CN106535231A - Content delivery method based on Cache deployment oriented to 5G (5th generation) user-centered network - Google Patents
Content delivery method based on Cache deployment oriented to 5G (5th generation) user-centered network Download PDFInfo
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- CN106535231A CN106535231A CN201611123639.4A CN201611123639A CN106535231A CN 106535231 A CN106535231 A CN 106535231A CN 201611123639 A CN201611123639 A CN 201611123639A CN 106535231 A CN106535231 A CN 106535231A
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- user
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- base station
- content
- macro base
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/17—Selecting a data network PoA [Point of Attachment]
Abstract
The embodiment of the invention provides a content delivery device and method based on Cache deployment oriented to a 5G (5th generation) user-centered network. The content delivery device provided by the invention is arranged in a BS (Base Station) of transmission points, and a plurality of BSs are covered by a macro base station. The method comprises the following steps that: the device receives a request of a user, and checks whether content needed by the user exists in Cache of the BS or not; if the content needed by the user exists in the BS and a channel condition meets a requirement, the BS transmits the content to the user; the user request is forwarded to a synchronization site in a transmission point set if the content needed by the user is not found in the Cache, and the user request is forwarded to the macro base station if the content is not found in the synchronization site; and the macro base station finds the content in the Cache, the user request is forwarded to transmission points managed by the macro base station if the content is not found, the macro base station acquires data from a server through a core network if the content needed by the user does not exist in the transmission points, and finally the content is transmitted to the user by the macro base station or a service site according to a channel state. Through adoption of the content delivery method, the probability in locally finding the content needed by the user is increased. Through adoption of the content delivery device and method in the embodiment of the invention, the repeated request of the same content from the server through the core network is reduced by inter-site cooperation in the 5G user-centered network.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to the 5th Generation Mobile Communication System (the 5th
Generation, referred to as 5G) under super-intensive networking scene in customer-centric network Cache deployment research.
Background technology
The fast development of mobile Internet and intelligent terminal brings the explosive growth of mobile data services, data traffic
Exponential growth is presented.These changes have caused discussion of the industry to the 5th generation (5G) mobile communication.Following network will be faced
Huge challenge, these challenges are including bigger capacity, lower time delay etc..And super-intensive network (ultra-dense
Network, referred to as UDN) it is one of key technology of the 5th generation (5G) mobile communication.Miniaturization base station (small cell)
Dense deployment can improve covering, while increase the transfer rate of data service, so as to adapt to 1000 times of following 5G mobile communication
Data traffic needs.
But the problems such as dense deployment of website can bring interference, backhaul to dispose.To solve interference problem, network is lifted
One of efficiency, important directions of 5G mobile communication researchs are exactly the network for building user-center.The network of user-center leads to
Cross and realize that network follows user to move for the dynamic cooperation transmission point set of user's structure, provide the user high-quality clothes all the time
Business.Transfer point (Transmission point, referred to as TP) in transmission point set is divided into two classes according to function, and a class is clothes
Business TP, a class is synchronous TP.Service TP is current TP for Terminal for service；And synchronization TP is potentially to service TP,
But carry out resource reservation and data have prepared, can be the TP of Terminal for service at any time.
From the business perspective, the fast development of mobile flow medium is put forward higher requirement to bandwidth and time delay.But
It is limited to the preferable backhaul deployment that deployment conditions are difficult to all -fiber in super-intensive networking, and non-ideal backhaul
Being deployed in bandwidth and time delay can all affect the service quality of mobile flow medium service.Additionally, the temperature Ye You area of different content
Not, which shows as being that user often concentrates demand identical content in certain time period.And core net is repeatedly to station transmission phase
The pressure of backhaul can be also increased with content.The transmission of redundant data to solve the above problems, is reduced, is disposed on TP
Cache becomes effective solution.Limited in view of Cache capacity, single-site cannot realize the storage of full content.
Therefore, the feature of site collaboration in the user-center network disposed based on Cache how is utilized, is designed brand-new
Content is searched and transfer mechanism, is asked for identical user content, reduces the data transfer of redundancy between website and core net, drop
Low backhaul pressure and data transmission delay are the key issues for needing to solve.
