CN108540254A - Small region search method based on low-and high-frequency mixed networking - Google Patents
Small region search method based on low-and high-frequency mixed networking Download PDFInfo
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- CN108540254A CN108540254A CN201810366904.4A CN201810366904A CN108540254A CN 108540254 A CN108540254 A CN 108540254A CN 201810366904 A CN201810366904 A CN 201810366904A CN 108540254 A CN108540254 A CN 108540254A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to wireless communication technology field, specifically a kind of small region search method based on low-and high-frequency mixed networking.The present invention is to solve millimeter-wave communication system loss greatly, the problems such as transmission environment is harsh, in order to ensure that coverage area, 5G networks combine millimeter wave cell and existing microwave cell, pass through double-strand connection technology, so that realizing cooperation with service between 5G and 4GLTE systems, it ensures that most users can be always maintained at connection, while can significantly promote user throughput, and avoid frequent switching, thus, it is proposed that the millimeter wave small region search method based on heterogeneous network.Location information has been reported to base station by UE, position and the distance at the ends UE has been obtained in base station end, carries out carrying out beam search in more accurately initial range.In user terminal, reduction receives beam search number, saves user's energy consumption.By this method, reduce the energy consumption of search, also improve the performance of cell searching.
Description
Technical field
The invention belongs to wireless communication technology fields, are related to millimetre-wave attenuator (Millimeter-Wave (mmWave)
Communication), beam selection technique and multiple-input and multiple-output (Multiple Input Multiple Output,
MIMO) technology, specifically the millimeter wave small region search method based on heterogeneous network.
Background technology
With the development of wireless communication, millimeter wave (Millimeter wave (mmWave)) is considered next-generation wireless
One of core technology candidate of the communication technology, it can greatly widen usable spectrum resource, however, with traditional microwave frequency phase
Than the key challenge using millimeter wave frequency band is its serious signal propagation losses.In order to compensate for such loss, may be used
Large-scale antenna array realizes high power gain.
In the past, millimeter wave all used in point-to-point Radio Link, was the important composition of current mobile network's passback technology.
For 5G, main target is exactly that millimeter wave is used to the access part of network, is that terminal user expands in this way
Channel capacity simultaneously significantly improves available data rate.However this target also brings propagation spy severe under high band simultaneously
Property and the limited equal technological challenges of antenna element available power.
With the high speed development of the communication technology and mobile Internet, demand of the user to high speed data transfer is growing day by day,
This makes educational circles that sight is turned to mmW frequency ranges to meet next generation communication system high-speed, low time delay, the demand of more multi-link.
Millimeter-wave communication system is accompanied by loss greatly while bringing the series of advantages such as abundant frequency spectrum resource, and transmission environment is harsh
The shortcomings of, ensure coverage area just at a great problem of deployment 5G networks：If using omnidirectional antenna, which has
Imitating coverage area can be very limited, to cause the communication range of millimeter-wave communication system also extremely limited.Deployment height orients
Aerial array can be used for optimizing link budget and extend the coverage area of millimeter wave SC.In addition to increase antenna gain it
Outside, interfering with each other between sending and receiving end can also greatly reduce antenna using the antenna of high orientation.Other field
Some solutions for being directed to directional cell search, such as ad hoc networks and personal area network are proposed, but these are solved
Certainly scheme for future 5G millimeter wave network demands all without providing suitable scheme.
Simplest cell searching strategy is exactly to traverse all beam angles and angle direction until base station and UE successes
It is synchronous.However, this method can consume the unnecessary time, synchronizing process can also bear high time delay.In fact, for current
Antenna technology, many different antenna configurations are likely to complete the process of cell searching：The different waves that can be selected first
Beam width has very much, secondly, also has much for the different directions of antenna alignment.
Beam angle has a significant impact for search process, and larger width allows wave beam quickly to scan peripheral region
Domain, that is to say, that switching different beams width number is less, but this wave beam can only scan the UE of relative proximity distance.It is on the contrary
As the same, relatively narrow wave beam can be scanned apart from farther UE, but needing to switch antenna configuration in large quantities has time to scan
Between.So, search process just necessarily bears the performance compromise of sweep speed and scanning distance.Obviously, if be optimal
Performance depends on the distribution of workable antenna configuration and UE.
