to 9, it is characterized in that network portion (100) is determined the interference threshold of channel according to the quality of service that transmits in the wireless connections (104).
11. the system according to any in the aforementioned claim 8 to 10 is characterized in that, network portion (100) is determined the channel quantity threshold value according to the quality of service that transmits in the wireless connections (104).
12. the system according to any in the aforementioned claim 8 to 11 is characterized in that, network portion (100) comprises frequency hopping unit (214).
13. the system according to any in the aforementioned claim 8 to 12 is characterized in that, network portion (100) comprises provides the frequency hopping of circulation frequency hopping unit (214).
14. the system according to any in the aforementioned claim 8 to 12 is characterized in that, network portion (100) comprises provides the frequency hopping of random frequency hopping unit (214), the interference value of network portion (100) measured channel collection, and the average interference value of definite channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97180791.4ACN1240563A (en) | 1996-12-19 | 1997-12-18 | Method for admission control in interference-limited cellular radio network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI965130 | 1996-12-19 | ||
| CN97180791.4ACN1240563A (en) | 1996-12-19 | 1997-12-18 | Method for admission control in interference-limited cellular radio network |
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| CN1240563Atrue CN1240563A (en) | 2000-01-05 |
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| CN97180791.4APendingCN1240563A (en) | 1996-12-19 | 1997-12-18 | Method for admission control in interference-limited cellular radio network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305339C (en)* | 2001-11-30 | 2007-03-14 | 艾利森电话股份有限公司 | Interference measurement in wireless communication system |
| WO2010054605A1 (en)* | 2008-11-17 | 2010-05-20 | Huawei Technologies Co., Ltd. | System and method for managing a wireless communications network |
| CN101335994B (en)* | 2007-06-29 | 2012-01-04 | 株式会社日立制作所 | Status notifying method in radio communication |
| CN101047995B (en)* | 2006-06-16 | 2012-04-04 | 华为技术有限公司 | Channel switching method and self-adaption method of interference detection threshold |
| CN111246399A (en)* | 2020-02-18 | 2020-06-05 | Oppo（重庆）智能科技有限公司 | Method for discovering Bluetooth device and related product |
- 1997
- 1997-12-18CNCN97180791.4Apatent/CN1240563A/enactivePending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305339C (en)* | 2001-11-30 | 2007-03-14 | 艾利森电话股份有限公司 | Interference measurement in wireless communication system |
| CN101047995B (en)* | 2006-06-16 | 2012-04-04 | 华为技术有限公司 | Channel switching method and self-adaption method of interference detection threshold |
| CN101335994B (en)* | 2007-06-29 | 2012-01-04 | 株式会社日立制作所 | Status notifying method in radio communication |
| WO2010054605A1 (en)* | 2008-11-17 | 2010-05-20 | Huawei Technologies Co., Ltd. | System and method for managing a wireless communications network |
| CN111246399A (en)* | 2020-02-18 | 2020-06-05 | Oppo（重庆）智能科技有限公司 | Method for discovering Bluetooth device and related product |
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