The content of the invention
Cooperative nature in the main consideration user-center network of Cache deployment of the present invention between website, is embodied in
Network is that, after user builds transmission point set, user can be found in transmission point set, if interior first when a certain content is asked
Hold and exist, then the content is provided the user by the cooperation between website.If content is not present, the scope for expanding request is considered further that.
Further, the present invention builds transmission point set, super-intensive for user in the scene for meeting super-intensive network design
Network is made up of the transfer point of macro base station and dense deployment, and macro base station completes to control management function, and network can be in macro base station and every
Cache is disposed in individual transfer point.Therefore, present invention is generally directed to user-center network is how for needed for user searches and transmits
Content.
The Cache deployment schemes of the present invention are comprised the following steps：
Step 200, transmits the content that the service TP in point set searches user's needs in the Cache of oneself.
Request to a certain content is sent to the service TP in transmission point set by user.TP is in the Cache of itself for service
In search whether to store this content.If the content has been present, the receiving velocity that TP calculates user is serviced.User j's
Receiving velocity Ri,jCalculate as shown in formula (1)：
Wherein, in above-mentioned formula (1), hijRepresent the channel fading between user j and service TP i, gijUser j is represented with clothes
Path loss between business TP i.PiThe transmission power of service TP i is represented, N represents noise power.Q is that TP is constituted with macro base station
Collection of base stations.hkjRepresent the channel fading between user j and site k (remaining website in addition to service TP i), gkjRepresent and use
Path loss between family j and site k, PkRepresent the transmission power of site k.
If user is j receiving velocity Ri,jMore than demand rate T of business, service TP is transmitted for user, otherwise transfer point
User's request content is transmitted to new service TP by set more new demand servicing TP, is transmitted for user by new service TP.
If user's request content cannot be found in service TP, into next step.
Step 210, transmits the synchronous TP in point set and searches whether to store the content that user needs.
Service TP does not store the content that user needs, then the request of user can be transmitted to transmission point set by service TP
Synchronous TP in conjunction.Multiple synchronous TP can search in the Cache of oneself simultaneously in user's request content.If synchronization TP is looked into
The content of user's needs is found, and synchronous transfer rate between TP and user (being calculated by formula (1)) can meet business need
Speed T, then synchronous TP be updated to service TP, be that user directly carries out data transmission；If channel status cannot meet requirement,
The content is given service TP by a link transmission of standing by synchronous TP, is transmitted for user by service TP.If in multiple synchronous TP
The content of user's needs is not found, synchronous TP replys service TP and searches failure, into next step.
The request of user is sent to macro base station by step 220, service TP, and macro base station is searched in the Cache of its own.
Service requests of the TP by user to a certain content is sent to macro base station, and macro base station is looked in the Cache of itself first
Look for, if it is possible to find, and the transfer rate (transfer rate being calculated by formula (1)) between macro base station and user disclosure satisfy that speed
Rate requires that provide the user service by macro base station, otherwise, macro base station transmits the content to service TP, is user by service TP
It is transmitted.If cannot find in macro base station, into next step.
The request of user is sent to other transfer points in the range of its overlay management by step 230, macro base station, these transmission
Point is searched in the Cache of itself.
When macro base station cannot find the content of user's request in the Cache of itself, macro base station is by the request of user
Other transfer points being sent in its range of management, the transfer point for receiving the request are searched in the Cache of itself.If energy
Enough find, by the content transmission to macro base station, according to channel status, service is provided the user by macro base station, or by macro base station
Service TP is transmitted to, service is provided the user by service TP.If the TP in macro base station range of management cannot find user
The content of demand, replys macro base station and searches failure, then into next step.
The request of user is sent to server by core net by step 240, macro base station, obtains user's request from server
Content.
If the number of user's request cannot be all found in the transfer point of transmission point set, macro base station and macro base station management
According to the request of user can be sent to server by core net by macro base station, provide the content of user's request by server.When grand
After base station obtains the content of user's request, if channel status meets requires rate requirement T, directly can be passed for user by macro base station
Defeated, otherwise content is transmitted to service TP by macro base station, is transmitted for user by service TP.
Beneficial effect
Present disclosure transfer mechanism can make full use of the cooperation feature in user-center network between website, pass through
Search in the website of transmission point set, macro base station and macro base station management, expand the scope of content search, while in transmission
When consider between website and user Link State, selection meets the website of rate requirement and is transmitted, therefore is improving Cache lives
Radio interface rate is taken into account while middle rate, time delay and backhaul pressure have been reduced while guaranteed rate.