In the ideal situation, it is assumed that be capable of providing accurate CI, base station and UE directly can be directed at that using narrow beam
This.And inevitably some errors in practical applications, along with CI can only be used for reducing the model in space to be searched
It encloses, it is therefore desirable to design searching algorithm to find most possible antenna configuration.
Invention content
The purpose of the present invention, in order to avoid the too small disadvantage of millimeter wave base station range, it is proposed that mixed based on low-and high-frequency
It is combined the small region search method of net.
Technical scheme is as follows：
Small region search method based on low-and high-frequency mixed networking, which is characterized in that include the following steps：
S1, heterogeneous network is constituted using the base stations 4G for being operated in microwave frequency band and the base stations 5G for being operated in millimeter wave frequency band,
Wherein, transmission control face data is responsible in the base stations 4G, and 5G is responsible for base station transmitting user face data；
S2, the geographical location information for reaching user is obtained by the base stations 4G：
The base station S3,5G obtains reaching the geographical location information of user and calculate required according to the control plane of the base stations 4G
Beam angle and pointing direction, to emit synchronizing signal covering user.
Further, which is characterized in that the specific method of the step S1 is：
5G base station deployments are connected within the coverage area of the base stations 4G, and by MC eNB with core net, MC eNB controls
The control plane information transmission of all UE in cell range；The UE being in 4G base station ranges can be from MC eNB and SC
ENB receives user face data, and only receives control plane signal from MC eNB.
Further, the specific method of the step S2 is：
User reports CI information to core net, the position and user based on CI acquisition of information users positioning and millimeter wave
The distance of base station.
Further, the specific method of the step S3 is：
The customer position information that the base station S31,5G is obtained according to step S2 calculates required beam angle and pointing direction
Rear line direction emits synchronizing signal；
If whether received signal power value is less than threshold value at S32, judgement user, if so, thinking that user is not searched
Rope arrives, and enters step S33；If it is not, then detecting user, terminate search process；
S33, by the both sides neighboring community domain of the zonule of current launching beam, with current beam angle, clockwise
It searches for user across counterclockwise, successively such iteration, is detected one time until by all zonules；If detecting user,
Terminate search process；If still not searching user, reduce beam angle, repeated the above process using thinner wave beam,
Until detecting that user stays search process；Or terminate search after all beam angle combinations of traversal, and be by user's mark
It can not network.
In the solution of the present invention, the structure of the control plane based on heterogeneous network/user plane separation helps to solve deployment milli
Some problems encountered when metric wave cell base station, such as area coverage, link, QoS demand etc..By by all control plane signals
It is transmitted in MC eNB with the user face data to delay sensitive, the QoS demand of network connection and delay sensitive Business Stream can obtain
To guarantee.Meanwhile the signaling traffic load of core net is also included in this configuration.For example, directly being controlled in UE and MC eNB
In the case of face connection processed, UE will not trigger handoff procedure by the movement of MC at core net.In this way, between the base stations SC frequently
Switching would not lead to signaling traffic load high at core net.
The beneficial effects of the invention are as follows：
CI information is reported to core net by UE, position and the distance of UE positioning is obtained, has effectively evaded millimeter-wave systems
The blindness of beam search, and may therefore caused by higher evaluated error probability.
Using adaptive algorithm, according to the distance of UE and base station, it is determined that the beam angle used, for search performance
There is significant enhancing.
Description of the drawings
Fig. 1 is NSA structure charts；
Fig. 2 is the position relationship and beam pattern after known position information between millimeter wave base station and user；
Fig. 3 is exhaust algorithm schematic diagram；
Fig. 4 be millimeter wave cell can search for region and actually can support area mismatch problem.
Specific implementation mode
Technical scheme of the present invention is explained in further detail with reference to the accompanying drawings and examples.
The solution of the present invention is applied in NSA structural systems as shown in Figure 1, millimeter wave base station is synchronous with microwave base station
Cooperation ensure that the seamless link of UE.It is responsible for the transmission of the control planes information such as synchronizing signal using the MC of traditional 3G-4G technologies,
And millimeter wave SC is responsible for increasing capacity.By using different Radio Transmission Technologys, different coverage areas has been spliced to one
It rises, and can switch between the network elements.5G access network will based on isomerism network structure, in these structures,
Continuous connection can throughout be provided by using the technology organized in MC, at the same MC coverings under dispose it is a large amount of
SCs, to provide additional capacity.In this way, by reducing the distance between UE and access base station, and balance between SC and MC
Flow, so that it may to significantly improve the user rate of small base station (SCs).SC base station deployments within the coverage area of the base stations MC, and
And it is connected with core net by MC eNB.MC eNB control the control plane information transmission of all UE in cell range.Those
The UE being in MC base station ranges can receive user face data from MC eNB and SC eNB, and only receive control from MC eNB
Face signal processed.
