CN108540254B - 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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- CN108540254B CN108540254B CN201810366904.4A CN201810366904A CN108540254B CN 108540254 B CN108540254 B CN 108540254B CN 201810366904 A CN201810366904 A CN 201810366904A CN 108540254 B CN108540254 B CN 108540254B
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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 guarantee coverage area, 5G network combines millimeter wave cell and existing microwave cell, passes through double-strand connection technology, so that realizing cooperation with service between 5G and 4GLTE system, it ensures that most users can be always maintained at connection, while can significantly promote user throughput, and avoid frequent switching, the millimeter wave small region search method based on heterogeneous network is proposed as a result,.Location information has been reported to base station by UE, has obtained position and the distance at the end UE in base station end, has carried out carrying out beam search in more accurate 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 technique
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, can use
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 expanded in this way for terminal user
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 range 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 disadvantages of, guarantee coverage area just at a great problem of deployment 5G network: 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 orientation
Aerial array can be used to optimize link budget and extend the coverage area of millimeter wave SC.In addition to increase antenna gain it
Outside, interfering with each other between antenna can also be greatly reduced using the antenna of high orientation in sending and receiving end.Other field
Some solutions for directional cell search, such as ad hoc network and personal area network are proposed, but these are solved
Certainly scheme is all without providing suitable scheme for future 5G millimeter wave network demand.
Simplest cell searching strategy is exactly to traverse all beam angle and angle direction until base station and UE success
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 choose first
Beam width has very much, secondly, the different directions for antenna alignment also have very much.
Beam angle has a significant impact for search process, and biggish 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
, relatively narrow wave beam can be scanned apart from farther UE, but needed to switch antenna configuration in large quantities and be had time to scan
Between.So, search process just necessarily bears the performance compromise of scanning speed and scanning distance.Obviously, if be optimal
Performance, the distribution depending on 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 to reduce the model in space to be searched
It encloses, it is therefore desirable to design searching algorithm to find most possible antenna configuration.
Summary of the invention
The purpose of the present invention proposes mixed based on low-and high-frequency in order to avoid the too small disadvantage of millimeter wave base station range
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 comprises the following steps:
S1, heterogeneous network is constituted in the base station 5G of millimeter wave frequency band in the base station 4G of microwave frequency band and work using work,
Wherein, transmission control face data is responsible in the base station 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 station 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 station 4G
Beam angle and pointing direction, to emit synchronization signal to cover user.
Further, which is characterized in that the step S1's method particularly includes:
5G base station deployment is connected within the coverage area of the base station 4G, and through MC eNB with core net, MC eNB control
The control plane information transmission of all UE in cell range；The UE being in 4G base station range can be from MC eNB and SC
ENB receives user face data, and only receives control plane signal from MC eNB.
Further, the step S2 method particularly includes:
User reports CI information to core net, position and user and millimeter wave based on CI acquisition of information user positioning
The distance of base station.
Further, the step S3 method particularly includes:
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 synchronization 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 two 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 control plane based on heterogeneous network/user face separation structure helps to solve deployment milli
The 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 with the user face data to delay sensitive in MC eNB, 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 where face connection processed, UE will not trigger handoff procedure by the movement of MC at core net.In this way, between the base station SC frequently
Switching would not lead to signaling traffic load high at core net.
The beneficial effects of the present invention are:
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.
Detailed description of the invention
Fig. 1 is NSA structure chart；
Fig. 2 is the positional 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 embodiment
Technical solution 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 system 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 synchronization signal using the MC of traditional 3G-4G technology,
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 covering 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 significantly improve the user rate of small base station (SCs).SC base station deployment within the coverage area of the base station MC, and
And it is connected by MC eNB with core net.MC eNB controls the control plane information transmission of all UE in cell range.Those
The UE being in MC base station range can receive user face data from MC eNB and SC eNB, and only receive and control from MC eNB
Face signal processed.
This control plane based on heterogeneous network/user face separation structure 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, network connection and the QoS demand of 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 station SC
Lead to signaling traffic load high at core net.