Description of the drawings
Fig. 1 is the user-center network model figure disposed based on Cache of the present invention；
Fig. 2 is the algorithm implementing procedure figure of the present invention；
Fig. 3 is the Cache coverage rates emulation schematic diagram of the present invention；
Specific embodiment
Case study on implementation of the present invention combines accompanying drawing and elaborates.
Example 1 is the content transport mechanism under the user-center network disposed based on Cache of the present invention, and accompanying drawing 1 is
The system architecture and scene of practical application.In the user-center network of website dense deployment, network is that user builds transmission
Point set, red TP represent service TP, and blue TP represents synchronization TP, deploys Cache, each TP on macro base station and each TP
It is connected with macro base station by backhaul links, macro base station passes through gateway accessing core net.
Network is divided into two-layer by us.Ground floor is that macro base station obtains data for providing covering from core net.Data from
After core net is via gateway, macro base station is pushed to by optical fiber link.The second layer is made up of TP, grand from last layer by back haul link
Base station obtains data, for improving the covering of network, realizes disposing without planning for transmission node, further improves the appearance of network
Amount.
The mechanism of this programme is realized being performed by service TP, and its brief flow process is as shown in Figure 2.User is by a certain content
Request is sent to service TP.If service TP do not store the content, by by service TP by the interaction with synchronous TP, macro base station
Cooperation is solved.
Here, service TP to store when no in the Cache of service TP with the interactive cooperation major embodiment of synchronous TP, macro base station
During the content of user's request, user's request is forwarded by service TP, expands the search area of content.In synchronous TP, macro base station cannot
Directly it is connected with user when carrying out data transmission, the content that user's request is obtained from synchronous TP or macro base station by service TP is completed
Data transfer.
The step of user-center Web content transfer mechanism：
Step 300, network are that user builds transmission point set, it is determined that service TP and synchronization TP.
Request to a certain content is sent to service TP by step 310, user, and service TP is searched whether in Cache
Store the content.If the content is present and speed meets requirement, service TP is directly that user is transmitted.Will if speed is unsatisfactory for
Ask, more new demand servicing TP, content is forwarded to new service TP by former service TP, is transmitted for user by new demand servicing TP.
Step 320, if the content of user's request is not stored in service TP, user's request is sent to transmission by service TP
Synchronous TP in point set.
Step 330, after synchronous TP receives the user's request of service TP forwardings, searches with the presence or absence of the content in Cache.
If the content is present, and synchronization Link State satisfaction requirement between TP and user, synchronous TP is that user is transmitted, and is otherwise transmitted to service
TP, is transmitted for user by service TP.
Step 340, if the content of user's request is not stored in synchronization TP, replys service TP and searches failure, service TP
The request of user is transmitted to into macro base station.Macro base station is searched in Cache, if the content presence of request, its macro base station and use
Between family, link meets and requires, macro base station is directly transmitted for user；Otherwise, content is transmitted to service TP by macro base station, by service TP
Transmit for user.
Step 350, if without the content is stored in macro base station, macro base station is transmitted to user's request in its range of management
Transfer point, each transfer point searched in Cache.If the content of request is present, macro base station is forwarded it to.If grand base
It can be user service to stand, and macro base station is directly set up with user and is connected transmission data；Otherwise, reply macro base station and search failure, it is grand
Base station forwards the data to service TP, is transmitted for user by service TP.
Step 360, if the transfer point in macro base station range of management does not store user's request content, macro base station will be asked
Sent to server by core net, the content of user's request is obtained from server.If macro base station can be user service, grand
Base station is directly set up with user and is connected transmission data；Otherwise, macro base station forwards the data to service TP, is passed for user by service TP
It is defeated.