The structure of this control plane based on heterogeneous network/user plane separation helps to solve deployment millimeter wave cell base station
When some problems for encountering, such as area coverage, link, QoS demand etc..By by all control plane signals and to delay sensitive
User face data transmitted in MC eNB, the QoS demand of network connection and delay sensitive Business Stream can be guaranteed.Meanwhile
The signaling traffic load of core net is also included in this configuration.For example, directly controlling the feelings that face connects in UE with MC eNB
Under condition, UE will not trigger handoff procedure by the movement of MC at core net.In this way, frequently switching would not between the base stations SC
Lead to signaling traffic load high at core net.
For in LTE system cell searching with it is synchronous for, eNB pass through Physical Downlink Control Channel (PDCCH) broadcast
Cell special reference (CRS).UE calculates Reference Signal Received Power (RSRP) after receiving reference signal.CRS is whole
Theaomni-directional transmission in a cell coverage area.Once the link establishment between eNB and UE is got up, so that it may with use wave beam forming or
Other advanced transmit-receive technologies enhance the capacity of link.
For millimeter-wave systems, if also taking identical cell searching technology, due to the high path loss of millimeter wave frequency band
Characteristic, the method for omni-direction transmissions and undesirable is used for general UE and base station distance.Millimeter wave base station is in omnidirectional
It is practical to support clothes due to antenna gain when may only be searched when transmission apart from oneself close UE, and use directional aerial
Business produces apart from far UE and can search for region and the practical mismatch problem for supporting coverage.In such case
Under, in order to ensure enough area coverages, the base stations millimeter wave SC should be denser than actual needs, this will cause frequency spectrum to provide
Source wastes, the shortcomings of efficiency is low, and lower deployment cost is high, and Fig. 4 shows millimeter-wave systems and can search for region and actually can coverage
Mismatch problem.Scheme through the invention can help to solve the problems, such as that this is unmatched.
In order to facilitate narration, by taking this Fig. 2 as an example, scBS is the position that millimeter wave base station is installed in cell, MSNPIt is UE to core
The position that the heart is reported on the net is inaccurate due to being influenced by inevitable position error.The actual position of UE is denoted as MSRP。
D is based on CI information to the distance between the positions positioned UE and millimeter wave base station, NPAFor the position error of the positions UE.When new
User enters cell, the synchronizing signal that it emits search base station.From one it is extreme for, it is assumed that the location information of new user is complete
It is complete unknown.Such words base station randomly chooses a beam angle and then direction starts possible user around detection.Once
The power for receiving signal is higher than minimum detection threshold value, and user starts with regard to reporting channel information, synchronizing process.Clearly as user
The randomness of position, it is very long that this searching method may result in search time.In addition, shadow of the user distribution to search time
Sound is also very big, because user distance is remoter, wave beam must be narrower, needs the direction detected more in this way.
Consider another extreme case, it is assumed that accurate UE geographical location information can be obtained, such base station is easy to calculate
Go out suitable beam angle and deflection, user is covered to provide the signal of enough power.This method natural energy obtains most
Excellent cell search time.
And the truth in actual scene is often located between these two extremes.To propose the model of Fig. 3, isomery
Significant advantage known to user's geographical location information is utilized in cell search process under network model.It is searched for as completely random
The improvement for the first time of algorithm, set forth herein DGS algorithms.Current millimeter wave SC obtains reaching the geographical position of user by the control plane of MC
Confidence ceases and calculates required beam angle and pointing direction to cover user.The area coverage of millimeter wave cell is divided into
N number of zonule, N=2 π/W-3dB.If due to site error, user is not detected, and millimeter wave base station just uses identical
All directions around beam angle scanning, if still arriving user without scanning, millimeter wave base station is reduced by beam angle,
More directions are scanned successively.After all antenna configurations (beam angle, antenna are directed toward) are all scanned, if not having still
Scanning result, the UE are regarded as not linking.