For the cell searching in LTE system for synchronous, eNB is broadcasted by Physical Downlink Control Channel (PDCCH)
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 using 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 guarantee enough area coverages, the base station millimeter wave SC should be denser than actually required, this will will lead to frequency spectrum money
Source waste, the disadvantages of efficiency is low, and lower deployment cost is high, Fig. 4, which shows millimeter-wave systems, 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 position positioned UE and millimeter wave base station, NPAFor the position error of the position UE.When new
User enters cell, the synchronization 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, and the direction for needing to detect in this way is more.
Consider another extreme case, it is assumed that accurate UE geographical location information can be obtained, such base station is easy to calculate
Suitable beam angle and deflection out cover user 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 user is not detected due to location error, 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,
Successively scan more directions.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 face and control panel separate
Think, work is responsible for transmission control face data in the base station 4G of microwave frequency band, and user face data is by working in millimeter wave frequency band
It is responsible for the base station 5G, which comprises the following steps:
S1, obtain the geographical location information for reaching user: UE reports CI information to core net, available based on CI information
The position of UE positioning and the distance of it and millimeter wave base station.
S2, transmitting synchronization signal: millimeter wave base station emits synchronization signal to user direction in the hope of covering user.If at user
Received signal power value is less than threshold value and then thinks that user is not searched, in this way, base station will be in the small of current launching beam
User is searched for current beam angle in the two sides neighboring community domain in region across clockwise and anticlockwise, 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 (1)
1. the small region search method based on low-and high-frequency mixed networking, which comprises the following steps:
S1, heterogeneous network is constituted in the base station 5G of millimeter wave frequency band in the base station 4G of microwave frequency band and work using work, wherein
4G is responsible for base station transmission control face data, and 5G is responsible for base station transmitting user face data；Method particularly includes:
5G base station deployment is connected within the coverage area of the base station 4G, and through microwave base station MC eNB with core net, MC eNB
Control the control plane information transmission of all UE in cell range；It is in 4G base station range, and by 5G base station search
The UE arrived can receive user face data from MC eNB and millimeter wave base station SC eNB, and only receive control plane letter from MC eNB
Number；
S2, the geographical location information for reaching user is obtained by the base station 4G:
User identifies CI information to core net reporting subdistrict, position and user and milli based on CI acquisition of information user positioning
The distance of metric wave base station；
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 station 4G
Width and pointing direction, to emit synchronization signal to cover user；Method particularly includes:
It is backward to calculate required beam angle and pointing direction for the customer position information that the base station S31,5G is obtained according to step S2
User direction emits synchronization signal；
S32, judge whether received signal power value is less than threshold value at user, if so, think that user is not searched, into
Enter step S33；If it is not, then detecting user, terminate search process；
S33, by the two 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, detect 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 terminates 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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| CN115379517A (en) * | 2018-10-15 | 2022-11-22 | 华为技术有限公司 | Method for selecting cell and terminal equipment |
| 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 |
| WO2021051326A1 (en) * | 2019-09-18 | 2021-03-25 | 华为技术有限公司 | Access control method and device |
| CN111520189B (en) * | 2020-04-24 | 2021-06-01 | 电子科技大学 | Real-time monitoring system and method for coal mine super-layer boundary-crossing mining problem |
| CN111740791B (en) * | 2020-06-30 | 2022-06-10 | 展讯通信（上海）有限公司 | Communication control method, communication control device, communication equipment and storage medium |
| 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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| US20130321225A1 (en) * | 2012-06-01 | 2013-12-05 | Vubiq Incorporated | Automatic antenna pointing and stabilization and method thereof |
| KR102056411B1 (en) * | 2014-02-28 | 2019-12-16 | 삼성전자주식회사 | Method and apparatus for beam coverage expansion in wireless communication system |
| BR112017022109A2 (en) * | 2015-04-24 | 2018-07-03 | Mediatek Inc | on-demand reconfigurable control plan architecture (orca) integrating small millimeter wave cell and microwave macrocell |
| CN106533557B (en) * | 2016-10-28 | 2018-08-31 | 陕西尚品信息科技有限公司 | A method of millimetre-wave attenuator energy loss is reduced based on beam-forming technology |
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