Simulation result is as shown in Figure 3.Accompanying drawing 3 is the emulation schematic diagram of Cache coverage rates.Cache coverage rates are represented
Meet the Cache hit rates under the transfer rate for requiring, i.e. the hit rate of the coverage rate and Cache of user-center network is common
Determine Cache coverage rates.Abscissa represents the size of Cache.The simulation result gives and is passing under different rates requirement
The contrast of the coverage rate of locating file and super-intensive network in defeated point set.Since in the deployment of actual cache, Yong Hutong
Crossing the cache in transmission point set or service small station, to search and obtain the expenses such as time for being brought of file will be far smaller than user
The website managed using macro base station and macro base station scans for and obtains content, therefore mainly considers the lookup of transmission point set
Process.Can be seen that by simulation result, under identical Cache size, compared to super-intensive network, user-center network can be real
The significant increase of existing Cache coverage rates.
Claims (8)
1. it is a kind of based on Cache dispose content transfer method, it is characterised in that include：Content requests are sent to biography by user
Service TP in defeated point set；Service TP locating files in Cache, it is determined whether can be user service；If content is not present,
Content requests are forwarded to into synchronous TP then, it can be user service to be searched in Cache and determined whether by synchronous TP；If synchronization TP
In do not store the content yet, reply service TP and search failure, service TP forwards a request to macro base station；Macro base station is in Cache
Search and determine whether as user service；If macro base station does not store the content, forward a request in macro base station range of management
TP, each TP searched in Cache, and macro base station is transmitted to if finding, and determines whether to be directly user service by macro base station；
If not finding, macro base station will ask to be sent to server by core net, obtain the content of user's request, true by macro base station afterwards
It is fixed whether directly to transmit for user；If macro base station directly cannot be transmitted for user, service TP is transmitted to, is user by service TP
Transmission.
2. method according to claim 1, it is characterised in that service TP searches text in Cache after receiving user's request
Part, and determine whether for user service, also to include：Whether file finds, and whether transfer rate meets business need.
3. method according to claim 1 and 2, it is characterised in that service TP determines whether to store the interior of user's request
Hold.If the content of the user's request that is stored with the Cache of service TP, service TP are needed according to current channel condition, judge to pass
Can defeated speed meet business demand.
4. the method according to claim 1 and 3, it is characterised in that if not storing the interior of user's request in service TP
Hold, servicing TP needs for the request of user to be transmitted to the synchronous TP in transmission point set.
If transfer rate cannot meet business demand, transmission point set is needed for user's more new demand servicing TP.
5. it is a kind of based on Cache dispose content transfer method, it is characterised in that include：Need when service TP does not store user
During the content asked, successively to synchronous TP, macro base station forwards the content requests of user to service TP, and according to channel status, is defined as
User provides the website of transmission.
6. method according to claim 5, it is characterised in that the content of user's request if synchronization TP is stored with, and energy
Enough meet service transmission rate requirement, synchronous TP is updated to service TP, is user service；If speed is unsatisfactory for requiring, will be interior
Appearance is transmitted to service TP, is transmitted for user by service TP.If user's request content is not stored in synchronization TP, TP is serviced by user
Request is transmitted to macro base station, determines the need for obtaining data from server by macro base station.
7. method according to claim 6, it is characterised in that macro base station is searched in Cache, if finding and channel shape
State meets condition, is directly transmitted for user by macro base station；If channel condition is unsatisfactory for, service TP is transmitted to, is use by service TP
Transmit at family.The TP of macro base station management if not finding, is forwarded a request to, if the TP finds, content grand base is transmitted to into
Stand, by macro base station according to channel condition, it is determined whether be directly user service；If the TP does not find, macro base station passes through core
Heart net obtains the content of user's request from server, determines the website of transmission further according to channel status.
8. method according to claim 7, it is characterised in that if the channel condition between macro base station and user is preferably, can expire
Sufficient service rate is required, is user service by macro base station；If speed cannot meet requirement, content is transmitted to service by macro base station
TP, is user service by service TP.
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| CN201611123639.4A CN106535231B (en) | 2016-12-08 | 2016-12-08 | Content transmission method for 5G user-oriented central network Cache deployment |
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| CN201611123639.4A CN106535231B (en) | 2016-12-08 | 2016-12-08 | Content transmission method for 5G user-oriented central network Cache deployment |
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| CN108174395A (en) * | 2018-01-15 | 2018-06-15 | 南京邮电大学 | Node B cache management method and system based on transfer action assessment learning framework |
| WO2022052521A1 (en) * | 2020-09-14 | 2022-03-17 | 华为技术有限公司 | Communication method and apparatus |
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| CN106535231B (en) | 2019-12-13 |
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