Based on the small region search method of low-and high-frequency mixed networking, the process employs the think ofs that user plane and control panel detach
Think, transmission control face data is responsible in the base stations 4G for being operated in microwave frequency band, and user face data is by being operated in millimeter wave frequency band
It is responsible for the base stations 5G, which is characterized in that include the following steps：
S1, the geographical location information for reaching user is obtained：UE reports CI information to core net, can be obtained based on CI information
The distance of the position and it and millimeter wave base station of UE positioning.
S2, transmitting synchronizing signal：Millimeter wave base station emits synchronizing signal in the hope of covering user to user direction.If at user
Received signal power value then thinks that user is not searched less than threshold value, in this way, base station will be in the small of current launching beam
User is searched in the both sides neighboring community domain in region across clockwise and anticlockwise with current beam angle, successively so repeatedly
In generation, detects one time until by all zonules.If still not searching user, then being reduced by beam angle, use is thinner
Wave beam repeat the above process.When UE is finally detected, or attempted still to fail to search for after all beam angles combinations
To UE, search process just stops, and the UE under latter instance can be marked as networking.
Claims (4)
1. the small region search method based on low-and high-frequency mixed networking, which is characterized in that include the following steps：
S1, heterogeneous network is constituted using the base stations 4G for being operated in microwave frequency band and the base stations 5G for being operated in millimeter wave frequency band, wherein
4G is responsible for base station transmission control face data, and 5G is responsible for base station transmitting user face data；
S2, the geographical location information for reaching user is obtained by the base stations 4G：
The base station S3,5G obtains reaching the geographical location information of user and calculates required wave beam according to the control plane of the base stations 4G
Width and pointing direction, to emit synchronizing signal covering user.
2. the small region search method according to claim 1 based on low-and high-frequency mixed networking, which is characterized in that the step
The specific method of S1 is：
5G base station deployments are connected within the coverage area of the base stations 4G, and by MC eNB with core net, and MC eNB control small
The control plane information transmission of all UE within the scope of area；The UE being in 4G base station ranges can connect from MC eNB and SC eNB
User face data is received, and only receives control plane signal from MC eNB.
3. the small region search method according to claim 2 based on low-and high-frequency mixed networking, which is characterized in that the step
The specific method of S2 is：
User reports CI information to core net, the position and user based on CI acquisition of information users positioning and millimeter wave base station
Distance.
4. the small region search method according to claim 3 based on low-and high-frequency mixed networking, which is characterized in that the step
The specific method of S3 is：
The customer position information that the base station S31,5G is obtained according to step S2, calculates required beam angle and pointing direction is backward
User direction emits synchronizing signal；
If whether received signal power value is less than threshold value at S32, judgement user, if so, think that user is not searched,
Enter step S33；If it is not, then detecting user, terminate search process；
S33, by the both sides neighboring community domain of the zonule of current launching beam, it is clockwise and inverse with current beam angle
Hour hands search for user across, successively such iteration, are detected one time until by all zonules；If detecting user, terminate
Search process；If still not searching user, reduce beam angle, is repeated the above process using thinner wave beam, until
Detect that user stays search process；Or terminate search after all beam angle combinations of traversal, and being by user's mark can not
Networking.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020077486A1 (en) * | 2018-10-15 | 2020-04-23 | 华为技术有限公司 | Cell selection method and terminal device |
| CN111520189A (en) * | 2020-04-24 | 2020-08-11 | 电子科技大学 | Real-time monitoring system and method for coal mine super-layer boundary-crossing mining problem |
| CN111740791A (en) * | 2020-06-30 | 2020-10-02 | 展讯通信（上海）有限公司 | Communication control method, communication control device, communication equipment and storage medium |
| CN112135304A (en) * | 2019-06-25 | 2020-12-25 | 中兴通讯股份有限公司 | Beam management method and device based on non-independent networking NSA system |
| CN113412647A (en) * | 2019-09-18 | 2021-09-17 | 华为技术有限公司 | Access control method and device |
| CN113727397A (en) * | 2021-08-25 | 2021-11-30 | 深圳国人无线通信有限公司 | Method for cooperative communication of high-low frequency network system |
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| CN113727397A (en) * | 2021-08-25 | 2021-11-30 | 深圳国人无线通信有限公司 | Method for cooperative communication of high-low frequency network system |
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